WMG / The Flash (2014)

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    Pre-premiere theories 
John Wesley Shipp is Jay Garrick
It's only obvious that the previous Flash actor would be cast as the Golden Age Flash (though he doesn't have to be a speedster in this 'verse).
  • If that happens, then they should also cast Lynda Carter as Queen Hippolyta in Amazon. (They are still making that, right?)
  • Jossed: He's Barry's father, Henry.
    • Aaaaand now confirmed, with a vengeance!

Digger Harkness (Captain Boomerang) will appear
As Boomerang is a perennial member of the Suicide Squad, it's clear he'll get a role eventually.
  • Confirmed, sort of. He's appeared in Arrow, not Flash.

The bolt of lightning wasn't lightning at all
It was a manifestation of the Speed Force. Hence why Oliver said that it "chose" Barry.

The show will keep the New 52 power set of The Rogues
We already have shots of the Weather Wizard having genetic powers rather than a magic stick. It's more than likely they'll keep some more of those genetic powers in the show from the particle accelerator explosion. I can already see them keeping Captain Cold having freeze powers rather than a zero temperature gun as there's a comic precedence for that.
  • Jossed - At least for Captain Cold and Heatwave since in 'Going Rogue' we see them get their respective guns. Though that might change later on in the series should the writers decide to make them metas.
  • Confirmed for Mirror Master and Top.

Season 1 Plots
Guesses here for story lines in the new show.
  • Barry has his first encounter with Professor Zoom.
  • Barry endearing himself to the police, going the opposite direction from Arrow in having Barry be a pal of the department rather than an irritation.
    • The police do seem to like the guy
  • The rise of The Rogues: As Barry continues to take on a Monster of the Week, slowly but surely, they start banding together to deal with the flash. The end of the season will be about them breaking out of prison, saying that they'll stick together in order to stand a chance against their scarlet speedster enemy.
    • Close. In the last few episodes of the season, Captain Cold lets the Metas escape, under the agreement that they owe him one. We've already seen one team-up (Cold/Trickster/Weather Wizard) in season 2, and that will probably lead to the full Rogues
  • Probably not a first season plot, but still possible: A "Flash of Two Worlds" story arc with Michael Rosenbaum as Jay Garrick.
    • Michael Rosenbaum as Johnny Quick, in reference to his role as the voice of the Flash and as a certain well known bald villain who has a problem with red and blue clad aliens.
      • Jay Garrick confirmed, Rosemeister, not so much.
      • However, Jessie Quick appears as Harry's daughter, and Haryy creates "Velocity-6", so maybe he's Johnny Quick?

There will be a Running Gag in which Apple devices don't work for Barry.
Because Apple doesn't support Flash.

The explosion of the particle accelerator was not an accident.
It was Professor Zoom traveling back in time to manipulate events so that he gets powers.
  • [[spoilers: Confirmed... partially. The particle accelerator explosion was originally an accident, but in the original timeline happens 20 years later. Thawne/Zoom traveled back in time, got stuck, and sped up the process so he could try to return home.]]
    • Exception being he was never known as Zoom until Earth 2 premiered in Season 2.

Flash is especially vulnerable to certain diseases and poisons.
His powers speed up his body's physical healing but also speeds up the spread of viruses or poisons in his body.
  • He is immune to most alcohols.

Captain Cold and Golden Glider will be introduced as a Brother–Sister Team.
Ties in with the idea that Captain Cold will be a meta, so will Golden Glider.
  • What exactly would her powers be then?
  • Super-agility, some kind of punch-dodging "aversion field"? Hopefully not "ghost" or "owns rocket-skates", anyway.
  • Jossed - When we meet Captain Cold he mentions his sister but we don't meet her and he is the leader of a criminal crew (not the Rogues) and at the end the first person he goes to form the Rogues is Mick Rory (Heatwave), and neither of them are metas.
    • unJossed? Captain Cold and his sister Lisa do function as a team of sorts in several episodes, staring in "Rogue Time." Cisco is forced to make Cold's sister a gold gun in "Rogue Time," and he gives her her nickname in "Rogue Air." They still aren't Metas though.

The color change in Flash's costume will be lampshaded
He'll still get his nickname of the "scarlet speedster", only for Flash to point out "technically, it's more of a maroon". It'll still stick.

There will be a Smallville tribute episode in which Barry Allen will meet Clark Kent
In Smallville, the reverse happened, with a young Superman meeting an even younger Flash. It would be poetic for them to do a parallel episode, with an older Flash meeting a new-to-the-job Superman, who is covering a news report on metahuman crime for a newspaper in Metropolis. One of them will probably lampshade this with something like "Haven't we met before in the past or something?".
  • And, in the grand tradition of Superman/Flash crossovers, they'll race around the world for charity!

The particle accelerator's creation of metahumans around Central City will be similar to the "Big Bang"
The usage of the word "metahuman", coupled by the fact that the particle accelerator explosion looks to be the source of where the show's enemies will come from, shows clear resemblances to the series. To add to this, one of Barry's scientific allies could be none other than Virgil Hawkins, and some of the metahuman rogues he faces may be from Static's rogues gallery (Hey, if they give Batman rogues to Arrow, then why not?).
  • The part about the accelerator being the source of the shows enemies is confirmed. Though there's no indication so far that anyone from Static will appear.

At least, the future Justice League film will use Gustin and Amell as alternate universe versions of their characters
With new costumes.

This and Arrow will not be in the same universe as Man of Steel and Batman v. Superman
  • Confirmed.

...But there will be a Multiverse episode or story arc down the line
Perhaps including every live-action DC thing legally possible to include. The Flash being the one to discover it would be a natural Mythology Gag to "Flash of Two Worlds".
  • Geoff Johns mentioned a possibility of a Multiverse to describe the TV shows and the films so it's likely that by the time the show renewed for a 4th or 5th season, the DCCU Justice League film and The Flash 2018 film will be out. By then, Gustin!Flash and DCCU!Flash will meet and either one of them would say (as quoted from the comicbook), "So you see, I became the super-fast Flash on my Earth much as you became The Flash on yours!" And there's plenty of time before 2024 Crisis. As theory below says, the sky's the limit!
  • It's confirmed that they're using the Multiverse for the show, but I doubt they'll include the movies in that

Eddie Thawne is from the Future
He is Professor Zoom and hates Barry, and traveled back in time to ruin his life, first by killing his mother and then by stealing his wife.
  • Jossed. That role belongs to Eobard Thawne, a descendent of Eddie Thawne, but he didn't steal his wife.

Harrison Wells is Professor Zoom
Eddie Thawne is a Red Herring, and Wells is the actual villain.
  • Confirmed. A descendant of Eddie Thawne, Eobard Thawne, traveled back from the future and took over Harrison Wells' body.
    • Moreso in Season 2, though whether he's the same person as in Season 1 is in question.

Eddie Thawne is an ancestor of Eobard Thawne
Eddie isn't Professor Zoom, but his descendant is
  • Eobard killed Barry's mom as revenge for what he did (or what he'll do) to his ancestor and ruining the Thawne family. But all he did is create a Predestination Paradox.
    • Part of this is confirmed. Eobard is Reverse-Flash and Eddie is his ancestor. Eobard wasn't trying to kill Nora, though, he was trying to kill little Barry; Flash traveled to the same point and time, though, and wouldn't let him do it, and Nora was just the next best thing.

Harrison Wells is Don Allen
Barry's son from the Future, traveling back in time to save his father and the future
  • Jossed.

Harrison Wells is Jay Garrick, the original Flash
His powers slow down his aging; the years of retirement have made people forget he existed
  • Jossed.

Harrison Wells is Impulse
He's gonna be an Adaptation Distillation/reinterpretation of the character. He travels back in time to save his grandad.
  • Jossed.

Caitlin will eventually become Killer Frost and turn against Barry.
Whether or not it's a case of With Great Power Comes Great Insanity or a genuine Face–Heel Turn, she will eventually gain her own powers and fight against Barry like the Slade/Oliver relationship in Arrow season 2. There will be one or more tear jerking moments involved.
  • Killer Frost might be a Super-Powered Evil Side she gains after exposure to Captain Cold's powers.
    • With Ronnie's disappearance, Cait has ample reason to subconsciously hate Barry.

The Flash will get new costumes periodically
Because each costume suffers from wear and tear and because Cisco and Caitlin constantly improve on the design on the initial costume in order to improve on both the durability and the streamlining.
  • Confirmed, Arrow too.
  • Well, semi-confirmed. The changes in design were just because they found Wells' newspaper. Which is incredibly lazy if you ask this troper.

In spite of Geoff Johns comments, this and Arrow will be in the DC Cinematic Universe.
Because what better way to build up anticipation for the shared universe than to not reveal it until prior to the films?
  • This troper is thinking Crisis Crossover, because it's such a DC staple that it wouldn't be extreme to see them attempt it among all of their on-going live-action properties.
    • But they already cast another Deadshot, Halrey Quinn, Captain Boomerang, and Barry Allen for the movies

Dinah Lance will appear at some point.
Incredibly out there prediction but she was said to be teaching at Central City university at some point in Arrow.
  • Depending on what Wally's age will be, she could be a representative that comes to his high school to hand out pamphlets during an assembly.

    Future storylines/episodes 
Iris will find out her dad and Barry are hiding something.
  • Confirmed.

There'll be a Bad Future episode.

There'll be an episode where he finds himself in a Mirror Universe.
His Evil Counterpart will be Johnny Quick.
  • Or possibly Jay Garrick, as a reference to the "Flash of Two Worlds" story.
    • Nooo, Jay is good.
      • Jossed as of Season 2 Jay Garrick's a superhero
  • An Evil Counterpart of Arrow will be mentioned. He'll be called the Archer or something.
  • His trip to the Mirror Universe will be caused by Mirror Master.

Barry will travel to the future
Where he will meet Wally West/Bart Allen/Jay Garrick, and will learn of the legacy he inspires, but will also learn about the Reverse-Flash legacy, and will wrestle with the idea of killing Reverse-Flash before he becomes evil, or try to make him a better person and inadvertently begin their rivalry.
  • He's already met his Wally West, and Earth-2!Jay

Barry will tell Iris a half-truth as his "secret" at some point
He'll tell her about having frequent hypoglycaemia (perhaps saying it's because of hyperinsulinism), and she'll be mad about him not telling her sooner but, at least for awhile, she'll think she knows what he's been keeping from her.
  • Jossed. She knows now.

In the Red Sky Crisis of 2024, copious use of Time Travel, both by Professor Zoom and The Flash, will tear the dimensional fabric enough for a certain being from the Anti-Matter universe to emerge...

Barry will eventually start traveling to the parallel earths
We will definitely see some kind of adaptation of the 'Flash of Two Worlds' story...with Jay Garrick as Flash. Also, Barry could possibly visit other DC TV and Film universes. So we could have a story where he meets the Flash of the DCCU (played by Ezra Miller). Or a story where he visits the Nolanverse (with Joseph Gordon Levitt guest-starring as Batman). Or the Smallville universe. The sky is the limit really!
  • Confirmed. All of Season 2.

Barry and Ollie will switch cities for an episode or two
It's already known the shows are connected, but there'll be episodes on both shows where Oliver tracks down someone to Central City and has Cisco, Caitlyn and Wells on his team while Barry has Diggle, Felicia and Roy, and maybe Laurel if she takes enough levels in badass.
  • Laurel does join Team Arrow, and Roy gets replaced by Thea. However, it looks like the crossover episodes will have both teams working together.

There will be a second Particle Accelerator explosion in order to empower more characters
Either at the end of the first season or the second season, but there will be another explosion, resulting in a number of people, possibly including Cisco, Caitlin, Wally, Eddie, and a few others gaining their own powers, along with revealing this stuff to the public completely.
  • Cisco is already developing powers, Eddie's dead... probably some other kind of event (maybe magical) will trigger metahuman anomalies.

Working with the other Rogues will make Capt. Cold take a level in kindness
Being around his new friends will get him to defrost.
  • Barry does believe there's some good in him and it's true he's Not Always Evil.
  • He's a her oin Legends of Tomorrow.

Edward Thawne will die by the end of Season 1
In some respects, it seems like The Flash is following the same broad pattern as Arrow. Edward Thawne to my mind appears to be an Expy of Tommy Merlyn's. Both Edward and Tommy share last names with familiar villains, and both are dating the hero's canonical love interests. Tommy Merlyn was a kind of Red Herring in early episodes of Arrow until we find out that he's not the villainous archer 'Merlyn' - his father is. I think its going to be the same with Edward Thawne. He's not the Reverse-Flash - Harrison Wells is.

Moreover, Eddie will actually turn out to be a nice guy, like Tommy, and a friend to Barry and possible ally of the Flash. And in the season finale, he will get killed somehow by the Reverse-Flash's actions, while helping Barry. Iris will be grief-stricken by his death, and this may lead to her and Barry getting closer and possibly starting their own relationship.

Now Thawne's death could potentially cause a paradox if he's Eobard Thawne's ancestor...or it might simply 'untether' Eobard from the time-stream and allow him to continue to exist as a time anomaly, as he eventually did in the comics. Maybe the fact that he's no longer bound by the natural laws of time and space is what leads him to mess around with the past further, creating the Flashpoint reality.
  • Confirmed. Eddie kills himself in a last-minute Heroic Sacrifice, (presumably) erasing Eobard Thawne from history. Of course, who knows if this will actually keep him dead. However, in spite of erasing Eobard, his actions of changing the past are still intact.

When Firestorm shows up, he'll reveal Harrison Wells' secrets.
Ronnie is completely aware of everything that happens in STAR Labs while he's a disembodied consciousness.
  • Jossed.

Plastique survived her explosion.
While she seemed to die of mundane wounds, she is a metahuman, and traditional member of the Suicide Squad. Her body will be recovered & revived by Amanda Waller and she'll replace Shrapnel on the Squad.

The show will adapt the "Flash of Two Worlds" story.
It's a no brainer, considering it's one of the most iconic Silver Age stories involving the Flash. And which world will he go to?
  • The world of the 1990 series, complete with John Wesley Shipp reprising his role as that show's Flash & an Actor Allusion to his playing Henry Allen in the 2014 series, with 1990!Barry receiving a confused "Dad?!" from 2014!Barry.
    • Jossed. It has Earth-2 and Jay Garrick.
  • The world of Smallville, with Kyle Gallner reprising his role of Impulse. On top of that, thanks to the shared universe, Justin Hartley will reprise his role of Ollie Queen/Green Arrow to contrast with Amell's Arrow, and Tom Welling would make a brief cameo as either as Superman or Clark Kent.
    • Jossed again. See above

Multiplex will return
With the death of the main body,t he consciousness controlling all bodies probably just jumped into another one. Alternatively, someone at STAR will regrow Danton Black-prime accidentally (Cisco/Caitlin) or deliberately (Wells).

The season will end with another, larger, Phlebotinum explosion
Leading to other characters becoming metahumans, including those not in Central City. Caitlin will get her ice powers, Laurel will get her canary cry, Ray Palmer will get his size shifting, etc. It could also revive Cyrus Gold as Solomon Grundy.
  • The Canary Cry and the Atom powers are both tech in this universe

Joe West will die when he learns the truth behind Nora Allen's murder
Joe has a death flag above him when Reverse-Flash warned him to stop the investigation by threatening Iris' life. At some point, Joe would still continue the case and might die protecting Iris from Zoom. His death would affect not only Iris but also Barry, who might blame himself for not saving him on time and do a 10-Minute Retirement from being the Flash and Thawne, who would become obsessed his case, might blame the Flash for failing to save Joe and later, become Barry's worst enemy.
  • Jossed. Joe West learned the truth but is still alive.

The CW-verse heroes will form the Justice Society rather than the Justice League
Without the use of Superman and Batman, and the mention of Golden Age characters in "Power Outage", they will form the Justice Society to take on the Rogues Gallery.
  • I heard that the upcoming Supergirl series will crossover with this show and Arrow. But since Superman and Batman are in embargo, it's likely that this Supergirl would be her Earth-2 version, who is a member of the Justice Society. But she's still called Supergirl because, according to the synopsis, she's raised by the Danvers.
    • Supergirl will not crossover with the CW shows. They'll exist in the same universe so it's possible the heroes will be mentioned in each others respective shows. But Supergirl will not appear in Flash or Arrow and those two will not pop up in Supergirl, no matter how much they'd like to.
      • You've got that the other way around. Supergirl does not exist in the C Wverse, but she and Flash will have a crossover.

Firestorm will pull a Big Damn Heroes during Flash's first encounter with Reverse Flash
Possibly because in the original timeline, Ronnie's Powers just consumed him and he never became firestorm, but somehow due to the time travel interventions of Wells, Ronnie is able to survive a bit longer and therefore help Barry. Reverse Flash wouldn't know how to deal with him because he never encountered him in the future.
  • Technically, Firestorm didn't show up until Barry's second encounter with Reverse Flash, but it was in the same episode as the first so the above still mostly counts as an accurate guess.

Barry will help Ollie during his missing five year gap.
Thanks to time travel, Barry will help Ollie while he's on the Island/Hong Kong/wherever, and possibly tell Ollie to give him an inspiring speech when he comes out of a coma. That's why Ollie is so unfazed by metahuman shenanigans, since he already knows it's going to happen and seen it first hand.

Jay Garrick will become Barry's mentor after Barry finds out about Harrison's schemes
and finds out that Harrison created the Flash on purpose.
  • Jossed. Instead, Jay leaves when they get HIS Harrison Wells

Eddie will become Dark Flash using the Cobalt Blue power source

Barry will eventually discover that he can travel through time and build the Cosmic Treadmill to stop Zoom from killing mom
But.....it will create For Want of a Nail scenario where:
  • A) If he succeeds in stopping Zoom, it will create a Time Crash similar to Flashpoint or something else.
  • B) If he doesn't succeed in stopping Zoom, it might open a dimensional rift and reveal the existence of the Multiverse and the Anti-Matter universe which could explain the 2024 Crisis.
  • Confirmed. Barry discovers he can travel through time - with help from Professor Zoom/Thawne - in "Fast Enough," the final episode of season 1. However, neither A or B happens - or at least if they did we don't know about it yet.
    • Multiverse confirmed.

There will be an adaptation of Flashpoint
They can't use Batman, so he will be replaced with the Arrow. In the alternate universe, Oliver died in the shipwreck and Robert Queen became the Arrow. After finding out his wife re-married and worked with Malcolm Merlyn on a device that destroyed the Glades, he becomes a violent anti-hero. He would kill Merlyn, and Moira would end up becoming that universe's version of the Dark Archer, much like how Martha Wayne became the Joker.
  • Alternatively, in the Flashpoint timeline, Ivo killed both Oliver and Shado on the island. This prompted Slade and Sara to become Starling City's protectors to honor their memory. Slade still received the Mirakuru however, and the darker tendencies caused by it drove Sara away and leave him an angry, violent, shell of himself by the time Barry arrives in the new timeline.
  • Additionally, Atom and Firestorm can fulfill the roles Cyborg and Superman had in the original story, respectively.
    • Ooh! Atom becomes CYBORG!

There will be a Flash/Supergirl crossover...
Which will involve them running a race to see who's fastest.
  • Confirmed on the crossover, not about the race yet.

Flash will propose going after Ra's al Ghul to avenge Oliver's apparent death
Harrison will prevent him from doing so to show that Ghul is so badass that even the Reverse-Flash is afraid of him.
  • More likely Ghul plays some important roles in the future/Flash didn't kill Ghul. Remember He's trying to maintain the future and Ghul's a major piece to remove from the game.

The Flashpoint Paradox
It's obvious they are building towards that at this point, it's just a question of how many seasons out. But when they pull the trigger that causes New 52 in the comics it will cause something similar in the combine Flash, Arrow and any other shows that exist in the shared universe at the time and will be used as an excuse to recast anybody who for any reason wants to be replaced and bring back from the dead anybody they deeply regret killing off again with a new actor if need be.
  • The Season Finale seems to be building toward this, as previews indicate that Barry will attempt to go into the past to save his mother. This could easily lead to Season 2 being a Flashpoint adaptation, with Barry attempting to fix the timeline after he messed it up by saving his mom.

There will be super-powered children soon
Nine months is the exact length of human pregnancy. In a few months, when it's at least a year after the explosion, we might find out about children who are displaying unique abilities. These abilities would be due to being exposed to the energy while still in the womb.

When Pied Piper returns, he'll have had an upgrade
A new addition to his arsenal: devices that use sound to mesmerize people. Like his namesake.
  • Ideally, those devices will be in the form of a musical pipe, or at least are disguised to look like such, with him making a comment along the lines of 'Why do you think I called myself the Pied Piper!?' when he reveals it.

When Pied Piper returns, it'll will be because of Cisco
Perhaps as per above he'll use his abilities to mesmerize Team Flash but it backfires and activates Cisco's metahuman abilities. Clearly he's being set up to be Cisco's Reverse Flash/Captain Cold, this could be the catalyst for their rivalry going to the next level.
  • Or Hartley had a thing for Cisco. The twist being that Cisco had a thing for him right back but because he was a giant jerkass it put Cisco off.
    • Doubt anyone could have a thing for Hartley. And Hartley very obviously only had a thing for Wells.

Wells is building a second accelerator in secret, which will activate in the season finale.
When Iris asks him during the press conference in "Sound and Fury" if he's planning on rebuilding the accelerator, there's an ominous pause before he denies it. Meanwhile, we know he's working with Grodd, whose first appearance has the sewer workers commenting that there have been power fluctuations in the area. My bet is that Wells and Grodd are building an accelerator in the Absurdly Spacious Sewer underneath Central City, using slave labor in the form of people Grodd is abducting and brainwashing. In the season finale, Wells will activate it in an attempt to use it to stabilize his connection to the Speed Force. As a side effect, there will be another Mass Empowering Event, and perhaps it will even be this event that causes Wells and Barry to be sent back in time to the night Nora Allen was murdered.
  • Confirmed

"Out of Time" will take place on Saint Patrick's Day.
That is the day on which it is airing. Maybe The Flash will meet with Arrow to get a green outfit in case he is unable to outrun the pinches.
  • Jossed. Episode had nothing to do with St. Patrick's Day in-universe.

Cisco will build Laurel a "Canary Cry" weapon.
Laurel is appearing in an episode and is shown to be speaking with Cisco himself in the Paleyfest promo for the shows remaining episodes of the season. As it is unlikely Laurel will actually become a metahuman with that type of ability and even more unlikely that she gained the ability somehow from the Particle Accelerator and has been hiding it this entire time, Cisco will use his technical skills to create her something that will enable her screams to be made extremely loud, at glass-shattering levels even.
  • Confirmed as of "Who Is Harrison Wells?"

The Rogues will end up in an Enemy Mine against Reverse Flash or Grodd
Not out of any charity mind you, and certainly not out of affection for the flash, since this captain cold is a much more directly ruthless villain by comparison. Rather, it's a kind of Pragmatic Villainy. Cold did talk about how with their weapons, only the flash could stop them from becoming the masters of central city. However, if the Flash is out of commission and Central City is taken over by another speedster or gorillas, then how are they supposed to be kingpins of the city? They'll let Flash know, "You get off lucky today, but once this is over, you're dead Flash."

Every episode featuring the Rogues will use the word Rogue in the title somewhere, and similarly, will introduce a new member of the rogues each time with gradual Sequel Escalation
Pretty self-explanatory. The first episode with a rogue was Going Rogue, with just their leader Captain Cold. 2nd was Revenge of the Rogues, and that introduced Heat Wave. Then following that, we'll get a new person joining the rogues each time, with their plans becoming slowly more elaborate as more members progressively join their "family". They could even have some of the other villains who didn't start as part of Cold's team gradually join up, whether it be Weather Wizard, Pied Piper or Cold's sister Golden Glider.
  • Rogue Time, Rogue Air, Family of Rogues... seems confirmed so far.

The Red Sky Crisis wipes out the universe
Or would have without the intervention of Future!Flash. This is why Wells/Eobard Thawne freaks out in "Power Outage" when his records show that the Crisis is continuing and there's no mention of The Flash. While he needs The Flash to get him home, he has no reason to care about whether or not the Crisis is stopped...unless, that is, the Crisis wipes out the universe. His line about how Cisco has "been dead for centuries" from his perspective implies he's from much farther in the future than 2024, yet he focuses his archives almost exclusively on that year and particularly on the Red Sky Crisis. This is because he wants to make sure that the universe sticks around long enough that the time period he's trying to return to actually exists.

Every six episodes will feature the Rogues
So far Cold debuted in episode 4, "Going Rogue." He returned with Heatwave in episode 10, "Revenge of the Rogues." And episode 16 features those two plus Golden Glider (and Weather Wizard, in a carry over from "Out of Time") in a story called "Rogue Time." So, they'll likely reappear in the penultimate episode of the season, and then repeat the cycle of appearances next season as well.
  • Well, Rogue Air was the sixth episode after Rogue Time, but Family of Rogues in Season 2 is the third episode in.

The timeline will be drastically changed in the Season finale
Given the fact that Barry's mom evidently wasn't meant to die that night without the Reverse-Flash (a time traveller) attacking, and Barry now vowing to stop this happening, its likely the season finale will actually include that. However, while most assume he'll fail, what if he succeeds? Well, without the Reverse-Flash's alterations, the world would change to something remarkably different, firstly the presence of Barry's parents in his life, as well as the West family being different due to not having Barry fostered into it; Hartley's life would also be different, due to not having Wells as a poisonous influence, while both Caitlin and Cisco would probably have done different things than become part of Team Flash. While this could lead to something of a Flashpoint situation where Barry has to go back in time to fix it, its entirely possible they might, instead, forgo that idea and instead have Barry try to adapt to the new/original timeline. He could end up having to re-recruit Cisco and Caitlin, build a different relationship with the West family (as well as befriend Wally West), or even start parts of his life from scratch. There's still some things which can be similar, such as his relationship with Team Arrow and so on, but besides that, it could make for a big Status Quo shake-up.
  • Doesn't happen - but primarily because Barry realizes all of this in the season finale. He realizes that saving his mom would change the timeline, and potentially him and everyone around him, significantly. His future self also signals to him not to do it - and so even though he has the opportunity to, he doesn't save his mom, and so far there haven't been significant changes to the timeline.
    • And yet, somehow, Eddy killing himself, preventing the existence of Eobard, miraculously doesn't effect the time-traveling exploits and mentorship of Harrison Wells to Barry. Seriously, they shouldn't remember anything that happened up to that point.

The three CBS actors (Allen/Shipps, Trickster/Hamill, McGee/Pays) on the CW Flash are from the CBS Timeline... and are aware of that fact.
The Trickster Episode trailer makes frequent reference to what happened "20 years ago" and in fact uses CBS props, images, etc. It also implies that Hamill's Trickster has a grudge against John Wesley Shipp's Allen. Tina McGee was also surprisingly negative about Harrison Wells and was one of the first people to accuse him of sabotage and corrupting Barry. Shipps too picked up on Barry being Flash really easily for a TV show story. Trickster's episode comes right after introducing alternate timelines.


Because these aren't references to their CBS characters. They ARE the CBS characters. At some point after the CBS show ended, Shipps!Flash, Trickster, and McGee were together when something (probably Barry-related) pushed the three into an alternate timeline. It also stripped Barry of his powers, similar to what happened with Harrison Wells. The three went their separate ways, Barry took over Henry's identity (depending on how old Barry is, he may have either married Barry's mom after she had him), Tina McGee went back into science and Trickster used the bombs to either lure the Flash out of hiding or as a way to get back to his timeline. Trickster was captured. Nora died and "Henry" was arrested and Tina just stayed out of it for now.

But history is repeating and they are all aware of it. Tina's coming back in a future episode and it would explain why out of every criminal in the prison... Trickster returns to kidnap Henry Allen.
  • Post episode: HOW did Trickster know Henry Allen was Barry's dad? I don't think Barry mentioned his father was in jail. Or where he was. And then when Trickster talked about how it was a really great trick, he was talking to Henry, not Axel. (Check the eyelines)
    • Also, there were flashbacks in this episode. Flash usually doesn't use Flashbacks. And these dealt entirely with altering timelines, alternate timelines, and identity theft.
  • Adding to this, the second Trickster's mother is this timeline's version of Zoey Clark. Or...
  • Recently, Henry left the city after being exonerated of his wife's murder. Seems odd to say the least.
  • Barry jumping through to Earth 2 showed 90's flash there, so it exists in some form. But as it showed some tings that happened yet the portal controls both time and space. So 90's existed, but who knows about now.
  • Henry said his mother's maiden name was Garrick. 90's Flash had Garricks and Allens related.

This series is a Stealth Sequel Series to the CBS show.
Barry's dad WAS the Flash, and his full name was Bartholomew Henry Allen, he dropped the name Barry later on. Paula Marshall!Iris West came back and she and Shipps!Barry got back together. Marshall!Iris found out Shipps!Barry is the Flash, and two eventually got married. She too changed her name to Nora. Similar to the theory above, something happened which caused Shipps!Barry to lose his powers and decided to focus on his job, eventually becoming a respectable doctor. Tina and Real!Harrison were colleagues, until Eobard replaced Harrison and pushed her away.

In the season one finale Eobard Thawne will finally be defeated by his ancestor Eddie committing a Heroic Suicide, thus erasing Eobard from existence.
It would allow an emotional finale, and also a way to gracefully get Eddie out of the picture so that the writers can ultimately tie together Iris and Barry.
  • Confirmed. I was indeed correct. :)

Wells and Eobard Thawne will be separated by the end of the season, somehow restoring Dr. Wells to life.
It has already been confirmed that Matt Letscher will reprise his role in the future. We will see that all the Pet the Dog moments we have seen from Harrison Wells/Eobard Thawne so far have entirely been Wells' personality coming through, and that the true, undiluted Eobard Thawne is pure evil, much like in the comics.
  • Didn't happen by the end of the season; however, that doesn't preclude Wells from showing up sometime in the future.
    • The actor makes a return in Season 2 as Earth 2's Harrison Wells

The Rogues will form and be instrumental in stopping Grodd and Eobard Thawne.
Since Thawne has been so very careful in manipulating things, he's completely missed the Spanner in the Works of a bunch of crooks who aren't locked up or working with him.
  • In the comics those two are among the few to not be counted among the Rogues so this could be possible
    • Jossed. The rogues had nothing to do with Thawne's defeat. Grodd's still out there though.

James Jesse was lying about being Axel's father.
Manipulating and destroying some poor kid's life was the "perfect trick" he was talking about.

When told of the super villain name that Cisco came up with for her, Brie Larvan will instead decide to call herself Queen Bee
Because she's not really a bandit, I think she would take offense of being referred to as "bug-eyed" and she called herself "Queen of the hive".

a Wells is deliberately creating metahumans for an army.
As the ending of "Broken Arrow" shows, Deathbolt was a metahuman despite not being anywhere near Central City when the particle accelerator exploded. Wells is creating a metahuman army which will likely be the enemy for the team-up between Flash, Arrow, and Firestorm we see in the "All Star Team Up" trailer.
  • Jossed. Season 1 Wells doesn't care at all about metahumans. They're just a side effect of his attempt to get back to his timeline.

The imprisoned metahumans will be released, likely by Wells in order to cause trouble for Barry. But not all of them will be evil.
The trailer for the final episodes of the first season seems to show the imprisoned metahumans escaping from their prison. This is likely Wells' doing. However, it would likely be virtually impossible for someone like The Flash to take them on all at once, and he won't have to, as some of them may actually aid him. Shawna/Peek-A-Boo was an Anti-Villain in her initial appearance, and she may do a full Heel–Face Turn here. Similarly, Farooq/Blackout will turn out to be Not Quite Dead, and will very much want to seek revenge on Harrison Wells yet again. etc.
  • Confirmed, but not by Wells - they're actually released by Captain Cold via Barry, who is trying to save them from being killed by a second particle accelerator explosion.
  • [[Everyman WAS released by Wells, however, but he was killed while impersonating him.]]

A future episode will involve a Cast Showoff.
We already know that Grant Gustin has an amazing singing voice. I'm really hoping to see the Music Meister, either played by Neil Patrick Harris or Janelle Monáe.
  • Does "Summer Lovin'" karaoke with Caitlin count?

In the season one finale, STAR Labs will be blown up.
There's no better way to raise the drama (not to mention the spectacle) than by having the heroes' base of operations be destroyed. Obviously, the imprisoned metahumans will be freed before this happens. This will obviously leave fans even hungrier for season 2, as it would be a fundamental paradigm shift to the general setting of the show, not to mention leaving the heroes with far fewer resources. Plus it would be a great book end given that it was an explosion at STAR Labs that started this all
  • while STAR remained standing, the season did end with another particle accelerator

Future Rogue-related episodes will include...
  • Mirror Master (likely a metahuman with power over mirrors, though that doesn't mean he can't still have laser-based weapons) and maybe the Top appearing
  • Captain Boomerang, Trickster, and Weather Wizard will join up with them
  • Pied Piper will join, becoming their new Gadgeteer Genius (they can't kidnap Cisco every time someone looses their gun, right?)
  • The group will start to show their usual Punch-Clock Villain sides
  • At one point they'll end up fighting Grodd or Reverse-Flash

Tying together a few of the threads with what we know so far
  • Judging by the titles, "Grodd Lives" will obviously be about Gorilla Grodd and the characters discovering his existence. The previews have shown General Eiling haggard but alive down there, and at least Joe going down there. This troper suspects that Wells/Eobard took Eddie down into these sewers as well in the Stinger at the end of "The Trap", given the lighting and overall atmosphere of the hideout. There will be a confrontation there, maybe with the characters fighting against Grodd. Ultimately, however, this will be a distraction for Wells to sneak back into STAR Labs and free all of the metahumans. The episode will likely end with Grodd beaten, but Wells escaping yet again with a small army of metahuman prisoners... who mostly have grudges against the Flash.
  • The penultimate episode will shift the focus towards the Rogues once more. I'm guessing this will focus on the logical aftermath of Snart taking up Barry's challenge to be a non-lethal crew. Maybe someone gets killed by accident? Maybe the other Rogues don't take well to this new restriction on their activities? Regardless, it will show Snart in a position of vulnerability for once, reaching out to Barry for help. And yes, by this episode's end we will see Pied Piper join the ranks, serving as their Gadgeteer Genius. I'm guessing that at the end, Snart will owe Barry one, leading into...
  • "Fast Enough". The season finale. I also really like the idea of STAR Labs getting blown up in the final confrontation between Barry and Wells. This is going to be the biggest episode, likely with the army of metahumans coming into play in a big way. Maybe Barry has the Rogues to help him now? Given the preview trailer, it will definitely mark the return of Oliver/Al-Sah Him, the Atom, and Firestorm to help. So yeah, big set pieces and lots of big, comic book fights. Things are going to go really badly. The heroes might not necessarily win (I'm guessing it'll be something closer to a Bolivian Army Ending), as the fight between the Flash and Reverse-Flash will ultimately rip a hole in space-time. At the critical moment, Barry taps into the Speed Force and uses it to kill Wells.
  • As to the ending of the season itself: I'm guessing Barry's fight will ultimately land him in an Alternate Timeline. His use of the Speed Force to kill will land him there without his speed, or at least greatly reduced, setting up the Flashpoint arc for Season 2.

Barry's attempt to save his mother in the finale will fail, however...
He will manage to save the real Harrison Wells and Tess Morgan. This will result in a few changes to the timeline, resulting in events similar to those from the original timeline (before Eobard's alterations), but with some differences:
  • For whatever reason, the real Wells will build the particle accelerator around the same time as in the first altered timeline. This will similarly result in Barry getting his powers, as well as presumably all the other metahumans under similar circumstances, though it'll be an actual accident this time around.
  • Certain characters may have different personalities, such as Hartley, due to the lack of Eobard's influence and For Want of a Nail logic.
  • Grodd will still have gained his powers / intelligence from the particle accelerator incident, but most likely didn't get his hands on General Eiling. Most likely had a similar first meeting with Barry as seen in Grodd Lives, though, since the sewer disappearances would probably reach the ears of Team Flash eventually.
  • Speaking of Team Flash, Cisco and Caitlin would probably still be around. Cisco would possibly have some memories of the previous timeline however, perhaps furthering the potential awakening of his Vibe powers.
  • Wally West will exist in the new timeline. It's one idea to bring him into the show, at least. Plus it'd be just like Eobard to make sure the Flash's sidekick didn't exist, not only so that Barry would have one less ally, but just to be a jerk.
  • confirmed-ish? Barry decides not to save his mother after talking to himself.

Barry will spend an episode or two as a member of the Blue Lantern Corps fighting alongside the Green Lantern Corps.
He will gain such a strong reputation as a Hope Bringer that if or when the show sees fit to introduce Green Lantern for a team-up, he will recruit Barry to join his allied Corps who use hope to power their rings. Barry will embrace the role for a while before finding a successor and returning to Central City.

Speedster War
At the time of writing this WMG, we have Barry Allen, Jay Garrick, Zoom, Reverse-Flash, Hunter Zolomon, and Wally West all in one episode.

Barry's Earth (Earth-1) and Kara's Earth (henceforth referred to as Earth-1.5) will eventually merge.

And the next crossover could even be called "Crisis on Two Earths." This would allow Supergirl, Team Arrow, and Team Flash to co-exist (along with the Legends of Tomorrow). This may have even been foreshadowed with Kara's line about two Earths becoming one. Also, Rip Hunter mentioned Superman, in one episode.
  • Looking likely, Supergirl is moving to the CW for its second season, and its unlikely they'll want to force awkward universe hops every time they crossover. Arrow has all but confirmed Batman exists on this Earth too, so if the WMG on the Supergirl page about a Batgirl spinoff ever stands a chance of happening, its somewhat likely this would help. Hell, could go full-on Crisis on Infinite Worlds and throw Earth 2 in there and several other Earths, allowing all kinds of fun developments. Going to expand on that idea...

There will be a massive four-part crossover between CW's Superhero shows, resulting in a Crisis on Infinite Earths situation
As noted two entries above, Supergirl is coming to the CW and it's likely they'll do something to merge the universes together. However, its just as likely that they'll go bigger, and merge Earth 2 and another couple of worlds together in some fashion. Most likely, the mess of the timeline will cause the Red Sky disaster to happen early, prompting a team-up between Team Flash and Team Arrow. Sensing the problem this poses, the Legends will also come to the present to help stop it, while the universal merger will allow Team Supergirl and the Earth 2 superheroes to help. In the end, several universes are destroyed but the remaining Earths will collapse onto each other, creating a single world that's similar enough for each show to continue, but has lasting effects for them all to explore. Possible results:
  • Black Canary is alive again, but is a composite between Laurel and another universe's; she's more headstrong, tougher, a Metahuman, goes by the name Dinah, and wears fishnets. IE, a comic-accurate Canary.
  • Jay Garrick (who, lets be honest, is almost definitely the Man in the mask) is now on the same Earth along with some other heroes, who form a team of older heroes to train younger ones ala the Smallville comic version of the Titans. This would make room for a spin-off about the Justice Society/Titans composite, featuring Jay, Wildcat, Alan Scott (if they can get him), Liberty Belle, along with younger characters like Wally, Roy and/or Thea, Evelyn, Jesse, and maybe some new ones like Stargirl and Cyclone.
  • As a twist, instead of how it happened in the comic, Kara lives through the event but Superman dies in her arms, leaving her as the only Kryptonian hero known. This would put a bigger pressure on her and make room for drama.
  • Assuming that they quit it with the embargo (what, with both Flash and Supergirl getting away with it), more Batman and Superman supporting characters will show up, even if the two themselves can't appear. Oracle would make a great Always Someone Better to Felicity to counteract her Creator's Pet nature, Nightwing would be fun to see, while Kon-El and Steel would be neat to see on Supergirl.
  • Other developments other people could add.
  • My personal belief is they'll wait until Gotham gets to where Bruce is Batman, and have him be the main Batman in the story. If DC wanted to go really big, what they could do instead is adapt it into a two-part film, involve the movie universes (like, even older ones) and then have the films and shows be the same universe, and keep the main ones mostly in film but have it possible for them to appear occasionally in the show in order to have one cohesive live action DCU like Marvel has.

The Rogues will form in season four and will be the series "Big Bad"
  • Most news articles I've seen are tired of having speedsters as the big bad, so it would make sense for non-speedster criminals to be the main villains
  • The Rogues will be led by Mirror Master and The Top as Captain Cold and Heatwave are currently in 'Lo T', and the actress portraying Lisa Snart is currently filming another television show, Frequency, I believe. The group will also consist of Pied Piper, Peek-A-Boo, the Tricksters, and Weather Wizard
  • In the midseason finale, the Snart siblings and Mick will return and recruit Magenta, Julian Albert and Killer Frost, setting up for the Rogues war.
  • Grodd will return, which will mean the two sides work together to help the Flash and their team of heroes, and will stay a team even after Grodd is defeated
  • Rosa Dillon and Lisa Snart will start dating

    Future Heroes 
Hotspot is coming!

Cisco will eventually become Vibe, with vibration-inducing powers
With the twist that this version is a HORRIBLE break-dancer.
  • Confirmed. Well... all except the break dancing part.

Caitlin Snow will eventually get ice powers, but she won't become a villain and will be just called Frost
Or even Ice, though that's a different character.
  • Confirmed... ish. Her Earth-2 counterpart is Killer Frost.

Hal Jordan (pre-powered?) will show up and become good friends with Barry
They're traditionally Heterosexual Life-Partners in the comics, and there have been references to him on both Arrow and The Flash.
  • If Hal ever appears, Barry and Ollie will compete who gets to be Hal's BFF. Played for Laughs, of course!
  • All but Jossed in "Rogue Air". In this continuity, Ferris Air closed down after "a test pilot went missing", which is about as clear a reference to Hal as you can get without dropping his name.
    • Possibly confirmed for Earth 2! Barry, as he has Hal's number on speed dial.

Another Flash (or Kid Flash) will show up from the future
Could be either Wally West or Bart Allen (the latter actually has Time Travel as part of his comics backstory). Wally/Bart will be from the same future that Harrison Wells has information about (or is actually from), from a point of time either during, or immediately after, the 'Red Skies Crisis' of 2024. If this happens in Season 1, maybe he's the one who warns the younger Barry about Harrison Wells.
  • Wally is jossed. Turns out he's from the present.
  • Well, Reverse-Flash did (twice)

The Particle Accelerator Explosion caused Ronnie to be fused with someone else (or some tech stored in Star Labs)
So he will still either be part of Firestorm or the Firestorm Matrix.
  • Or he exists as a ghost who can't be seen or heard unless he possesses someone. And then he's still only a voice in his host's head.
    • Ronnie was fused with Martin Stein. And they figured out how to un-fuse.

Ralph Dibny (Elongated Man) will show up soon
He and Barry were friends in the comics and he might show up here probably in the later seasons. He might not have his powers yet and is probably single at that time before he meets Sue.
  • Part of his arc could be meeting and falling in love with Sue.
  • This is looking good as of "Power Outage." Ralph Dibny is among the names Wells lists as casualties of the particle accelerator. The fact that he supposedly died isn't even that bad considering Ronnie Raymond "died", but we already have an actor lined up so we know he's coming back.
    • Also consider that Harrison Wells could be lying that he died (it wouldn't be at all out of character for him) and that Ralph is alive and well, and his newly developed stretching powers have been a huge help to his struggling detective career.
    • Confirmed! Elongated Man is set to be a semi-regular in season 4!

Fire will show up
And basically be a green female version of the Human Torch with added Bi the Way for good measure.

Caitlin Snow will become Snow instead
In contrast to a WMG below but how she gets her powers will be after exposure to the actual Killer Frost's powers.

Jesse Chambers and her dad will appear and appear to have a similar backstory to Barry's
And Jesse will be a short time love interest for Barry or at least have a non-Carrie Cutter one-sided crush on him. Maybe she'll even get her powers in her introductory episode.
  • Jossed. Jesse is the daughter of Earth-2!Wells

Max Crandall will appear and will simply call himself Mercury

The "other speedster" that was there when Barry's mother died was Jay Garrick
Arrow brought back Wildcat for a cameo, who's to say that Flash won't follow suit and bring back another JSA member?
  • Jossed, it was Barry

The Ryan Choi version of the Atom will appear.
He worked at a Palmer Technologies facility in Central City and was experimenting with dwarfstar alloy the night of the explosion, which gave him size-shifting powers.
  • He won't use the name "Atom" and will take the codename of another DC size-shifter like Molecule or Micron.

Captain Atom will appear.
We've already have Eiling, Plastique, the alias "Cameron Scott" was mentioned; it's only a matter of time before Captain Atom himself shows up.
  • Well, considering Eiling and his scientists isolated the Firestorm Matrix from Stein's cells we may be one step closer to the Captain being made.

The heroes on the CPD mural.
"Hephaestus/Vulcan, Hermes/Mercury, Hera/Juno, Zeus/Jupiter, Hades/Pluto, Apollo, and Poseidon/Neptune. Obviously, Hermes = the Flash and Apollo (the archer) = the Arrow..." Vulcan is Cyborg, Juno is Wonder Woman, Jupiter is Superman, Pluto is Batman, and Neptune is Aquaman. Vulcan could also be Mr. Terriffic, but DC's been pushing Cy harder in their adaptations since the Teen Titans animated series; he fills both the "black guy" and "technology-based hero" slots neatly, being a founding member of the Justice League itself in New 52. Alternatively,the lineup will be something like (taking into account the recent announcement of the Teen Titans and Supergirl shows who may be in canon to the main ones):
  • Zeus- Shazam/Captain Marvel, or else Atom, just to shake things up a bit and wink at the fanbase.
  • Hera- Supergirl
  • Hades- Nightwing
  • Hephaestus- GL (or Cyborg, or Firestorm, or Atom, all known for creating stuff for/with their powers)
  • Hermes- Duh
  • Apollo- Duh
  • Poseidon- Aquaman or Aqualad
    • Going off of the heroes we have now, I'm guessing: Zeus/The ATOM, Hera/Supergirl, Hades/ Martian Manhunter, assuming there's a Supergirl crossover, Hephaestus/Firestorm, Hermes/Flash, Apollo/Green Arrow, and Poseidon/Aquaman (guessing from all the references to Atlantis on Earth-2)
The Question/Vic Sage will appear
He will be introduced as a PI from Hub City helping Joe with a case, but is later revealed to be a superhero. This version will take queues from both his Justice League and Comic incarnations.

Booster Gold will appear
And he will introduce himself as a time cop sent from the future to keep the present safe from being exploited by time-traveling criminals (like Eobard Thawne), only to soon reveal himself as a time-traveling nobody who is trying to exploit the present by cashing in on the rise of superpowered heroes.
  • If not in The Flash then in the proposed Flash/Arrow spinoff series. Arthur Darvill has already been cast as veteran DC time-traveler and some-time Booster Gold associate Rip Hunter, so it's a distinct possibility.

Henry Allen is secretly Barry from the old show.
Tina and James Jesse appear to be the same characters, so why not, right?

The Russian speedster team Red Trinity will appear.

Old Timeline Cisco will travel to the current timeline and become Vibe
He gained latent metahuman potential due to the reactor's explosion, but due to the Reverse Flash vibrating his hand through him, it has activated his potential and gave him Super Speed-based vibrational abilities. He then travels back in time to warn everyone about Dr. Wells and teams up with the current timeline's Team Flash.
  • "Old Timeline Cisco" is dead. He can't travel to the current timeline.
  • However, the part about him becoming Vibe is true.

Green Lantern will appear at some point in this universe
Most likely in the upcoming 'Legends' Spinoff, but it'd make sense for Hal Jordan to appear at some point, given his close friendship with both Barry and Oliver. While it might be difficult, given the success the show's had with both Firestorm and Atom's abilities, a Green Lantern should be doable.
  • Hal Jordan is referenced in the episode "Rogue Air", when Barry mentions a Ferris Air test pilot who went missing.

Two Firestorms for the price of one!
Ronnie Raymond was thrown into the other world and in a similar fix as Dr. Stein... until he meets a certain Jason Rusch.

    Future Villains 
Grodd's plan will be to make other gorillas super-intelligence as he.
In order to rule over the humans, making them their slaves and experiment on them as they've done to him. Though most of the gorillas will refuse to follow Grodd, especially Solovar who tells him that they shouldn't be like the humans. In the end, after Grodd's dead or defeated, the gorillas led by Solovar thanks Barry and leave for Africa.
  • So pretty much Gorilla versions of Caesar and Koba?
    • That's one way to put it.
    • Is it bad that I want this to be the case?
    • Not at all.

Pied Piper's introductory episode will be a Musical Episode
Grant Gustin (Barry), Jesse L. Martin (Joe) and Andy Mientus (Pied Piper) are all broadway vets, not to mention the latter two both appeared on Smash and the former on Glee. Add to the fact that Piper has Mind Control Magic Music, which could even justify why everybody is breaking out into song.
  • Jossed. Unless Hartley upgrades his equipment, he doesn't have the mind control aspects of his comic counterpart. In fact, he more closely resembles Batman Beyond's Shriek, or Spider-Man's Shocker.

The first season finale will be the forming of the Rogues.
And it'll end with Pied Piper pulling a Heel–Face Turn and joining Barry.
  • Jossed. Captain Cold gains the alliegance of a few during "Rogue Air", but the Rogues as a team are yet to form.

Mark Mardon will appear as a more traditional Weather Wizard
Clyde thought he had died, but maybe he was only unconscious or blown clear. After finding out that Clyde is dead, Mark will develop Weather Wizard-esque technology and try to avenge his brother.
  • It's also entirely possible Mark got weather powers too and like Barry was in a coma all this time.
  • Confirmed. Liam McIntyre has been confirmed to play Weather Wizard in episodes 15 and 16.

Clock King and Count Vertigo will work with Cold and Heatwave at some point
Because Prison Break.

Amaury Nolasco will play one of the Rogues
See above.

Caitlin Snow will eventually do a Face–Heel Turn and become Killer Frost
It's been confirmed by Danielle Panabaker that Caitlin will become Killer Frost sometime soon. However, whether or not her transformation will involve a Face–Heel Turn is still unknown.
  • We do know that her Earth-2 doppelganger already is

Other evil speedsters will appear in the show
Aside from Reverse Flash, other evil speedsters might show in future episodes such as:
  • Savitar
    • Confirmed
  • Black Flash - The Grim Reaper of speedsters. They might put some Nightmare Fuel in it.
  • Johnny Quick - From the Crime Syndicate. If he appears, they might do the same thing in Smallville where Clark was transported to Earth-2 while his Evil Counterpart, Ultraman, went to his Earth and terrorizes his friends.
  • Blue Trinity - A Russian speedster team.

The people on Wells' List
are not actually dead. We already know that Ronnie Raymond probably didn't die. Also, Wells either has Future knowledge or he's from the future himself. So, the names on that list are the real names of heroes he might have known would get powers in the Accelerator Explosion. He might have gotten to them days after the explosion and subdued them. Possibly handing them off to Eiling or ARGUS.

King Shark will appear.
Central City is close to the water so it's possible a shark was swimming by when the particle accelerator exploded. Or perhaps Central City has an aquarium.
  • Confirmed, sort of. He's from Earth-2 in this version.

Captain Boomerang will eventually get off the island and join the Rogues
Maybe he'll get out when Deathstroke escapes planing to make good on his promise to Oliver, and he'll joing up with Snart's crew

The Music Meister will appear
He'll be an Evil Mentor for Pied Piper, since they have similar powers (the main difference being that Piper is gadget-based and Meister is a metahuman). And of course Neil Patrick Harris will reprise the role.

Vandal Savage will be a future Big Bad

Gorilla Grodd may already be in play
We may have already seen Gorilla Grodd in play (albeit offstage). Two scenes worth consideration. The first is in "Plastique" when Wells talks to Plastique in private back area and convinces her to go after General Eiling and kill him. The way Plastique responds in that scene seems very much like a suggestion that was reinforced by a telepathic mind control "push". The other scene is in "Flash vs Arrow" where (again in a private back area) Wells talks to Felicity trying to obtain the identity of the Arrow. He asks pointed questions that would tend to bring Oliver Queen's name to the forefront of her mind. Granted, Wells would have the resources (ie time travel, his future knowledge supercomputer, etc) to discover the Arrow's identity without using Grodd, but then the scene seems unnecessary because by then Wells would seemingly already have had enough basic information about Team Arrow he'd need to do his search.

Mirror Master will appear!
Mirror Master will be a man who steals technology to go to different planes of existence, and will use it for crime... Because he is a massive idiot. He will then join the Rouges, and be the comic relief!
  • Semi-Confirmed, apparently on H.W's earth he's a technology user but the one we see is a metahuman.

Mister Freeze will appear
This version will be a metahuman endowed with superhuman strength but an inability to survive outside of subzero temperatures due to a cryogenics experiment during the particle accelerator explosion. He will start out with simply his suit, but will gain a Freeze Ray like in the comics after copying and improving Cold's gun. His plot involves him stealing a chemical needed to stabilize Nora, but he is defeated. Desperate, at the end of the episode he turns to Ras' al Ghuul for help, leading to Nora being reborn as Lazara.

Grodd and Wells will experiment on Eiling.
The end result will be the general being mutated into his monster form from the comics.
  • Or his soldiers will find him seriously injured and experiment on him to save his life. He thanks his men by slaughtering them. And then he rampages to Central City to get revenge on Flash.

Lisa's supervillain name won't be Golden Glider (or just Glider)
She doesn't glide so she can't be Glider. Instead she will be Gilder because she covers things in gold. Golden Gilder for redundancy.

Kadabra will show up once time travel has been elaborated on.
A time traveler from Wells' era, he'll be a successful magician in the present thanks to his future tech, but Wells' efforts to travel back to the future will turn his interests to Kadabra and somehow pit Kadabra against Team Flash.

The HIVE will have influence in this show as well as Arrow
It will turn out that Bug-Eyed Bandit was hired by HIVE to develop unique weapons for them, leading to HIVE starting to target the Flash and other metahumans.

Ronnie will return... as Deathstorm.
It's a comic book show, so how could being sucked into a black hole not turn someone into a super villain?
  • Confirmed, kind of. It appears that Deathstorm will be his Earth-2 Doppelganger, and he will be the Clyde to Killer Frost's Bonnie. The whereabouts of Earth-1 Ronnie are still unknown.

If Armando Ramon ever dose appear he'll be played by Richard Tyson
  • He looks like an older, bigger Cisco, he'd make a really believable Big Brother Bully.

    Harrison Wells 
He's Jay Garrick
The yellow suit is just a random plot twist.
  • Jossed

Harrison Wells is the Reverse Flash
He's the time traveler from the future, like Eobard Thawne, and his wheelchair recalls Hunter Zoloman. He'll find out he's in a Stable Time Loop and that will be his Start of Darkness.
  • He could already have superspeed, which cold be how how got into Stagg's office — He ran, and merely pushes the wheelchair around. While it coudl be justified as a Stealth Hi/Bye, the show specifically draws attention to how he got into the building.
  • This would explain how the Reverse-Flash knew Joe was looking into him in "The Flash Is Born". Joe had discussed his investigation with Harrison earlier.
  • Confirmed. He is Eobard Thawne.

Wells will turn Eddie into the Reverse-Flash
Wells could be the Reverse-Flash of the future, and thus he needs Eddie to become the Reverse-Flash so that Wells himself can. Wells will implant certain ideas within Eddie's head, which will culminate in him becoming the Reverse-Flash
  • Jossed. [[Spoiler:Eddie killed himself, and wrote Thwane out of existence in that timeline.]]

Wells will mentor Barry to prevent his death
And will eventually realize that his methods aren't changing the future enough, and so creates the Reverse-Flash (himself or Eddie) in order to toughen him up for the Crisis. Eventually, he'll also adopt the idea that suffering builds character, akin to Hunter Zolomon.
  • Heck, Barry telling Wells what inspired him to become a hero could help encourage Wells in that direction
  • Jossed, but some elements made it into Season 2. Wells making Barry get faster for example, though not for the Crisis...

Harrison Wells is Barry Allen from the future
He traveled back in time to create a Stable Time Loop, creating and mentoring himself.
  • Barry's really not the type to murder a guy, even to preserve the timeline.
  • Jossed. Wells is actually the Reverse-Flash, Eobard Thwane

Harrison Wells is a Composite Character of Professor Zoom and Darwin Elias
Being both a time-traveler trying to help Barry "fulfill his destiny", and one of Barry's idols in the scientific community with a hidden sinister streak. This could lead to Wells giving the Rogues superpowers at some point.

Wells isn't Reverse Flash at all.
He's Pariah.

Even refers to himself as such in the second episode.

Instead of time-hopping, he comes from another dimension to try and help Barry get ready to defeat the Anti-Monitor before he destroys this world too.
  • Jossed

Wells is Professor Zoom, Eddie will become Zoom
To be more specific, Wells is the nut who comes back from the future to make Barry's life miserable because he's a bastard like that. Eddie will get injured in an accident that will give him the reverse of Flash's powers and he'll dedicate his life to making Flash's life miserable so he'll be a better superhero.
  • Confirmed, Wells is Professor Zoom (though he's not called like that...yet). As for Eddie, we'll see..
  • Eddie's dead

Wells is Rip Hunter
In order to ensure that the time-line stays stable, he's come to protect Barry's life at any cost. Plus, seriously "Harrison Wells"? "HG Wells"? The guy who wrote The Time Machine?
  • Jossed, since Arthur Darvil will be playing Rip Hunter in another spinoff.

Wells is Abra Kadabra
Because we might as well hedge our bets with Barry's OTHER time-traveling villain.
  • Jossed

Wells is a descendant of Barry from the 31st century
The comment he makes in a flashback in episode 3 is blatant foreshadowing at the least and it would explain how he had knowledge of how to create the particle accelerator which would be common knowledge in that time period. It would also explain his knowledge of Barry as the Flash, likely being part of the heroic Allen lineage found in the comics.
  • Jossed. He's a descendant of Eddie

Wells came back in time to help Barry survive the Crisis
Tying in with the above theory if Wells is descended from Barry than he would likely know about the circumstances of Barry's "death" in the Crisis. Having figured out a way to travel through time Wells went to a point in time where he could give Barry his powers earlier than he would have gained them and planned to train Barry so he could carry out his role in the Crisis and live through it.

Wells is Vandal Savage.
Savage has been know to use his immortality to send information back to his younger self to change history for his benefit, all we know of Well's future knowledge is the holographic newspaper and his comment of "feeling like he's waited centuries" could be a more literal than most people's use.

Wells is Barry from a pre-flashpoint type timeline and found himself in the past
And he's pulling a Kessler

Wells isn't Pariah, he's one of the Monitors
He's collecting and creating superhumans to achieve the outcome he wants for the Crisis, and like any good Monitor, he's been observing everything for some time before choosing to act. This being a relatively grounded CW show, the Monitor is less a cosmic entity than a meddlesome time-traveler. Only time will tell if Wells is more like the main Monitor(s) or the Anti-Monitor.

Wells is T.O. Morrow.
Or at least the show's equivalent of the character. Wells has yet to display any actual powers, has been called "sincere" by the producers, and is closer to a Knight Templar than anything else. If he were a version of Morrow, it would explain why his future TV screen is there; it's one of Morrow's earliest gadgets. And having knowledge of the future would explain why he would fake his injury (he was hurt in the altered timeline, so he follows it now to avoid causing any major ripples) and why he is so obsessed with preserving what he can of the status quo. If he knows that the Reverse Flash is out there, and is already changing time, he might be the show's Big Good counterpart for a while.

Wells has mind-control powers
Which is how he managed to convince Plastique to kill General Eiling so easily.

Wells is trapped in a predestination paradox time loop.
Say that Wells is from the future but did not originally come back in time for the Flash. Instead, he met his wife and lost her in the accident. Knowing that the Flash would be a life-saving hero with the power to travel through time, he sets out to create the Flash to save his wife. When the time comes for the reveal, Barry will be wary of creating a paradox and will refuse. This will so enrage Wells that he will acquire the power of speed for himself and become the Reverse-Flash, travelling back in time to kill Nora Allen to teach Barry a lesson. Barry will follow him and they'll duel across time, causing not only Nora's death but also Wells' wife's death as well before Barry stops him. Thus leading the whole cycle of events in the first place.

Wells is not from the future but his wife was.
Wells in an unaltered timeline originally created the particle accelerator that gave Barry his powers. The Reverse-Flash went back in time to kill him before he could and Tess Morgan also went back to prevent that and became close to Wells as a result. She eventually revealed she was from the future and showed him futuristic technology to prove it while also telling him how history would play out. When Reverse-Flash attacked to kill him Tess pulled a Heroic Sacrifice to drive him off. Wells moved to Central City so he could protect Barry as a young boy and keep the time stream from being altered but something prevented him from stopping Nora's death and Henry's incarceration.

Wells is Michael Carter.
He's a time-traveler devoted to "fixing" history. Gideon is his version of Skeets.

Wells is Chronos.
A time-traveling supervillain

Wells is Metron.
A morally ambiguous time traveler who gets his powers from a chair.
  • Metron has disguised himself as a guy in a wheelchair before.

Wells is The Master
Someone had to say it.

Wells didn't figure out Arrow's true identity on his own
. He already knew, because of his knowledge of the future. He asked Felicity only to test the waters and see if she trusted him enough to disclose that secret (and also to give the impression that he didn't know and was 'working' on finding out).
  • Possibly. As of "Public Enemy", the Arrow's been publicly outed as being Oliver Queen. This piece of news could easily be in Wells' database, depending on how extensive it is and Oliver's future activities.

Wells replaced Professor Martin Stein.
In the original timeline, the particle accelerator was built by Martin Stein, the other half of Firestorm, and it was Stein, Cisco, and Caitlin who helped Barry become a hero.

Wells is a corrupted future Flash
. If you look at the key hole which he places his ring into, it has the Flash logo, not the Reverse-Flash's. Harrison could simply have modified the ring in order to mess up the colours on his suit as a sign of rebellion or the like. If he'd used the ring as intended, the suit would've turned red.

Wells is the future Eddie Thawne.
Like his comic counterpart, Eddie got plastic surgery in order to look like Barry, but for a reason other than being a fanboy. Instead of being a fanboy, Eddie decided to travel back in time to make the Flash better, in order to save Iris. That's why he spares himself the beating.

The man we know as Harrison Wells is a clone

WARNING: Spoilers for "The Man in the Yellow Suit"

  • The actual Harrison Wells (or whatever his real name is) is Reverse-Flash, the one who was wearing the Yellow Suit. The Wells we know is a clone of him. His job is to monitor the future and ensure things go the way that Reverse-Flash wants them to (and to keep Barry safe). Since Reverse-Flash needs to play the villain in this plan (seemingly to motivate Barry to become the hero who stops the Red Sky crisis), he sent his duplicate to kick things off by triggering the particle accelerator explosion. The duplicate also keeps the yellow suit in safe place when Reverse-Flash isn't using it. After all, there have to be some occasions where the guy has to do errands at normal speed (if his powers work like Barry's, he has to consume large quantities of food in order to avoid starving and unless he's constantly knocking over fast food joints and grocery stores at super-speed, he probably buys his food like everyone else), so he wouldn't be able to wear the suit all the time without attracting attention. This theory would explain how Reverse-Flash was able to be in a cage while Wells "interrogated" him. Even if you have super-speed, you can't be in two places at the same time, but if there's actually two of you, then you can.
    • Jossed. Wells is the only Reverse-Flash and their encounter was a combination of hologram and speed-trick.

Wells and Reverse Flash are temporal duplicates of each other

Harrison Wells has a split-personality disorder
One personailty is Harrison Wells the man who would do anything to protect the Flash and the other is The Reverse-Flash. It explains why Wells is Barry's mentor. He's training Barry to take himself down.

Wells will find out Joe and Eddie are investigating him and do one or both of the following
  • Kill Joe because happiness and superheroes don't mix these days.
  • Take Eddie under his wing and start him on his own dark path

Wells is training Barry to take his place.
Wells was the speedster in the future who originally vanished during the Crisis event. That sent him to this time. He's trying to subtly train Barry to do better than him once his connection to the Speed Force severs.

Harrison Wells is Reverse-Flash, just not the one in the comics.
In this universe before the future Flash died he made Reverse-Flash promise to fix the future since only speedsters can time travel. RF decided that to do that Barry must live, so he went back and didn't know Zoom followed him. Originally RF had yellow lightning since he got his powers in a recreation of how Barry got his so they both had yellow lightning. RF and Zoom fought once they got to the past. Barry's mom just was in the wrong place wrong time, RF attempted to stab Zoom and Zoom used her as a shield. Then Zoom hauled it out and went into hiding while RF started his less then golden attempts to make Barry the Flash. However due to changes to the future he lost his speed so he remade the scenario that made Zoom, though this lets both him and Zoom feed off each other, explaining his speed malfunctions and need to siphon the Speed Force. Zoom has now caught on to RF and is attempting to undermine him by making RF appear the villain... Wells (RF) knows this and has come to terms that to save his ward (Barry) he must be the bad guy to make him better since he knows Barry will never trust him when he finds out, and knows he will... Tragedy and tears will ensue, Wells given how he cares about Barry will likely take the "Zoom bullet" for Barry as his redemption equals death.
  • Jossed. Wells is Eobard Thawne, aka Professor Zoom.

The "Red Sky Crisis" from Wells' future is caused by the Anti-Monitor.
In addition to the word "Crisis" being used and the mention that the Flash disappears during the event, in Forever Evil, a red crack appears in the sky as a sign of the Anti-Monitor's arrival.

Harrison Wells is the show's version of Hunter Zolomon.
Only his name is actually Harrison Zolomon Wells, with his nickname being Hunter. He is from the 31st century just like Eobard Thawne and the two were even friends. They were both fans of the Flash and dreamed of being heroes like him. But one day Eobard discovered that he would one day become the Reverse-Flash which warped his mind to embrace Because Destiny Says So. Eobard would recreate the accident that gave the Flash his powers to gain his own. Harrison, who was wheelchair bound, stumbled onto the experiment and tried to stop only for both of them to connect to the Speed Force. Harrison regained the use of his legs and Eobard was warped further than he already was and decided to go back in time to try and Screw Destiny by making it so Barry would never receive powers by killing the person who would create the particle accelerator. He also intended to take Barry's place as the Flash after he did so, setting things up so his trip to the past was one way. Wells was able to interfere, which sent both of them back further than Thawne planned. They arrived sometime during Barry's childhood. Thawne set out to find Tess Morgan who would create the accelerator so he could fulfill his plans while Wells set out to find her to thwart them. Harrison was able to convince Tess he was from the future by showing her the tech he brought with him and eventually they fell in love and married. Thawne was responsible for the "accident" that killed Tess but somehow the future remained unchanged. Wells and Thawne both realized that this meant Barry would gain his powers and become the Flash, so both would head towards Central City with the goal of protecting Barry or killing him, respectively. The night of Nora's murder however was one of the times when Wells' Speed Force connection was in flux so he couldn't intervene. Thawne failed that night because of a time traveling Barry and never tried again both because of his own unstable Speed Force connection and because he was worried by Wells' presence in the city. After the explosion Wells chose to pretend he was wheelchair bound so Thawne's arrogance would let him think Wells wasn't a threat and that he could make Wells be Forced to Watch as he killed Barry. But Wells in a moment of Crazy-Prepared designed the accelerator in such a way that the explosion would worsen Thawne's Speed Force connection, which kept him from going after Barry while he was comatose. It was Wells who appeared before Joe so he wouldn't be drawn into conflict with someone as dangerous as Thawne. It was Thawne who fought Barry and appeared at Star Labs but he was Outgambitted by Wells who prepared a fake tachyon device to fool Thawne while keeping the real one for his own purposes. The reason both wears the same costume is that Wells is mocking Thawne by acting as the hero he wishes he could be.
  • Jossed. He's Eobard Thawne.

Eobard Thawne stole Harrison Wells' Identity
After killing Nora Allen, Thawne killed Harrison Wells, the physicist who originally created the particle accelerator which gave Barry his powers. After killing him he stole his identity. That’s why the DNA test from the blood in Barry’s house didn’t match "Wells", they were comparing it to the original Harrison Wells.
  • CONFIRMED! (as of "Tricksters")

The real Harrison Wells was the Flash's mentor in the original timeline.

    Wally West 
Wally West will appear later on
He's initially Iris' nephew who takes an interest in and later idolizes The Flash. However, after an accident involving a villain and electricity, he's fatally wounded until The Flash rescues him, but both get electrocuted. As a result, Wally gains The Flash's powers (as the original comic story would be too contrived to work in live action), forcing Barry to make Wally his apprentice.
  • If it's a lightning bolt from a villain, Mark Mardon taking his place as the traditional Weather Wizard is probably the best way to go.
  • Confirmed. Wally West will appear in "Running to a Stand Still" in Season 2.

If/when Wally West appears
The writers are going to make him closer to the Pre-N52 Wally West, knowing how well the fans reacted to the way he is written in the comics.
  • Jossed he is the post -52 version as well as Joe's biological son, instead of nephew.

Wally will have a slight Age Lift in the show
While still Iris' nephew, he'll likely be closer to his late teens than Wally usually is as Kid Flash, as Roy has had in Arrow. That way he can be closer to his comic self's age prior to the reboot but still young enough to be trained by Barry.

Wally West will eventually become Kid Flash whenever he appears
Because hey, Barry needs a Watson.
  • Bonus points if 'Kid Flash' is treated more like an Embarrassing Nickname rather than a codename, allowing them to keep the name without forgoing it due to cheesiness.

Wally will appear at the end of Linda's introduction episode
Possible, but it seems like Linda is shaping up to be a love interest for Barry Allen. Which is kinda weird, considering she's the wife of a grown Wally West in the comics.
  • Worth noting is that Linda in this show appears to be a contemporary of Barry (stated to be 25 at the start of Season One) - she is also seen (played by Olivia Cheng) reporting on the reactor explosion in Arrow when it's taking place, making it unlikely she's a teenager. Malese Jow, her actress (as of The Flash) is turning 24 in February 2015 and is less than a year younger than Grant Gustin... We also don't know how old Wally will be in this continuity if/when he appears (and relative to Barry's age), but it seems clear that unless he's in his 20s in the first 2 Seasons then a relationship with Linda, if it happens, would be a case of Likes Older Women (Not That There's Anything Wrong with That!)

Wally, if/when he appears, will be made Joe's nephew
There has been no mention of Rudy in any of the flashbacks meaning its unlikely Iris has an older brother, and Joe doesn't look old enough to have a teenage grandchild. If the writers decide to take Wally in they'll make Rudy into Iris' uncle and Wally will therefore be her annoying little cousin.
  • On the contrary, age doesn't necessarily equal appearance. Rudy West could be an estranged family member because he had a disagreement with Joe. Or, grew up under the care of Mrs. West after a divorce while Joe raised Iris. Two birds, one very big stone.
    • Joe seems to be roughly in his mid-to-late 40s when the show begins - his actor was 45 when he filmed his first scenes, and his onscreen daughter is implicitly close to Barry Allen in age (though Candice Patton is 26 in her first scenes). Unless he's actually in his 50s - with a son roughly 10 years older than Iris is - the likelihood of his having a teenage grandson is presently low. Not impossible mind you, but we haven't yet got all the necessary information to be sure of this one. Additionally, going on this track...
    • Joe might be Wally's maternal grandfather in this continuity - his older daughter Mary West (5+ years older than Iris) had a Teen Pregnancy which led to estrangement from her family (possibly involving a divorce). Raised Wally as a single mother, until something brings him (and possibly her as well) into Joe and Iris' lives.
      • Half-Confirmed:In this adaption Wally will not be Joe or Iris' nephew but Joe's son and Iris' younger brother. Their mother Francine left Central City and he was born 8 months afterwards.
      • Actually fully Jossed as in this case he is Joe's son and not his nephew.

Wally and Hartley will become friends when Wally is inevitably introduced, leading to Hartley calming down and taking a few levels in kindness until he has a Heel–Face Turn
I'm thinking that Wally will, probably by late Season 1/early season 2, have joined the cast, and like Roy did in Arrow, will join Team Flash once he's gained powers. Hartley will likely return and, by some turn of events, meet and befriend Wally (maybe he ends up in the Pipeline again and Wally ends up talking to him). When Hartley next goes on a rampage (probably against his parents), Wally will instead talk him down, showcasing his ability to stop villains by being friendly instead of powerful.

Wally will not be a West
He'll be Wally J. Garrick.
  • Unlikely. The creators outright said Wally will be a West.
  • Jossed , he is a West.

The birth of "Flash Facts"
Barry and Wally will trade scientific facts with each other while running and/or talking at super-speed.

Wally will collect the spoils of war and keep them on a shelf as a Running Gag
Becoming a Kleptomaniac Hero as a nod to Young Justice.

Wally will team up/butt heads with Roy Harper
And possibly along with Thea and maybe Sin from Arrow. Forming a semi Teen Titans episode. They will both learn to see eye to eye and work together much like their mentors.

Wally will be get an comment about being impulsive
And he will be called Impulse instead of Kid-Flash as a result. And yes this idea did come from the Arrow episode evolving the Arsenal comment.

Wally's costume will be Blue and Yellow
  • I guess the yellow is obvious, but why blue instead of the classic red?
    • Apologies are in order. Forgot to add in the likelihood of the costumes being basically the same with minor aesthetic differences, like Oliver's and Roy's costumes. Though that just brings up why they wouldn't go with the Silver and Red colour scheme from the New 52 or a different pattern feature the red and yellow combo. But the main point is that it adds some contrast to the two.
    • Also the blue could be a shout out to another speedster known as Max Mercury who may not ever appear in the show.
    • Jossed. The trailer and promotional images for Season 3 show him in the classic yellow and red costume.

Wally will have a Ship Tease with Thea
Nothing may actually become of it, but with Thea being similar to Young Justice's Artemis and Wally being...well, Wally, it could make for an interesting chemistry. Or they might just fight a lot.

Wally will, slowly, develop into the second main character, or even replace Barry, after he's brought in
Unlikely given how heavily involved Geoff Johns is, given he's the one responsible for Barry taking the Flash mantle back and is the biggest pusher of the 'Barry is the bestest Flash ever' parade, but here's how I see the show going. Over the course of Seasons 1 and 2, Wally will follow the same way Roy did in Arrow, being introduced and tied with other characters plots (likely Joe and Iris), develops a hero worship for the Flash, then after being exposed to the Speed Force, develops similar super-speed, which leads to Barry having to teach him how to control and manage his powers. Unlike Roy, however, he won't go crazy, and by the end of the season, Barry will give him a spare Flash suit to help deal with the Big Bad. Then comes Season 3, with both Barry and Wally now sharing the role of the Flash (maybe with them sharing the opening line; IE "My name is Barry Allen/and My name is Wally West....We are the Fastest Men Alive, we are, The Flash"), becoming his protege and partner (maybe, as suggested above, with 'Kid Flash' being used as a nickname to reference the fact he's younger). In Season 4 or 5, the Red Sky Crisis thing will happen (earlier than predicted), and by the end of it, Barry will end up giving his life to saving everyone from the Crisis, leaving Wally to take the mantle alone. In the following Season, Wally will continue as the Flash, now trying to continue Barry's legacy but with a noted lower success rate and displaying obvious signs of Stepford Snarker tendencies. From there, they will adapt the Return of Barry Allen storyline and end with Wally beating the Reverse Flash and the other awesome stuff he did in that story.

Wally will be the result of a Cosmic Retcon and Barry's time-travel.
Barry, the one we've been following, will travel to the past knowing what he knows now. Whether or not he saves his mom is irrelevant. What's important is that somehow, Barry causes Joe to end up with the woman who moved into the Allen house after the murder. They fall in love and have a son, Wally West, and Iris' half-brother. Barry comes back from the past and finds himself with an adoptive kid-brother he never grew up with.
  • Adding to this, its possible that in whatever was the 'original' timeline before the Reverse-Flash travelled back and killed Nora, Wally was indeed going to be born, but Zoom deliberately aranged for this to not happen so as to stop the Flash gaining a similarly powered ally after all, he needs a Flash for time travel, not two. By stopping Reverse-Flash in the season finale, Barry will remove his influence from the time stream and when he returns, find that the world is a very different place, complete with a young Wally West.

Wally West is The Flash of Eobard Thawne's time.
Instead of being Iris's nephew like in the comics, he's a distant descendant of Barry and Iris, just as Eobard is a distant descendant of Eddie. He inherited his connection to the Speed Force from Barry and became The Flash in his time. When Wally became too fast for Eobard to defeat, Eobard came up with a Plan B: Travel back and eliminate Wally's ancestor, Barry Allen, thus preventing Wally from ever being born. He tried it on the adult version (see the WMG below about Eobard trying to kill Future!Barry), it failed, so he moved on to 11-year old Barry, with the results we've seen in the show. Eventually, Wally will track Eobard to the present day and come looking for him, teaming up with Team Flash in the process. As for why Thawne wanted to get rid of Wally, the answer is spelled out right here: Barry ends up with Iris and Eddie doesn't, starting a long-standing blood feud between the Thawne family and the Allen-West family. Wouldn't be the first time a war started over a girl.

Wally will take over as the main character when the Cinematic Universe Flash is introduced.
Given what happened with Deadshot, when the films introduce Barry, he will be killed off, but Wally West (who would probably have been introduced before that), will take over as the main character to keep the show going.

Wally will be one of the Alternate Universe Flashes and end up stranded in the main universe ala Powergirl
This will give him his motivation throughout the season as just trying to get home, as well as allowing the writers to bring back Linda without having to worry too much about the characters' ages.

Walter West will be introduced as a Composite Character with Pre-Flashpoint Wally
Since Pre-Flashpoint Wally is a fan-favorite, it seems unlikely that they wouldn't incorporate him. With the multiverse being explored in Season 2, it would be a good way to do so. He will have Walter's name and costume, but Wally's personality.

Wally will be Iris' sibling.
As much as I don't want this to be true because it changes too much of his character, I think there is a chance it could happen. Iris' mother has been out of her life for twenty years, which is long enough to maybe have a kid with someone else, leaving Iris with a half-brother. Or maybe she was pregnant when she dropped out of Iris' life and Wally is also Joe's. Since Wally's actor is only a year or two younger than Barry's, I can seem him being portrayed as a few years shy of twenty.
  • Confirmed, and it looks like Joe is the father.
    • He might be the father. But Iris doesn't want to know, because she doesn't want her dad to know he might have a son he never knew or had a part in raising him.
    • Confirmed in the second season mid-final, Joe is the father.

Wally will not be Kid Flash, but someone else with super speed
This version is confirmed to be Iris's younger brother, he'll likely follow the path of New 52's Daniel West. He was, until Eobard Thawne's reintroduction, the Reverse Flash. Perhaps Francine will die sooner than expected thanks to her broken heart when Iris refused to reconcile. Wally will swear revenge and attains super speed, let's say Zoom will help him get it so that he could help take down the Flash. After what happened with Franchine, it's unlikely he'd go to Iris for noble reasons, especially if their mother dies.

When Wally eventually becomes Kid Flash he'll use the Reverse Flash suit but paint the black parts red
It's revealed that they kept one of his spare suits and why let a good suit go to waste?
  • Or they could paint the yellow parts silver to match the New 52 Wally, but lets accept whatever we get.
    • Post-Rebirth Wally's getting the classic yellow/red outfit, so probably the former.

Wally won't be Kid Flash, but he might have a son who gets that chance

Following the idea of Jimmy Olsen in Smallville. At first it seems Wally is going to be Kid Flash, but he'll die. However, he has a kid with someone before that happens. That son gets named after his father and becomes Kid Flash.

How Wally gets his powers
His turbine engine prototype will explode and that somehow will imbue him with the Speed Force.

Alternative/expanded theory to above
Somehow something will trigger another Mass Empowering Event (possibly the result of them trying to open the breaches again, or even when they close them again in the finale) while Wally is either in Barry's lab or working on his engine (or both; maybe he went to Barry to get help with the project again and was in his lab?) and Wally will, similarly, get struck by lightning and be in a coma. The team, knowing the chances of him waking up with the Speed Force, try to prepare for it, but he wakes up and, like Barry, ends up walking out to figure things out when hi powers start activating. Barry-As-The-Flash tracks him down and tries to help him control it, eventually unmasking to get Wally's focus and trust. Wally will officially join the team as Barry's support in the field/trainee, using a modified second Flash suit. Bonus points if Linda returns and the two are introduced when Wally is looking for Iris when he wakes up.

Another theory
Given the latest events, with Barry losing his speed and Wally being pulled into the main plot after Zoom uses him as a hostage, Barry will overhear Wally talking about his engine and realize that he can use it to generate the energy needed to reconnect himself with the Speed Force. With Barry's help Wally, being let in on the secret, creates the engine and, with Jesse and Harry's help, builds a machine that can imbued a person with the Speed Force. Barry uses the machine but there's a power-leak imbuding all four of them with the energy; Wally is put into a coma while Jesse and Harry can temporarily gain boosts of power but only through concentration, with Harry finding the Speed Formula Thawne had as a means to gain said concentration, allowing the two to help Barry. When Wally wakes up, he'll have the Speed Force too, and the four of them will be able to defeat Zoom.

    The "Man in the Lightning"/ Zoom/Reverse-Flash 

Zoom traveled back in time to kill Barry's mother
Eventually, Barry will go back in time to try to save her. The super-speed battle between him and Zoom created the red and yellow lightning young Barry saw around his mother.
  • And to add to the sense of tragedy and triumph, Barry will get to talk to his mom. It will turn out that his mother's cries of "Don't let him touch you!" were an order to an adult Flash, meaning that his mom knowingly sacrificed her life to save him.
  • This would signify that Barry went back in time to try to stop Zoom, but he elected to save young Barry's life by transporting him away from the house. Which gave Zoom the opportunity to murder Barry's mother.
    • As of "The Man In A Yellow Suit", possible. As noted by Cisco when he saw the fight, Barry generates yellow lightning while Zoom generates red lightning. Young Barry was carried away with yellow lightning when the murder occurred. But, it's possible that the speedster who whisked young Barry may not be Barry from the future. As noted by the theory below, he might be Wally or Bart. But still, it could be Barry from the future.
    • Cisco and Joe recovered overlooked blood at the scene, Cisco confirmed that one of the speedsters was an adult Barry, but the other one wasn't Wells.
    • That's actually true, he wasn't Wells—yet.

The Flash traveled back in time to try to save Barry's mother. But it wasn't Barry Allen.
May have been a different Flash (e.g. Wally West, Bart Allen). The Man in the Yellow Suit heavily hints at there being two speedsters at the time and location of the Murder.

Eddie Thawne will not be Professor Zoom.
Instead of him being Zoom he will be Colbalt Blue and kick off the feud between the Allen and Thawne families.
  • The secret in his past that they've mentioned could very well be his criminal family.
  • This would actually be similar to the kind of Bait-and-Switch the writers pulled in Arrow Season 1. They introduced Tommy Merlyn, Oliver's best friend with a familiar last name that almost guaranteed him turning out to be the villanous archer Merlyn...before revealing eventually that 'Merlyn' the archer was someone else. Its the same deal with Eddie Thawne and Zoom.

There will be a Rapid-Fire Fisticuffs Pummel Duel between Barry and Reverse-Flash
And it will be awesome.

Thawne isn't 'The Man In The Lightning', it's the other Zoom.
Hunter Zolomon's reason for targeting Wally was because he felt that only through great pain and suffering could one become a better hero and so made it his mission to inflict hardship on Wally, so that he would come out of it stronger. Now go back and rewatch the scene where young Barry last sees his mother alive, The Reverse-Flash stops and looks directly at him then takes the half-second or so to take him away... Why would Thawne, who hates the Flash and wants him to suffer, not kill the boy's mother in front of him? No, Hunter revealed himself for a second and then took Barry away so he would be shielded from the sight of his mother's death knowing this hardship would inspire Barry to believe in the weird so that Central City would have a hero mentally ready to accept the idea of other meta-humans and the drive to stop them. Zoom killed Nora to make Barry a hero.
  • Confirmed, albeit with "Hunter's" name being Harrison.

Reverse-Flash interfered with the particle accelerator
If Wells created the particle accelerator so he could empower Barry than the Reverse-Flash could have found out about it and sabotaged the machine to cause more damage than Wells could have foreseen, which also had the side effect of creating several more metahumans than Wells would be familiar with.

Eddie Thawne will become the first Zoom
Pretty self explanatory. But some of the spy-photos revealing the fight between Flash and Zoom have the parts of Zoom's face looking a lot like Eddie's face.
  • Jossed. It's Harrison Wells.

There will be multiple Zooms, the first will look like Eddie but actually be Thaddeus
Going off the above WMG. Seemingly confirmed when close examination of the Reverse Flash in "The Man in the Yellow Suit" shows the Reverse Flash caught in the forcefield is much bulkier and seems to be out to kill Barry as opposed to the taunting of the football field one. Not to mention the fact that the lanky Harrison Well has a Reverse Flash suit but he was beaten nearly to death by the captured one. Even with super speed he couldn't be in two places at once, much less through a forcefield near impervious to super speed.
  • Apparently confirmed in "The Nuclear Man". The blood Cisco and Joe found at the old crime scene was apparently that of the two speedsters: one was an adult Barry but the other wasn't Wells.
    • Jossed, "Tricksters" shows that the other speedster was one Eobard Thawne, who used some form of future technology to transform himself into Wells, after engineering an accident that killed the original Wells's wife.

The Cobalt Blue equivalent will be the first Zoom.
This one would end really well

The Reverse Flash that killed Barry's mom was possessed by Parallax
Sorry but that thing was too freaky to be completely human.

He's going to have years of experience with his powers that Barry doesn't probably has already fought Barry thanks to time-travel, and he's going to beat the crud out of Barry.
  • Judging by some set photos that have been released, this theory may not be that far off.
  • As of "The Man In The Yellow Suit, he did. TWICE.

Reverse Flash will die in his first appearance.
And then, thanks to time-travel, Barry knows that no matter how far in his own time stream he is, he'll never be free of Reverse Flash because Reverse Flash can't die until the Reverse Flash goes back and kill's Barry's mother. And as Reverse Flash's body lies on the ground, we see who he is and know that inevitably, one of our regulars will become him...

Reverse Flash is actually Eobard Thawne from the future.
His backstory would be much the same as his comic counterpart with the exception that someone followed him back in time try and prevent his crimes. Edward Thwane also wonders why the Reverse Flash didn't try to kill him even when looking him direct in the face, possibly avoiding a Grandfather Paradox by killing an ancestor.
  • Confirmed.

Reverse Flash is working with Wells to ensure a Stable Time Loop
In order to keep his future from being erased, Wells needed to have Barry become the Flash. Reverse Flash was chosen to ensure that Barry had a purpose and motive to become a hero by killing his mother while Wells would begin work on the particle accelerator that would ultimately give him his powers.

Eddie Thawne wants the Reverse Flash as much as Barry does...
...because Nora Allen is Eddie's mom. Either Eddie was adopted, or he's Nora's son from before she married Henry. And since he knows this but Barry and the Wests don't, he came to Central City to look over his half-brother, and upon hearing that "man in lightning" is running around town, he begins to think that either the Flash is Nora's killer or is connected to him. This is why Eddie makes fun of Iris's Flash blog but also goes twice to his captain for an Anti-Flash task force before he even encounters the Flash. It also explains why he grabbed Barry for a gym workout after Girder gave them both trouble: he wants to connect with his little brother, even if only a little bit.
  • Secondary to this WMG, Eddie is Reverse Flash, and the cause of his initial feud with the Flash is because of the Flash's attack on him in the crossover episode, and he ends up becoming a Self-Made Orphan when they time travel back in time.

The reveal of the Reverse-Flash will have a case of Identical Grandson
And obvious looking like Eddie, who's full name will be revealed to be Edward Malcolm Thawne.

Eddie will become another Reverse-Flash but also be Cobalt Blue

Eddie will become Reverse-Flash to "protect" Iris from Barry
Due to either jealousy or a misunderstanding he'll believe The Flash is a danger to Iris and so seeks out a way to protect her.

Reverse Flash has Eobard Thawne's motivations played straight.
Thawne wanted Barry to become a better hero. By experiencing tragedy. Here, I see Wells' travelling back through time and messing with the timeline to see if Barry can actually overcome the Crisis of 2024. That's why he keeps looking back at it, to see if at some point, due to his training, the future can be changed.

Both Thawne!Zoom and Zolomon!Zoom were involved in Nora Allen's murder
Both would have motivations (Thawne to tear Barry down, Zolomon because he'd see it as a fit tragedy to shape the Flash). Plus, Zolomon doesn't have true super-speed, only the ability to slow down time to make it seem like he does. His time-slowing abilities means he could get Barry blocks away and be back at the Allen house and make it seem instantaneous.

Time travel allows Harrison to be Reverse-Flash
Harrison can be in two places at the same time because he's the Reverse-Flash, and that version of him is able to travel through his timeline. This stems from merging with the Speed Force (or whatever it's called in the show) and is how 2024 Barry learns to follow Reverse-Flash back in time to become the lightning bolt that hit him in 2014.

Wells and Thawne inspired each other to become Reverse Flash.
Wells used the electric meta's blood to give himself Barry's powers. He wanted the tachyon device from Mercury Labs, and so donned the yellow suit to steal the device to thwart the 2024 crisis while putting the blame on somebody else he knew would garner more focus and controversy. Eddie will eventually have a major grudge with Barry and also somehow inherit superspeed, adapting the Reverse Flash persona to retroactively torment Barry.

One of the Reverse Flashes is a Darker And Edgier Kid Flash / Impulse
Reverse Flash isn't the only speedster to wear yellow. The two Reverse Flashes in the show also seem to be at odds with each other with the bulkier one beating the snot out of Wells and trying to actually kill Barry as opposed to the slender one's taunting. Impulse's MO was traveling back in time to prevent a Bad Future, mix that with This Is Something He Has To Do Himself and Well-Intentioned Extremist...

Reverse-Flash didn't kill Eddie because he is Eddie's descendant
  • This is confirmed.

The other speedster the Reverse-Flash fought at Nora's murder was...
  • A time travelling Barry
    • Confirmed as Barry's blood was found at the scene.
  • Jay Garrick

Eddie Thawne is Harrison Wells
We know that Wells is a time traveller, and that he, to an extent, is concerned for Barry's safety. It's not beyond the realms of conception that Thawne was somehow able to travel back in time (possibly using some appropriated time travel tech created by Cisco or Kaitlyn) and then use his more developed knowledge of physics to become a brilliant scientist. It would raise a question as to what happened to Iris in the future though...
  • Jossed. Wells' real name is Eobard Thawne, and he's Eddie's descendant.

The Reverse-Flash was there to kill Barry, not Nora.
It was the other Reverse-Flash, not the one we know as Harrison Wells. While Harrison is trying to ensure that The Flash becomes the hero who saves the future, this one was trying to make sure his old nemesis never came to be. Luckily, Future!Barry intervened. Unluckily, Nora got caught in the crossfire.
  • Half-right. While Wells is the only Reverse-Flash, in "Out of Time", Wells admits his intention was to kill Barry.

The Reverse-Flash also has an unstable connection to the Speed Force.
Only his is worse as he hasn't been able to treat it the way Wells has. He hasn't appeared much because his speed comes and goes so sporadically that he has to plan his actions carefully but still couldn't resist a chance to go after Barry.

The Reverse-Flash and Harrison Wells will have a showdown.
In front of Barry where both deliver "The Reason You Suck" Speech to each other. One exchange will probably go like this:
Reverse-Flash: You have the same blood on your hands that's on mine.
Wells: Not the blood of innocents.
Reverse-Flash: "By luck only.
  • Considering Wells and the Reverse-Flash are one and the same, this seems unlikely.
    • Though in Season 2, the Earth-2 Wells and the "temporal echo" Reverse-Flash come face-to-face with each other.

There are two Reverse Flashes...And Wells doesn't know it.
The man has access to time travel, or at least knows its possible. He knows about Nora Allen's murder, but thinks he hasn't gotten around to it yet. We're going to get two or three more Wells-and-RF-in-the-same-place scenes, and Wells is going to fake being afraid of Reverse Flash. And then either Cicso is going to mention that the murderer's blood wasn't a match for Wells', or Reverse Flash's mask gets knocked off in front of Wells and it isn't Wells' face underneath. Either way, Wells' reaction will be priceless.

Eddie will perform a Heroic Sacrifice to stop the Reverse Flash
Its pretty inevitable that Eddie is Wells' ancestor, or at the very least is connected to him in such a way that killing him wasn't an option. Most likely, it'll be that Eddie is the show's take on Cobalt Blue, Prof. Zoom's ancestor, only with Adaptational Heroism and a slight name change. Anyway, at some point, Eddie will, near the end of the season, get caught up in all the mess, and be basically stuck in the middle of a battle between Reverse-Flash and others. Like before, he won't kill Eddie, prompting Eddie to keep pushing until Wells reveals the connection. Burdened by this, when Wells/Zoom/RF/whatever tries to kill Iris as he did in the comics, Eddie will, like Tommy in Arrow, save her life and be mortally wounded. This will cause a time paradox of sorts which screws Wells' powers up, giving Barry the upper hand to beat him.
  • Given that in "Grodd Lives" Eobard taunts Eddie by saying that he's the only Thawne that history has forgotten, and otherwise seems to dismiss him as being of little importance, this outcome would be especially ironic.

There were two Reverse Flashes present during the events of "The Man in the Yellow Suit", and one of them was Barry Allen
. He steals the Reverse Flash suit and travels back in time to speak with his past self, so he can deliver some crucial clue that Barry can figure out in the future to defeat the real Reverse Flash.
  • Jossed. The Reverse-Flash who was apparently trapped in the forcefield talking to Harrison Wells was a pre-recorded hologram and Wells was faking having a conversation with him.

Eddie is Harrison's abusive grandfather.
Trailers for newer episodes are teasing that Eddie starts going down a bad path, and seems to lose Iris to Barry and form a grudge. Maybe he grows obsessively bitter, blaming everything on Barry and conditioning his future family to hate a total stranger and credit Barry to every minor problem they have trough emotional and physical abuse.
  • If you're referring to the trailer scene where Eddie shoots the two cops, that's been Jossed. It turns out that it was actually a shapeshifter disguised as Eddie who shot them.

Wells knows that Barry is on to him.
At the end of "Rogue Time", Barry finally becomes suspicious of Wells after the man who told Barry of his suspicions—in the alternate timeline—is "mysteriously" killed. Initially, Barry asks Wells "Hey, do you know what happened to Simon—" before seeing the aforementioned news report and leaving without finishing his sentence. The thing is, Wells isn't stupid. He knows that Barry was about to ask about Simon Stagg but that Barry stopped after seeing the news report.
  • Confirmed as of "The Trap", in fact it seems he anticipated it.

It wasn't Wells who killed Mason Bridge.
There's a brief moment where the Reverse-Flash drops his vocal blurring after killing Mason and speaks with his real voice, which sounds different from the one we usually hear when Wells speaks. Also, this Reverse-Flash seems to have much better command of his speed powers than Wells, who, as we've seen previously, has difficulty maintaining the stability of his speed. That second Reverse-Flash theory isn't looking so crazy all of a sudden. Though this does raise the question of why this RF would want to shut Mason up.

Wells' speed powers are artifically induced.
The reason that his connection to the Speed Force is so choppy is because he didn't come by it naturally. Maybe he found some way to copy the powers of the real Reverse-Flash from his time, but his powers are wearing out from overuse because he isn't really meant to have them. This would also explain why a second Reverse-Flash might have taken an interest, if that theory pans out. Wouldn't you be pissed at the guy who hijacked your powers and took them for a joyride?

The Reverse-Flash is actually a body-surfer.
In "Tricksters", we see in flashbacks that Harrison Wells and Eobard Thawne were two different people, played by Tom Cavanagh and Matt Letscher respectively, until the latter murdered the former and stole his identity. What if Matt Letscher's character was not The Reverse-Flash's original identity either? It may be that "Eobard Thawne" was either the name of that man or The Reverse-Flash's actual birth name (i.e. before he started bodyhopping), but in any case, it is possible that The Reverse-Flash has used the bodyjacking device he carries to go from body to body over the years, and Matt Letscher's character was only the second-most recent.
  • Jossed. When Eddie shot himself to wipe Reverse-Flash out of existence, he reverted to Letscher's form before turning to ash, indicating that that was his true form.

Eobard will escape in the season finale by replacing Eddie.
His device has to be a Chekhov's Gun that will show up later. Since he would be genetically identical to Eddie there would be no paradox if he became his own ancestor.
  • Jossed.

Eobard's transformation is limited
While we know that Eobard used technology to make himself look like Harrison Wells, we do not know if that is permanent. If he can lose the Speed Force connection, why not lost the transformation, it can also explain why he sounded different in "Rogue Time", he's changing back to his original form.

Barry and pals were able to access Wells's secret room without a hitch, with all his stuff in full view, because:
  • Since he's always one step ahead, Wells is just that cocky, and it's All According to Plan anyways.
  • The room responded to Barry's touch since future Barry was the one who created the Gideon AI controlling the room, which Thawne later stole.

Eobard's "temporal echo" was really the Speed Force's attempt to resolve the paradox created by Eddie's death.
  • When Eddie committed Heroic Suicide in Season 1, he erased Eobard's entire family tree from existence, but that also means that the events leading to said Heroic Suicide could never happen, creating an impossible situation. The Speed Force dealt with the paradox by preserving a version of Eobard in the future so that the events of Season 1 could still happen, keeping the current timeline intact.
    • I think that's what they intended to imply. Also, remember that in Eobard's original timeline Barry became the Flash long after 2016, so the timeline have definitely took liberties to preserve itself.

Eobard Thawne's original plan was to kill Barry Allen as a child and take his place.
  • We know from Out of Time that Thawne's original plan was to kill Barry, but how could he do that without creating a gigantic paradox since that would mean there'd be no Flash to inspire him to come back in time? The answer lies in the technology Thawne had that allowed him to kill/replace Harrison Wells. Clearly, Thawne had planned to kill the young Barry, replace him and then grow up to become The Flash.
    • This would also be a nice nod to the original Reverse Flash's motivations in the comics, where Eobard Thawne was a Flash fanboy who tried to emulate his hero to the point of having plastic surgery to look like Barry Allen! Thawne went mad after acquiring speed powers, traveling through time to The Flash Museum, and discovering - from the exhibits - that he was destined to be remembered as The Flash's worst enemy!


The reason that Barry's Time Travel ability works differently in "Out of Time" is because past Barry recognized him
Cisco's analysis of the blood at Nora Allen's murder scene reveals that there were two speedsters present: Reverse-Flash and future Barry, meaning that future Barry was in the same place as his 11 year-old self. However, in "Out Of Time", Barry time travels back one day and briefly encounters his previous self (as seen at the beginning of the episode), then seems to merge with him in a form of Mental Time Travel. How do we account for this discrepancy? Simple: Past Barry seeing and recognizing present Barry created the risk of a paradox, so the universe/Speed Force/whatever-you-choose-to-call-it rectified the situation by merging the two Barrys into one. This didn't happen with future Barry and kid Barry because Future Barry was A) In costume and B) so much older than kid Barry that Kid Barry really had no way to know who he is or recognize him. There was no risk of paradox, thus no Mental Time Travel happened to prevent it.

Details of the "Particle Accelerator in 2020" timeline
  • Thawne-Wells seems to have started the "new age" of metahuman superheroes and supervillains 7 years early (2013 instead of 2020). Meaning everyone who applies is at least 7 years younger than they would have been.
  • The metahumans (and Grodd) in the old timeline had less of a Meta Origin. The 2020 particle accelerator didn't explode, no Mass Empowering Event, but the technology derived from it created metahumans anyway, through lower-key accidents Spider-Man style, and deliberate efforts from people like Gen. Eiling who was no longer working with STAR Labs.
  • In 2014-2015, Cisco, Caitlin, Ronnie and Hartley were still working for Wells and Tess Morgan.
  • Barry's mom never died so his dad was never jailed and he didn't become Joe's ward. He still becomes a CSI due to his nature.
  • The Rogues were metahumans.
  • Actual Harrison Wells interacting with Eiling led to Grodd (here "Gorilla Grodd") breaking free and forming a gang of gorillas which terrorized the city. His position as the 'old master villain' was filled by the Trickster in the changed timeline.
  • As a result of the theft of the centrifuge, the Arrow was instead helped by a young Starling City CSI named Rex Tyler.

Eobard Thawne first attempted his "murder-The-Flash" plan on Future Barry.
When we see Thawne and Future Barry fight at the beginning of "Tricksters", they both come through the same wormhole. Thawne's repeated use of the word "centuries" implies that he is from more than two hundred years in the future, while Cisco's analysis of the blood samples at Nora's murder indicates that Barry does indeed age like everyone else, meaning that he would likely be dead long before Thawne was ever born. Now, if Future Barry and Thawne traveled to the night of Nora's murder from their own respective timelines, then we should have seen two wormholes, not one. Proposed explanation: Thawne went to Future Barry's time first and tried to murder him. When that didn't work, he zipped back to the year 2000 to try and take out 11-year old Barry, preventing The Flash from ever coming into existence. We know the rest: Future Barry gave chase and thwarted the murder attempt, but Nora got caught in the crossfire and died. Future!Barry returned to his time, but Thawne burned up the supply of Speed Force in his cells, leavng him without his speed and Trapped in the Past.
  • Additionally, this Future Barry was not the Barry we know in the show, but the version who became the Flash in 2020 when the real Wells' particle accelerator blew up.

Future Barry will be seen without his mask at some point and will be played by John Wesley Shipp
This will give him a chance to play The Flash one more time. Plus, it would make sense for Barry to grow up to look like his dad.

A Firestorm Spin-Off is in the works
Let's face it, this show has done way too much to set up Firestorm for this not to at least be a possibility: Fusing Ronnie Raymond and Martin Stein together, giving them Playing with Fire powers, having them develop the ability to fuse and de-fuse at will, and even having them move out to Pittsburgh, where Firestorm is from in the comics. This has "future superhero Spin-Off" written all over it.

Cisco's powers will be a direct result of Reverse-Flash's vibration-murder of him in the initial timeline.

If Iris chooses to marry, she will give birth to twins

All of this is leading to a Live-Action version of the Justice League
Independent of the one being formed in the films that is. Gideon nearly namedropping them was Foreshadowing for it. The members will be:

Iris is going to die.
The timeline has already been proven to be changeable. Thawne is going to kill Iris as a final Kick the Dog moment to upset Barry and send Eddie over the edge so he'll turn into Zoom to torment Barry some more, and so the writers can set Barry up with Linda Park.

Caitlin will become Killer Frost in an attempt to defeat Thawne/Wells.
She already knows that speedsters can be defeated by extreme cold, so in a desperate effort to help Barry take down The Reverse Flash, she'll develop a way to give herself ice powers.

The next Arrow/Flash crossover will lead to Ollie changing his name
We know the two will be crossing over soon, and we know that Oliver Queen's life as the Arrow is all but over, and he's going to need a new way to operate as a vigilante after what's happened. We also know that Barry has now seen the future news article, and probably noticed the fact Oliver is referred to as the 'Green Arrow'. As Barry had previously given him a You Are Better Than You Think You Are, he'll probably give him another one after Oliver's recent bout of LOA-induced brainwashing, and during it, when Ollie undoubtedly mentions that 'The Arrow is dead', Barry will probably show him the news article showing that he's going to live and continue, albeit with a different name.
Possible Barry Dialogue: The Arrow? He may be dead, and his story might be over. But the 'Green Arrow?' His story's just about to start. Now, you want to just stay and be some retired, bitter vigilante who failed his city, or do you want to be the hero it needs? Get up Ollie, and go be a hero.
  • Jossed. Oliver changes the name himself, without Barry's influence or seeing the article.

Eddie will try to ensure that Eobard is never born
After surviving his kidnap ordeal by Eobard, he will get a vasectomy to ensure that he never has children, and thus thwart Eobard by essentially erasing him from existence.
  • Confirmed in "Fast Enough", though he goes one better than even that. As in, he shoots himself.

Wells reactivating the particle accelerator
Is part of a gambit to cause another particle accelerator explosion and flood the city with even more Metahumans.

The reason Superman, Batman, Wonder Woman and many other heroes don't seem to exist...
...is because Reverse-Flash has already prevented them from coming into existence. There clearly weren't other public metahumans before the particle accelerator explosion, precluding Superman or any other superheroes existing, yet his reference to a "Man of Steel" comes off as a conscious reference. The Wayne Family is around, but Batman clearly is not based on events with Ra's Al Ghul in Arrow. Reverse-Flash traveled back in time and stopped Joe Chill from killing the Waynes and the Kents from finding Kal-El - or he just killed them - and stopped many of the other heroes from appearing. This could also include Hal Jordan (the reference to him vanishing could as easily be Zoom having killed him as being whisked away by the Guardians to become Green Lantern) and Metamorpho (killing Simon Stagg to prevent the chain of events that would transform Rex Mason). He may have done it to get rid of any major opposition; we know he tried it with Flash, though he failed. Or perhaps, if the show is sticking with the comics interpretation of Zoom once having been a fan of the Flash, he killed them so that they couldn't steal the 'glory' from his hero.
  • Seemingly jossed as of the trailer for Legends of Tomorrow, as it's heavily implied that Vandal Savage actually managed to kill both Superman and Batman.
  • Additionally jossed with the revelation of Earth Thirty-Eight, the home universe of Supergirl, where Superman and implicitly Batman exist. This would suggest that the commonalities on Earth-One, i.e. the references to the Waynes, are just elements shared across Earths without implying they share or shared superheroes, same as Central City exists in Supergirl's world without the Flash.

The Multiverse's set up
  • Earth-0/Prime: 2024 Barry's Earth
  • Earth-1: 2014 Barry's Earth
  • Earth-2: Jay Garrick's Earth. Golden Age version of the heroes exist here or equivalent there of. (Thomas Wayne Batman, Robert Queen Green Arrow)
    • It seems that Earth-2 is the "Evil Universe" with Flash is really Zoom, Killer Frost, Deathstorm, Reverb, and Doctor Light. Earth-3 could possibly be the one with older heroes.
  • Earth-3: Obligatory Evil Universe. Also Four Is Death
  • Earth-4: Successor Universe. Wally West, Kyle Rayner, Connor Hawke.
  • Earth-5: Supergirl's Earth (if not simply combined with Earth-1)
  • Earth-6: Reverse gender equivalent-verse. Jesse Quick version of the Flash exist here.
  • Earth-7: Beyond verse. Danica Williams Flash.
  • Earth 8: The Movie Verse (for the DC Cinematic Universe version of The Flash)
  • Fill the rest in yourselves if you have an idea of course.

Barry's Speed has nothing to do with velocity or running

The Future!Barry that stopped "our" Barry from saving his mother has just come from the Flashpoint Timeline.
  • He knew the damage it could do and stopped his past self from creating that reality. At some point, Cisco will gain greater control of his "Vibe" powers and be able to see into what happened in that timeline.

The timelines that Barry time travels from to Set Right What Once Went Wrong aren't actually erased
  • Rather, they continue to exist, but with no more Barry Allen to protect them, making things go from bad to worse. This means that there is an alternate dimension whereby Barry may have successfully generated a tidal wave to stop Mark Mardon's (or maybe not), but he then disappeared, with Cisco now dead by the Reverse-Flash's hands and Joe seriously injured and captured by Mark—so not only is the situation horrifically dire, but they don't even have their hero to protect them anymore. Similarly, this would also apply to Arrow S 4 E 8 Legends Of Yesterday, whereby Vandal Savage managed to successfully kill all the heroes and wipe out Central City in the process...basically, that universe still exists, but with no heroes, and with Vandal Savage conquering the universe.
    • The season 3 episode "Untouchable" seems to touch on this idea, when Cisco is able to vibe himself into the Flashpoint timeline, which shouldn't exist anymore

A future character who's important to the Flash mythos will be played by Michael Rosenbaum.
It would be a good Casting Gag, seeing as Rosenbaum voiced the Flash in the Justice League series (and it would be similar to how John Wesley Shipp, who plays Henry Allen here, had previously played Barry Allen in the 1990 live-action series and voiced Professor Zoom in Batman: The Brave and the Bold). The most likely outcome is that Rosenbaum will play one of Flash's iconic villains (Mirror Master would be a good choice).

Barry will marry Iris in a future season.
Because, let's face it, it happened in the comics, so I'm sure it will eventually happen here. You can't argue with canon. I'm pretty sure they're going to do it, regardless of how people feel about Patty Spivot.

The season finale of Season 2 will have blue lightning replacing the usual yellow on the title card
Zoom's the main antagonist, has blue lightning. Season 1's finale had the lightning colored Red, and the Arrow crossovers color it green. So it makes sense that the Season 2 finale, which will presumably be the big Zoom showdown, will have blue lightning for the title card.
The Timeline is hopelessly screwy.
And lots of people have been erased a long the way. First Flashback reveals that Speedsters time travel frequently. To the point that when a Time Wraith follows S2 Barry into S1 Wells puts two and two together almost immediately and then explains that it's because Barry was sloppy. Which would imply that speedsters bop around time often enough that not only do these things happen but there are apparently standard practices to minimize the odds. Then we have Rip over on Legends of Tomorrow who made a reference to having seen Men of Steel die and Dark Knights fall, an obvious reference to Batman and Superman. Neither of those beings have been confirmed in the Arrowverse, the closest is a Stealth Cameo in Flash S 1 E 1 of a Waynetech Satellite so it's safe to assume the Bruce does exist though he may or may not be Batman. Superman however is clearly not running around. Any doubt was erased when Flash crossed over to Supergirl and didn't have a clue as to who she was. Now Supergirls come and go, not knowing Cara is hardly the issue. Not recognizing the 'S' shield combined with being shocked aliens exist is a clear indication that Barry has never heard of Superman at all. With Hartley's revival and Eddie Thawn's death we know for certain that screwing around with the past can effect things and worse that we have absolutely no way of knowing how many times it's happened. However we know it's probable that Superman and Batman did exist and Rip saw them prior to whatever events have presumably bumped their debuts down the road. You know until Gotham and Supergirl get cancelled.

The Time Wraiths were once Speedsters
The origin of the Wraiths is quite a mystery, it's not like they were created from nothing. In Flash Back, Eobard Thawne mentioned that in the future he's from, there are multiple speedsters. What if some of them got trapped in the Speed Force and became these Wraiths? Maybe the only way for the Wraiths to survive is to feast on the life force of living speedsters. It's interesting since in the comics, Max Mercury, the infamous Speed Force guru, became one with the Speed Force. That Time Wraith's head had a similar appearance to Max's helmet.
  • Time Wraith is a corrupted version of speedster he came after. Let's think about it very hard. Barry went back in time not only in original timeline, but in changed timeline as well (Team waited his return in changed timeline). Barry-1 came back, but Barry-2 didn't, because there must be only one Barry Allen. So what happened to Barry-2? He became Time Wraith.

Jesse Quick will gain speed powers like in the comics, but will be Put on a Bus.
  • Specifically, she'll go back to Earth-2 to be The Flash of that world. Even if Zoom is defeated, Earth-2 still has a metahuman problem (in fact, it could be argued that one of the few good things Zoom has done is keep metahumans from running rampant over that world, since most of them are under his thumb). With Zoom gone, a new Flash will be needed to protect Earth-2 and it is Jesse Quick's home.

The Barry Allen in this show isn't actually the Doppelganger of the Barry Allen from the 1990's Flash
  • This world's Henry Allen is. This is backed up by the fact that the old show's Barry had an older brother named Jay (the name a double of Henry also had) and that characters from that show have turned up being 24 years older on the new one (Tina McGee, the Trickster, Anthony Bellows). Iris West appeared in the pilot for that show but considering she was white it's safe to assume she's a completely different person who happens to also have that name.

Earth-19 has a Green Lantern and/or a version of Blackest Night.
  • HR, who is from Earth-19, says that Barry's superpower isn't speed, but hope. In Blackest Night, Barry was given a Blue Lantern ring, which is powered by hope.

Repeated time-travel might cause a traveler's changes to stick (and drive them insane)
  • Savitar's existence requires a time loop - his actions in 2017 are meant to lead to his eventual creation. This seems to contradict how time-travel generally works in this show, where going back in time will just create a new independent history...except in the case of the Reverse Flash, whose murder of Nora Allen was similarly set in stone. In fact when Barry tried to stop Reverse Flash, even though Nora Allen's murder was an aberration, attempting to undo it and set history back to how it was meant to be all but shattered the timeline and caused Flashpoint. Savitar's suggested that "the more you (travel through time), the less the rules apply to you"; perhaps that literally means that if a speedster does in fact screw with time enough (as Eobard Thawne is clearly willing to, and how Barry did even before becoming Savitar) they eventually become able to reshape it more effectively as they survive the paradoxes piling up. Of course, given Thawne's instability and belief that he and Flash have some sort of cosmic destiny with one another, and that Savitar went from a hero, however emotionally broken in the wake of Iris' death and his alleged abandonment by Team Flash, to a murderous cult leader literally planning to become a god, perhaps that degree of messing with one's own timeline has a direct impact on mental health...

Jay Garrick is from a universe where the older heroes identities are alternate versions of parents of younger heroes
  • Flash (Jay Garrick) - Henry Allen
  • Black Canary (Dinah Lance) - Dinah Lance
  • Atom (Al Pratt) - David Palmer
  • Mister Terrific (Terry Sloane) - Curtis' father
  • Sandman - Robert Queen
  • Booster Gold - Rip Hunter's father
  • Spectre - Quentin Lance

     Post-season 1, Pre-season 2 theories 

Barry will blame himself for Eddie's death.
He will feel that had he not reneged on his "deal" with Eobard Thawne, Eddie would not have been forced to kill himself to save everyone else.

The real Harrison Wells will return.
If Thawne was never born, then it follows that he never killed the real Wells and took his place, hence why he returns to his original form after Eddie's death.

Alternatively, Stein will take over Wells/Thawne's role as mentor for Team Flash
He showed himself to fit right in with the team during the finale, and it would allow for Ronnie to stay with his new wife while keeping close to Stein. Plus, it would be a nice Actor Allusion to Victor Garber's role in the early seasons of Alias.

Joe will get a new partner
And his name is Hunter Zolomon.
  • Jossed, Joe's new partner is Patty Spivot.
  • And Hunter Zolomon is the Earth-1 version of Jay, and already lives in Central City.

The Season 1 ending directly leads to Barry discovering the Multiverse
He manages to close the wormhole but ends up being transported to an alternate earth in the process. Maybe the first couple of episodes of Season 2 will be set partially on this parallel earth, while on the Prime earth, everyone believes Barry sacrificed himself. Barry will return to his own earth soon, but this will kick off a whole season of adventuring in the Multiverse.
  • Partially confirmed. Grant Gustin has stated that they're exploring the Multiverse in Season 2.

Harrison Wells from an alternate earth/timeline will become a major character
Word of God has said that Tom Cavanagh will remain a series regular in Season 2. Its highly unlikely that they will undo the climactic death (or rather, erasure) of Eobard Thawne so soon. And even if an alternate Eobard Thawne were to appear, its more likely to be a version played by Matt Letscher. Instead, its far more likely that Cavanagh will play an alternate Harrison Wells from another earth or timeline...maybe even the Wells from the original timeline where the particle accelerator was developed in 2020. This will allow Barry to have a new mentor, while at the same time lead to a fair amount of drama, since Harrison's face alone will remind everyone of Thawne and his crimes.
  • Confirmed.

Eddie will return
...albeit not as 'himself' exactly.

We last saw his body falling into the wormhole. There's a very high chance he ends up in another timeline or parallel universe where he's either resurrected or cloned for whatever reason. His experiences in this other reality may leave him changed; he may either become Brainwashed and Crazy because of the traumatic experiences he's been through or through someone else tampering with his mind - if he's a clone he may just be designed with a new personality. He might even get metahuman abilities. Eddie (or his clone) then returns to the Prime Earth as either the new Reverse-Flash, or maybe someone else (Cobalt Blue?) and cause trouble for Barry and the rest of the characters. It would lead to some real emotional tension and drama, especially for Iris.

Barry Allen is his own grandfather.
There is time travel, and his mother says, "You look just like my father."

Eobard Thawne will return in some fashion.
Eddie killed himself to prevent Eobard from ever being born, so this SHOULD mean Deader Than Dead...except when dealing with time travel and multiverses, nothing is off the table of possibilities. From a narrative perspective, there's a lot we still don't know about Eobard Thawne, including why exactly he hates Barry so much; in essence, it feels like his story arc is not yet complete. Thus, to gracefully finish off the narrative, he will have to come back in some manner.
  • This is already pretty much confirmed considering that Tom Cavanagh is confirmed to return (as a regular) in Season 2. Though we don't know the details.

Barry is part of a Stable Time Loop
His future self knew he would be there, since he went through it already, and told his younger self not to due to he being told not to on his trip.
  • Probably Jossed because the 'older' Flash seen when Barry travels back in time is the version of himself from the timeline where the particle accelerator went on in 2020. Why he tried to stop Barry from jumping in is unclear, maybe his life had it's own tribulations and he's learned not to interfere with his own past (and is thus fully aware that what's going down that night will leave the timeline irrevocably altered, and thus shouldn't be changed further).

After Cold and Heatwave join the Legends of Tomorrow Golden Glider will lead a new team of Rogues.
Consisting of herself, Mirror Master, and Weather Wizard.

Tess Morgan will be back.
If the real Harrison Wells was never killed by Eobard Thawne in whatever new timeline emerges in season 2 (as per the WMGs above) then neither was Tess.

Eddie will return as a combination of Cobalt Blue, Pollux and Daniel West
The Eddie we get back will be a clone but his genetic structure was bonded to the cobalt and he'll be able to achieve a blue variant of Daniel West's Reverse Flash form.

Caitlyn will be revealed to have a twin sister named Crystal Frost who will have some of Malcolm Thawne's origin story.
...What are you waiting for? How clear does that have to be?

It will be revealed that Nora died early in the original timeline as well but Eobard's interference made it happen sooner.
Hence why Alternate Future Barry told Younger Present Barry now to stop it from happening. Constants and Variables and all that.

The new rebooted universe will be mostly the same as the one we saw so far with some minor differences
  • Nora's death was no longer tied to the Reverse Flash but a random burglar. Henry is still in jail.
  • Wells and Tess still had a car accident, leaving Wells paralyzed though Tess survived.
  • The particle accelerator was built earlier maybe because Wells thought it could unlock a way to restore his legs. Tess dies as a result.(Finding out about Barry's ability to time travel will lead to Wells becoming a Hunter Zolomon type character.)
    • All seemingly Jossed as it appears nothing significant has changed despite Eobard's erasure

The Arrow will appear but it will be Robert Queen rather than Oliver.
Similar to Flashpoint, in which Batman was Thomas Wayne rather than Bruce Wayne, who was killed by the mugger instead.

"Wendy" will be a Patty Spivot Expy.
If Barry is set to get his own Felicity, then why not go for the blonde, glasses-wearing intelligent Love Interest he has in the comics (specifically New 52 range)? Wendy is stated to work for CCPD and Patty worked for them in the comics alongside Barry.
  • And it seems I was right! Flash details at Comic-Con 2015 confirms it, with Wendy now supposedly actually being Patty Spivot herself with the name and all.

Eddie will be Zoom
Eddie will be a combination of Hunter Zolomon's Zoom and Malcolm Thawne's Cobalt Blue. Hence why the shots of Zoom in the teaser had blue lightning. It's because of Eddie's connection to the blue singularity, combined with the cobalt time capsule. And he'll carry Hunter's resentment about the Flash not saving him.

The actual Big Bad, or at least the Final Boss, will be Killer Frost.
The Comic-Con previews have already announced that Zoom will be the main antagonist of season 2, and he will be introduced outright. However, in a 23-episode season, it is unlikely they will stick with the most obvious villain for the entire run especially given that, for a second season, they can shake up the formula more. Thus, to avoid once again having a speedster as the main antagonist, he will merely be a Disc-One Final Boss, possibly dispatched as early as the mid-season finale. Once again, the show will follow a similar formula to Arrow's second season, in that it will introduce an obvious Big Bad early on only for the real Big Bad to be a former ally that was introduced in the first season. We already know that Caitlin will become Killer Frost this season, and given the emotional weight of this, it will not merely be a Villain of the Week, but something much greater. Similar to Willow in season 6 of Buffy, making a former core team member the Big Bad would be incredibly emotional, and a stark contrast to the first season's Big Bad (who was also part of the core team, but secretly Evil All Along and not a tragic character in the least).

Blue Lightning Flash is Blue Lantern Flash from Blackest Night
Which means that black hole at the end of season one is worse than they thought.

Zoom will be Wally West.
In the comics Zoom is the arch-enemy of Wally West. It would thus be an interesting twist for him here to actually be Wally West.

Some of the characters who were killed in Season 1 will return.
Those who were directly killed or manipulated into being killed by Eobard Thawne (Simon Stagg, Mason Bridge, Girder, etc...) are the most likely candidates, but with him retconned out of the timeline, the potential ripples could alter events in any number of ways.
  • Seemingly Jossed, it seems nothing has changed despite Eobard being erased

Zoom is Eobard Thawne
They just left off the “Professor” part to keep everyone guessing. Season 1 left out plenty of Thawne’s backstory to be explored later. Details such as why he hates Barry and how he met him could be explored this season. Introducing Thawne as Zoom would allow them to further flesh out his character and still maintain some mystery because no one is expecting them to revisit a past villain.
  • Except this theory overlooks the fact that Eobard was Retgoned by Eddie's death. Now, how would they get around that?
    • An alternate reality version of Thawne is always possible. We are going to see the multiverse after all.

    Season 2 Theories 

Possible JSA mentions or even cameos
  • Green Lantern - Hal Jordan has been confirmed to exist over in Arrow so it is quite likely Alan Scott exists as well.
  • Hawkman - Same deal as above but in Earth 2 he is the Thanagarian version and Jay confirms extraterrestrial life in his universe.
  • Sandman - There will be a metahuman from Earth 2 that can turn into sand. Jay may mention there is a connection between that Meta and a friend of his.
  • Doctor Fate or the Spectre - Barry will encounter something based in actual magic rather than metahuman powers and Jay will mention knowing someone related to mysticism on his world. Also Constantine appears in Arrow and he has been seen with Fate's helmet.
  • Hourman - Miraclo has appeared in a way on Arrow and there were plans for an Hourman series.
  • Atom - Ray Palmer on Earth 1 and Atom Smasher from Earth 2, this set up goes without saying.
  • Johnny Thunder - Jay could mention a friend good with lighting as where he learned the trick he is going to teach Barry.
  • Doctor Mid-Nite
  • Starman - The Shade is sent to Earth 1 and Jay mentions a friend he helped to beat Shade.
  • Mr Terrific - There will be a version on Earth 1 and Jay could comment on there being two Mr Terrifics.
  • Wildcat - Same deal as Green Lantern and Hawkman
  • Red Tornado - has a very storied history with both the Justice League and Justice Society on both Earths.
  • Amazing Man - Wells mentioned an Earth 1 version of the character as a casualty of the accelerator explosion so it's possible that there is an Earth 2 version.
  • Steel - one of the several iterations that have served with the Society
  • Star Girl - She and Jay had a very Father/Daughter Relationship in the comics. Plus Courtney could make an appearance in Supergirl given her relationship with Kara in the comics.

Possible Flash enemies that could appear
Feel free to add to this list
  • The Shade - a Jay Garrick enemy that was sent to Earth 1 and wants revenge on the powerless Jay.
  • Doctor Alchemy/Mister Element - Someone who helped Dr Stein with the Firestorm project and got transmuting powers form the accelerator explosion.
    • Appearance confirmed, though anything beyond that hasn't been touched on yet.
  • Mirror Master - Associate of Cold and Glider that gained mirror powers from the accelerator.
    • Appearance confirmed, though anything beyond that hasn't been touched on yet.
  • The Top - Same as Mirror Master but has closer ties to Lisa because they used to date.
  • Blacksmith & Magenta - These two are generally Wally West villains, but then, so is Girder, so it's not impossible.
  • Brother Grimm - would prove a good way to introduce the magic to the Flash series
  • Cicada - also a good way to introduce magic while tying it into the Speed Force
  • Cobalt Blue - Either a Came Back Wrong Eddie, a relative of Eddie looking for revenge (thinking The Flash killed him), or an Eddie from an Alternate Earth.
  • Folded Man
  • Plunder - a vigilante that has Fantastic Racism towards metahumans and is going about tracking them down.
  • Black Flash -Probably not going to do this yet, but who knows.
  • Johnny Quick of Earth 3 - the breaches could connect to more than two worlds.
    • In that same vein, Atomica, Deathstorm, and original counterparts of Green Arrow, Black Canary, and Vibe.
  • Ragdoll

is alive The explosion didn't kill him but instead it sent him to another Earth!

Ronnie has merged with another host
In Earth 2 Namely Lorraine Reilly. Between this, radioactive energy, and the new woman, meet Killer Frost!

The Atom Smasher that Barry faced is from an alternate Earth.
This would explain his Adaptational Villainy and his comment about Zoom's promise to send him "home" if he killed The Flash. He killed the Al Rothstein of this Earth (seen dead earlier in the episode), then went after Barry.
  • Is this even a WMG? I think it was all but stated out loud in the premiere. And with the next episode, it WILL be stated out loud, presumably when Jay explains the Multiverse.

Ronnie Raymond's Heroic Sacrifice is a result of the writers implementing Death of the Hypotenuse to prevent fans who ship Snowbarry from Abandon Shipping.
... and, for that matter, any other ships involving Dr Caitlin Snow paired with anyone other than her now-deceased husband.

...of the Rival Flash from Jay Garrick's Earth, with another speedster, like an alternate world Barry, Savitar, Eddie, or Zoloman.
  • The Rival was effectively the Ur-Example of the Evil Counterpart to a Flash, and his feud with Jay wound up leaving the Rival a Speed Force Ghost. Since Zoom is described as a "Speed Demon," perhaps he's similar. It would also explain his history with Jay Garrick; they're already enemies.
  • Al Rothstein existed on both worlds, thus it's possible that Wells, Barry, Jay, Joe, and the rest do as well. If so, someone like Barry could be the evil Flash of this world. It may even explain Jay being a bit standoffish with Barry; its conceivable that he knows one evil Barry and is trying to accept a good one. alternatively, perhaps its an older Wally West from Jay's world, mixing the Dark Flash with the Rival.

Henry really left because he has cancer or some other disease and needs to seek treatment without telling Barry.
I really hope that this or some other compelling reason is what led to his leaving. Otherwise, it just feels like an Ass Pull used to ensure that Barry can move on from his Season 1 story arc, whilst keeping Henry from changing Team Flash's character dynamic.

The Justice Society will be mentioned or even make an appearance
Older hero from Earth 2? Check. The Crisis all but confirmed to happen? Check. Barry mentioned as being a founding member of Justice League? Big check.
  • Semi-Confirmed. On Earth-2 the mural in the police department that shows the Greek Gods, representing the Justice League, instead shows soldiers and policemen with the words under it being "For a Free and Just Society"

Jay will mention the Green Lantern
He will be talking about the Alan Scott version, describing him as "my best friend with a magic ring."

Killer Frost will be from Earth 2
Word of God says that Caitlin will become Killer Frost but no one said that it was going to be the Caitlin on Earth 1.
  • "The Darkness and The Light" lends some credence to this, since Earth-2's Doctor Light is also Earth-2's Linda Park. Since they think Zoom may be taunting Barry by bringing somebody from his life over to harm him, he could easily go further and bring over somebody who's doppleganger is part of the Flash's inner circle.
  • Also supporting this is that Earth-2!Wells scanned her with a metahuman detector and it gave her a negative reading, meaning that the Particle Accelertor did not turn her into a metahuman like it did Cisco. Unless something else happens to give her superpowers, Killer Frost would have to be her Earth-2 (or from other Earths) counterpart.
  • Confirmed Promos show that the Earth-2 counterpart is Killer Frost

Magic is more prominent on Earth 2
Zoom has been described as a speed "demon" by the creators. This may have been just poetic reference but that word stands out a bit. Monster would have sufficed but the creators may have been subtly hinting at more mystic connotations on Earth 2.

Harrison Wells from Earth-2
Unlike the false Wells (who was Eobard Thawne in Earth-1's world), he truly is a good man and helped stop the singularity there. Somehow Barry will end up meeting him.
  • Confirmed and jossed. Earth-2 Harrison wells isn't evil, but he is a Jerkass.

The dimensional breaches mess with the connection to the Speed Force.
Hence why Zoom sends other metahumans to attack Barry instead of doing the job personally. He doesn't want to risk losing his own speed.

The "War of the America's" Jay's father fought in...
Was a US Civil War that happened much later in his world.

Patty Spivot doesn't just want to fight metahuman criminals
She's a full blown metahuman hater. Consider; she told Joe that he's the only one she knows who fights people with powers. Apparently, she doesn't count the Flash.
  • Jossed. Also, she didn't know the Flash personally, but she did Joe.

Iris's mother is from the future.
She was a drug addict because she was unhappy being stuck in the past. She escape from rehab and return to her time period.

In the season 2 finale, Barry will sacrifice his life to save the world/Central City, although another heroic speedster like Jay Garrick or Wally West will then reset time to save him (possibly not until season 3).

The season begins with Barry feeling like an impostor for being celebrated as a hero when he feels that Eddie and Ronnie, who sacrificed their lives, are the real heroes. Thus, it is fitting that the season will close with Barry finally deciding to live up to his reputation (which again, in his mind, he feels is unearned) when he is somehow put into a situation where the only way to win is for him to perform an action that will have the side effect of killing him—no mere risk of killing him, but 100% known ahead of time.

Of course, this being a cheerful show, one of the other heroic speedsters like Jay Garrick or Wally West will then reverse time and prevent him or anyone else from making a sacrifice while still somehow saving the day—however, this may not happen until the season 3 premiere, possibly.

Zoom will be dispatched roughly two-thirds to three-quarters of the way through the season.
In the Arrow season 4 premiere, we get a flash-forward to six months from that episode's date with Oliver standing in front of a grave, soon being joined by Barry, who says that he couldn't come earlier because he was preoccupied with Zoom. Now, six months from October 7th, 2015 is April 7th, 2016, which is a little over a month before the season finales of both shows. Here, Barry says he couldn't make it to the funeral because he was preoccupied with Zoom. So how come now he suddenly has the free time to visit? Perhaps it's because Zoom has just been defeated at this point. This would also lend credence to my other theory (see above) that Killer Frost will actually be the Final Boss of season 2.

The Reverse-Flash of Earth-2 is the real Harrison Wells rather than Eobard Thawne.
Just like how "The Flash" is a legacy whose true identity is different depending on the universe (Barry in Earth-1 or Jay in Earth-2), so is The Reverse-Flash. In Earth-1, The Reverse-Flash is Eobard Thawne, who travels back in time and impersonates Harrison Wells. In Earth-2, The Reverse-Flash is actually the real Harrison Wells all along. This would mean that, in Earth-1, The Reverse-Flash takes the identity of who he is all along in Earth-2, which would be quite the coincidence...except it's probably not a coincidence...

For instance, maybe he cannot physically travel to Earth-1 without dying or at least losing his powers (much like Jay). It's just that having Zoom not yet encounter the heroes directly (as of three episodes into season 2) feels like a lame excuse by the writers to both pad the season and introduce more characters from the comics, and I want to believe this awkward plotting will have an In-Universe explanation.
  • Zoom wants to be the best. He needs to know he is the best. Rival mentality—if Barry is truly worthy, he can handle the metas being thrown at him. That would be Zoom's cue to come in for the kill, because the satisfaction won't be as great if Barry gets himself killed long before then.
  • Confirmed that there is one, although it's not the one mentioned above. Zoom's ultimate goal isn't to defeat Barry (which he can do whenever he wants) but to steal his speed. He'd prefer that Barry get faster before he does so, since that would mean more speed for him to steal. His sending of Earth-2 villains to fight Barry is just his way of forcing Barry to get faster.

Tina McGee will eventually learn the truth about Harrison Wells.
It's quite tragic that she was Focingbest friends with the real Harrison Wells and only became bitter rivals after Eobard Thawne stole his identity. Eventually, however, she may get closure as she finds out the truth, possibly willingly from Team Flash who will ultimately decide that she deserves to know.

Notice how quick he was to defend her. There's probably more to their relationship.

Zoom will kill Linda
Forcing Earth-2!Linda to take her place. It sets up her and Wally as a Battle Couple.

Kendra Saunders will meet Kendra Munoz-Saunders from Earth 2.
In the comics, E2 Kendra a close friend of Jay Garrick's and a member of the JLA, so it's likely that the less adventurous self will meet her Lara Croft Epxy self from a parallel universe.

There will be a second Particle Accelerator explosion
Earth-2!Wells will try to perfect his mistakes, but will fail. This will lead into Caitlin and Wally developing their powers.

The reason Zoom is sending mooks to kill Barry ...
Is because he is the Earth 2 version of Barry Allen. Back in season one Barry saw a version of himself in prison slacks talking to someone on the phone. It is possible that Wells in his arrogance decided to create his own version of the Flash to counter the rising tide of metahumans but also to rub in the face of Jay that Wells could one up him with a creation superior to the original. Unfortunately this version of Barry has esteem and entitlement issues so it doesn't go well. The thought of another speedster out there, not only that a version of him just as good without his issues enrages Earth-2!Barry. Unfortunately Earth-2!Barry cannot risk physically attacking Earth-1!Barry in case their mutual speed force energies react to one another. Their mutual kinetic frequencies risk destroying them both,so he has to rely on mooks to do the job.
  • Semi-jossed. Zoom's reason for sending mooks to kill Barry is actually to force him to get faster. That way, there will be more speed for him to steal from Barry. Zoom's actual identity remains to be seen.

Cisco is connected to Zoom.
Cisco's Vibe powers seem completely random so far. In Season 1, the only time these powers were used was when Cisco saw HIMSELF being murdered by Dr. Wells in the alternate universe. In Season 2, the powers seem much more useful, being able to show Cisco exactly what he wants to see, such as where the evil metahuman of the week is. Many of Cisco's "vibes" seem like they could be coming out of Zoom's eyes. Even though the time of the visions can vary, Zoom is a speedster, and time is no obstacle for speedsters. Using Season 1's logic for Cisco's powers, Cisco should be seeing things out of the eyes of his counterpart, or Zoom. Another point: Dr. Wells "created" Cisco's powers on Earth-1, while Dr. Wells created Zoom on Earth-2. It's also possible that Zoom's powers evolved out of the Vibe powers (Zoom does seem to vibrate w/ super speed), and in the last episode, Cisco is concerned that his powers could turn him evil like Dr. Wells. Cisco could have used his powers to tap into the Speed Force, and for some reason wants to be the only one with access to it. The reason Zoom's suit is a lot like Barry's suit could be because Zoom has seen things through Earth-1 Cisco's eyes, such as Barry's suit.

Grodd will succeed in creating a race of Meta-Gorillas.
However, they will be peaceful, since Gorillas are naturally nonaggressive. Team Flash will help this new Gorilla race, led by Solovar, to relocate to an uninhabited region to found Gorilla City.

Earth-2 Wells' full name is John Harrison Wells
Since his daughter Jesse is nicknamed "Jesse Quick", his name might be similar to Johnny Quick, her namesake's father in the comics. He just never uses John.

Earth-2 Joe West is the Music Meister
He will be responsible for one amazing Musical Episode. Given his actor's background in music, it would be awesome.
  • Jossed, Earth-2 Joe was killed by Killer Frost

Barry's Come Back Strong with a Super Mode Moment
I have a feeling that this will be a greater version of when Barry lost his speed to Blackout last season. With Grodd, coming back, and that poster for season two, here's how I see it: during the fight with Grodd, where Barry has his speed back and is fighting Grood more evenly, with Patty there, Zoom will come in, and while he holds Barry down, he has Grood try to kill Patty before he finishes off Barry and for the whole city to watch. When Zoom has Barry sees Grood about to telepathically force Patty shoot herself while see suffers from his psychic attack, barry gets so mad that he explodes with lighting and enter some [1] where his whole body radiates with lighting, much to everyone's shock. He then gets Patty out of harm's way, Curb Stomp Grood, and then counter Zoom's moves and powers to the point where Zoom decides to retreat for now.

Patty will die giving birth to Barry's half-metahuman baby, and so will the infant
As You Know, Barry and Patty's relationship is gradually developing. It's therefore not that far-fetched to think that he might eventually knock her up. However, it seems most likely that Barry will eventually end up with Iris, and the writers killing Patty off would prevent Barry from having to awkwardly break up with her as his feelings for Iris resurface, like he did with Linda (with whom he had much less chemistry than he does with Patty). Having Patty die in this way would also continue to fuel the UST fire between Barry and Iris as, after this, he would be too afraid to have sex with Iris lest she suffer the same fate. Not only that, but it is plausible that it would be biologically difficult if not impossible for a normal person like Patty to successfully give birth to a live, healthy half-metahuman baby without dying herself. On a meta-level, the baby would also be likely to die as having him or her live would mess up the status quo too much, plus Barry's Flash duties would lend him very little time to dedicate to being a parent.
  • Jossed, he and Patty broke up because she did not appreciate all the lying.

Patty is Eddie's half-sister
She really wanted to join the metahuman task force to investigate his death and avenge him. She recognized, however, that Joe was busy dealing with the emotional fallout of Eddie's death with both Iris and Barry already, so she said it was her father instead when pressed, so he was more likely to let her join. On a meta-level, both Patty and Eddie are blond partners of Joe who are mostly kind, decent people but stand in the way of Iris and Barry having a relationship. Their last names are different because they only share a mother.
  • Why then did she bother mentioning the Mardon brothers in relation to her "father"'s death?
  • Also, wouldn't several members of the CCPD, including Joe, as well as Iris and Barry, have attended Eddie's funeral and thus met Eddie's closest relatives? We also know that Iris met Eddie's parents whilst he was still alive, and I'm sure that at that meeting, any siblings Eddie had would've been mentioned.

Alternatively, Patty would have been Eobard Thawne's maternal ancestor
In the timeline where Iris eventually married Barry and resulted in Eobard Thawne's existence, Eddie was trying to move on from her, and met a new fellow cop Patty Spivot, who was eager to help him and Joe with the metahumans. He noticed she might have a crush on Barry and warned her that Barry was hung-up on Iris. The two bonded in their fight against metahumans and eventually fell in love and got married, spawning a long line of very blond Thawnes that eventually resulted in the birth of Eobard.

The team will find Eobard Thawne’s research on Blackout and use this against Zoom
In season 1, episode 7, after Blackout was defeated and killed by Barry, Eobard Thawne, as Harrisson Wells, took a DNA sample from Blackout, to try figuring out how he was able to drain Barry's powers. So far, nothing has come from this plotline yet, but it may show up again as a Chekhov's Gun in this season.

Harry will become the show's version of Johnny Quick of Earth-3
He's the father of Jesse Quick, like the normal Johnny Quick, and he's created "Velocity 6", an obvious precursor to Quick's Velocity-9. Desperate to save his daughter, he'll inject himself with the serum, driving himself insane in the process.

Jay will become addicted to Velocity-6
Despite his dislike of it, he'll find that he needs it, since in the comics Velocity 9 is very addictive.

Jay still has his speed.
In Legends of Today, when Harry is shot, Caitlin gives him Velocity 6 in a syringe to give him temporary speed. The color of the substance appears to be clear/blue, and this is seen in a beaker on the desk. However, at the very end, it is shown that Velocity 6 is really yellow/green. This seems to indicate that Jay did NOT take Velocity 6, so he still has his speed, he just can't access it (like Barry in season 1) or he's hiding it (possibly because he's Zoom.)
  • Confirmed

Captain Cold will pull a full Heel–Face Turn in 2x09: Running To Stand Still
This may be the last episode of The Flash before he (and Heat Wave) move to Legends of Tomorrow, where he is one of the main heroes of the show (though based on Arrow's January schedule, The Flash could still air 2x10 two days before Lo T's series premiere). We've already seen somewhat of a sense of honour from him...

Or, at the very least, he'll stop Weather Wizard and The Trickster because ''he'' wants to be the one to take down The Flash himself, and merely used the other two villains to escape from jail and perhaps further other plans.

  • Jossed. He doesn't pull a full Heel–Face Turn. Whilst he does refuse to help the Trickster and Mardon fight the Flash and warns Barry about them, he also refuses to help Barry, breaks into the West house, and threatens both Barry and Iris with his cold gun. It's still uncertain whether or not this is Captain Cold's last The Flash episode before Legends.

The show will eventually delve into the identity politics of metahumans in a similar vein as the mutants of the X-Men universe or the Inhumans (or superpowered people in general) of the Marvel Cinematic Universe

So far, the vast majority of metahumans seen in the Arrowverse have been malicious, with only a handful of exceptions, including The Flash, Plastique, Firestorm, and Vibe. We already have Patty belonging to an "Anti-Metahuman Task Force", and it is treated in the show's universe as a universally good thing...but what if that notion were ultimately subverted? We've already seen from Wade Eiling the dangers of anti-metahuman sentiment, and it would be interesting to explore these themes in greater detail, even if it's practically a cliché by now, particularly given its prevalence in the Marvel Cinematic Universe.

Of course, something like this would probably need a whole season to really breathe, so it probably won't come into play until season 3 at the earliest.
  • Apparently, Trajectory will be coming to frame Flash, which could begin some of this.

Zoom will be defeated with a Phlebotinum Overload
His plan is to get Barry as fast as possible before devouring the speed. Barry will take advantage of this and force all his speed in at once - possibly with a boost from Velocity 6 - to the point that Zoom can't handle it and is destroyed. The even will also cause a Mass Empowering Event that gives the Speed Force to Patty, Wally, and Jesse, as well as repowering Jay.

Eobard Thawne's return and his overall backstory will be strongly tied in to Legends of Tomorrow
We know Eobard Thawne was born in the year 2151, which in the timeline is 15 years before the world becomes so apocalyptic from Vandal Savage's reign of terror that Rip Hunter goes back in time to set in motion the events of Legends of Tomorrow. We also know that Eobard meets Rip Hunter at some point, and both of them somehow possess Gideon. It is possible that the next episode to air as of me typing this—"The Reverse-Flash Returns"—will be used to essentially help promote Legends of Tomorrow (which will have only aired its pilot by then) by connecting their stories together.
  • Jossed. Eobard is a timeline remnant.

Eobard Thawne will know Jay Garrick
It was implied in "Fast Enough" that Eobard Thawne knew Jay Garrick and was in fact afraid of him. Thus, in "The Reverse-Flash Returns", we will see exactly what this connection will be.
  • Alternately, "The Reverse-Flash Returns" may show the first meeting between Jay Garrick and Eobard Thawne, rather than simply explaining their connection.
  • Jossed. They don't meet in this episode.

Part of the reason Patty left Central City and broke up with Barry is because she figured out he was the Flash
While Barry didn't tell her himself, a few events in "Potential Energy" would've clued her in to his secret. The fact that Barry ditches her at the ball, only to save her as the Flash would've raised some suspicions, but when the Turtle flat out tells her the Flash cares for her, she would've figured it out. Part of the reason she's upset with him is that he didn't trust her with his secret, and basically needs some distance and time to come to terms with that.
  • Close. She figures out that he's the Flash shortly after they break up, and the reason they don't get back together is because Barry refuses to admit it.

Jay Garrick and Zoom are two halves of the same person.
Jay Garrick disappears right before Barry fights Zoom, and they are only seen together on Earth-2, in Jay's memory. What if Hunter Zolomon of Earth-2 and Jay Garrick are two personalities fighting within one head? The reason Jay Garrick doesn't have his speed is because Zoom is blocking it, having stolen it. Every other Earth-2 counterpart has had the same name, so why not Jay? If Hunter Zolomon is one of his personalities, then this pattern still fits. Jay's personality is "dying" because Zoom is so much more powerful, but if they can beat Zoom, Jay can be saved.
  • Jossed (maybe) as of "Escape From Earth 2"
  • Unjossed by "King Shark" and the revelation that Jay is Zoom. This actually seems even more likely given the episode "Trajectory" and the revelation that V-9 can create another personality.
  • Kinda jossed by "Versus Zoom", although there is the bit where Jay's eyes go black...
    • Word of God says they'd never make Jay Garrick a villain. So, E2 Hunter may have stolen The Real Jay's identity as both a civilian and the Flash, and Real Jay may not even look like Teddy Sears.

Iris of Earth-2 is Iris West-Allen
Iris may very well soon die on Earth-1, as evidenced by the trailer. If she dies, then she could be replaced by her Earth-2 counterpart. But what if, on Earth-2, Iris's parents were killed instead of Barry's? Iris would go to live with the Allens, and perhaps she added Allen onto her name out of respect/gratitude. When she comes to Earth-1, she could replace Iris and possibly get together with Barry, but still allowing Iris West-Allen to write the newspaper article.
  • Possibly Jossed; some Pics from the Earth-2 episode has both Earth-2 Iris and Earth-2 Barry watching Earth-2 Joe finishing his jazz set. There is another pic showing her with a vest and gun. It is possible in this Earth Joe is a lounge singer and Iris became a cop.
  • Actually confirmed. In Earth-2, Iris became a cop and married Barry, though that Joe doesn't like that Barry because he feels like Barry spurred Iris to put herself in harm's way with her job. (The feelings are mutual, surprisingly.) The Earth-1 Iris also survives what was a fairly minor injury to begin with, so no parallel Earth switcheroos here for Iris.
  • Still Jossed , Iris parents was never killed and she was never adopted by the Allens. Also her name in Earth-2 is Detective West , and not Detective West-Allen.

Cisco didn't start to disappear in "The Reverse-Flash Returns" because he was dying.
  • If you think about it, there's no logical reason why Eobard never traveling back to Barry's time should result in Cisco's death. While Season 1 Eobard did mention that he saved Cisco from some terrible fate, it's never specified that this meant death. However, Eobard was the one who gave Cisco the job at STAR Labs; without him, Cisco wouldn't have been there during the particle accelerator explosion, which means he would have no reason to be there in the present day. This is why he disappears.

Reason why Bruce, Diana and Hal are on Earth-2 Barry's speed-dial
There's been a lot of speculation about how and why the names of Batman, Wonder Woman and Green Lantern would be on the phone of a couple of CCPD officers (given that this Barry isn't the Flash). Rule of Cool notwithstanding, here are a few reasons why those names logically could be there-

Bruce: Maybe Bruce is Batman on Earth-2. He teamed up with Detective Iris West-Allen on a case at some point (either when he visited Central City or she visited Gotham) and they became close, trusted allies... close enough that Iris knows his true identity and has him on her speed-dial.
  • Alternatively, Bruce Wayne once visited Central City in his capacity as a billionaire industrialist/philanthropist and Iris saved his life when an attempt was made on him (or helped him out, in her official capacity) in some other way, which led to them becoming friends.

Hal: He's a close friend of Barry's, possibly his best friend. Either a test pilot or, in a Earth-2 twist, is still in the military or some kind of law enforcement (maybe ARGUS). If the latter, then it might explain how he and Barry met.

Diana: If Atlantis exists on Earth 2, it isn't that much of a stretch to assume that Themyscera might exist as well. Diana could have visited Central City once as Ambassador to Man's World...or alternatively, she might be active as Wonder Woman and come there on a mission. While there she befriended Barry and/or Iris.
  • Alternatively, maybe the Diana that Barry and Iris know is the 'original' Diana Prince... the real woman who's identity Princess Diana assumed, in the classic Golden/Silver Age comics.

Deathstorm returns.
He will return as a zombie with Martin in charge. Like the Martin Stein Deathstorm.

Earth-1 Caitlin will still become Killer Frost.
A few Earth-2 counterparts have the same powers as their Earth-1 selves, and Cisco's meta ability was dormant for a while. Maybe Caitlin has one that needs a jumpstart.

Jay Garrick isn't dead
At the end of "Escape From Earth-2", Zoom vibrates his hand through Jay's chest, and drags him back to Earth-2. In the following episode, we see Zoom carrying Jay's lifeless body. However, Jay may just be unconscious or comatose, as Zoom's vibrating hand may have missed some vital organs, likely intentionally.
  • It's... {{Timey-Wimey Ball complicated...}}
    • Confirmed, in a... complicated way. The person Team Flash knew as "Jay" was Hunter Zolomon, Zoom, the whole time. The person they saw die was a Time Remnant of Zoom's, whom he convinced to provide an alibi for himself after Barry decided to go to Earth 2. Word of God also says that "they'd never make Jay Garrick a villain", so there may be another, Real Jay, who had his identity stolen by Zoom long ago.

Reverb is still alive
A supervillain with powers centered around vibrations, killed by a vibrating hand. It's not too far-fetched to say that he found a way to survive and play dead before escaping.

"Jay Garrick" is Earth-2's version of Everyman.
  • Zoom and Jay Garrick were in the two distinctly different places when Zoom put a vibrating hand through Jay's chest. We know speedsters can create speed mirages, but by all appearances, these mirages don't actually have physical bodies, which would mean that Zoom could not physically interact with one the way he did with "Jay's" lifeless form. Also, Zoom wouldn't consider the loss of such a mirage a "complication", since he could just make another one. So how is what we saw possible? Doom Zoom and "Jay" happen to just be twins? Maybe, but here's another explanation: "Jay" is Everyman from Earth-2 and Zoom forced him into service the way he did to other metahumans. However, his role was different. Zoom wanted to be able to travel to Earth-1 and spy on the team without them knowing who he was. What better way to gain their trust than to pose as another Flash? He went to Earth-1, called himself Jay Garrick, and told them a made-up story about how he'd lost his speed fighting Zoom. But of course, he couldn't be on Earth-1 all the time or he couldn't control the population of Earth-2, so when Zoom needed to be elsewhere, he had to enlist a body-double to be "Jay." Enter the Everyman of Earth-2, the ultimate stand-in.

The Time Masters created the Time Wraiths and lost control of them.
It's never explained where the Time Wraiths come from, only that they try to kill speedsters who screw with timeline and that nobody knows now to beat them. Considering that protecting the timeline is the stated goal of the Time Masters, it would make sense if at some point they ran into a speedster screwing with time (probably Thawne) and, having trouble beating him, they created an experimental creature(s) to hunt him down. Unfortunately they probably lost control of and it now indiscriminately hunts down any speedster altering time, even for benevolent reasons.

Jossed: Zoom confirms that Time Wraiths are agents of The Speed Force, which would also explain why the Time Masters don't seem to have any issues with them.

Jay Garrick is not just an alias, but a stolen identity
Word of God from Berlanti says that the writers "would never make Jay Garrick a baddie, keep watching". Per 2x19, the person Team Flash knew as "Jay" was confirmed to be Earth 2 Hunter Zolomon, Zoom, who manipulated them the whole season. Hunter Zolomon posed as both Flash and Zoom "to give people hope, so he could take it away from them". However, Jay Garrick might have been a real person (that may not look like Teddy Sears, at all), that Hunter stole an identity from. As for why does nobody recognize that "Jay Garrick" doesn't look like the real deal? Well, E2 Hunter is a serial killer - he could have murdered all friends and relatives of the Real Jay, then put Real Jay into the Iron Mask and a speedster cage.
  • Confirmed

Earth-2 Harrison Wells will become, or is Professor Zoom

Earth 1 Wellsobard was never called "Professor Zoom", only "Reverse-Flash". Seems like a waste to not use such an iconic nickname. Maybe Earth 2 Wells will be the one to kill Zoom, modifying himself to become a metahuman, on his own, to "rip that smug smile from [Zoom's] face". Thus, unlike the comics, where Professor Zoom is referred to as both Zoom and Reverse Flash, the show will have all three names as separate identities. I can imagine such a finale, delivered by Wells: "In a way, Hunter, I too, am Zoom... [headshank] But I am also a Professor"
  • Jossed

Wally and Jessie are now speedsters.
They got super speed from the dark matter wave that hit them.
  • The Runaway Dinosaur lends some credence to this theory. Jessie briefly went into a coma, only for Barry to awaken her, with the sole explanation of "speed force." This definitely seems to indicate that Jessie is a speedster. As for Wally, when Joe was testing him, the coffee cup slowed down a tiny bit from Wally's perspective. It's not a lot, but enough to suggest that he has super speed.
    • In addition, it's noted that when they're recreating what happened to Barry the first time, they made sure to have the right chemicals in his system - as the dark matter went through Barry before it hit Wally and Jesse, that could lend itself to specifically making speedsters instead of random meta powers.

What will happen in the finale...
Barry will have Zoom at his mercy, his one chance to kill him for good. Zoom even demands that he finish the job. But Barry just won't go through with it. No matter how much he hates Zoom for killing his father, he is no cold-blooded killer. Proving that Barry and Zoom are nothing alike. Which will piss Zoom off so much that he'll try to destroy Earth-1 rather than admit he's wrong about everything.

    Zoom's Identity 
  • Zoom is Wells' daughter, Jessie "Quick."
    • Now officially Jossed.
  • Zoom is Earth-2 Barry and the true Evil Counterpart to our Flash. Possibly hinted at in Season 2 Episode 2 where they mention that Barry on an alternate Earth could be doing something completely different. From a more meta perspective, the season so far seems to resolve around evil counterparts of various people being brought to central city to kill the Flash, so it might make sense for the Big Bad to be the Evil Counterpart of the main protagonist.
    • Another point in the favor of this theory is that in one of the promos for Season 2, Barry is seen with BLUE lightning instead of the usual yellow. The fact that he uses (or will be able to use) the same color of lightning as Zoom has to be important.
    • Also worth noting is that, in The Flash Annual #3, "Slip," there is a Barry Allen, wearing a dark suit and emitting blue lightning, who comes from twenty years in the future, having failed to prevent the death of Wally and a spine injury suffered by Iris in a car accident. Guilt-ridden, he decides to use his speed to go back in time and kill his past self so that none of this will come to pass. Season 2 could very well be an adaptation of this story.
    • Also noteworthy is that in the previews for "The Darkness and the Light," Wells-2 says that he created Zoom, much like Eobard created The Flash in Season 1.
    • Furthermore, as demonstrated by Atom Smasher and Doctor Light, the Earth-2 metahumans brought to Earth-1 are driven to kill their counterparts. Zoom's overarching goal is to kill Barry, so...
    • After beating Barry near to death in their fight in "Enter Zoom", he refers to himself as "The Fastest Man Alive."
    • After defeating Barry, Zoom drags him all over town to publicly humiliate him, but only removes his mask when he gets to STAR Labs... in front of people who already know who Barry is. Maybe it's nothing, or maybe Zoom doesn't want Barry Allen's face associated with a speedster. If he really is Earth-2 Barry, he could be protecting his own identity, rather than caring about our Barry.
    • It should also be noted that he didn't fall for the bait (Linda as Doctor Light) that Barry laid for him, specifically because it's something he would do.
    • Jossed. We get to see Earth-2 Barry in "Welcome to Earth-2" and he's not a metahuman at all, much less Zoom.
  • The Barry of Season 2 is Zoom himself and the Barry Allen of Season 1 is stuck in the Speed Force. The giving of the handkerchief, Barry's attitude towards Jay, his killing, pushing away of others, and how he feels off all seem to point to something might be different for our Barry.
    • Jossed
  • Zoom is Cisco from Earth-2. When Cisco touched the sand in "Flash of Two Worlds," he saw into the villain's lair, a place it's likely that only Zoom could be. Also, Zoom is shown to be able to travel between dimensions, something no normal speedster has been able to do yet. This could be a side effect of vibrating powers, as could super speed. Plus, having Cisco and Caitlin be the two villains would be a power pairing.
    • Later episodes establish that when Cisco vibes he can additionally scope out places he physically has not been to, and Zoom is simply using the breaches to cross dimensions like the other Earth-2 metahumans. Also, the Cisco of Earth-2, Reverb, was killed by Zoom in "Welcome to Earth-2" (in the exact same manner as the Reverse-Flash killed Cisco, no less) for trying to usurp him and, more importantly, not following the order to keep Barry unharmed, so unless it was another speed mirage trick like the one the Reverse-Flash used, this one is all but Jossed.
    • Definitely Jossed as of "King Shark."
  • Zoom is Patty Spivot. She first showed up with remarkably convenient timing in regards to the villains from Earth-2, said that she's been on the force seven months, which would be around the same time frame as the initial wormhole, and she's obsessed with getting onto the metahuman task force (i.e. closer to the Flash). Not to mention that when Sand Demon captured her, she almost seemed to be egging him on, getting him even more eager to take on the Flash. The Zoom costume could easily mask her size and voice, especially since it's been explicitly described as "demonic" by the producers.
    • Jossed, she was seen in the same room as Zoom.
      • So was Harrison Wells with the Reverse-Flash back in Season 1; speedsters are good at that little "being in two places at once" trick.
      • But they were in the same room the whole time. Patty was in the room before Zoom showed up and remained there after he let.
      • It could simply mean she's that fast.
      • The same happened with Wells and the Reverse-Flash — Wells was in his wheelchair, after the Reverse-Flash hologram was triggered he turned up as the Reverse-Flash, knocked some people down (including, apparently, Wells) and then left again.
      • Jossed
  • Edward Clariss
    • Jossed
  • Eddie Thawne
    • Possible proof: In "Enter Zoom," Zoom laughs off Barry's taunt that Zoom wants to be a hero by saying "heroes die." Who'd know that better than a guy who already pulled a Heroic Sacrifice?
    • The fact that Eobard Thawne is returning leads credence to this theory also. Although it's possible Eobard's from Earth-2 now because Eddie has crossed worlds.
    • Sure, Hunter Zolomon exists in this universe, but who's been fulfilling his traditional role as the young cop who befriended the Flash's alter ego? Basically, this Troper believes that Eddie has always been the show's answer to Hunter Zolomon since the beginning, his eventual transformation into Zoom included; meanwhile, the Zolomon that is Jay's doppelganger is no more than a red herring. And how does he transform into Zoom, you ask? Well, Eddie's body being sucked into the singularity in the Season 1 finale can't be highlighted for no reason at all...
      • Jossed
      • Additionally, the man in the iron mask that Zoom holds captive in his lair might be Earth-2's Eddie. We get to see that he has blond hair, and Zoom must have a good reason for going to such extreme to keep the man's identity unknown.
  • Johnny Quick of Earth-3
    • Jossed unless Earth-3 Jay Garrick goes by Johnny Quick.
  • Black Flash
    • The dark-colored suit and desire to become the only speedster could be re-imaginings of the Black Flash's costume and its role as an aspect of death for those connected to the Speed Force, but considering there was a storyline shortly after Barry's return in the comics where Zoom created a Negative Speed Force and killed the Black Flash, forcing Barry to take up its mantle in the process for a time, Zoom's probably not meant to be the Black Flash unless this somehow ties into the above "Zoom is Earth-2 Barry" theory (which would make Zoom a fairly convoluted three-way Composite Character between Barry, Hunter Zolomon, and the Black Flash).
      • The Season 2 finale heavily implies that Zoom will indeed become the Black Flash. Confirmed as of S2 of Legends of Tomorrow, where it turns out Zoom is now the Black Flash and is tasked with chasing down the time remnant of Eobard Thawne.
  • Future Barry
    • Jossed unless Future Barry looks like Teddy Sears
  • A puppet telepathically controlled by Grodd
  • The New 52 Reverse-Flash
    • Given the revelation that Iris' mother had a son, who might turn out to be Daniel West, this seems very likely.
    • Jossed
  • Cobalt Blue
    • Jossed
  • Bart Allen
    • Jossed
  • Henry Allen of Earth-2
    • Case in point, Zoom's eyes and head shape looks familiar... Anyway, if he's not Henry Allen's Evil Twin, he'll likely be the adaptation of the Future!Barry Allen from the New 52 (I think the one already mentioned above) who went mad after failing to save Wally. Having the actor of a character's father also portray him in his elder years is not unheard of. Plus, it'll be awesome to see John Wesley Shipp in a (different, but still) Flash costume again and dish it out with his successor.
      • That would explain why they had Henry move away from Central City: so, come the reveal, the audience won't be confused by two different characters (Henry and Future!Barry) played by the same actor.
    • Alternatively, Henry Allen lost his wife and son in Earth-2. Explains why Zoom did not kill Barry. Would explain the awkwardness and emotional detachment when he returned.
      • In "Welcome to Earth-2", it turns out that Nora is still alive and is currently on vacation in Atlantis with Henry, which rules this particular train of thought regarding Henry = Zoom. (Unless we're going with speed mirages again, or Henry is zooming back and forth between Central City and Atlantis. Both are unlikely, but not impossible.)
    • Jossed
  • Eddie Thawne of Earth-2
  • Hunter Zolomon, as in the comics. A man who somehow was transformed into Zoom by the Harrison Wells of Earth-2.
    • Confirmed, details aside
  • Earth-2's version of Farooq Gibran. In his debut episode, a big deal was made out of his ability to drain Barry's speed, with Eobard even drawing his blood in hopes of figuring out how he did it, but nothing came of it in Season 1. This could have been a subtle foreshadow for the reveal that Earth-2's version of Farooq is actually Zoom. The particle accelerator still gave him his Blackout abilities, but he managed to not only drain the Speed Force from speedsters, but access it himself and use their Super Speed. This is why he's really going after speedsters: He doesn't just want to be the only speedster, he's doing this to make himself faster.
  • Earth-1 Barry Allen... The one that traveled back in time to prevent the Reverse-Flash from killing his younger self. By telling "our" Flash not to interfere with the event without knowing why "our" Flash went here in the first place, he managed to destroy his timeline and somehow ended in Earth-2. It would explain why he's so much stronger than Season 2 Barry: He has way more experience.
  • Jay Garrick. See WMG above about how Jay still has his speed.
    • He also disappeared right before the fight with Zoom. Where did he go?
    • Additionally, he and Zoom are never seen together in Season 2, except when Jay explains how he emerged in Earth-1. If he were Zoom, and therefore was lying, then he probably killed the real Jay Garrick of Earth-2.
    • Following the reveal that the "Jay Garrick" of Earth-1 is named "Hunter Zolomon" (Zoom in the comics), it may well be that Jay-2's real name is Hunter Zolomon, since no other character has had different names on the different Earths.
    • Another possible hint is how Jay mentions to Caitlin in "Welcome to Earth-2" that he wasn't satisfied with being the Fastest Man Alive and looked into ways to increase his speed, much like how Zoom wants the Speed Force all to himself. Of course, Jay then reveals that taking Velocity-6 was what actually stole his speed, so it's up to the viewer to decide if that's the truth or a matter of misdirection.
      • Jossed unless time travel is involved. Jay and Zoom were in different universes at the same time while the Speed Cannon was damaged.
      • Word of God is that the Jay who was interacting with the team all season (except for the one who was killed by Zoom) was indeed Zoom, and he was therefore traveling between Earth-1 and Earth-2 before the Speed Cannon was even built.
    • Confirmed AND Jossed. The man the team knew as "Jay Garrick" was indeed Zoom the whole time, manipulating them, and a "Jay" that he killed was a Time Remnant of Zoom, much like Eobard's Time Remnant. However, Word of God from Berlanti says that they would never really make Jay Garrick a villain, so we have to "keep watching". The Real Jay Garrick may have been a completely differently-looking person that "Our Jay" stole his identity from.
  • A future version of Jay Garrick
    • The present version of Jay is as heroic as he says he is. However, before the portal to Earth-1 was opened, he always considered himself to be the fastest man alive. Realizing there other speedsters much faster than he is will make him become more and more jealous, and in the future he will take more and more of the Velocity drug to become as fast as Barry, Wally, Jesse, etc. However, the usage of the drug will have a corrupting effect on both his personality and physique, and he will become Zoom. At this point he is fast enough to travel back in time, so he travels back to a point where the portals are about to open but Barry hasn't yet reached his full potential, and other speedsters (Wally, Jesse) haven't even manifested their powers yet. This makes defeating them and stealing their speed much easier than it would be in time period Zoom comes from, where they are much more powerful.
    • If Zoom is future Jay, they can both still appear at the same time, as they did in "Escape from Earth-2".
    • This also explains why the man in the iron mask uses the tapping code to spell the word "Jay" to Barry in that same episode. He was trying to tell Barry who Zoom really is.
    • After The Reveal in the latest episode, we now know he's most likely some version of Jay. But Zoom's comment seems to support the theory he's a future Jay. He says "this is a complication", because he obviously didn't meant to hurt the past version of him, he just couldn't see who he was attacking through the breach. Either Jay isn't fully dead yet, or Zoom killing his own past self hasn't for some reason created a similar paradox effect as Eddie killing himself did.
    • Or the Jay interacting with Team Flash could a Jay from the future,trying to atone for the terrible things he had done as Zoom and stop himself from taking Barry's speed. This could explain why when Zoom kills him, he isn't erased from existence.
      • Confirmed, but the time traveling shenanigans are relevant only for one thing: Zoom traveled in time to meet his Time Remnant, whom he convinced to help him provide an alibi for being on both Earths at once after Barry decided to go to Earth-2. E2 Hunter Zolomon donned the identity of both "Jay Garrick the Flash" and "Zoom" to "give people hope, so he could take it away from them". However, Word of God from Berlanti implies that they'd never make Jay Garrick a villain, so we may not have seen how the Real Jay looks like, yet.
  • Hunter Zolomon of Earth-2, another, stronger personality within Jay Garrick's head.
    • Jossed... maybe?
    • It's E2 Hunter Zolomon, but "Jay Garrick" is but an alias he either created, or an identity he stole from somebody.
  • Wally West. Zoom is shown to have a drug-like addiction to the Speed Force, which is somewhat similar to Wally's deep seated attraction to fast vehicles and racing. The lack of backstory for Zoom would also make sense if they were the same character; Wally's plot would serve as that backstory. Also, Wally's actor could pass for a younger version of Tony Todd, if they chose to use Zoom's voice actor as his actual actor (though apparently the producers have said that Todd is only being used for Zoom's voice).
    • Wally being Zoom might provide an additional motive for Zoom killing Deathstorm in "Welcome to Earth-2", since Deathstorm killed his father
    • Jossed... maybe?
  • Hunter Zolomon is a Red Herring.
  • Zoom is Jay's speed. As a side effect of Velocity-6, Jay's speed spit off into a separate entity, along with Jay's desire to be faster. So when Jay said Zoom stole his speed, he was right, he just doesn't know it.
  • Following the latest reveal, he's Hunter Zolomon...of Earth 1...and the future.
    • Zoom in the comics works via messing with time itself, with time travel as one of many abilities. Likely, at some point in the future, Barry and Team Flash will work with E1's Hunter (maybe he's a cop and becomes Jay's new partner, maybe Caitlin seeks him out as a means to deal with Jay's death, whatevs), and after a while becomes close enough to be trusted by the team with Barry's ID, but during it he gets injured somehow (maybe, in a twist of irony, by Zoom himself), and, when they refuse to use any means to help him recover, he goes behind their backs and does something that grants him powers (maybe he triggers the Particle Accelerator, causing another Mass Empowering Event that also grants Wally and Caitlin metahuman powers) and also re-opens the breaches, turning him into Zoom. Realizing the irony, he battles the Flash and during the fight they end up hurtling back through time-and-space, ending up in Earth 2's original Particle Accelerator event. During the fight Barry gets tossed back to the prsent, but Hunter goes on to become Zoom.
      • Adding to this, Zoom wears a modified version of the E1 Flash suit, despite the fact Jay wears a different suit and has no reason why it should look like that.
    • Jossed. He's not Jay's speed, he's Hunter Zolomon from Earth 2, who pretended to be Jay Garrick the whole time.
  • Alternative theory: He's Hunter Zolomon of Earth 2, instead.
    • Contrary to Jay's claim, Hunter of Earth 1 isn't his counterpart, but that of his brother, who was given up at birth and raised by the Zolomons. At some point, Jay and him found each other and reconnected (though Hunter retained resentment towards him for not being abandoned), and when Jay became the Flash, Hunter was instead left in a coma an didn't awake for some time (which fuelled Jay's resentment of Wells), and when he did, he had powers similar to Jay's. His resentment for his brother lead to him becoming his Reverse-Flash, Zoom. He's since tried to ruin everything Jay stood for, hunting him as much as he could and terrorizing the city.
      • And, adding to this, the man in the iron mask is Jay's father (note, the man appears quite old, if you look at his hands thy appear aged), Jay Garrick Sr, who Zoom kidnapped and punished as a means of gaining revenge for being abandoned. When freed, he'll explain all the details about this and, in order to fight Zoom, he'll take Velocity 9 like his son did, and take up his mantle of The Flash to get justice for his son, becoming a more typical version of Jay Garrick classic (being an older man).
    • The Twin Theory is Jossed, but the person Team Flash knew as "Jay" was Hunter Zolomon, Zoom, the whole time.
  • Another alternative theory: Zoom is Jay Garrick's Split Personality.
    • We've seen that when Eliza Harmon took Velocity-9, she developed an alternate, evil personality called Trajectory who is addicted to super-speed. In the same way, Jay took Velocity-9 and developed his own alternate personality: the evil speedster Zoom. The difference is that while Eliza is aware of Trajectory, Jay doesn't know what's going on.
    • Jossed. E2 Hunter Zolomon, the person Team Flash knew as "Jay" knew exactly what was going on, and even convinced one of his time-traveling remnants to help him provide an alibi for being on both Earths.
Zoom, Jay Garrick, and the Man in the Mask are all the same person at different points in their timeline.
Time travel is possible in Earth 1, and the science and technology of Earth 2 appears slightly more advanced at the same point in time, so it's possible that time travel is easier for residents of Earth 2. This is also why Zoom comments that killing/incapacitating Jay "complicates things."
  • It's... complicated. "Jay" was Zoom all along. When Barry decided to go to Earth Two, Zoom understood that he won't be able to appear on both Earths at the same time. He still tried, but, when it was time to finally confront Barry and the gang, while "Jay" was supposed to be sleeping, Zoom did a time travel trick, contacted a time remnant of his own, and convinced him to die before the eyes of Team Flash, giving Barry motivation to avenge "Jay" and increase his speed. "The complication" referred to the breach being closed, as without a Vibe/Reverb of his own Zoom could not reopen it to Earth One. Man in the Iron Mask is the real Jay Garrick, but he's a separate person altogether and doesn't even look the same.

Zoom is Jay Garrick from Earth-3
"King Shark" revealed that Zoom is some version of Jay Garrick beneath his mask. Given that we have Earth-2, is it that much of a stretch to say he's from Earth-3?
  • To add to this, the final battle between Barry and Zoom!Jay could take them to Earth-3, where Barry will get arrested as Johnny Quick by Officers Snart and Rory. On his way home, he will take a detour through National City.
    • The detour bit is jossed, the National City tour takes place in Episode 18.
    • Jossed. He's Hunter Zolomon from Earth-2, who took on the identity of both Zoom and Flash "to give people hope, so he could take it away from them".
      • However, Jay Garrick, the real speedster that Zoom stole his name from, is indeed from Earth Three.

Zoom is Jay's twin brother
In Earth-2, they were separated at birth. The reason why Jay could only find Hunter was because Earth-1 Jay died at birth.
  • Jossed.

    Earth-2's Arrow 
An episode will be devoted to the Oliver Queen of Earth-2 — only in that world:
  • He's a rather different man. His parents were killed by a mugger when he was young, and he's always had this weird connection to bats...
  • Oliver died on the island in Earth-2. Alternative identities of the Arrow:
    • Robert Queen
      • Confirmed as of S2E6 "Enter Zoom", although Robert apparently never moved past The Hood. This effectively josses everything else in this folder.
    • Slade
    • Tommy
    • Sara
    • Shado
    • Thea
  • Oliver fully embraced the Al Sah-Him identity and is the leader of the League of Assassins.
  • Oliver is more of an adventurer, The Cape right from the very beginning, who fights crime because it's more thrilling and purposeful than being a Rich Idiot with No Day Job or running his company. Pretty much what Green Arrow was like in the comics during the Golden Age and Silver Age.
  • Connor Hawke
  • Rick Flag Jr.
  • While it was already revealed that Robert Queen assumed the identity of the Arrow, keep in mind a lot of what happens on Earth-2 is a parallel to what happens on Earth-1. On Earth-1, the identity of the Arrow was revealed to be Roy to the public (which Roy did to protect Oliver). Keeping in mind it mentioned Robert as being "The Arrow", there might still be someone on Earth-2 who took up the moniker of "Green Arrow" after Robert was arrested, similar to what Oliver does on Earth-1.
    • Perhaps Oliver is actually still alive, and hasn't returned yet. When he does, he'll find out about his fathet's crusade and set out to continue it, becoming the E2 Green Arrow.

Given that Jay and Harry keep mentioning the existence of Atlantis on Earth-2 (and one of the 52 breaches leads there, no less), it seems likely that Barry will end up coming face-to-face with an Atlantean at some point. While Aquaman seems unlikely (given that he'll be showing up in Batman v Superman next year), they could very easily bring in Aqualad, or even just an Atlantean villain.
  • They specified that their Atlantis never sank, which means they're probably still a Magitek society.

    The Man in the Iron Mask 
The masked man is actually Jay Garrick
Think about it, he has brown hair like Jay and kept tapping out his name in code. We know there's a Hunter Zolomon on Earth-1, so why shouldn't there be one on Earth-2. The Jay who's been interacting with Team Flash is really Hunter doing a really good Jay impression. He was so slow to come to Caitlin and Iris's rescue, and he was lingering way to close to that breach for comfort. Plus he's been lying to Team Flash about how he lost his speed and his fights with Zoom for so long.
  • Adding to the above, "Jay Garrick" who crossed over to Earth-1 is actually The Rival, Golden Age version of Reverse-Flash. He is obsessed with Flash to the point that he performed cosmetic surgery to look like him with the eventual intention of replacing him altogether. He doesn't have a connection to the Speed Force, instead relying on Velocity drug to give himself temporary powers — that's why he is of no interest to Zoom, which brings us to the conclusion — he is working with Zoom to make Barry faster, and in exchange Zoom gets rid of the real Jay Garrick for Rival to take his place.
  • The masked man also seemed to react violently to Barry's mention of Jay. Maybe he wanted to shout something like "He's not Jay Garrick! I am!" if he could actually speak.
  • It would make sense. But I don't think it's Hunter, but rather an evil clone (from Earth-2) who wants to get faster than the original, Jay Garrick, and I think he and Zoom are somewhat working together. This is definitely something for the Rival.
  • Word of God confirms that the Jay who's been interacting with the team all season (or at least the guy calling himself Jay) is indeed Zoom.
    • Still doesn't reveal who the man is.
    • That doesn't follow though, Zoom carried Jay's body back to his Zoom Cave before unmasking himself, there'd be no need to do that if Jay wasn't a separate person. Team Flash now certainly believe Jay to be Zoom, but there's clearly more to it than that.
      • Not really. Per 2x19, the man that the team knew as "Jay" was indeed Zoom, and the dead person is a Time Remnant version of his that he pulled up to help him maintain an identity on both Earths when Barry decided to go to Earth 2. However, Masked Man may still be The Real Jay Garrick that Zoom stole an identity from, however The Real Jay may not even look like Teddy Sears.
  • In Zoom's lair, Jesse's cell has bars, while both the masked man and Barry's cells have the special glass which he couldn't phase through, hinting that the masked man is also a speedster.
  • Now, as of Rupture, we know that 'Garrick' is Henry Allen's mother's maiden name. Most likely, due to differences between the world, Earth 2!Henry Allen took his mother's maiden name and goes by 'Jay' (maybe short for a middle name, or his parents named him that instead, or he's Henry's brother/Barry's uncle), and he's the real Earth 2 Flash (who was taken out and replaced early by Zoom). It'd be a great way to have John Wesley Shipp as the Flash again and get a Jay Garrick who's actually visible Older and Wiser, not to mention probably the only way Barry will be able to trust anyone claiming to be Jay Garrick.
  • Confirmed, though not exactly right. He is the original, heroic Jay Garrick, as well as Henry Allen's doppelganger, but he's actually from Earth-3.

Similar to the above, but the masked man is a Jay Garrick from the future
Sort of. We see Zoom pull our Jay back through the portal into Earth 2. What if Zoom takes this Jay back in time and sticks him in the cell. The reason why the Masked Jay has such a strong reaction to Barry saying his name is because Masked Jay knows that this is the Barry who's about to return to Earth 1, meaning his version of Jay is about to get caught by Zoom. It why we can't see his face, it would give too much information to Barry and he'd be extra careful to keep Jay away from the portal, even without knowing the specifics.

The masked man is actually John Diggle
Their masks are similar, and you can see that the masked man's hands are dark-skinned. Plus, John Diggle was in the military.
  • Looking at images, the dark skin appears to merely be a combination of low lighting and dirt rather than skin tone.

He is Wally West
Zoom would wants to keep his eye on Wally West. (Hello? Future speedster. Just like Jesse Quick.)

Hunter Zolomon
In a strange twist, Hunter Zolomon is good on Earth-2 while Jay Garrick is evil (and thus is Zoom).
  • Jossed. E2 Hunter Zolomon is a villain, who took on the identity of Jay Garrick, The Flash, as well as Zoom, "to give people hope, so he could take it away from them". However, looking at the words of Berlanti (that the team would never really make Jay a villain), we may see the Real Jay Garrick yet.

The man in the iron mask is an Atlantean
As mentioned above, probably not Aquaman, but it could be a stand in for him. Jay did mention having a friend from Atlantis and this guy seemed to know Jay. This would raise the question of how and why Zoom captured him.

The man in the iron mask is a version of Kaldur from Young Justice
There are two things we know about the man for certain. He, or at least his hands, are black/African American. He also has blond hair. These are two traits shared by Kaldur. Kaldur is also an Atlantean, a city that pops up frequently in Earth 2. Kaldur and Wally West's Kid Flash also were on the Young Justice team together. Maybe Earth 2's Kaldur was on a team with Jay instead? With his arms covered, we don't know if Kaldur's signature tattoos are there. And as Kaldur's father is a villain, maybe he picked up the PoW code from him. Either way, the more limited history for Kaldur gives the writing team more ways to pay around with his history in Flash.
  • Looking at images, the dark skin of his hands appears to merely be a combination of low lighting and dirt rather than skin tone.

Jay's wife or girlfriend, Joan.

Joseph Garrick, Jay's father
The code he was using was used by POWs (Prisoners of War). Jay's father apparently died during the War of the Americas. But did he die, or was he simply kept prisoner for years? That's also why he tapped Jay's name. He knew his son was The Flash and couldn't see, and was hoping that someone knew where his son was.
  • Partially jossed, we learn that Jay is really Zoom. But it's possible he's Zoom's father. He put the mask on him as torture for killing his mother. And also to show his dad the monster he's become.

The man in the iron mask at the end is Shazam, or some version thereof.
  • It's similar to how Alexander Luthor was silenced in Forever Evil. His attempts at tapping could be an attempt to code out the word "SHAZAM" to get around the restriction of the helmet.

The man in the iron mask is present-day Zoom, whereas the evil speedster is from the future.
And this is part of Zoom's origin story. Present-day Zoom is not yet a speedster, nor is he evil. Barry promised him in "Escape From Earth-2" that Barry would come back for him when he got the chance. Barry ends up not being able to keep this promise, which is what leads to Zoom resenting him so much and completing his Face–Heel Turn. Eventually, future Zoom releases present-day Zoom, who somehow becomes a speedster. Zoom decides that he likes being evil more than being good, so he eventually goes back in time and kidnaps his past self, thus ensuring the Stable Time Loop of Barry breaking his promise to Zoom and Zoom becoming Barry's enemy as a result.

The man in the iron mask is an Eddie Thawne, probably the one from Earth-2
He had short blonde hair and what appeared to be blue eyes. We also know from "Welcome To Earth-2" that Earth-2!Eddie is still alive.

The man in the iron mask is Eobard Thawne, from a point in his life before Season 1
He appears to recognize the Earth-1 Flash, so that would rule out most Earth-2 candidates. He's placed in similar cell as Barry, so he's probably a speedster. And in the first season finale, Eobard recognized Jay's helmet and was obviously shaken by seeing it. So it could be that, before the time travel trip that landed him in season 1, Eobard had travelled in time before. One of those trips somehow took him to Earth-2, where he became Zoom's prisoner. This could even lead to an Enemy Mine situation, where Barry and Eobard have to join forces to fight Zoom.

The man in the iron mask is actually Earth-1 Ronnie.
Rather than dying during the portal incident at the end of Season 1, he just got trapped on Earth-2. At that point he was captured by Zoom/Jay and forced to tell him about Earth-1 and Team Flash (or maybe he didn't realize Jay was a bad guy until it was too late). Either way, Zoom learns all about Earth-1/Team Flash and how Wells/Thawne pretended to be Barry's friend and helped him get faster in order to get what he wanted. Jay (who is dying due to Velocity-9 abuse) believes that stealing Barry's speed is the key to saving his life. So, inspired by what Wells/Thawne did, he comes up with a similar plan to get Barry faster and then steal his speed. By sending villains at him and simultaneously befriending him and telling him how to beat said villains. Jay isn't happy at all about Wells arriving and trying to have Barry fight him before he's ready and/or take Velocity-9 (since doing that would mean that Barry's speed could no longer save Jay) which is the main reason for his dislike of Wells.

The man in the iron mask is The Atom of Earth-2.
But he isn't an alternate of Ray Palmer, but is instead Al Pratt, the first Atom from the Golden Age of Comics. Or at least based on him. Jay/Zoom captured him because he's a metahuman, and a potential obstacle in his plans. The Al Pratt Atom can't shrink, but does have "atomic strength and agility" and a brilliant scientific mind. It wouldn't be too hard for the villainous speedster to pin him as someone who should be taken out of the picture. The mask could be a reference to Al's costume's mask. It covered his whole face.

The man in the iron mask is not played by Teddy Sears
While the most common theory up until now is that this man is connected to Jay Garrick/Hunter Zolomono/Zoom, on April 13th Teddy Sears gave an interview in which he stated that the reveal doesn't come until the season finale, and he himself didn't know until last week. So if he didn't know who was under the mask, then presumably it wasn't him. Of course, there's the possibility they just used a stuntman until The Reveal like they did with Zoom, but it seems less likely, given that the prisoner hasn't yet been in any action sequences and thus would not require a stuntman.
  • Very much possible, since according to an interview with Berlanti, which appeared right after 2x19 (where we learn that "Jay Garrick" is supposedly just an identity E2 Hunter Zolomon created "to give people hope, so he could take it away from them"), "the writers would never make Jay Garrick a villain, keep watching". So, the Real Jay Garrick may have been abducted by Zolomon, his identity as both a citizen and the Flash usurped long ago, his friends and relatives killed (so that nobody could recognize that Zolomon is not Garrick), so he may not even look like Teddy Sears.
  • Confirmed.

The man in the iron mask is Zoom / Hunter Zolomon after he embraced the Flash / Jay Garrick persona.
When Hunter explained his use of time travel, he mentioned how he liked playing the hero even though it was so people would have hopes for him to crush. Perhaps some other past or future version of Hunter decided that "Jay" would be victorious after all, but is being punished and mocked for Becoming the Mask.

Hunter's mother
She didn't die, the gunshot only damaged her face. Either Hunter put a mask on her because he can't stand to see her face anymore, or she did it to herself for that same reason. Maybe also to alleviate any pain she's feeling from her injury (like how Robespierre tied his face after injuring his jaw trying to commit suicide).

The Jay Garrick of another Earth
This would explain where Zolomon got the idea of the 'Jay Garrick AKA Flash' persona. On this other earth, Hunter stopped his father from killing his mother. James Zolomon went to prison, while Hunter and Ashley moved out of Central City (to Keystone City perhaps) and changed their names, with Hunter becoming 'Jay Garrick' (alternatively, Hunter may have changed his first name for whatever reason, and Ashley could have remarried and her new husband had the last name Garrick). Jay grew up in a happy home, overcame the traumas of his past, became a successful scientist, and when the particle accelerator explosion (or some other accident involving hard water) occurred on his earth, he became a speedster and assumed the heroic alter ego of the Flash, becoming the hero his father had once been. Jay ended up travelling to Earth 2 at some point where he was captured by Zolomon. Zolomon resented the fact that Jay had the life he might have had, if only he'd stopped his father, and so stole Jay's identity.
  • Confirmed, albeit not exactly as described: the man in the mask is Jay Garrick of Earth-3, who was captured by Zoom and held captive while Zoom ran around using Jay's identity. He is not, however, a doppelganger of Zoom/Hunter Zolomon, but rather of Henry Allen.

The man in the iron mask is Kal-L.
Zoom did say they wouldn't believe him if he told them.

The man in the iron mask is actually the 1990s Barry Allen / The Flash
Think about it.
  • Everyone and everything shown in the portal on the way to Earth-2 has already appeared (Connor Hawke, Supergirl, Jonah Hex, The Legion Ring and Grood) so far except for him.
  • He is imprisoned in the same type of prison Barry was locked into, suggesting that he is also a speedster.
  • In relation to the above, Zoom is after speedsters.
  • Zoom replied "You wouldn't believe me if I told you" when Barry asked about the masked man's identity.
    • Combining this with the Jay Garrick WMG listed above - the Flash from the 90's TV show is actually the Henry Allen of that earth (who happened to be named 'Barry; maybe its a name that runs in the Allen family). Decades after the events of the TV show, Flash ends up stuck on Earth 2 after inadvertantly travelling there. He adopts the cover identity of 'Jay Garrick' - Jay after his deceased brother, and Garrick being his mother's maiden name as E1 Henry recently revealed. At some point, he comes into contact with Zoom, who eventually imprisons him and steals his identity.
  • Maybe the Henry of that universe is actually named Barry, and so is his son
  • What if the man in the iron mask is an older version of barry of earth 2
  • Jossed. The Man in the Iron Mask is not the 1990s series Flash. But they are both played by the same actor.

The man is the Earth 2 counterpart of an Earth 1 villain from Season 1.
  • Farooq Gibran/Blackout
  • Roy G. Bivolo/Rainbow Raider
  • Kyle Nimbus/Mist
  • Tony Woodward/Girder

Quentin Lance's Earth-2 doppelganger.
Because...who would see it being him coming?

An adult Per Degaton.
Legendsof Tomorrow introduced him as a kid. Maybe Per, having always partially suspected Vandal Savage would turn on him thanks to what Rip said, found a way to travel to an alternate world to start anew...only to be captured by Zoom because he was a dimensional hopper. It could be how Zoom found out about Earth 1 if the man, whoever he is, is from Earth 1.

A character from another CW show.
One that ISN'T from the Arrowverse in any capacity. Which will lead to revealing that all the CW shows such as iZombie, Janethe Virgin, The 100, Crazy Ex-Girlfriend, cancelled shows like The Messengers and Star Crossed, and upcoming, future shows like the Riverdale show all take place in a multiverse!

Barry Allen.
After being disintegrated in the particle accelerator in S 02 E 20, Barry somehow reformed in a different time and place (maybe even a different Earth?) and was found by Zoom. By interrogating Barry, Zoom learned all he needed to know about the S.T.A.R. Kids and how to conquer Earth-1.
  • Jossed, but he is played by the actor who played Barry Allen in the 1990s Flash series.

     Post Season 2 Pre-Season 3 Theories (SPOILERS FOR THE SEASON 2 FINALE) 

Experiencing the unadulterated timeline in Season 3 will be how Barry will learn to cope with Tragedy.
Barry told Iris that he needs time to fix himself, which is through experiencing the unadulterated timeline for Season 3, then he'll stop himself from rescuing his mother to return to his real timeline, but with all the experiences of Season 3.

In Season 3, Earth 1 Hunter Zolomon will become Joe's new partner
After dealing with his Earth 2 counterpart, Zoom, it will at first be an awkward and jarring situation for the team until they slowly actually befriend him, perhaps with him even becoming a Big Brother Mentor of sorts to Joe's son Wally, all the while, the team is terrified of him following the footsteps of his Earth 2 counterpart. As a potential twist, Grodd may return and cause the events that triggered Zolomon becoming Zoom in the comics, resulting in the team having to deal with a new Reverse-Flash/Zoom who's more akin to the comics. Bonus points if he actually uses Eobard's suit rather than Earth 2's Zoom,

Zoom will become the Black Flash
  • The season 2 finale heavily suggests this. As he is carried off his suit's symbol becomes RED like the black flash, and his mask is rippled in the same way the Black Flash's mask is in the comics.

Differences in the Flashpoint timeline:
  • Supergirl will be integrated into the DCW.
  • Dead characters may return, such as...
    • Ronnie Raymond
    • Eddie Thawne
    • The Reverse-Flash
    • Henry Allen
    • Harrison Wells (the original Earth-1 version)
    • Nora Allen (obviously)
    • Tess Morgan
  • Good characters may become evil, or vice versa.
    • Captain Cold may become Citizen Cold, a la the Flashpoint comic.
      • Likewise, the rest of the "Rogues" (Heatwave, Golden Glider) will be Cold's partners fighting against crime in Central City.
    • An Earth-1 Killer Frost.
      • Caitlin becomes the one locked in the Particle Accelerator instead of Ronnie, becoming Killer Frost.
    • Robert Queen is the Hood akin to Thomas Wayne as Batman; he will use Dual Wield handguns rather than a bow and arrows.
      • Or he'll use more lethal arrows.
    • Francine West will not leave Joe West and Iris West: Wally West will be born into the family. Furthermore, Francine won't be diagnosed with cancer.
      • Or Joe ends up being the one who leaves the family/dies, leaving Iris to be raised by Francine, and because she's an addict, Iris and/or Wally end up addicts or even criminals.
    • Amanda Waller is President of the USA, and a little nicer. Just like in Justice League: Gods And Monsters.
      • Or Slade Wilson (despite being Australian in the Arrowverse), similar to his role in Justice League: Crisis on Two Earths
      • Wilson would become president is if things gotten so bad that they'll even allow worthy candidates who aren't natural-born Americans.
  • Gang wars between super-criminals and metahumans.
  • World War III takes place, instigating it is the Secret War between the League of Assassins and HIVE.
    • OMAC will launch the nuclear missiles. The fallout will be known as the "Great Disaster".

When things return to normal (Chances are they will, because Status Quo Is God), there will be a few differences
  • Supergirl will be part of the Arrowverse.
    • This includes all Superman characters and mythology previously referenced in Supergirl Season 1.
  • Captain Cold will live again, possibly the same with Laurel. (The second is a bit more unlikely)
  • Jay Garrick will be the first Flash a la post-Crisis on Infinite Earths. How this can be done is to be determined since Jay Garrick of Earth-3 is the Earth-1 counterpart of Henry Allen in the Arrowverse.
    • This could work if Jay Garrick becomes Henry's cousin, since it's revealed that "Garrick" is Henry's mother's maiden name. This would also be an in-universe explanation for his resemblance to Henry. Thus, Jay would be Barry's honorary uncle.
    • Adding to this Jay Garrick's superhero career will be similar to the 90's TV show. The only known criminals he battled are the Trickster and Mirror Master (who has yet to appear in the 2014 show).
  • Earth-2 characters and elements will be integrated into Earth-1
    • Given Black Siren is imprisoned on Earth-1 post-Season 2 of The Flash, her history "blends" into Earth-1 Laurel's origins: she will be the true Black Canary, the one born with the metahuman gene that allows her "Canary Cry" from the comics. Whether this was inherited from Laurel's mother Dinah Lance is to be determined.
      • Also, Dinah could be the original Black Canary, as per the comics: Laurel will be her mother's successor.
    • Harrison Wells of Earth-2 will either blend with or entirely displace the Earth-1 Harrison Wells.
      • Provided Eobard Thawne will not assassinate this new Harrison Wells and become him, Wells still activates the Particle Accelerator in 2014 instead of sometime later in the post-2020s, thereby allowing Barry Allen to become the Flash in his 20s. Furthermore, if Eobard doesn't kill Wells, neither will Tess Morgan die: therefore, Jesse Wells of Earth-1 will be born.
      • Though Tess Morgan may still die (maybe while giving birth to Jesse), leading to the father-daughter relation like in Earth-2.
      • Also, some elements of season 1 will be preserved by having Reverse-Flash kidnapping and replacing Wells at some point.
  • Arrow will stay the same with hardly any changes to the show's history. Though most of the previous crossover episodes may have occurred differently than what we saw before.

Feel free to add your own guesses

In the new timeline created by Barry Allen going back and saving his mother Robert Queen would become the Arrow instead of Oliver
  • Because Green Arrow is the closest the Arrowverse has got to Batman and it could be similar to what happened in Flashpoint.
    • Does that mean we'll get to see Moira Queen as the Dark Archer, a la how Martha Wayne became The Joker in Flashpoint? I sure hope so.
      • Why not? That sounds awesome, and an interesting look at Moira's character.

Cisco's vibe about the destruction of Earth-2 will come true
  • Except it's not the destruction of Earth-2, it's the destruction of The Multiverse, ala Crisis on Infinite Earths. When the season is said and done, there will only be one Earth. The history will be mostly the same, but it will now be home to all the characters we've seen from the Multiverse so far (Jay Garrick, Harrison Wells of Earth-2, Jesse Quick, Alternate!Connor Hawke, Alternate!Jonah Hex, and Supergirl), plus anyone else the writers want to add. Krypton will have existed and been destroyed on Earth-1 and the entire history of Supergirl will become part of the shared history of the Arrowverse.

From a narrative standpoint, this will make it easier on the writers when they want to do crossovers and bring in recurring characters who are currently living on other Earths, since they won't have to make up an excuse for a character to jump dimensions every time they want to do that.
  • Actually, at the moment, a multiverse is the writers' best excuse for not having regular crossovers. People are already irritated enough by the fact of limited crossover events for Flash and Arrow? I get that Flash was busy with Zoom and that's all well and good. But seriously, did his group not get the heads up that the world was going to be devastated by a nuclear strike. Could they not have at least mentioned it? This is also a reason Flashpoint can't possibly take on an entire season. If the Flash goes through an entire season in Flashpoint, it would require Arrow to do the same.
  • I don't think they're going to have Flashpoint have the fallout of Crisis. The destruction of Earth-2 will happen due to whatever the plot of Season 3 is, although there is some clear universe damage going on in the vibe. Word of God has confirmed that the next season villain will not be a speedster. It's my personal theory that Crisis will not get adapted before Gotham's Bruce Wayne becomes Batman, because you'd have to be out of your flipping mind to create an Earth-1 in which Barry Allen's Flash and Green Arrow, as well as others like The Atom and Hawkgirl, started appearing long before Batman. It makes more sense for this world to lack a Batman. If they merged the Earths now, we'd have a child Bruce Wayne at the same time Green Arrow has been at this for ages. That would completely ruin that universe's mythos, because just imagine a universe in which Barry Allen, Green Arrow and many more have a decade or more of experience when Batman appears on the scene. Even the New 52 didn't screw up that badly. That said, we know Wayne Enterprises exists in the Arrowverse thanks to Thawne's newspaper. More importantly, we know it's merging with Queen Inc, which means that for some reason either Bruce Wayne bought out Queen Inc, which implies things are seriously bad on Team Arrow, or that Queen Inc bought out Wayne Enterprises, and Bruce Wayne as we know him would never allow anyone to buy Wayne Enterprises for numerous reasons. A Bruce Wayne that knows Ollie wouldn't buy Queen Inc unless he was asked, and vice versa, especially if Bruce were basically a novice in comparison to Ollie. If the text weren't just some other random article copied in there we'd know, but the CG artists and writers were both lazy and stupid since they forgot we could read it thanks to HD and there's no way people won't try to read any snippet of information on Batman in the Arrowverse. Plus it wrecks our Willing Suspension of Disbelief. But, that headline regardless is odd, and implies that either something goes REALLY bad for Ollie by 2024 in the original timeline, or something is seriously wrong with the Arrowverse Bruce Wayne. Either way, I think the plan is for Gotham's Bruce to become Batman, and then adapt Crisis to get them all in one universe. I think the Wayne family of the Arrowverse is intact. The fact that the League is a part of the Arrow mythos here further implies that Batman's not around, along with all the stuff that's happened to it. Basically, if they tried to bring Batman in without Crisis, they'd wreck Batman's character and mythos, because he's supposed to have the role given to Arrow in this one.

The Flashpoint Paradox will be explored in tandem with the regular timeline

In that particular comic we find out the original Wally West was stuck in the Speed Force following Flashpoint and had been trying hard—and failing—to get back. His explanation for being there was largely due to his running to the edge of the timeline to find out what caused the Flashpoint to occur. It's made unclear when this occurred, since doing so trapped him and slowly erased him from history. However, it could be possible that the remnant of the unaltered timeline lingered long enough for Wally to run into the Speed Force to look for Barry, only to get trapped when the Cosmic Retcon occurred. Also note, it was revealed in the same comic that pre-Flashpoint and post-Flashpoint are the same Earth, with post-Flashpoint being a severely altered timeline of New Earth/Earth Prime due to history being written over if not completely wiped (a.k.a. "stolen time").

Something similar can happen to the show. Barry goes missing and Cisco begins Vibing all sorts of abnormalities in the fabric of the universe and starts noticing signs of their existence being threatened. It'll take maybe half a season for him to figure out the source, or less, and the rest can go into trying to get Barry out of the Flashpoint. While Barry experiences life within the Flashpoint, he'll eventually learn that what he did was wrong (due to severely altered events like Robert Queen being a Mafia-leading Green Arrow, or maybe a doppleganger of Kara appearing in the same imprisoned and drained state as Flashpoint!Kal-El—all of which teaches Barry that it's unfair to overwrite his own tragedies when others can't do so for themselves), it takes Team Flash finding a way to kickstart Wally's dormant abilities so that he can follow Barry through the Speed Force so that he can find Barry and take him home. This, of course, is not even considering who the Big Bad in season 3 will be—if any. May or may not be a part of/the source of the four-part crossover regarding all for of the CW's DC shows.

In addition to the "Robert Queen = Flashpoint Green Arrow" WMG above, Supergirl will fulfill Superman's role from Flashpoint.
Being a government experiment locked away from the world before Barry and Robert set her free. Perhaps Martian Manhunter or The Atom could fill Cyborg's role as well.

Instead of the Atlanteans and the Amazons, the war in this version of Flashpoint will be between the League of Assassins and the Thanagarians
The League will be led by either Ra's al-Ghul, Malcolm, or one of Ra's' daughters. The Thanagarians will be led by either Kendra or Carter.

Barry will travel back in time again and stop himself from saving his mother

After finding out that things in the new timeline are too different for him to get used to, Barry will travel back in time again (Assuming he still has his speed), and stop his past self from saving his mother. Then he'll also stop his past self from "Fast Enough," which will result in a Stable Time Loop (Sort of).

Jay Garrick doesn't have a connection to the Speed Force

In the season finale, Zoom admits to a captive Joe that he couldn't steal the real Jay's speed, despite having no trouble taking Barry's. This could be because, like his comic book counterpart, Jay Garrick has no connection to the Speed Force. In addition, Zoom-as-Jay's phony explanation for getting his powers resemble the real Jay's heavy water lab accident, suggesting that he took Jay's origin story as well as his name. This in contrast to Barry and Hunter, considering: both being struck by lightning during a particle accelerator explosion, Barry actually meeting the Speed Force, and Hunter showing no indication of his comic time-based powers but relying purely on speed.
  • There is a simpler explanation: Zoom hasn't showed the ability to steal speed on his own, at all. He needed Harry for that. Yes, "Jay" indicated that Zoom just stole his speed himself, but that was a lie, since "Jay" was "Zoom". Without Harry's tech (that he developed only after killing the Turtle), Hunter just couldn't do much but imprison his foe.

When Barry inevitably stops his past self from saving his mom, instead of killing him, he takes him back to the future, putting him in the pipeline. This Barry becomes Malcolm Thawne/Colbalt Blue.

Since future!Barry would've essentially have taken everything from this now-time remnant, the biggest thing that would be on his mind would be revenge. He gets an idea, when he escapes, he goes to the time vault & asks Gideon how Eobard Thawne was able to become Harrison Wells. Then after he makes or obtains that DNA splicer Thawne used, he grabs Eddie's Corpse either seconds before it gets sucked into the wormhole or within the wormhole itself. & turns into Eddie. Sometime during all this, unless Eddie's death & dissappearance hasn't been addressed in-universe, he has a conversation with Malcolm Merlyn, mirroring his conversation with Oliver in the pilot, this is be where he gets his name from, if people outside of teams flash or arrow are aware that Eddie's dead.

Season 3 won't take place Just Before the End like Flashpoint did in the comics

In the comic, the Flashpoint story took place Just Before the End, with a war between the Amazons and Atlanteans about to destroy the world. For obvious reasons (most notably budget and not having rights to the characters) this won't happen in the show and the season will be more likely to focus on how the individual characters are different. Furthermore, Thawne dropped some hints throughout Season 1 about the original timeline where Barry's mother lived.
  • We know that Barry still eventually became the Flash, but not until 2020. And he also mentions that there were other speedsters.
  • He also claimed that the members of Team Flash (specifically Cisco, Caitlin, and Joe) are better off than they would've been without him.
  • Additionally, he hints that Wells' wife was still alive during the time of the particle accelerator accident in the original timeline, which could hint that Jesse had an Earth-1 counterpart.

Rather than adapt Flashpoint's world, the show's alternate timeline will be somewhat smaller scale.
  • The United States are in disarray due to two separate forces that are at war with one another. The first being the League of Assassins lead by Nyssa Al Ghul and Shadowspire, lead by a still living Baron Reiter.
  • The president of the US is Damien Darhk, who is as evil as ever and has a rebellion against him. The rebellion is spearheaded by Cisco, here a fully realized Vibe and his allies include Blackout (Farooq) and Vixen among others.
  • Star City is still called Starling City and is protected by Mister Terrific, a brutal, but technologically brilliant vigilante who fights against the heartless crime boss Quentin Lance with assistance from Winslow Schott, a brilliant hacker and a survivor of...
  • National City, which was destroyed by a rocket of alien origin crashed and reduced the city to rubble. It carried Kara Zor-El, who was captured and locked in a lab run by the Danvers and Professor Ivo.
  • Hawkman has been brainwashed by President Dahrk to become the leader of a metahuman strike force that includes Sand Demon and Double Down among others.
  • Central City has Joe West as the mayor, Iris is dead, Caitlin and Ronnie are assistants to the resistance, Professor Stein runs STAR Labs and tends to a comatose Jefferson Jackson who was struck by lightning, Deathstroke is a merc working for Darhk based in Central, and Hartley and Singh are both lovers and crooks.
  • Nora is alive, but is in a wheelchair and Henry was murdered by Deathstroke.
  • Oliver Queen is a senator and Diggle is his bodyguard. They live at Monument Point and often work with a business magnate version of Vandal Savage.
So basically...none of this will happen because it is actually kind of dumb of me to think up.

There will eventually be a Flashpoint version of Jesse Wells wth her canonical speed powers
  • Consider this: Since Nora didn't die in this timeline, Eobard never had any reason to target Harrison Wells, so he and Tess Morgan are still alive. If we assume that Earth-2 Jesse was the product of their relationship in that dimension, then it stands to reason that she would be here too, which would place her in Central City around the time of the particle accelerator explosion, meaning this version could be a metahuman.

The Flash Family will be officially formed.
  • Violet Beane (Jesse's actress) has confirmed she's coming back at some point this season, and promotional photos of Wally wearing the Kid Flash suit have been released, meaning he's going to be a speedster too.
  • Since Henry was killed by Zoom and the real Jay Garrick is his Earth 3 doppelganger, it would make sense if Jay came back to help Barry through his grief, and to finally give the Golden Age Flash a proper debut and flesh out his character.

Johnny Quick (Crime Syndicate) will appear as Barry's Earth 3 doppelganger and the real Jay Garrick's son.
  • Having Earth 3!Jay and Barry team up to fight Johnny Quick would give the two a chance to interact and work through their personal tragedies, allowing Barry to truly come to terms with his parents' deaths and allow him to stop himself from going back in time at the end of Season 2.

Season 3 will combine elements of Flashpoint and Out of Time
, with the new evil speedster being [[spoiler:Future Barry Allen.]]
  • Having been psychologically and emotionally broken by the events of Season 2, Barry goes back in time and saves his mother from the Reverse-Flash. But because Nora's death is a "fixed point" in the timeline, there are massive repercussions. So he tries again and again, with each shift growing worse and worse, resulting in even more of his loved ones dying. Finally, realizing he can't change the past, he decides to make sure nothing ever hurts his loved ones again, becoming a brutal, murderous vigilante that'd shock even Oliver, and it's up to his present day self/time remnant to stop him.

The four-part crossover across The Flash, Arrow, Legends of Tomorrow, and Supergirl will address the Flashpoint paradox and puts Barry at odds with everyone
Goes along with the Reverse-Flash taunting Barry about becoming the villain. Barry is going to fight for the changes, even if it all feels so alien to him. However, something causes the dimensional barrier to fracture, which triggers large changes over in Arrow and gets the attention of the Justice Society over in Legends of Tomorrow. The crossover kickstarts with Kara encountering the dimensional anomalies and going in to investigate, which leads her to The Flash, but it won't be resolved there. We go over to Arrow, which can potentially be the pre-Flashpoint version of the setting (barring how subtle that change actually is, according to Amell). Finally we get the finale over in Legends where everyone convinces Barry to change it back.

The following week, everything is as usual, only in The Flash Barry has to deal with the rammifications of his actions, and he notices that despite the Flashpoint being undone there are significant changes that cause more harm than good.

Either Barry will start taking advantage of the fact that he apparently owns S.T.A.R Labs now, or after Flashpoint he won't own it.
Thawne left Barry everything, which since S.T.A.R Labs still has power, means Barry is rich. There's no way Barry could naturally afford to maintain S.T.A.R Labs, yet the books never seem to even be an issue, meaning that chances are all of "Harrison Wells"'s wealth is Barry's, meaning he's rich and probably owns all of S.T.A.R Labs' patents now, which would explain how that wealth replenishes itself. For multiple reasons we can infer that there are no shareholders and that S.T.A.R Labs was never publically traded. So, either Barry will lose control of it via self-caused retcon, or after changing the past fails, he'll seek to change the future. Maybe we'll even see Gideon, since Barry just kinda forgot he has an AI with the voice of Inara Serra.

Post-Flashpoint will be a Close Enough Timeline
Based on the comments about how Flashpoint would affect the rest of the season despite the implications that it will only last one episode, and that the changes would affect the rest of the Arrowverse, it's very likely that while most things will be how they were before, there will be a few changes to get used to.

Wally will be Barry's version of Speedy, yet will be a more stable mentor-mentee relationship.
Wally seem to be turning into a more stable version of Roy, showing how after being saved from Zoom thanks to Barry sacrificing his Speed Force powers to him, he became very loyal to the Flash, even wanting to be more like him.

When the timeline is fixed, Flashpoint Wally 'survives' and becomes Kid Flash going forward
Based on the SDCC trailer we know that Wally is the Flash in the Flashpoint timeline. Also recent photos from the season premiere indicate that Barry will be interacting with Flashpoint Wally soon enough and confiding in him soon enough. So would it be crazy to assume that Flashpoint Wally somehow helps Barry fix the timeline, and in the process he 'survives' the erasure of his timeline and sort of 'merges' with Earth 1 Wally. He has memories from both timelines (or maybe he mostly has memories mainly from the Earth 1 timeline) but he's somehow retained his powers and his suit and remembers being Flash. This leads to him becoming Barry's partner in the fixed timeline, except that the public dubs him 'Kid Flash', which annoys him because he at least vaguely remembers being the ONLY Flash.

     Season 3 Theories 

Barry still met Team Arrow in the Flashpoint timeline
While obviously, the Arrow/Flash team-ups wouldn't have happened as they 'originally' did (though its possible Wally as the Flash may have teamed up with Oliver at some point), its entirely possible that the Barry Allen of this timeline still met Team Arrow, as depicted in the Arrow Season 2 episodes The Scientist/Three Ghosts. The only difference would be that instead of visiting Starling City to investigate a potential supernatural incident because of his mother's murder, Barry would visit Starling City because he's fascinated by supernatural incidents ever since a mysterious man garbed in red, who had super-speed, saved his mother's life from another speedster in yellow.
  • This isssssssssssssssss... Jossed.

The timeline at the end of Flashpoint is the 'real' one
Like Eobard said 'The timeline is restored, at least for me' seems to imply that now Barry is in the 'real' timeline, by 'real', I mean the timeline where Eobard never stay trapped into the past, so Harrison Wells survived and the particule accident won't happen until 2020. Based on this, it could mean that in Legend of Tomorrow, one of their objective would be to capture Eobard Thawne, remove his speed and strand him to the past so Barry's timeline get restored.
  • Unlikely. Joe and Wally allude to Henry's recent death. And promos for the next episode show Barry interacting with Felicity who clearly knows him. This suggests that its a timeline very similar to the 'normal' timeline of the show, barring a few subtle changes like the Joe-Iris rift and whatever seems to have happened to put Cisco and Caitlin in a bad place (as per next week's promos).
    • Well to be fair, Henry could have died for any reason (Killed by an inmate because he was still in prison for example) and Felicity knew Barry before he became the Flash, so ... maybe, maybe not, the rest of the season will tell as always.
      • Jossed. The timeline is the same as the Season 1/Season 2 timeline except for a few changes (Iris not forgiving Joe for hiding the fact that her mother was alive, Dante having been killed by a drunk driver, Barry having worked for a year with Julian Albert etc.).

In this new timeline, Wally was raised by Joe while Iris stayed with her mom, thus causing the rift between her and Joe.
We all know that in the original timeline, Wally was born after Joe and his wife split up, and his wife never told Joe about Wally until the events of season 2, choosing to raise him herself. My guess is that in this new timeline, the two of them stayed together a little longer, at least until after Wally was born. Then, when they finally did get a divorce, Iris went with her mother while Joe kept Wally. It would explain why Iris and Joe are suddenly on non-speaking terms.
  • Jossed. The history of the West family is exactly the same as it was...the only difference is that in this timeline, for some reason, Iris did not forgive Joe for keeping the secret that her mother was alive, which led to them not being on speaking terms.

Doctor Alchemy is aware that the Dominators are planning to invade Earth.
He says his goal is to "prepare the world"; perhaps by creating an army of meta-humans to fight off a coming invasion which could threaten humanity's existence?

Doctor Alchemy is Julian Albert
I didn't come up with this theory myself, but it seems to be a popular one floating around. There are several possible reasons...One is that last season the civilian identity of the Big Bad also first showed up in the second episode, and fans know from the second season that the writers have no qualms about essentially repeating plot points across multiple seasons (given the similarities between the reveals behind the Reverse-Flash and Zoom). I'm not sure about the other reasons.
  • Confirmed.

"Julian Albert" is a pseudonym taken from Atom Smasher's full civilian name, "Albert Julian Rothstein"
"Julian Albert" is not the name of any known DC character, but it does sound somewhat similar to one we have encountered so far. The full name of Atom Smasher, the Starter Villain for season 2, is "Albert Julian Rothstein". Notice how they said that Julian had been working alongside Barry for about a year now...the second season premiere was when the Earth-2 Albert Rothstein arrived on Earth-1 and killed his counterpart, and took place about a year before the episode "Paradox". Thus, "Julian Albert" may have taken this as a pseudonym following this incident.

Savitar is Edward Clariss, The Rival
This theory seemed fairly likely following the events of "Flashpoint" but far less likely following the events of "Paradox", when Clariss is seemingly killed by an heavily armored arm (either Dr. Alchemy himself or one of his minions, it seems). Still, it's possible he survived this incident much like Wade Eiling survived his initial abduction by Grodd. Given that so far no photos of Savitar have been released nor has it been said who plays him, this seems like a possibility.
  • Jossed. We don't know who is Savitar but Ed is dead

Barry might not be entirely responsible for Dante's death
The timeline is a little wonky here, but bear with me. Barry traveled back in time to save Nora at the end of the Season 2 finale, set in May 2016. He then spends three months living in the Flashpoint timeline, until the events of the Season 3 premiere, when Thawne takes him back and kills Nora to 'fix' the timeline - that's in August 2016 (actually it should be October 2016 and a five month gap given that's how typically the timeline of the CW DC shows operate but anyway...). Now, Barry claims that he returned to "the moment he left" in 3x02. But is that the moment he first departed, in May 2016, or is it the moment he departed from the Flashpoint timeline, in August (or October) 2016. That makes a huge difference. Because, if its the latter, then Barry has no idea what happened in the last 3-5 months in even his original timeline, let alone this new one. For all we, and he, knows, Dante was destined to due sometime in the 3-5 month gap between seasons anyway and its not his time-travel specifically which f#cked things up in that regard.
  • I was actually thinking the exact same thing!
  • Lampshaded: In episode "Killer Frost", Iris points out to Barry that Dante might've died in a car crash regardless of what Barry did or undid.

Dr. Alchemy will turn Wally into Kid Flash
More or less explicitly foreshadowed in 3x02, where Barry claims that Dr. Alchemy will restore the powers and memories of all those who were metahumans in the Flashpoint timeline. That includes Wally (whom Barry was looking at knowingly when making this statement). At some point, Dr. Alchemy will kidnap Wally and for whatever reason, restore his powers and memories of the Flashpoint timeline. This will lead to some interesting moments between Wally and Barry, and Wally and the others - especially since now Wally might remember the life of the West family in the Flashpoint timeline, and also remember how the Rival sent him into a coma. Moreover, he might find himself dealing with a 'newfound' cockiness 'inherited' from his Flashpoint self.
  • Confirmed, sort of. While Alchemy's stone was what did it, Wally made the choice to use it.

Doctor Alchemy is actually Cisco Ramon
Cisco has suffered a breakdown in the wake of his brother's accidental death, and blames Barry for it — after all, Barry could go back in time and "fix" it, but hasn't! That much is canonically true.

So now Doctor Alchemy (possibly a splintered consciousness that even Cisco isn't aware of) is utilizing Cisco's cross-dimensional awareness and dimensional-rift-travel powers to empower and/or transport alternate powered versions of Earth-1 individuals here to screw with Barry and the rest of Team Flash. After all, let's face it, this show has a long history of bringing in a sort of trusted ally and turning him into the Big Bad for the season — and Julian Albert is waaaaay too obvious as an antagonist, both literally and meta-wise (they cast freaking Draco Malfoy as Albert, for crying out loud; could the writers be trying any harder to say "Look, magical villain who does villain-y things because, you know, VILLAIN!"), to be the true Big Bad.

Not that this won't stop Barry for trying to put the blame/suspicion on Julian, mind you, because Barry's not that genre savvy. The only way Barry will be able to resolve this — and it could well be that Doctor Alchemy's plan is to end up destroying the Multiverse, just like in Cisco's original apocalyptic vision — will be to go back in time and save Dante.
  • Jossed.

Wally will try to recreate the particle accelerator accident to give himself super speed

He did that in an older version of his origin story and in Young Justice, and Joe did encourage him to not worry and just focus on his studies. He might recreate the experiment with unpredictable results since he's just one ME student.
  • Could lead to some interesting development if he ends up either faster or slower than Barry and how he takes to hero work.
    • Jossed.

This show's Mirror Master is the son of the Earth-1 counterpart of the 1990 show's Mirror Master

Because of the alterations Barry made to the timeline, James Jesse is The Joker

People in Vancouver have stumbled upon the shoot for an unspecified upcoming episode of The Flash, which clearly shows Mark Hamill, but he doesn't quite resemble The Trickster as he appeared back in season 1 and 2—in fact, he now resembles The Joker!


Could Flashpoint have altered the timeline so that this criminal instead takes on The Joker moniker rather than The Trickster? ...Unlikely, I'd say. But hey, it's a possibility!

  • That's the Trickster of Earth-3, aka Jay Garrick's native Earth, who just so happens to look like the Joker (sort of an Actor Allusion, ain't it). The whole premise of Earth-3 is almost as if the 90's John Wesley Shipp show continued on to the present day, with all the campiness (and John Wesley Shipp, of course).

Harrison Wells from Earth-19 is from Supergirl's Earth

  • Can't be. In "World's Finest" (the Supergirl crossover episode), Barry's research reveals that there's no Harrison Wells on Kara's earth. Also, HR Wells comes from an earth with a Flash, and in which a war between metahuman armies was waged...none of this applies to Kara's earth either, as far as we know.
    • Officially Jossed in the "Invasion!" crossover when Cisco specifically refers to Kara's Earth as Earth-38.

The unnamed teenager from "Monster" will show up later
With his genius technological abilities he could become a huge asset to Team Flash or even the CCPD for that matter, who will reduce his sentence if he works for them.

Identity of HR Wells' partner on Earth-19

H.R. Wells mentions a partner on Earth-19 who was the real scientific genius behind STAR Labs. Possibilities for his identity-

  • Henry Allen. Why not? Maybe on Earth-19, Henry became a scientist instead of a doctor (alternatively, STAR Labs may be more heavily involved in pharmaceutical work). Would give JWS another role to play at some point, which is a bonus...
  • Julian Albert.
  • Ira West. Maybe on Earth-19, Joe was named "Ira" instead, and became a renowned scientist. This would be a nice Mythology Gag, as in the comics Iris' dad was scientist Ira West.
  • Ronnie Raymond. Would lead to yet more drama for Caitlin, if he makes a trip to Earth 1.
  • His sister, Helena G. Wells. She also does philanthropic work for a company based in South Dakota.
    • All Jossed. HR identifies his partner as a man named Randolph Morgan. We also see the image of his face, confirming him as not being a differently doppelgänger of Henry, Julian, Joe, or Ronnie.

Dr. Alchemy is the new timeline's version of Henry Allen
And he will directly battle his Good Counterpart, Jay Garrick.
  • Jossed.

Barry will return to Flashpoint to stop something caused by Alchemy, which will result in a more Crapsack World that is a bit closer to the comic event

Savitar is actually Barry

Because obviously the change in Savitar's design so that his identity is unknown (If he even has one, that is) means he will turn out to be someone significant. The previous season showed Barry becoming more and more obsessed with getting faster just so he could defeat Zoom, and it's possible he may feel the same way about this new villain who seems even faster and more dangerous than Zoom. What if in another timeline or even the future, he became so obsessed with speed that it would cause him to become the powerful villain.
  • Whoever it is, upon revealing himself to Killer Frost she immediately trusted him just seeing his face. The number of men that Caitlin would know enough about to immediately trust when he's claiming to want to help Killer Frost eliminate her Caitlin person would probably be numbered on one hand, and an Evil Barry is probably one of them.
    • [[Confirmed with a vengeance

Savitar is Wally West

IGN's review of "Magenta" posited the theory that instead of Dr. Alchemy turning Wally into Kid Flash like he was in the Flashpoint timeline, he actually turns Wally into the villainous Savitar. To quote Jesse Schedeen's review:

That said, Wally’s speed envy could bear some interesting fruit in the near future. Given what we know about Alchemy’s motives, it seems only a matter of time until the villain approaches Wally with a Faustian bargain. We know that Savitar is this season’s other major villain. What if Savitar turns out to be Wally? That would be an intriguing turn of events.
  • Jossed. Alchemy is working for Savitar.
  • Wally could still become Savitar in the future, as Episode 9 reveals Savitar is from the future and was trapped in the speed force by Barry. Savitar, speaking through Julian, revealed that one of Team Flash would betray Barry- which if Wally becomes Savitar, would be true.
    • Episode 15 has Wally, driven paranoid by visions of Savitar, open up a portal to the Speed Force to throw away the last piece of the Philosopher's Stone, only to end up being trapped in the Speed Force in Savitar's place as part of Savitar's Batman Gambit. This may or may not lend more credence to the idea.
  • Not to mention how Savitar mentions that Barry both helped create him (through the particle accelerator explosion) and he created himself (Savitar created Wally by giving him speed). And then there's the fact that Savitar chooses Wally, not Barry or Jesse, to torment in episode 15. Perhaps Wally will blame Barry for letting him get stuck in the Speed Force, and that resentment combined with the Nightmare Fuel from being stuck in the Speed Force will trigger a Face-Heel Turn. Why is he said to be the first human ever given speed? Well, we already know speedsters can time-travel...
    • Jossed, although the last bit is more-or-less confirmed.

Barry and Jay Garrick will recruit and assemble the Flashes and other speedsters of multiple Earths to defeat Savitar together, along with Jesse and Wally as well.

The "main" group would be:
  • Barry
  • Jay
  • Jesse
  • Wally
The other Earths' Flashes could be (based upon):
  • Tanaka Rei: the Japanese Flash who appeared on "Earth-D".
  • Danica Williams: the Flash from the Beyond universe.

Savitar messed with Barry's fixing of Flashpoint
Ostensibly, the only difference between the pre-Flashpoint timeline and the post-Flashpoint timeline is that Nora Allen died a minute or two later, which wouldn't seem to account for some of the more drastic changes, even considering For Want of a Nail (Julian's sudden presence in the crime lab being just one example of something that should have no causal link to Nora's death.) However, if Savitar was also messing with the timeline, it would explain why things are so different. And given The Reveal about Julian in "Killer Frost", it would make sense that Savitar would want to insert him into Barry's life.

Barry cannot defeat Savitar alone and will need the metahuman powers of Killer Frost and Vibe

Seeing as Caitlin should be able to slow every speedster down with her powers (and she did manage to save Barry from Savitar in Killer Frost), she could play an important role in the final fight, after she learns to control her powers better. Vibe in the comics can cut off speedsters from the Speed Force for a brief moment, so it's possible that he will learn how to do this in this season.

Both Caitlin and Cisco in theory have the powers to defeat speedsters and that could be the key in defeating Savitar.

Savitar is Eddie Thawne

Eobard Thawne is now alive and causing chaos, so unless it's not time remnant shenanigans or they didn't change the rules, Eddie could be alive now. Whatever happened to him after he was sucked in by the singularity, he came back as Savitar and needs Alchemy to fully return.
  • Jossed.

Savitar is HR Wells, who is actually Abra Kadabra
  • Interesting idea, but Jossed.

In the midseason finale, Barry will ultimately run back in time and save Dante.
In "Killer Frost" Cisco learns that Flashpoint may have killed Dante, which permanently strains his friendship with Barry. We also know that the synopsis of the midseason finale notes that Cisco spends his first Christmas without his brother, AND that Nicholas Gonzalez will appear as Dante in some fashion in the episode. As a Christmas gift, Barry may save his best friend's brother, despite knowing all of the potential problems that time travel can entail.

Alternatively, Barry will somehow take Cisco back in time to when Dante was still alive so that he can tell his brother that he loves him and have one last goodbye.

Keep in mind that the episode is called "The Present". This is likely a Double-Meaning Title, a play on words meaning both "a gift" as well as "the current place in time" (as opposed to the future, or the past). For the first meaning, that may involve bringing Dante back.

HR is his universe's Dr. Light
Heard on Reddit, don't really know if the comic version of the character uses this, but the guess is HR's drum stick is actually Dr. Light's wand.

Cisco's vison from "Shade" is not as it seems.
All we've seen is that Killer Frost and Vibe will have a showdown, but that only means they're on opposing sides, it doesn't say who's good and who's bad. In the present though, Caitlin's fighting for control of her dark side, while Cisco is much more bitter. He could be the one to turn evil instead of her.
  • It also doesn't say either are bad; there's no dialogue, just a brief shot of the two fighting using their powers which could, theoretically, be an Oliver-style full-contact training session. Or they could be fighting Savitar.
  • Either way, at the end of "Abra Kadabra", Caitlin has become Killer Frost again.

Jay Garrick will either die or be heavily injured by Savitar in the midseason finale "The Present"
Jay is essentially the Obi-Wan figure to Barry, and to really establish Savitar as a credible threat, he will successfully murder Jay Garrick. This is something no Big Bad to date has yet to successfully do to a major hero who's also a speedster, and so it will leave everyone, both the audience and the characters, in a major state of shock. The midseason premiere in January will then open up on a somber note with his funeral...and Barry may even take Hunter Zolomon's helmet for himself, although unlikely. This also creates extra opportunities for drama with Wally still wanting to help Barry out in the field, but now seeing the major dangers of the job first-hand.

However, the second option is still a possibility as well—he may be heavily injured, but far more so than Barry was at the end of "Enter Zoom", to the point where he's either in a coma or paralyzed across his entire body.
  • Jossed

Savitar's "prophecy"
So in the midseason finale, Savitar makes a prophecy about the future of Team Flash - one of them will betray Barry, one of them will die, and one of them will suffer a fate worse than death. Theories about each of these follow:
  • The one who will betray: Caitlin seems too obvious a choice because she is Killer Frost. They've implied Cisco's betrayal as well and he certainly has reasons, even if he's ostensibly forgiven Barry. HR Wells is again too obvious. Betrayal might come from a far more unexpected quarter - Joe West. What would cause Joe to betray Barry? Well, what if Iris was in danger and Joe felt Barry was responsible? Given that Barry's now aware that Iris might die in the next five months, what if Joe finds out that Barry knows, turns against him as a result and hopes to take down the Flash to save his daughter's life?
    • Seemingly Jossed as of "The Wrath of Savitar" (3x15). Caitlin is the one who betrayed the team, simply by keeping a piece of the Philosopher's Stone for herself, so that she could someday use it to rid herself of her powers.
  • The one who will die: This obviously seems to be Iris...as of this episode. Then again, as Jay said, the future isn't written. It could end up being a case of Equivalent Exchange where someone else dies to save Iris, or as a result of the effort to save Iris. Joe again seems a possibility, but given Barry's lost one father already, it isn't that new a direction (and a Joe who has turned against Barry makes for more drama). Could it be that the one who dies is HR Wells? Maybe he proves his worth to the team finally by making a Heroic Sacrifice? Also, in case someone is complaining that this is a re-tread - we've never actually had a Wells who was a major character die. In Season 1, it was actually Thawne who "died" and it was more a case of Ret Gone than death. The Wells he killed to replace was just part of backstory. And Season 2 Harry Wells is alive and well (pun intended!) So killing an actual Wells who's a heroic character would technically be a new move.
    • Jossed by Savitar himself in "The Wrath of Savitar," as he expresses scorn over the fact that a "coward" like HR survives his wrath in the future. Then again, this doesn't preclude the possibility of HR still dying in the effort to save Iris, or sacrificing himself, thus subverting Savitar's prophecy and his denunciation of HR as a coward.
  • The one who will suffer a fate worse than death: Caitlin's the obvious choice here if she's forced to use her powers in the battle against Savitar to the extent that she loses herself completely to the Killer Frost persona and becomes a full-blown villain - which would be a Fate Worse Than Death indeed for her.
  • For all three choices, Wally can be a candidate as well.
    • Now that it's known Iris is in danger at the end of the season and Barry is very not-forthcoming regarding training Wally ( there is a sneak peek of episode 10 out, where Wally stops Jared Marillo, the guy Barry saw on the news in his future vision, and Barry is pissed at Wally), it's possible Wally will eventually turn against Barry and join Savitar, maybe for the life of his sister. Why else would Savitar/Alchemy even try to unlock Wally's power, if not to make him an asset of his?
    • It would be weird to kill off the future Flash, especially after they just gave Wally his powers, but it's possible. Perhaps Wally pulls off a Heroic Sacrifice to save Iris. Or to save Barry, but he already tried that a few times.
    • Wally might be used as a vessel to bring Savitar back permanently. As mentioned above, there must be a reason they wanted Wally to become a speedster like he was in Flashpoint. Savitar could be looking for a speedster with enough power to take over and Wally is better than Barry was when he started.
      • This is confirmed in 3x15. Savitar was "inspired" by Flashpoint to turn Wally into a speedster for precisely this reason. Cisco now believes that Wally is the one who "suffers a fate worse than death."
    • In "The Once and Future Flash" it's revealed that Wally was so enraged by Iris's death that he took on Savitar alone, had his spine broken—thus lost the use of his legs—and was rendered catatonic by whatever happened. That would qualify as "worse than death". It could also refer to "Into the Speed Force" where Wally was forced to relive the worst moment of his life forever, until Barry got him out and Jay took Wally's place.
  • The series could also be Foreshadowing the specific people referenced in the prophecy by who is in the shot when Savitar mentions each part. If that's the case, then Wally will be the one who betrays the team, Cisco will be the one who "falls" (note that Savitar says falls instead of dies, although Cisco does die in the comics before the New 52 reboot), and either Caitlin, Iris, or HR Wells will be the one who suffers a fate worse than death).

Savitar is a future or alternate version of Barry Allen
In a series where time-travel and parallel earths abound, its only a matter of time before we end up with a situation where the Big Bad is a version of the protagonist. Now there are a couple of possibilities that exist here (and possibly many more)-
  • Future Barry: Possibly some version of the original timeline Barry from 2024 who fought Thawne and saved younger Barry in 2000. Its unknown what happened to him after that. Perhaps, after discovering that his original timeline was erased and replaced by 'our' Barry's timeline, this Barry grew bitter and resentful, even delusional, over time. He became more and more powerful, eventually becoming a God. He came to believe that the new timeline Barry 'stole' his life and so started to terrorize him across his timeline, eventually getting trapped in the box. Fun fact - doesn't Savitar at one point say "I'm the future, Flash"? Perhaps he meant to say "I'm the future Flash"! (Or, more realistically, referring to how he's Barry's future, in a sense). Also, its possible that this isn't what originally happened to 2024 Barry, but Thawne somehow did something to this Barry in 2000 (when he and "our" Barry returned there at the end of Flashpoint) that led him to become Savitar.
    • For what it's worth, Savitar says the "I'm the future Flash" line twice over the season and neither time do the subtitles include a comma.
  • Flashpoint Barry: The Barry who's native to the Flashpoint Barry who "our" Barry replaced/merged with when he created that timeline. Perhaps, somehow, Flashpoint Barry became a separate entity and survived the erasure of that timeline, and now blames Barry for stealing his life and then destroying his world. There's no reason why Flashpoint Barry would not have got powers eventually had the timeline not been erased.
  • Pre-Flashpoint Barry: The Barry who was seemingly erased when Flashpoint Reverse-Flash showed up.
  • A future version of current Barry: Maybe, much like the comic, Barry goes crazy after Savitar kills Iris and blames himself. He becomes a Knight Templar, and eventually Team Flash is forced to dump him in the Speed Force. After a Time Abyss, Barry eventually masters the Speed Force (becoming its "god") and sheds his human identity. Then he uses the Philosopher's Stone as a conduit to interact with the physical world, which leads to him getting control of Julian and the events of the Season. This neatly explains how he knows so much about Team Flash and their destiny, and also why he hates Future Barry — because he hates himself and knows what he's destined to become, and blames his past self for Iris' death and his eventual fate. The prophecy? The one who dies is Iris and the one who suffers a fate worse than death is Barry himself, or as he eventually comes to be known, Savitar. When Barry asked him who he was, Savitar didn't say "I am the future, Flash"; what he really said was "I am the future Flash."
    • "The Wrath of Savitar" (Episode 3x15) provides further evidence in favor of Savitar being a version of Barry. He claims that Barry was responsible for making him the way he is, while in virtually the same breathe claiming that he "created himself" — which taken together implies that he's Barry.
    • Though other characters like Wally and H.R. remain popular "candidates," the idea of Savitar being some incarnation of Barry appears the one that generally has the most support at the moment. This Reddit post even suggests that, given all the times Barry is specifically told he is not a god, a recurring theme of various characters have multiple sides to them, and Barry undoing Flashpoint because of Wally's death at the hands of The Rival, Savitar is meant to be a Composite Character of his comic book self and the previously-mentioned Future Flash from The Flash Annual #3.
    • And confirmed. Although when this Barry is from is still unknown.

Wally or Barry will pull a Heroic Sacrifice to trap Savitar in the Speed Force.
The prophecy states "one of them will suffer a fate worse than death", being trapped alone, in a space without time, with your worst enemy? And I Must Scream.
  • Wally getting stuck in the Speed Force is actually a plot point in the current DC Rebirth line in the comics.

Caitlin will fake Face–Heel Turn to infiltrate Savitar's forces.
The prophecy states "The one who will betray," to twist the prophecy to Team Flash's favour, and Screw Destiny.

Wally West will become Savitar.
The prophecy states that one of the team will betray them. What if Wally is the betrayer, but because he actually becomes Savitar? Think about it this way: Wally West->3B Savitar->Back in time (with box)->3A Savitar->Speed Force Barry stopped Savitar, but the reason he knew so much about Team Flash and the future is because he is Wally from the future. Wally seems so much faster than Barry, and in the past, speedsters faster than Barry have traditionally been villains. In addition, there was no reason for Savitar to make Wally into Kid Flash, since he's not a villain. Unless Savitar was ensuring that he comes into existence by giving his past self powers. So Barry's already stopped Savitar, and the rest of the season will be Wally becoming Savitar.
  • Jesse Schedeen (IGN's reviewer for The Flash) has this theory as well, so you both might be on to something...
  • Jossed

Barry will prevent Iris' death...
But Joe West will end up killed instead. This would follow the pattern set by the previous two seasons (Thawne killing Nora, and Zolomon killing Henry).

Wally will retrieve the Philosopher's Stone from the Speed Force
Because of the way Wally got his powers from the stone, he shares a connection to Savitar and Savitar will use that connection to make Wally retrieve the Stone from the Speed Force.

If Wally West becomes a villain, his costume will resemble the comic book villain, Daniel West a.k.a. Reverse-Flash.

"One shall fall"
As noted above, Savitar says "fall." While this is obviously implied to mean that one of Team Flash will die, it could mean "fall" in the Biblical sense of "Fallen Angel", which is to say "good guy turns bad". This essentially means that two people will betray Team Flash (unless the one who falls and the one who betrays are in fact one and the same).

Alternatively, "fall" may actually be in the literal sense of the word—a character will fall a great height and could be seriously injured, for instance, but non-lethally (and if it's a speedster like Barry or Wally, then their Healing Factor will take care of it anyway). Bonus points if that person is H.R. and thus much like the impostor of his Earth-1 counterpart, he needs to use a wheelchair.

Cisco will become Savitar
The vibe portals are very similar to the portals the speedsters make to travel through time or across universes. Also, the only two characters to create portals across space are... Cisco and Savitar. Cisco may be harnessing the Speed Force, since his powers are vibration based, and so he imparts it rather than using it himself. However, since he has possibly more power over it than speedsters, he could become a stronger speedster AND it would explain the "God of speed" thing, because Cisco actually controls it. Further support of this is that in the comics, Vibe is able to cut speedsters off from the speed force. Furthermore, he was able to talk to Barry while he was in the Speed Force.
  • It hasn't been ruled out yet, and his acquisition of a piece of Savitar's armor might mean he will use that to create more.
  • This troper isn't sold on the theory, but another point supporting it is the fact that Savitar is the Hindu god of "Motion" specifically. And what is the most basic type of motion? Vibration.
  • Jossed

They will defeat Savitar with a giant magnet
He's got a ton of metal armor on, so they just use a great big magnet to stick him in place.

Iris's death is just an illusion for another death.
Throughout this season, we keep seeing the idea of holograms pop up. H.R. had a device that could project someone's face, and in the last episode, Cisco fixes a working hologram. This seems to suggest that someone else will use Iris's image and die in her place. This whole illusion could be perpetrated by H.R., using Plunder's gun from the top of the building. But then the question becomes, who will die in Iris's place? There are two ideas I have:
  • Joe. When he finds out Iris will die, he will go to any length to protect her. Especially if Wally becomes Savitar, Joe would be willing to give his life for Iris's in a second.
    • Joe even asked about the prophecy and seems to be wondering if he can change it.
  • Caitlin. The goals right now are to save Iris and stop Caitlin from becoming Killer Frost. What if this was actually one solution? If Caitlin dies in Iris's place, she doesn't turn into Killer Frost and performs a heroic sacrifice.

Something bad will happen to Joe by the end of the season
In 3x10, Barry and Cisco vibe to the future and learn about some of the events of the next four months. While most of the character's futures are bleak to varying degrees (HR's STAR Labs Museum shuts down, Iris dies, Caitlin loses herself to the Killer Frost persona etc.) the one person who seems to have something good coming along is Joe (who gets felicitated for some reason). Now the team is focused on not only preventing Iris' death but all the other bad things that happen and they probably will succeed. So its possible that in preventing all those bad things from happening, they change Joe's future for the worst somehow in that he either dies, or his life takes a turn for the worse in some form.
  • Joe seems to be considering Savitar's prophecy now that he knows Iris will die. He may be looking for a way to change it to him.

If Team Flash succeeds in preventing Caitlin from becoming Killer Frost, or she manages to control her powers without turning evil, she will be the one to prevent Iris's death
In "Killer Frost'" Caitlin was able to freeze Savitar long enough for Barry to try to get away from him. If by the time Iris's death is about to happen, she hasn't turned evil, she can freeze Savitar again long enough for Barry to get Iris away from him.

It's HR who dies, not Iris.
Remember, he does have that hologram that can make him look like other people. Maybe this is how he gets that redemption he was hoping for.

Savitar teams up with the Black Flash and the Time Wraiths.
Savitar is the so called King of the Speed Force. So his potential servants are those who enforce it such as the Wraiths. And as of the Lo T episode Legion of Doom, Zoom has been zombified into the Black Flash and is hunting down Thawne because he's no longer meant to exist, but he does because of something Barry did. I believe that when Savitar returns, he'll command, brainwash or make some kind of deal with the Speed Force; that he'll hand over Barry and Thawne, the two speedsters that created and erased Flashpoint, so that neither Barry nor the Wraiths can interfere with his plans.

Caitlin is the last husk meta-human.
Caitlin does not seem to have had powers before Flashpoint, and I think at one point in season 2, she even got scanned with the Meta-human watch and wasn't a metahuman. Cut to Flashpoint, and now she's Killer Frost. It's interesting how she is struggling with sort of having two personalities in her head, more like Magenta than any particle accelerator metahuman we've seen. We saw Caitlin in Flashpoint as not Killer Frost, but this could be explained as Killer Frost being like that Caitlin's evil twin, who is the more direct counterpart of "real" Caitlin. It definitely seems as though the post-Flashpoint timeline started before Barry returned, maybe even when Julian first appeared the year before, and Caitlin's powers could have been restored then.

Wally is channeling his speed from Savitar.
Wally isn't actually connected to the Speed Force, because he got his powers in a different way from any other speedsters. He's actually channeling speed from Savitar, which will lead to Savitar's return. This is why Wally cannot save Iris, because it's his fault Savitar will return. He will be the "fate worse than death," losing his speed and his sister (or father, if the theory above is true).
  • Confirmed.

The returns of Rick Cosnett (Eddie) and Robbie Amell (Ronnie) will be as ghosts summoned by Savitar
Rick Cosnett and Robbie Amell have already confirmed that they will appear on The Flash later this season, and I think I know what capacity that will be. In "The Present", we learned that Savitar has a power very similar to that of The First Evil, in that he can manifest as the ghosts of loved ones of living people in order to manipulate them to further his own ends, like opening the box containing the Philosopher's Stone. We know that both Rick Cosnett and Robbie Amell are returning, so it will likely be in this form, to manipulate Iris and Caitlin, respectively. This also likely means at some point Savitar will appear as Henry and/or Nora to manipulate Barry in the same fashion, or Francine to manipulate Joe or Iris or Wally...again, it really will be a lot like season 7 of Buffy, I'm thinking.
  • Savitar does indeed manifest as Francine to Wally in "The Wrath of Savitar." However, the promos for the following episode show that Eddie and Ronnie (and Leonard Snart, for that matter) will in fact be apparitions inside the Speed Force, similar to in "The Runaway Dinosaur."

Gypsy is Cisco's genderswapped doppelganger.
She's the alternate universe double of Cisco, except that she's a woman.

Barry erased Hartley from current timeline
Or at least turn him back to villain. Because it's only reason that This Troper can see why Team Flash didn't ask him for help. Hartley either died or didn't redeem himself.
  • Check out the Headscratchers page for this — it's quite possible that they just don't feel that he can help.

The team will visit the Flashpoint timeline at some point
"Untouchable" established that there is a universe (parallel earth?) out there where the Flashpoint timeline continues (apparently because Barry chose to stay), and which Cisco can vibe. At some point during the season, for whatever reason (most likely something to do with Savitar), Barry, Cisco, Caitlin and possibly other team members visit this earth, which will lead to some interest scenarios and scenes-
  • Barry gets to see his parents again, which is always an emotional experience. But more interestingly, he might observe, or even run into, the Barry of this timeline - someone who's fully integrated into Flashpoint and doesn't at all remember being the Flash. This Barry may or may not successfully be pursuing a relationship with Iris, who most likely remembers who he really is and what he's lost by choosing to stay in this timeline.
  • The team gets to see a Kid Flash who's more confidant and experienced. Might be interesting for Wally, if he comes along, to meet his doppelganger. If Wally comes along on this trip, then Flashpoint Wally possibly wears another suit (perhaps something resembling comic-book Wally's current 'Rebirth' suit).
  • Cisco learns about how he's rich on this earth, and may run into Billionaire!Cisco. Much hilarity ensures! On a more serious note, Dante is most likely alive on this earth, which will lead to another emotional moment.
  • The team runs into Flashpoint Leonard Snart AKA 'Citizen Cold', who's one of Central City's heroes on this earth, and has a friendly rivalry with Kid Flash (Wentforth Miller does have that multi-series contract after all...)
  • We finally get to see Flashpoint Harrison Wells (giving Cavanaugh a chance to reinvent Wells yet another time!).
  • Maybe we finally get to know how metahumans were created in Flashpoint.

Joe is the one who will fall, While Julian and Caitlin will be the ones to betray them, and Wally will be the one to suffer a fate worse than death
  • While it is true that Iris West-Allen's death and Barry's subsequent journey to the 30th century to rescue his wife, is one of the most earthshattering events in the Flash Mythos, given that the writers have stated the love story between Barry and Iris as one of their favorite plots, as well as the pairing between the two has gained both critical acclaim and love from the fandom chances are she pretty safe to see the morning after. So during the showdown with Savitar, something will detain Wally, (more on that later), from getting to Iris, leading to Joe making a Heroic Sacrifice to save his daughter. In doing so this will no doubt create a rift between Barry, Iris and Wally, setting up a plot thread for Season 4, and that Barry and Iris will no doubt find their way back to one another.
  • Julian and Caitlin's relationship will go from mutual attraction to straight out love, and given the writers tract record on making Caitlin's life a living hell, when Savitar returns he will reawaken Julian as Alchemy, who in turn will complete Caitlin's transformation into Killer Frost, and the two will become acolytes in Savitar's cult, pulling those two out of the equation during the showdown with Savitar.
    • Also the shots of Vibe and Killer Frost battle from "Shade," will come true that same night, taking Cisco out of helping with the rescue attempt of Iris as well.
  • Savitar will prevent from Wally's attempt at saving Iris by throwing him into the Speed Force, and not the recreated Central City version like Barry went too, but the void that Savitar was imprisoned in by the Team, leading to a plot thread of Saving Wally for Season 4, which after coming back and learning about Joe's death he will also break ties with Barry like Iris.

Earth-2's Version of Eddie will show up as Cobalt Blue
Both Rick Cosnet and Robbie Amell have been confirmed to appear in upcoming episodes. Given that Eddie was a counter part of Malcom, and we never once saw his Earth-2's doppleganger, it seems rather likely that Eddie will have an Earth-2 evil twin much like Cisco, Caitlin, Ronnie, Dante and Laurel.
  • Almost certainly Jossed; Eddie was a Speed Force projection.

Iris will have a Disney Death after her death in the future vision.
Barry saw her being impaled by Savitar in front of his eyes, but he didn't see what happened afterwards, possibly hinting at her being brought back to life.

Savitar is a future version of HR
  • This is a little off the wall, but stay with me. In "The Wrath of Savitar", Savitar says that Barry was there when Savitar became who he is, implying that Barry will be a witness to the origin of Savitar. Savitar makes several comments that imply a personal grievance beyond just trapping him in the Speed Force (example: he becomes noticeably angrier when he calls Wally "another victim that Barry Allen failed to save"). That line could imply that he hates Barry for failing to save someone he cared about it. Now imagine this scenario: At some point in the future, Team Flash pays a visit to Earth-19 and someone close to HR (perhaps Randolph Morgan) dies. Blaming Team Flash for their failure to save him, HR somehow acquires the Philosopher's Stone and uses it to give himself speed powers and seek revenge. However, this does contradict Jay Garrick's earlier statements about Savitar being one of the oldest speedsters, but perhaps it's a Legacy Character situation. After all, HR could easily have taken inspiration from the story of the first Savitar.
    • Some other fans noticed that Savitar called Wally "Wallace" (which HR does also) and that both of them have a penchant for classical mythological references.
    • Jesse Schedeen of IGN would agree that this theory holds weight, for the reasons listed mentioned above plus the trend of having the Big Bad of the previous seasons be someone close to Barry.
    • There is also a precedent for a Wells being a villain (though in that case it was due to impersonation) and the previous two Big Bads were not only close to Barry, they were his mentors.
  • Jossed

Savitar's defeat will end with him dispersing into or expelling a (Speed Force-fueled?) lightning storm that causes another Mass Empowering Event.
For the majority of his appearances this season, Savitar has demonstrated himself to be on an entirely different level compared to all other speedsters seen so far, and even if not he's truly the "god of speed" he claims to be (seeing as he was trapped in "eternity" despite claiming to "rule" over the Speed Force), he's bound to be channeling an incredible amount of electrical energy judging by the white lightning he emits. These powers may derive from, or at least have some connection to, the Speed Force unlike the source material, but Savitar was also seen assuming his current form after obtaining the Philosopher's Stone/Brahmastra, which has been shown to grant metahuman abilities. Either way, if Savitar were to produce some sort of World-Wrecking Wave upon defeat in the manner described above (which parallels how Barry gained his powers), this would allow the show to carry on with an adaptation of what's currently going on in Rebirth—which the Arrowverse is likely to draw some inspiration from anyway—and bring newer speedsters like Godspeed and Fast Track (and the probable Cannon Fodder that is the trainees Fast Track oversees) into the fold along with (possibly) certain other lightning-affiliated DC characters who have yet to appear (and were not affected by the Particle Accelerator explosion). This also works as something of a Mythology Gag to how, depending on the origin story, Barry is the lightning bolt responsible for his powers—doubly so if Savitar turns out to be Future Barry.

Savitar is a corrupted version of Barry
Think about it: "You created me!" and later "I created myself," an almost saddened apology to Iris that he will have to kill her... In a way his failure to save Iris from himself hardened his heart and Barry grew to loathe his younger self and his friends.

The real Jay Garrick is or will become Savitar.
There seems to be a pattern where mentor figures turn out to be villains. And who advised Barry to throw the philosopher's stone into the speed force, which would free Savitar? Jay did. Savitar has a link to parallel timelines, because he could grant powers to people who changed between timelines. Jay stopped Barry from altering the timeline... the third time he did it. Why didn't he stop him before? Because the first two changes gave Savitar the chance to escape. Savitar mentioned a love of myths, particularly the myth of Atlas, a greek myth, to Barry. Jay Garrick's hat is inspired by the greek messenger deity Hermes, just like the name Savitar comes from the Hindu god of speed. Jay might be working with his future self, meaning that his life will be ruined when Barry and company stop him and Savitar. This would also give an alternate meaning to the "I am the future Flash" theory. Barry might also not have even spoken with the real Jay since he left for Earth-3, and instead Savitar had been impersonating him by taking off the mask or creating illusions, foreshadowing that Barry will somehow wreck Earth-3 some time in the future. Jay might also, in either scenario, end up replacing Wally in the speed force, then becoming Savitar within, because someone had to go in before Savitar, and before them, and before them, so it would make sense if there were a Stable Time Loop where Savitar's past self takes Wally's place. Alternatively...
  • Jossed

Both Jay Garrick and Savitar are a version of Barry's father.
Or perhaps more than one version, that a future Barry accidentally granted speed during Reverse-Flash's attack, actually making him the first speedster, explaining the incredibly unlikely coincidence that Barry's alternate father would be granted speed. Furthermore, every doppleganger so far has had the exact same name as their other version, which was a major point of the reveal in Season 2 with both being named Hunter Zolomon. Thus, Barry's father, who was killed by Zoom because Barry was "weak" could be the one Barry "destroyed," trying to destroy Barry, not to get revenge, but to "fix" him in some twisted way by putting him through everyone around him dying. So "Jay Garrick" might be a fake name that Barry's father adopted. Why? In The Flash comic books, the Earth-2's Flash's comic appeared in the first issue, indicating that the Golden Age comics' existence was canon, and so "Jay Garrick" could have gotten his fake name from a comic book.
  • Jossed

Savitar is Bart Allen.
In this universe, Bart is a villain who for some reason hated Barry and was faster than him to a dangerous degree. At some point in the future, Barry pushed him into the past to imprison him, hoping the trip to the past would remove his powers. Unfortunately, Bart regains his powers and tries to return to the future, only to be imprisoned once again by Barry. Pissed off, Bart wants to ruin Barry's life by killing Iris, knowing that it would kill him as a result of killing his grandmother, but in his deranged mind, he thinks it's worth it. Probably not gonna happen but it would be cool/horrifying.
  • Jossed

Savitar's identity will indeed be revealed at the end of Abra Kadabra
The episode teases the appearance of Abra Kadabra, a man from the 64th century who knows the identity of Savitar, because it's part of history for him—it's analogous to people in the present-day studying Ancient Egyptian rulers. The premise of the episodes teases the titular villain hovering that knowledge in front of Barry. The question is—will the end of the episode do a cop-out and make us wait even longer? I'm guessing not, because the show goes on hiatus for four weeks following this episode, so they'll probably try to leave on a high note, much like when Zoom's identity was revealed at the end of "King Shark" before going on hiatus for awhile. This season has already been on fairly rocky quality, and it would leave a really bad taste in the viewers' mouths if they had an episode that teased Savitar's identity, only to not reveal it in the end, before going away for four weeks. Hopefully the writers are smart enough to avoid a situation like that. In fact, unlike in the episode "King Shark", "Abra Kadabra" may even be in a way a Double-Meaning Title—referring both to the titular antagonist and to the way that a magical illusion has finally been shattered, so to speak.
  • Nope! They're really dragging this thing out, huh?

Instead of becoming Killer Frost, Caitlin will become the Arrowverse version of Ice.
Instead of becoming a villain, she'll find a way to get rid of the Frost persona and use her powers for good.
  • I was thinking something like this as well. Like, maybe Cisco vibes Killer Frost and ultimately there's a Battle in the Center of the Mind whereby Caitlin faces off against her evil self and wins, ultimately restoring the old Caitlin Snow personality and now letting her use her powers willy-nilly with no more fear of becoming evil.
  • The season 3 finale suggests that she no longer wishes to go by either "Caitlin" or "Killer Frost", suggesting this may be a possibility.

Julian will become F.I.R.E.S.T.O.R.M.
At some point during their fight against Savatar, Julian will come into contact with the philosopher's stone (or ore likely a fragment of it). This will lead to an unstable metahuman transformation in him. In an effort to save him, the team will inadvertently pull the remnants of the F.I.R.E.S.T.O.R.M. matrix (AKA Ronnie) from the speed force. This will serve as a way to revive Ronnie without creating a love triangle, and the powers of the philosopher stone will activate the transmutation powers in the Ronnie/Julian mix that we have seen in the Stein/Jax mix.

2024 Barry will become Savitar
In the upcoming episode "The Once and Future Flash", Barry travels forward in time to 2024 and meets a despondent older version of himself who's still affected by Iris' death. Its entirely possible that events occur in that episode which lead to 2024!Barry losing his mind completely and becoming Savitar, and 2017!Barry being forced to imprison him in the Speed Force. This would confirm Savitar's words earlier in the season when he claims that Barry is present when he becomes what he is (2017!Barry is present when 2024!Barry becomes Savitar), Iris needed to die for him to live (Iris' death is what puts Barry in a dark enough place psychologically that he ends up becoming Savitar seven years later), and that he needs Barry to live "a little longer" (2017!Barry needs to live long enough to travel to the future and participate in the events that cause 2024!Barry to become Savitar...but once that happens, Savitar's existence is divorced from that of 2017!Barry as the latter becomes a time remnant).
  • Jossed, possibly. 2017!Barry manages to get 2024!Barry out of his funk and start acting like a hero again.
  • And now completely Jossed.

Iris Is Savitar
When Savitar unmasked in the most recent episode, the person inside had dark skin & tied-back black hair.

A grown-up Sara Diggle is Savitar
This seems unrealistic, but hear me out. At the beginning of the season Barry created Flashpoint, erasing Sara Diggle from existence while placing in John Diggle Jr. in her place. Perhaps a fully adult Sara Diggle from an alternate timeline became Savitar to get revenge on Barry for erasing her existence. However, it's unlikely Caitlin would immediately say "What do you need me to do?" after seeing this, as for her it would essentially be a case of Stranger Behind the Mask. Still, I'm putting it out there as a possibility.
  • Jossed

Two Savitars?
So far his identity and origin is as confusing, flip-flopping and paradoxical as time travel itself. Some say that by using the P-Stone, he's the first person to become a speedster throughout the history of the Multiverse, meaning he's centuries old, or something to do with time travel. Savitar also mentions Barry is somehow involved in becoming a meta, yet he say's he created himself. Future Barry imprisoned Savitar in the Speed Force, but is this the Savitar before or after he killed Iris? The Speed Force trapped him in a time-loop reliving his most hellish moment, but manipulated Wally into helping him escape into the past. After Iris's dies, it takes Barry 4 years to imprison Savitar in the Speed Force...again? Maybe Savitar was imprisoned by future Barry in the timeline before Eobard Thawne killed his mother or before Barry created Flashpoint. The Speed Force protected Savitar's presence and memories from the temporal change.

Savitar is one of the time remnants that Barry will create...to stop Savitar
Would make sense and add some bitter irony to the story, as well as explain some of the dialogue. 2024 Barry already tells his past self that he'll create time remnants to try to stop Iris but it won't work. Most likely Savitar kills all of them except for one. Unfortunately Barry and his time remnant can't agree on who is the "real" one and get into some sort of conflict that ends with the time remnant (unknowingly to Barry) turning evil and becoming Savitar. It would explain why Savitar told Barry they were enemies because "only one of us could live" and also why he needs to leave Barry alive for now, since killing Barry before he creates him would wipe him from existence. It also explains why Savitar said he created himself.
  • The possibility of Savitar being a time remnant (whatever the origin) is likely because during the Eureka Moment montage the "time remnants" dialogue is specifically replayed. The full quote itself has an interesting set of Exact Words, which given the way the season has already used such a device ("I am the future, Flash") isn't likely to be an accident.
    You're even going to create time-remnants of yourself, but he's going to kill them all, mostly.
  • A possible scenario is that during the fight with Savitar, one of the time-remnants is disfigured but lives and becomes bitter that no only wasn't Iris saved but that he was created to make a heroic sacrifice that turned out to be meaningless, perhaps by being thrown into a time/space portal where he eventually goes nuts and becomes Savitar during a long period of time-travel through multiple universes (as Jay indicated Savitar had a long history there). Barry becomes the disillusioned 2024!Barry who never finds out that it was a time-remnant he created that eventually became Savitar before he managed to trap him.
  • And confirmed (at least Savitar being the time remnant that survived).

Savitar is the time remnant that Barry created in "The Race Of His Life" who supposedly performed a Heroic Sacrifice to stop Zoom's magnetar, having somehow survived and turned evil
Although we saw this time remnant supposedly die, they could just Hand Wave it that the magnetar or something allowed him to survive, corrupted him, and gave him powers or some stupid shit like that. This would also explain why the season 3 finale is titled "Finish Line", seemingly as a Call-Back to the title of the season 2 finale "The Race Of His Life". note 
  • Jossed. Whenever some version of Barry became Savitar, it was after the events of this episode.

Savitar will be revealed to be the Speed Force itself
It will turn out that Barry had corrupted the Speed Force to the point where it either gains a physical form to come after him. It could transform to look like other characters (maybe turning into Ronnie to get Killer Frost on his side). It's probably unlikely but how cool would it be?
  • Jossed

Now with Savitar's identity revealed...
Barry will propose stopping him by killing himself, as he realizes that much like Eddie Thawne, his death is the only thing that can stop this future supervillain and thus all the horrible things he does, including killing Iris.
  • OK, after reading a couple recent press releases how season 3 will end with a "show-changing cliffhanger that will leave the viewers and the heroes wondering how they can move forward in season 4", I am now convinced that indeed, this is exactly what will happen. It will come down to the wire, and Barry realizes that the only way he can stop Savitar from killing Iris is by killing himself first, erasing Savitar from existence. And he does it. This will be a nice Call-Back to Eddie—Iris' former lover—sacrificing himself to save Barry, something I correctly predicted two years ago (check the history on this page to confirm this). So the season will end with Our Hero Is Dead, much like season 5 of Buffy, and thus the season 4 premiere will be about bringing him back, but also in a way that doesn't restore Savitar. Maybe Wally runs back in time and plucks him from the timeline or something like that? I'unno. But let's worry about season 3 for now, and again, I firmly believe that Barry will perform a Heroic Suicide.
    • What would be even wilder is if Barry jumps in front of Savitar's spike that's meant to kill Iris. So his future self kills his past self, undoing his own existence and causing yet another Reality-Breaking Paradox, which is becoming quite common in the Arrowverse these days. Here We Go Again!
    • Or, this is what H.R. is doing on the roof with a futuristic-looking gun. Barry specifically instructed him that if he could not stop Savitar, H.R. must shoot Barry, killing him outright, in order to negate Savitar's existence and save Iris (just shooting Savitar himself probably won't work due to him being encased in his armor at the time). A break-glass-in-case-of-emergency scenario, and given that season 3 will end on a "series-changing cliffhanger", that's probably exactly what will happen.
  • Barry did propose this, but Savitar pointed out it wouldn't necessarily work, since Eddie's death ended up not preventing a time-remnant of Eobard from continuing to exist.

The Red Sky Crisis was the catalyst for Savitar's creation
  • We know that Barry seemed to make headway in getting his future self out of his funk over Iris' death.. a few months before he's fated to disappear. What happens to Barry after that has never been confirmed, maybe that crisis is what drove him over the edge into becoming Savitar.
  • Jossed. Savitar is a time remnant who originated during Barry's battle with Savitar in a Stable Time Loop.

Savitar's suit of armor has a mind of its own
Perhaps Savitar's suit is filtered with some Gideon-esque A.I. that allows the suit to pilot itself and obey's Future Barry's commands. Say Future Barry is without the suit, possibly trapped, the suit comes to life to save him. Cisco might quote "IT'S ALIVE!".
  • Confirmed, although sadly no Frankenstein quote.

In Savitar's timeline, Iris performed a Heroic Sacrifice of some kind.
  • Now that we know that Savitar is a future version of Barry gone off the deep end, consider a couple of things from earlier in the season. In reaction to the news of her death in the future, Iris said that she wanted to do something good with her life outside of being The Flash's girlfriend (paraphrased; I can't remember the whole line). With that in mind, it wouldn't be at all a surprise if she would sacrifice herself to save someone else. That timeline's Savitar became filled with grief and self-loathing because of his failure to save her, leading him to become obsessed with becoming faster and casting off his attachments to humanity. Remember, in "Into The Speed Force", the Speed Force showed Barry three people who had previously performed Heroic Sacrifices (Eddie, Ronnie, Snart) and tried to drill it into his head that their deaths were not his fault, since they had made their own choices. What better reason for the Speed Force to do that than to try and stop Barry from sinking into self-loathing and becoming Savitar?
  • Jossed.

The person we see getting stabbed at the end of "Infantino Street" isn't who it appears to be
  • At the end of the penultimate episode of the season, Savitar appears to successfully kill Iris despite Team Flash's best efforts to stop him. But of course, this is from Barry's perspective and we know he's not in on the full plan. In truth, at some point someone else switched places with Iris using HR's Earth-19 tech. In fact there's a good chance that HR himself was the one who decided to switch places with Iris since he felt it was his fault Savitar found her in the first place. This is also guaranteed to change the future since we know HR is supposed to survive Savitar's wrath.
    • This seems to be a common theory, but there's a problem with it: Yes, H.R. felt guilty about accidentally leading Savitar to Iris. But once Savitar got his hands on Iris in Earth-2—presumably the real Iris—then Savitar was with her the whole time until he killed her. How could anyone switch places with her? Unless Harry, Joe, or Wally had already switched places with her on Earth-2 before Savitar arrived...in that case my money is on Harry.
    • We see a wide shot of Barry firing the canon and Savitar zooming around, and this is where they could have swapped places just off the screen. That wasn't there in the original timeline. Other changes like Joe taking HR's original spot, so that it's been setup so that HR can conveniently flip places. It also makes sense for HR's arc, after HR being self-conscious about his use for the team throughout, that he'd give up and make the sacrifice. HR has just started a relationship with Tracy Brand, so the audience is meant to feel for them if he dies and she can be his successor. He's looks at a piece of Savitar's armour because Jessie used that to stab Savaiar earlier, and that's when he gets the idea that he can take the stab instead. And Iris doesn't say I love you this time, implying it may not be her. And it's possible that Joe is more subdued with his expression because he saw HR swap places.
    • We could see H.R.'s reaction to Iris' death in the extendet promo to the next episode, but it could be just edited to look that way. H.R. looked more concerned than shocked/terrified, so maybe it was the moment when he decided to switch places with Iris
    • Major spoiler alert: leaked photos from the set showed us someones' funeral and it isn't Iris', 'cause Candice Patton can be seen on photos. Tom Cavanagh can be seen on photos as well, but that dosen't mean that he played H.R. in those scenes, he could play Harry. He even wears sunglasses, just like Harry did on Henry's funeral.
    • That someone other than Iris sacrifices themselves would play into the theme from "Into the Speed Force" when Barry had it knocked into his skull that he had to stop blaming himself when others stepped up and did a Heroic Sacrifice, first by the three dead people the Speed Force manifested as and then by Jay taking Wally's place. Iris being killed by Savitar wouldn't qualify for that because she's a victim in this instance. Someone stepping up and saving her by sacrificing their own life would, and suggests that the Speed Force was preparing Barry not go down a Start of Darkness due to angst over that sacrifice but to respect and honor the choice of the person who did it.
    • And confirmed. HR and Iris switched places when HR went to rescue Iris from Savitar and Killer Frost. Iris-disguised-as-HR looked stricken because she'd been knocked out in the rescue attempt, and only got there in time to see HR get stabbed.

     Post Season 3 Pre-Season 4 Theories (SPOILERS FOR THE SEASON 3 FINALE) 

Wally and Jesse will be the new speedsters for the show.
Someone needs to look out for central city now that Barry's stuck in the speed force. This will be how the show handles the shift from the Barry Allen era of comics to Wally West taking up the mantle of the Flash. Since Jesse no longer needs to fill in for Jay, she will also return and their relationship will be explored.

It will take one episode for Barry to come back.
It only took one episode to rewrite Flashpoint so it wouldn't surprise me if he was only gone for an episode.
  • Confirmed.

  • In an act of brilliant marketing, The Flash (Ezra Miller/Barry Allen) of Earth-?? will temporarily fill in for The Flash (Grant Gustin/Barry Allen) Earth-1. The other reason Barry Allen/Ezra Miller was so quick to accept Bruce Wayne's offer. The Team Flash experience.

Wally will graduate from Kid Flash to THE Flash
And there will be a funny moment when Barry comes back and questions the whole "two guys named the Flash" thing.

Barry's doppelganger will be reccuring (or regular) character in season 4
This is the easiest way to let Barry stay in the Speed Force and still have Gustin in the show. Same trick was done with Wells (twice) and with Henry-Jay, so it seems very plausible.

Barry will act as a Spirit Advisor for Wally via the Speed Force
This would be another way for Gustin to remain on the show whilst having Barry remain in the Speed Force. Wally will be able to see glimpses of Barry through his connection to the Speed Force, and Barry will give Wally advice as he learns how to be The Flash. This could even involve Wally never being truly certain whether he's actually hearing Barry speaking or is just hallucinating or something - and could lead into an arc whereby Wally realizes that Barry is contacting him, and thus Team Flash would begin working to bring Barry back. Related to that...

Barry will not come back for most of the season
Maybe this is just wishful thinking on my part, but I think it would be far more interesting for Barry's return to come after a longer arc throughout the season, where Wally has become the protagonist and has had time to develop as a speedster and hero in his own right. It would also lend more emotional impact to the moment when Barry does return. And maybe they could even work in Bart Allen arriving from the future to help Team Flash rescue his grandfather from the Speed Force...
  • Jossed. They promptly pull Barry out of the Speed Force in the first episode.

Barry is being tested to see if he wants to come back.
The Speed Force assured Barry and the others that he wasn't being taken to the "hell" that was Savitar's prison. If Barry is taken to essentially a heaven for speedsters, then the test could be if he's willing to give up what he perceives as a utopian paradise in order to return to the pain of the real world. This would compliment the other test he was implied to have been given—would he do the right thing even though things seem to be going wrong. This would test whether he would do the right thing even when everything seems to be going right.

Caitlin Snow will call herself Ice Maiden (or just Ice).

Barry will get out of the Speed Force because The Thinker—the season 4 Big Bad—specifically wants to destroy the universe, and the best way to do that is to make sure no one is holding up the Speed Force from the inside
It would basically be a case of Bad Guys Do the Dirty Work, essentially the same way how in The Dark Knight Rises Batman was vindicated of the crimes that Harvey Dent committed when the Big Bad for that movie showed Gotham, in order to break their spirit.

There'll be a fight between Caitlin Snow and Grodd.
It'll be almost an emotional fight, because Caitlin tried to be his Morality Pet. But Grodd doesn't care anymore, to him a superpower Caitlin is just as destructive as any human being.

Black Flash will return and come after Caitlin Snow.
He still has some of his memories, so he knows she tries to kill him as revenge for tormenting Team Flash and fooling her into falling in love with him. And he desires to kill her the same way he killed Earth-2 Killer Frost.

Earth-2 Caitlin Snow was once a good person. She may even be the reason that most of Team Flash's Earth-2 counterparts are evil.
Since season 3 revealed that Killer Frost is an alternate personality that comes with the powers, it's possible that the same thing happened to Caitlin on Earth-2. She was once a very nice person just her Earth-1 self, but for some reason, her powers manifested earlier, and thus turned evil first. Likewise, instead of everybody trying to find a way to turn her good, it's possible that she manipulated everybody else into turning evil with her, especially since Julian wasn't with Earth-2 Caitlin. She probably turned Firestorm into Deathstorm first, since he was already going crazy, she just pushed him over the edge.

Wally will gradually lose his powers as a result of Savitar being erased from the timestream
Season 4 will open after a small Time Skip, with Wally taking over for Barry's duties as The Flash. For the most part, things seem more-or-less OK, but then Wally's powers will start to falter. Eventually Team Flash realizes what's happening: since Savitar was prevented from ever existing, he never travelled back in time to give Wally his powers; thus, this is a Delayed Ripple Effect. They realize that there's nothing they can do, and that eventually Wally WILL be fully Brought Down to Normal. This may then be part of their motivation to try and bring Barry back.

Det. Tom Patterson will appear again, with a somewhat bigger role.
He only appeared for two episodes. His first appearance made it look like he was gonna have an important role, but the last we see of him was him being a ungrateful ranter about Kid Flash.

The Speed Force will suffer a case of Break the Haughty
Between Barry escaping and possible sabotage from the Thinker, the Speed Force will be forced to ponder if it's really as all-knowing and wise as it likes to think.

At some point down the line, maybe in season 4 or even beyond, there will be a villain who knows of Savitar's story and attempts to bring out the darkness in Barry
We've seen this plot in fiction many times before. Essentially, while Savitar was completely erased from existence at the end of season 3, the horrifying fact remains that there still was a version of Barry Allen that became an outright supervillain who would murder the love of his life, and this fact cannot be changed. No doubt this will cause major drama going forward, as the heroes try to reconcile this. But what I think would be interesting is the presence of another villain (The Thinker, perhaps? Or any villain, really) who knows of this and tries to actually exploit it; they know Barry has the potential to turn to the dark side, and they will do everything they can to try and bring out the inner Savitar from within.

     Season 4 Theories 
Caitlin will eventually learn to summon and control Killer Frost at will
  • Based on "The Flash Reborn", Killer Frost is being treated a bit like the MCU version of the The Incredible Hulk: a split personality that comes out when Caitlin is angry, but can be suppressed through force of will. And the MCU version of Bruce Banner eventually learned to call on The Hulk at will and control it to a degree. Caitlin's character arc for Season 4 will be learning to do something similar with Killer Frost, allowing her to let go of her fears and use her other half as a force for good.

The division worked and Frost is improving because Caitlin can no longer dump all her negative traits on Frost nor can Frost dump her good ones in Caitlin
The thing is frost is deadly, and cruel, but snow despite the apprentwarmth and protection can be so much more subtley dangerous. Caitlin will take over the metahuman side to do something that even Frost thinks is far too cruel. And then shock everyone by pointing out she is a Killer Frost. Quick and deadly, but Snow can bury you alive. Amunet forget that once already. If Caitlin didn't try to keep a lid on her negative traits, it would have been so much worse than knock Amunet unconscious.

"Barry" is actually the Reverse Flash
The Barry the team got out of the Speed Force is actually Eobard Thawne, having altered his body to resemble the Flash a la "The Return of Barry Allen." The Thinker arranged for Eobard to replace Barry in the future, and just like in the aforementiond comic he truly believes he is Barry.

Jake Simmons/Deathbolt was one of the "others"
Three seasons ago, Arrow introduced its first meta-human villain, Deathbolt, who was not in Central City at the time of the accelerator explosion. Many believed that this would be explored later on, but even after three years, three seasons and Deathbolt's unfortunate death on The Flash....nothing
  • Seems to be Jossed with the reveal that the new metas were created three weeks ago when Barry returned from the Speed Force

The bus driver isn't gone for good.
  • There were twelve heat signatures present on the bus when Barry came out of the speed force. It stands to reason that one of them was the driver, who was revealed to be dead in Episode 4. Now, they haven't actually given us any information on the driver, and they haven't added him to the board. That means that unless they work him in posthumously, they'll only get eleven metas. If they don't work him in posthumously, then maybe his meta power brings him back to life. Either that, or the real bus driver had his death faked. Or it's all a giant case of Writers Cannot Do Math.

The season four finale will end with a public benefit attended by the heroes and the introduction of a new character:
The last shot of the season is a petite brunette named Sue introducing herself to Ralph.

The Speed Force knows that Cisco "tricked" it, but still willingly let Barry leave anyway
While the season premiere had quite a few complaints, one of the largest was this: We already know that the Speed Force is a Sentient Cosmic Force, and thus essentially a literal god...it is a sentient force of nature. So it just seems impossible for someone like Cisco to devise a way that can "trick" it into thinking it's still keeping Barry in the speed force prison. Grant Gustin recently gave an interview where he strongly implied that, much like with Flashpoint kicking off the last season before suddenly being seemingly resolved way too quickly, there's far more to this storyline that meets the eye that will be explored further down the road.
"Finally, when it comes to Barry’s time in the Speed Force that started this season, Gustin assured us that it matters moving forward. 'That was all very important, everything he said at the beginning of the year.'
So I'm guessing the Speed Force easily had the power to stop Cisco's scheme if it really wanted to, but it let them bring Barry back...possibly to fight The Thinker? Or perhaps because it knows this will play into The Thinker's schemes and just make things much worse in the long run, and so it wants to teach Cisco and co. a harsh lesson, that if they're going to bring Barry back, there's going to be deadly consequences?

Joe and Cecille's upcoming baby
  • Perhaps they'll choose the name "Daniel", making it the Arrowverse incarnation of Daniel West? While it would be a significant example of Age Lift, the use of time travel ultimately means a fully adult Daniel West still has the possibility of appearing in some fashion.

The Thinker wants to steal Barry's body
  • We know that Clifford is slowly dying as his body is giving out while trying to supply enough energy to his brain. Perhaps his endgame is to transfer his consciousness into The Flash, so he finally has a body that can supply enough energy to keep up with his vast intellect...or something stupid like that. Grant Gustin already said that things will take a dark turn in the middle of the year. Body snatching is obviously a very dark theme in fiction. And while the theory I'm proposing here seems to be a very common theory among fans following the episode "Therefore I Am", this may actually end up happening a lot sooner than we might think. Maybe the midseason finale will even end with DeVoe having successfully seized Barry's body, with no one else the wiser (yet). Thus, the back half of season 4 will be exploring this, complete with a new and much creepier Opening Narration. I'm probably getting too far ahead here, but he may even create a time remnant to be the "regular" Barry while he continues his plans as The Thinker in his home with Marlize. As I said earlier, I thought of this theory myself, but others have come up with it as well.
    • Partially jossed. He did intend to steal a new body to survive, but it wasn't Barry's. His chosen host was Dominic Lanse for his telepathic abilities.

The Thinker settles for stealing Ralph's body
  • The plasticity of Ralph's body is emphasized constantly, and DeVoe's body is failing due to his brain stealing power — specifically, bioelectricity — from the rest of his body. While Flash's body has plenty of electricity to spare, Ralph's body presumably no longer needs it in the first place. With both these options in mind, Flash is obviously the better choice due to powers, but Ralph's is suitable in a stretch.
    • Jossed. See above.

Dawn Allen Has Already Appeared
  • In the "Crisis on Earth X" crossover, Barry meets a young caterer (Jessica Parker Kennedy) who seems very eager about this wedding and quickly denies Barry asking if they know each other. This is actually Dawn, Barry and Iris' daughter from the future who, whether by accident or design, has traveled back in time and can't help seeing her parents getting hitched.

Patty Spivot will return
  • Rather than revealing Barry's secret identity, Team Flash will combine Patty and Ralph's combined investigative abilities to prove his innocence.

Marlize will turn against her husband.
As we've seen in "Don't Run", she seems to have second thoughts about transferring her husband's mind in another body. Also, she feels that she's looking at a total stranger. It's the one thing DeVoe didn't anticipate. When she explains herself, DeVoe kills her, deducing love as a weakness.

"The Trial of the Flash" storyline will be easily resolved in the tenth eponymous episode.
They already quickly solved greatly changed status quos in "Flashpoint" and "The Flash Reborn", so it's not a surprise if they do it again, with Barry leaving prison, and having a greater resolve to stop DeVoe. Also, this prison storyline could seriously clash with the lighthearted tone of Season 4 if they keep that going for more than one episode.
  • The easy resolution? That despite the Orgy of Evidence, nothing we saw in the midseason finale seriously implicates Barry. Among other things:
    • Barry's fingerprints are on the knife, but not on the blood.
    • Barry himself supposedly triggered and turned off his apartment alarm within minutes of the police's arrival. This doesn't give DeVoe much time to die, much less for his body to cool.
    • DeVoe's body was already dead when stabbed, and the "killing" wound leaves little blood in the apartment, on the victim, or on the presumed killer. An autopsy should presumably confirm.
    • DeVoe's body is in Barry's apartment, but no sign of his wheelchair.
  • Ultimately, this parade of obvious red herrings suggests the writers wanted DeVoe to slow Barry down or risk exposing the Flash's secret identity, not seriously arrest him. While Barry's history with DeVoe is more than enough to publicly force the police and district attorney into pressing charges, any defense lawyer could pretty easily rip this to shreds with just the information we've already seen on-camera.

     New heroes that might appear in Season 4 
Possible Superheroes that will appear
Since Barry created a new darkmatter event that caused those inside a bus to become Metas, here might be the new array of heroes that will fight alongside him.
  • Elongated Man (Confirmed)
  • Crimson Fox
  • B'wana Beast
  • Black Orchid
  • Detective Chimp
  • Captain Atom

     Future Season Heroes 
Future heroes that could appear and be major focuses for the season where they show up.
  • Green Lantern- Hal Jordan obviously if going by prior teases. He could arrive on Earth after having finished his Lantern training and would have to readjust to his life after his disappearance. The story could focus more on the cosmic side of the DC mythos and the overarching plot would be about him investigating non-green power rings that have been going to random people. Plus who wouldn't want to see one of DC's iconic friendships formed.
  • Power Girl- Wells notes in Crisis on Earth-X that there's a Kara for every Earth in the multiverse. Her ship gets discovered by the Star Labs crew and Barry mentors her in how to use her powers because Superman hasn't appeared on Earth-1 yet. At one point there will be a discussion about simply sending her to Earth-38 to learn her abilities before she resolves to fight for her Earth.
  • Captain Atom- Way back in Season 1 Cameron Scott was mentioned as a contact for Plastique so the trail is there for a full jump. Also it would be a good way of revisiting the General Eiling story and possibly kickstarting a plot about the government going on the hunt for metahumans.
  • Aquaman- Atlantis exists on Earth-2 and a deleted scene mentioned Barry looking into a guy that could talk to fish. Aquaman could be looking into how to prevent a war between his kingdom and the surface or he might attack ARGUS to retrive Atlantean artifacts. It would be a good way to bring magic into the show.
  • Wonder Woman- Diana was a contact for the Earth-2 Barry, Cheetah was being held by ARGUS, and Themyscira was shown on Legends of Tomorrow. She may show up because of interest in superpowered beings and would also bring magic into the show.
  • Zatanna- Would represent magic and is the only Justice League Detroit member to not even be hinted at yet in The 'Verse.
  • Red Tornado- Cybernetic based characters haven't really been used fully in The 'Verse and it would be another League member being added to the roster. His story would be about the Morrow of Earth-1 creating the Red series androids and Team Flash having to stop them. It might even incorporate the Tornado Champion angle and thus bring in Adam Strange.
  • Static- A popular character who represents street level heroes and comes about as a result of an unexplainable metahuman boom.