Chapter 4 has, for the first time ever, Marceline is finally called out for her actions by the Candy People when her opponent, the titular antagonist, exposes her actions from "What Was Missing".
Chapter 10 has Marceline and Princess Bubblegum finding out that Alex has been watching their every move as well as being the Big Bad of the entire animated series all along. The biggest wham of this is that Alex is responsiblefor their falling out.
The Runaway: Zotu's encounter with the ex-Dai Li informant reveals that the Dai Li has brain surgeons in their forces, who tamper with the minds of political dissidents, effectively brainwashing them into obedience.
The Gathering Storm: During an emotional evening preceding the massive battle to protect the city of Taku from a legion of Fire Nation soldiers, Ain confesses that he abandoned the Avatar Monks because he accidentally killed his mentor, while Sai reveals that she is actually the heir to one of the greatest fortunes in the Earth Kingdom, the daughter of Lao Bei Fong, one of the EK's regional governors. Then, during the battle, Sakodi commits his first murder, against his friend Enri, who in turn reveals that Omashu has been conquered. After barely winning the battle, the group witnesses large plumes of smoke coming from the south, revealing that the Border Forest has been completely destroyed. Oh yeah, and after her first incapacitation, Jun admits to Indo that his wife is still alive.
The Inventor: The Fire Nation's firearms have been completely destroyed, at the expense of the life of their inventor, who was ordered to be executed by Kyasin.
The Battle of the Citadel, Parts I and II: Indo reunites with his wife, Xira, who reveals that the brain surgeons of the Dai Li were originally the servants of the FN Royal Family, and thus it is concluded that Aizo ordered that Zotu's memories of his mother be expelled. The Avatar seizes control of Ain and uses its immense power to demolish the Fire Nation Naval Forces, killing thousands of soldiers. However, as the waterbenders are celebrating their victory, word is received that while the battle was taking place, a legion of soldiers swept through the remains of the Border Forest and up the coast, having claimed nearly all of the Earth Kingdom, aside from Ba Sing Se.
Heta Oni, an Axis Powers Hetalia fangame, has episode 16, which ends with Italy dead (or in a coma), where it's all dark , and he hears someone. He wakes up in a garden, and sees that HOLY ROME is the one he heard. Cue shocked silence of Gerita fans everywhere.
Downfall has Chapter 19. Rukia dies. what makes it even more of a sucker-punch is that, up to that point, this AU's differences were were mostly characters being alive, when they ought to have been dead.
The ending of chapter 19 is also a bit whammy. Gilda returns and strikes Firefly down, seeking a final confrontation with Rainbow Dash to determine which of them is number one.
Apprentice in chapter 9 when the original Dr. Robotnik is resurrected.
Becoming Ponies has Becoming Fluttershy, chapter twenty, in which Erishy is almost killed by anti-pony terrorists and gains the Element of Kindness.
"Dynamics of a Point", the first episode of the three-part finale for Children Of Time. Sherlock Holmes and Dr. Watson break their friendship, Holmes shows an unprecedented dark side to his character, a canonical case goes terribly wrong, and the Hidden Villain reveals himself at the end.
From the same Part, Chapter 25 where Cackletta reveals that the Kingdom Hearts universe was in fact consumed by the Realm of Darkness long ago, a process that occurred after Xemnas killed Sora and Riku and absorbed their hearts into his own body.
Then there is Chapter 26, where Cackletta talks about how everything up until this point in time was all part of her plan to acquire the Elemental Overlords powers for herself or create a new Dark King
The Cries Of Haruhi Suzumiya: Chapter 3, "Keiichi"note Seeing as the original chapter names are essentially gone, it's the last "section". Keiichi appears and almost beats Kyon to death. Then Haruhi shows up, and proceeds to blow Keiichi's head off. The chapter ends with Haruhi sinking to her knees, laughing maniacally.
The Death Note/My Little Pony: Friendship Is MagicFusion FicDeath Note Equestria has chapter 12, which is fittingly styled as a season finale: Following Ray Painter's death, Rarity suffers severe Sanity Slippage until she finally snaps when she deduces that Twilight Sparkle is Kira. She then takes Pinkie Pie hostage and threatens to kill her if Twilight doesn't confess on a live broadcast directed towards L's investigation team. Things spiral out of control, and Rarity ends up actually killing Pinkie while attempting to kill Twilight; when she realizes what she's done, she kills herself. And then we find out that Twilight engineered this entire sequence of events with the power of the Note in order to create a scenario wherein she could earn enough sympathy to be allowed on the team. Byuk is as stunned as the readers.
How about chapter 14's reveal that the Second Kira is Fluttershy, of all ponies, who kills Sweetie Belle to make an example of her.
Chapter 23's ending strongly implies that Applejack is the Third Kira.
Then Chapter 25 has L deduce that Third Kira is actually all three apple siblings, and they've been coerced into the role by Granny Smith's murder.
Chapter 26 confirms this... and then implies that there's a Fourth Kira out there.
Chapter 29 has the L Team/Coalition of Justice, with help from Princess Luna, set up a sting to expose the Tri-Kira, in the process ending up having to detain Straw Bolt when he unknowingly interferes; Rainbow Dash becomes convinced that Twilight is Kira and breaks off from the team; Applejack takes on the Eyes of the Shinigami, but is captured and nearly beaten to death (by Derpy, of all ponies); Mer uses her Death Note to reveal herself to the team, and the cliffhanger suggests that she's restored Twilight's memories and exposed her to the team.
Chapters 30-31 see the resolution of both Twilight's Memory Gambit and the Gambit Pileup between her, L, and Mer, resulting in the deaths of Applejack, Big Mac, L, Bon Bon (who turns out to have been a changeling) and Mer. Oh, and it turns out there never really was a Fourth Kira, those deaths being set up in advance as part of the Gambit Roulette. Though then one of the Death Notes ends up in Rainbow Dash's possession...
Fallout: Equestria's 39th chapter. There is so much in this chapter that just hits the reader, it will not be a surprise if they are left a blubbering emotional mess by the end. In a list of things that happen, Twilight Sparkle returns, if only for a moment, and just long enough for Little Pip to give her Pinkie Pie's final message. Steelhooves, who had been established as damn near invincible, is swiftly killed in a brutal manner. Velvet Remedy becomes an emotional wreck after all that she has seen and done in the Equestrian Wasteland, and the discovery of Fluttershy's greatest secret is what finally breaks her. The Canterlot Ruins is destroyed, killing all of the ghouls living there, including Twilight Sparkle's mother. Friendship city is blown apart. To wrap it all up, Ditzy "Derpy Hooves" Doo sacrifices herself by nearly performing a sonic rainboom and attracting missiles to protect her hometown of New Appleloosa, and more importantly, her adoptive daughter Silver Belle. Wham episode indeed...
The last part's not as depressingly whammy when it's shown that Ditzy's alive and the rainboom cleared enough clouds to bring down the Enclave warships.
The 24th Wing of In Flight. It revealed most of the skeletons hiding in Shirou's closets to his rather idealistic flock, and boy that is a large closet.
He'd managed to keep magic out the explanation, though... until the next chapter when a Fraga magus attacks the Izumo Inn, seriously injures Miya and forces Shirou to reveal his magic. And now we can say that they've seen his skeletons.
Turnabout Storm has several wham "chapters" all over its long episodes, as it would be expected from a work with murder mystery as a central plot point. For example, Part 2 ends with a desperate Shoot the Dog move by Phoenix that causes, among other things, him and Twilight going separate ways. Part 3 - Phoenix ends with Phoenix backed into a corner as one of the most important pieces of evidence he collected becomes a double-edged sword for him. And Part 3 - Twilight has the reveal that Trixie's involvement as a prosecutor in the trial might not have a motive as straight-forward as first believed.
When There Was A Tomorrow: Chapters 10 and 11 are back to back Wham Episodes, revealing that Balak, the Blood Pack, and the Reapers have thrown their lot in with The Covenant.
Chapter 14 sees: the possible deaths of Tali and Colonel Ackerson.
In chapter 27 Ginny is nearly skewered by the Witch King and is saved by Denethor wielding the Sword of Gryffindor.
In chapter 31 Emrys is revealed to be the grandson of Merlin and Nimue. And is part Maia. He unlocks his heritage and begins to kick ass on an epic scale.
In chapter 32 Harry dies and Ginny wields the Sword of Gryffindor in battle.
In chapter 34, the Chekhov's Gun of the weeping elf and Harry's slightly more than human reflexes are fired. Harry is actually Only Mostly Dead. And is descended directly from Maedhros Feanorion. And Ginny and Ron are directly descended from Maglor, who has been freed of his punishment.
In chapter 36 Saruman prophesies a dire warning and Eirian punishes Wormtongue by making him unable to die until he achieves redemption, no matter how many mortal wounds he sustains, along with three marks of Cain
In Chapters 1 and 2 of From Out of the Shadows it is revealed that Morgoth is the latest Big Bad, Earendil has been knocked from the skies and his Silmaril taken and Merlin and Nimue are still alive and keeping an eye on events.
The Olympics arc of JLA Watchtower. What started as a relatively light-hearted Titans adventure turned very ugly VERY quickly when Hades declared the Pankration match between Antaeus and Nightwing to be to the death - and Nightwing lost. None of the players/writers save the person running the plot, the Nightwing-mun, and the Hades-mun knew it was going to play out that way. Cue a VERY active 20+ person chat room going to dead silence for five minutes as it sunk in.
Ditto with Ra's al Ghul's Plague. You know shit's hit the fan when you have the rookie member of the Arrow family giving CPR to Superman.
There was also "Cry for Vengeance" where Dr. Light had the entire JLA on the ropes, had cut off Green Arrow's right arm, and almost turned Ralph Dibny in a pile of melted plastic. Cue one Crowning Moment Of Awesome from Sue Dibny of all people, armed with a Green Lantern ring and beating the shit out of Light.
Chapter 2 of Demon King Daimao fanfic Keena & the Defendants of Constan Magic Academy has returning villain Mr X. looking like he might turn he tables after knocking down Keena, Lily and Michie, and attempting to kill Michie, then rape Lily. What happens next? Keena, usuaully a Genki Girl gets really serious and straight up fists him through his stomach to kill him, but her friends understand her as it was Justified.
The end of chapter 7 implies that Eiko is supposedly ruler of a parallel world.
Chapter 8 has Lily's backstory being revealed. Cue Tearjerker.
The Loups=Garous arc (starting in chapter 9) seemed to just be an ordinary Crossover arc. Cue fans of the movie of shock on how in chapter 10, Yuko Yabe never got murdered and was alive after all.
In Trouble, chapter 20, Butch had up and left Rivet City and has been gone for nearly two months. Paradise Falls is destroyed, and it appeared Butch may have died in a fire there. From that point on, Harkness' mentality is never quite the same.
Chapter 38: Harkness had just blown himself up via a pile of pulse grenades, when already standing on his last legs. The entire chapter is written in binary.
The Firefly fanfic Forward has a huge one in the Charity episode. What seems like a pro-bono mission for the crew of Serenity to protect some innocent villagers from marauding mercenaries turns out to be them running headlong into an insane, mind-controlling psychic who is controlling the villagers, and the mercenaries are sent by the Academy to kill said psychic. Said psychic is also a little girl, who ends up taking control of River, and Mal is put into a coma by one of the enraged, mind-controlled villagers.
Later, there's the Wrath episode, which piles on the whams in rapid fire. River has been recaptured by the Academy at the hands of a terrifying new "Merlin" psychic supersoldier. Then in a flashback it is revealed that River's brain has been "upgraded" by self-constructing nanotech to boost her psychic abilities, as well as implanting a receiver that will eventually allow the Academy to remotely take over her mind. And then there's the reveal that River being captured in the first place was a trap - by her - to get her in the same room as the official interrogating her.
In "The Game of Three Generals," the final installment of the Elemental Chess Trilogy, the Wham Episodes seem like they just don't stop. First, Fuhrer Grumman's office at Central Command is blown up...with him inside it. Then Roy Mustang (whom the readers know is innocent) is arrested for the crime. A trial ensues, which is gradually revealed to be a full-on sham complete with corrupt judge. At the end, Mustang is found guilty and sentenced to death by firing squad.
The specific chapter of the Harry Potter fanfic I Saw My Lady Weep that received the most reviews was Chapter 27 (entitled "In the Ashes and the Dust"), in which Ginny Weasley is suddenly cast into a Muggle emergency room, being a hair's breadth from death. Readers don't find out until the next chapter that she was involved in a car accident.
Chapter 27 from Harry Potter And The Nightmares Of Futures Past has Harry waking from a coma to discover that despite his previous efforts, Ginny has found Tom Riddle's diary and has been taken into the Chamber of Secrets. Things only get more intense as Harry and Co. storm the chamber, defeating the basilisk and destroying the horcrux, after which Harry finally reveals that he is from the future.And it doesn't stop there. When they enter Dumbledore's office, Harry figures out that Draco Malfoy was responsible for his coma, and that he and Snape conspired to break into his dorm (with Malfoy nicking the Invisibility Cloak). The Reveal not only gets Malfoy kicked out of Hogwarts, but as the next chapter reveals, also forces Snape to transfer schools. Oh and Harry finally gets some kind of confirmation that Ginny likes him.
Chapter 9 of the Homestuck Fanfic Not What We Planned On. John still has some vestige of his flying abilities; Sollux's eyes grow back; Mom, Bro, and Grandpa reveal that they remember playing Sburb as well, and so did John's grandmother when she was alive; all the adults who knew the guardians don't have a clue who they are; a shopping trip to the mall reveals that something is severely messed up with the people in this world; finally, Dave reveals the reason for the previous event: every person they've come in contact with, at least in the mall, has been a consort pretending to be human.
Shadows Awakening has Chapter 13: The heroes manage to defeat Kyosuke and Wong, and retrieve the Ring of Kur-Asan and use it take back Wong's stolen Talismans. However, before they can use the Ring to restore Jade, the Queen's corruption completes, resulting in the Tiger Talisman splitting Jade and the Queen apart. She strips Wong of his Shadowkhan powers, at which point Kyosuke reveals that they cut a deal in secret, and that the Queen has now earned his loyalty, setting her up as the new sole Big Bad.
Chapter 1: Aqua wakes up injured and amnesic in the middle of nowhere with only her Archenemy for company. Said enemy quickly claims that the two of them are on the same side, and it was one of Aqua’s True Companions who attacked her.
Chapter 30: Zhuang goes to check on Chang and his family, who haven't been heard from in some time (or seen by the reader since Vachir under Demonic Possession kidnapped Zeng and was about to kill the elephants' child), only to discover Chang suffering from Eye Scream while he and his wife are suspended from grappling hooks in their basement, allowed to slowly bleed to death and suffer while staring at the body of their son, all for Chao to feed on their spiritual pain. Chang warns Zhuang to tell the Furious Five and the others to stay away from Vachir. Meanwhile, of course, they're all facing the rhino at Chorh-Gom and discover Chao can raise the dead, in this case the Anvil of Heaven. This is immediately followed by Mantis discovering that Monkey was also possessed, followed by what appears to be Monkey killing him; this plot point isn't resolved until Chapter 42. And then the final battle with Vachir results in him and Monkeybeing freed of dark chi...but then the pinnacle collapses and Tigress and Tai Lung fall into the abyss.
An even bigger one in the Epilogue. After the Final Battle in the Garden of Time it's revealed the whole thing was a smokescreen meant to fake the deaths of Nanoha and the Testarossas. In fact Precia had already revived Alicia using the Jewel Seed mechanism that was thought to be a temporary life-support system.
Chapter 6. The true nature of the SUE threat is revealed, and the Himes are forced to go back in time to prevent history from being rewritten.
Chapter 18. It is revealed that not only is Bachiko a SUE, but so is Meiko. Yukariko betrays the group and puts Natsuki into a Lotus-Eater Machine, when Natsuki's powers give out. Shiho reveals herself as Mai’s attacker and tries to kill her, with Mikoto searching for Mainote Considering that in canon, she destroyed Shiho's Child and killed Yuuichi, this is a bad sign for Mai.
Chapter 21. The First District is destroyed, as is Miyu, thereby preventing Mashiro's plan from working. It is revealed that the Obsidian Lord is in league with the SUEs and is possessed by the Usurper.
The Marvel fanfic Not a typical Civil War looks at first like a standard Fix Fic : sure, there are some changes (the proregs, and especially Iron Man, acting less like douches ; Maria Hill jumping the gun more often ; a whole new subplot with Wolverine tracking down Nitro), but otherwise, the main events are kept, and the story unwinds the same way. So, we're heading to the same climax, with the Proregs and the Antiregs about to duke it out. Cue chapter 10... And Doctor Doom appears on a video screen for revealing that A) he actually orchestrated the Stamford Incident and, thanks to a mole in the SHIELD (surprise surprise, it's Maria Hill) and another in the Proreg side (a Doombot version of Hank Pym), he manipulated the events so that a simple disagreement between heroes would turn into an all-out war between two factions ; B) He also CREATED the Sentry thanks to a deal with Mephisto, and he's about to unleash him on their families and the world, before coming out and looking like a hero by stopping him (and considering how Secret Invasion ended, it would probably work) ; C) he released all the villains imprisonned in the Negative Zone Prison, and warned them that he hid a quantum bomb and that he would only teleport those who would be alive at the end of a fight to the death against the heroes ; and D) during this long reveal, he'd been pouring an undetectable knockout gas in the corridor where the heroes are gathered so that they wouldn't be able to put up a fight. And then, time for an epic ending.
Mass Effect fanficMass Vexations 2 has chapter 32, which really shakes up the status quo. Until that point, Author Avatar Art had been keeping the fact that he was not from the same universe as the other characters a secret from most of the Normandy's crew, including Shepard. When he deals with an Evil Twin originally from the universe he emigrated to in this loyalty mission, the twin's actions finally push Art over the brink, and he launches into a rant where he decries the evil twin and spills his secret without realizing it... in front of Shepard, who is not happy at this revelation. The fallout from this incident causes the entire crew to find out over the course of chapter 33.
Arc 2, Chapter 5, which introduces the Bonnes in the middle of chapters about Wily and the Powered Up Robot Masters.
Arc 3, Chapter 8, where Robert has a huge argument with Dr. Light, nearly shattering their familial bond beyond repair.
Arc 3, Chapter 11, which has a rematch against the Robot Masters wherein Wood Man reveals he's a Reploid, and Robert finally manages to let go of his hate. Tron then convinces Dr. Light to do likewise.
Arc 4, chapter 4, with Wily being released from jail and apparently reforming, an attack by Quentin Emerald, more details of Project Blues being revealed, Protoman appearing in combat for the first time, and Wily closing the chapter by mentioning Project Gamma.
The Arc 4 finale has Blues, in his Break Man persona, utterly curbstomping Bass, Wily being accepted onto Project Gamma, the return of the original Robot Masters, an introduction of a new character named Darian Darhk, and the reveal that Blues and Robert are brothers.
Almost the entirety of episode 4 is one, with Gamma being activated and defeating Mega Man.
Episode 7 has a huge one with the introduction of Bass and Treble.
Episode 9 is this, with super intense battles on both sides, the Robot Masters becoming stronger, implications that ProtoMan is doing a much better job leading than Wily, Metal Man being a mole, and the title of one chapter is "A Good Day to Die." Not only does Metal Man die... ProtoMan kills him. The epilogue also introduces the Mega Man Killers and has ProtoMan demoted from Wily's second-in-command.
Episode 10 has Mr. Black invading the Lights' home while Mega, Roll, and Rush are fighting the Killers, a very back and forth fight between the latter groups, and Bass interrupting the Killers when they gain the upper hand. The next chapter has Mr. Black blackmailing the Conduit, Kalinka being kidnapped to force Mega to fight the Killers, and in the climax Ballade dies. The epilogue has the confirmation that Janet is paralyzed, many events go from bad to worse, and ProtoMan is tortured by Wily.
Episode 11 promises major changes in the status quo; its title is "Things Change." As of chapter 6, Mega Man saw the full video of ProtoMan's activation, Roll had a talk with Bass and at least tried to change his ways, Bass is back with Wily, and Wily knows that ProtoMan betrayed him before. Then, we have an invasion of Washington DC, Mega Man temporarily giving up, and the full reveal of Mr. Black's intentions. Then, Mr. Black establishes himself as a good guy by saving the President, it's revealed that the Mad Grinder is powered by Bassinium, and Bass is decisively defeated. And then, at the very end of chapter 11, ProtoMan turns on Wily.
Episode 12 reveals the Conduit's master plan, which is a threat to the entire world, including Light and Wily. In chapter 4, Mr. Black is captured by the police thanks to Mega Man, Roll, and ProtoMan. And in Chapter 5, the Conduit casually mentions that there are two Jadous Spheres. The climax of the episode has the first Jadous Sphere shattering and Bass breaking Mr. Black's neck—though he lives. The epilogue has Mr. Black letting go of his hatred and vowing to honor Tonya's memory by helping others, starting with helping Janet.
Mega Man Recut has "Future Shock." It's been described as the keystone for Season 1.
"The Mega Man in the Moon". Duo drives off Wily and the Robot Masters, the Emergency Scanner is actually Galaxy Man, Senator King is revealed to be The Mole, we learn that the Syndicate is deliberately keeping the R.I.P out of America, and Duo and Ra Thor imply that there is a much bigger threat on the horizon...
"Prologue", and its Sequel Episode the "Generational Transitions" arc. The first reveals that Pinkie Pie is the same character from Gen 3, and is the Sole Survivor of that world, which was Retgoned by the Alicorns and Draconnequi to prevent universal collapse. The latter builds on top of this, also revealing that Celestia was G3 Star Catcher, and it ends with Twilight being given Razzaroo's Apocalyptic Log, which not only causes her to confront Celestia about Equestria's past, but reveals that the Interviewers are more than they appear.
"Mind Games 7": Not only is it revealed that Diamond Tiara's actions were what inadvertently finished her mother's Sanity Slippage, but also that Screwball then attempted to kill her, though now she's so lost in her insanity she can't remember it. Also, Discord drops his facade of kindness towards Diamond and makes his true intentions for her clear.
"Mind Games 8": Discord completely corrupts Diamond Tiara, and she releases him. Also, as per their deal, Golden Tiara is cured of her insanity, and upon remembering the above incident from when she went insane, has the expected reaction.
"Angry Cruel Love": The all-out battle between Discord's forces and the Dark World!Mane Six continues. Fluttercruel is revealed to be able to use the Stare (Discord ordered her to reserve it for a last resort) and Rarity's golems are revealed to be souls using her as a medium to materialize into the mortal plain through her powers. Rarity then kills Fluttercruel and takes the Element of Cruelty for herself. Meanwhile, Angry Pie and Twilight continue their fight, ending with Angry Pie tearing out her Element of Magic and leaving her for dead as she begins rapidly aging.
"Off Da Rails": Fluttercruel is revealed to have survived by Body Surfing into Sparkler's body. Then, Rancor literally stabs Discord In the Back, stealing Destruction's power for herself, before leaving to return to the Draconequi dimension. Discord, seemingly mortally wounded in the process, transfers his remaining power to Fluttercruel, who's suffering a Villainous Breakdown from this sudden shock and saying she'll kill everyone to protect her father and prove her love to him. Cruel proceeds to absorb the Shadows of Existence and turn into a full Draconequus, something the Passenger says isn't possible.
The back-to-back chapters "Ruined Pearl Necklace" and "Crushed Pearl Necklace" both count. The former for revealing Pinkie is slowly dying of Rapid Aging due to her Element of Rage being damaged and having Rainbow Dash return to the fray. The latter for revealing what happened to Cruelty — she was hit with ALL of Sparkler's memories when she possessed her, which unDiscorded her (no one, not even Discord himself, knew it but she was BORN Discorded), leading her further into insanity. On top of that, Pinkie Pie dies and Cruelty is killed once and for all (but at the cost of Sparkler's life), while Fluttershy's spirit takes Fluttercruel's soul to recondition her.
From the looks of things, the End of Days Arc is going to be a Wham Arc. "My Little Alicorn" has a Sea Pony deliver an ominous warning that an "Alicorn Witch" is on her way to destroy the world and that Discord actually made Celestia's prison a paradise and when she and Luna are released, they've been reduced to fillies and Celestia lost her memory. Then Shady's spirit shows up to try and get Discord to redeem himself and claims that, while she understands why Discord's considered a devil despite still loving him as her son, the Nameless Passenger is WORSE than he is! All this is in addition to the various hints being dropped about the Passenger's endgame in this and the previous chapters.
"Beating Up Discord" has Dark World!Discord finally die and the world revert to a more harmonic setting, but Discord is revealed to, on some level, regret his crimes and its implied that someone or something has trapped him in a "Groundhog Day" Loop. At the end, Pinkie Pie and her foals, playing a video game version of their friend's adventures, discover there's still a third disc left to play.
"All Things in Twilight" has Twilight, and soon after the others, finally shake off the Nameless Passenger's influence, forcing it to reveal its identity — an alternate Twilight-turned-Nightmare.
"Give A Reason" not only gives the Nameless Passenger a name — Nightmare Eclipse (though the heroes dub her Nightmare Paradox)—, but reveals how the "Groundhog Day" Loop started and that its been going on for what amounts to several hundred million years! On top of that, it's revealed that Paradox isn't an alternate Twilight but a potential future Twilight who wants Twilight to become her and continue the loop.
"All My Friends Are Here": The Final Battle with Nightmare Paradox begins and it's revealed that along the way, she's merged with versions of Fluttershy, Applejack, Pinkie Pie, Rainbow Dash, and Spike who went Nightmare, giving her a team of Psycho Rangers. The chapter ends with everyone but Twilight and Applejack disabled and Paradox and her Nightmares seemingly preparing the Finishing Move. The presence of Spike's Nightmare (Nightmare Banneret) also reveals the fact that any species can go Nightmare.
"Shining Armor 13" not only delves into the mysterious break ins that happened, but ends with Cadence revealing the Wolf is still after Shining and proving it's not all in his head, because she saw it too.
Part 1 of Clover's Gaiden Story reveals that Minty was actually Clover, Dandy, and their son combined by the world changing spell. It also reveals that Pinkie was Clover's imaginary friend.
"That Which Pierces All" sees Nightmare Eclipse and her Psycho Rangers defeated once and for all (along with every alternate version of her due to her merging with every Nightmare Purgatory the moment of their birth), but after the dust settles, Twilight's absorbed the purified Eclipse and undergoing Alicornification. Discord also implies that it's possible Alicorn!Trixie's Alicornification wasn't undone.
"Welcome Home": Twilight completes her ascension, becoming Amicitia, the Concept of Magic, Friendship, and Happy Endings, with help from Trixie/Anasi, who really did keep her own Alicornification. Twilight/Amicitia then helps Rarity ascend as well, becoming Liberalis, Concept of the Mortal World, declaring her the new Queen of Equestria and de facto Dimension Lord of the Dark World universe. In the process, the Elements of Chaos within Rarity are purified (and possibly destroyed), while a World-Healing Wave is released that removes the last of Discord's chaos from the world.
Shining Armor 14: The Wolf comes after Shining again, on the ship, it's heavily implied that Minuette is an amnesiac Time Lord, and the Hooviets threaten Twilight in order to get to Shining, mailing him pictures of her sleeping.
"Duel to the Death at the Dawn of Time": Twilight/Amicitia's "greatest foe" turns out to be a younger Cadence, who was convinced magic was inherently evil and tried to kill Amicitia to prevent its existence. After Amicitia barely defeats her, her Light of Existence goes to live a mortal life to teach her a lesson, while her Shadow somehow clings to sentience and is recovered by Pandora, who gives it its own Light, creating Chrysalis. Meanwhile, Amicitia is revealed to be the Benevolent Interloper, creating a Stable Time Loop to insure her own existence. Oh, and it's strongly implied she's the Interviewers as well.
Shining Armor 16-2: After light-hearted fun in part 1 of the chapter and a good chunk of this part, serious Mood Whiplash kicks in as the group finds the downed Defiant with all hands onboard (including Bond's parents) long dead, and more importantly discover that Makarov's endgame involves using chemical weapons to kill every dragon on the planet, including Spike, which would involve gassing Ponyville as well. And then, Makarov uses his powers to literally spring a ambush from nowhere and forces Misfit Actual to surrender themselves in order to spare the rest of the fleet. And when they do, Makarov forces Shining to watch as he subjects the rest of the squad to No Holds Barred Beatdowns, including shooting Running Gag's wing off. And the chapter ends with Makarov making some ominous remarks and knocking Shining out.
Shining Armor 17-1 is a big one: Shining Armor discovers that the Interviewers have been interviewing him on his way to Makarov's flagship and he's capable of knowing they're there, unlike anyone else. The Interviewers reveal that the SA Arc and the series proper run on San Dimas Time because Shining Armor's condition means he's in the past catching up to the present, destroying any sense of Foregone Conclusion. Makarov begins his endgame, starting a global war with an attempted dragon genocide, threatening to sever the connection to the Heart World, and traps the battlefield under his Iron Curtain, making him near omnipotent. The chapter ends with Shining Armor, after spending the chapter being Forced to Watch Makarov kill thousands of innocents, snapping, smashing Makarov's super weapon, and attempting to kill him.
Shining Armor 17-5: The Final Battle with Makarov has the WolfRet Goning him, undoing all of the damage he caused to the timeline. And the chapter ends with Shining ambiguously fading into light as the changes take affect.
Shining Armor 19.2: Shining is revealed to have literallynot existed before the start of his story and had to spread out both ways from that point, something even Celestia doesn't know all the details of. It's also revealed that Makarov's desmise does not seem to have gotten the Wolf off Shining's tail, and that Celestia can't protect him from it.
Dark World/Light World 38, "The Connection", ends the Dark World side of the Dark Word-Shining Armor mega arc, finally revealing how Dark World and the main timeline are connected, as well as revealing the true identity of the Interviewers. Amicitia, wishing to create a timeline separate from Dark World where Discord lost, without lowering to Paradox's level and overwriting Dark World's existence, takes the only action she can — she blows herself up, causing a Literal Split Personality that creates the Interviewers, and Shining Armor, who the Interviewers insert into the timeline (thus explaining the above Tomato in the Mirror situation), so that his familial friendship will give Twilight the strength to resist Discord long enough for Luna's gambit with the friendship reports to work. The chapter then ends with the Interviewers starting the first of the Reharmonized interviews, bringing the series full-circle and revealing that Dark World was essentially a Stealth Prequel to the main story.
Shining Armor 21.2: Sunset and Ranger are killed while participating in a joint effort to break up a mega-storm over Caruba. There's no pomp, no massive battle — it simply happens, shocking everyone in- and out- of universe.
The Powers Of Harmony has four back-to-back. First, Chapter 20 reveals that Hidden VillainBig Bad Cetus has been hiding in Rarity's font the whole time. Chapters 21-23 then combine to bring in and cement the story's Darkest Hour — first, Cetus manages to defeat Celestia and steal her body, and then proceeds to transfer Nightmare Moon's essence into Rarity's body, rechristen her Eclipse, and forcibly demote her to Dragon. Between the two of them, they then manage to curbstomp the Mane Six and their allies, killing Grovi, Strauss and Elo in the process. In order to keep them alive long enough to become powerful enough to defeat Cetus, Luna is then forced to scatter them across Equestria and the rest of the world.
Racer and the Geek starts out looking like a rather ordinary Rainbow Dash x Original Character romance fic — until chapter 3. That's when the gun ponies are introduced and things get much more interesting in a hurry. Kalash93 has a penchant for toying with expectations.
The Conversion Bureau: The Other Side of the Spectrum has a couple, but the defining Wham Episode of the story is certainly For Whom The Bell Tolls. It is the single darkest chapter of the story so far, and details how Queen Celestia corrupted the Elements, detailed description of Twilight's nearly THREE THOUSAND test subjects to make the ponification serum work without horribly disfiguring and/or killing the subject, and Luna turning into Nightmare Moon and managing to cow Discord into seriousness.
Naruto Veangance Revelaitons invokes and lampshades this trope, with the author announcing in advance which chapters will have major twists (although the twists tend to be The Untwist when they are not a Shocking Swerve). Some Dramatic Readings point out the Fridge Logic in announcing the presence, if not the nature, of the twists in advance.
Chapter 49: Sakura is killed and her resurrection is the prize for the tournament.
Chapter 56: The Council forces Ronan to join them to help destroy the world
Chapter 59: Sakura is once again pregnant... but this time Ronan and Naruto are the fathers
Chapter 66: Ronan destroys the world and dies, although he comes back to life in the next chapter.
Chapter 70: Note that the fic was originally set to end after 69 chapters. The author's stepbrother takes control of his account and writes an alternate ending in which Edfred returns the cast to normal and they kill Ronan.
Equal And Opposite Attraction has been fluctuating between WAFF slice-of-life and mind-raping Nightmare Fuel. Chapter 25 comes and Yunno and Chrono, who have been in New York, appear to have been attacked and the Asura can't do a thing to save them.
Chapter 5: Mar learns that Luffy was executed 20 years before she arrived in the One Piece world.
Chapters 21 and 22: The Disinfector turns out to be Trafalgar Law, who was in love with Madelyn as a result of her using her Devil Fruit powers. She also used said powers to arrange for Luffy's capture in an attempt to put Law in a better position to reach One Piece
Chapter 30: Madelyn is actually Mar's mother.
Chapter 32: Madelyn/Blake, Mar and Garreth have, together, the ability to wish the One Piece world back to normal... but as a result of doing so, Mar's parents will never meet and she will never have been born
Chapter 8: Professor Oak dies, and Ash and Pikachu go missing right before the Fearow attack the ranch.
Chapter 3: Dawn's Ambipom, Ash's Gliscor, Tracy's Azumarill, and Misty's Azumarill are killed by the Muk, Tracy goes into a Heroic BSOD after losing the backpack containing the Pokemon from Oak's ranch along with other necessary supplies, and Sabrina dies after teleporting everyone out of the city.
Chapter 8: Dawn suddenly demonstrates Improbable Aiming Skills while escaping from the Cloyster, Ash is impaled by one of their attacks while trying to protect her.
Chapter 2: Ho-oh survived his battle with Mewtwo, took control of his body with an orb of creation, and successfully convinced Kyogre (and by association most of the Pokémon of the sea) to join his cause.
Chapter 4: Celebi warns Lugia that Ho-oh will go to war with him and his coalition, then tops it off by revealing she knows how the war is going to end and can't remain in the timeline because of it. Then Lugia reunites with his brother and realizes that he's still angry with him for denying him a mate of his own, and is also going to join Ho-oh's cause.
Chapter 7: Ho-oh, hoping to take Regigigas' orb of creation, does battle with him and the Regi Trio; the battle is massive enough that it wipes out most of the surrounding area. After the battle, Regigigas reveals to Ho-oh that he's not the original, meaning that Lugia has long since taken possession of the orb.
Chapter 9: Uxie, after joining Ho-oh, quickly explains to him why each of the legendaries will join their respective sides, reveals that he knows where they will likely end up, then when left to his own devices, he realizes that he has the resources to clone Ash.
Chapter 4: Whitney goes into a Heroic BSOD after seeing the carnage at the ranch, and Solidad falls to her death to give Harley a chance to escape from Raikou.
Chapter 6: After nearly killing the Johto group out of bloodlust, Ariados sacrifices himself to save Harley. The chapter then ends with the entire group surrounded by a massive pack of Houndoom.
Chapter 2: Uxie declares that the only way to prevent the planet from being further damaged by Pokemon such as the Muk is to wipe them all out, and Ho-oh only goes along with it because he doesn't want Uxie to take charge of his cause.
Chapter 8, when John is mutated into a Winged Humanoid, completely changing the way the others deal with him from then on.
Chapter 15, when Ringo suddenly crops up with telekinetic and clairvoyant abilities, and John flies in front of the others (who had convinced themselves that he couldn't actually fly), setting off the Fans' efforts to bring the others up to speed.
Chapter 25, when Jeft reveals that he was the moving force behind the Vasyn quest and that everything Shag and Varx had believed about the quest was a lie.
Chapters 31-32, when Grunnel betrays the four and they are kidnapped or depowered.
Finally, the end of chapter 32, when Shag and Varx inform George and Ringo that everything they all (even Jeft) believed about the ultimate purpose of the Vasyn was a complete lie, and that rather than remove the curse on Ketafa, its real significance was to remove the Dalns gods and bring in the Pyar gods.
Episode 74 of Sonic X: Dark Chaos, fittingly titled "The Mystery Revealed". Sonic and friends - and a crippled Tsali - land on Cosmo's devastated home planet Seedrius. They soon discover a vault of stolen Demon data files hidden in underground tunnels beneath the same research facility where Tsali was made. These files reveal that Maledict was literally manipulating everything in the backstory, from the destruction of the Seedrians to the entire Metarex war, and it was all part of a gigantic Gambit Roulette to end the Eternal War and conquer the universe.
Episode 75: The remnants of the Metarex join with Sonic and friends to rescue the surviving Metarex leaders and Tsali, who betrayed Maledict after the previous episode. A climactic final battle begins between Maledict and everyone else. And then Dark Tails steals the Chaos Emeralds, manifests himself into the physical universe, and becomes a god.
The Star Trek: Enterprise fanfic series Endeavour by Rigil Kent: it isn't 'til you're several books into the series that it's revealed that Malcolm survived Elysium.
And the Star Trek: Enterprise fanfic Divergent Paths by the same author: thanks to time-travel being well-established in Star Trek canon the Xindi attack Earth with the finished superweapon.
And chapter three of the Star Wars fanfic The Unseen War II: Shattered Dreams by the same author: Winter, Tycho, Han, Jacen, and Jaina all appear to have been killed when the Millennium Falcon was ambushed.
Luminosity diverges from the original Twilight plotline fairly early on, and diverges from it radically some time later, but there aren't really many wham points, just Bella's decisions building. Then Edward dies. Then we find out he isn't dead, and it manages to be another Wham, due to what's left of him. Just about whenever the Volturi show up, really.
Urusei Yatsura - The Senior Year during the "Tiger Saga" stories Sakura's Class Reunion, Arrive Reiko-chan, Tag Race Mark Three, The Return of Koosei Ryooki and especially Spirit-War Tomobiki. It was during this run of the stories that many of the changes which changed everything for the characters (both the canon and the fanfic-introduced characters), turning the series away from a standard fanfic into something quite different. It was in these stories that Ataru Moroboshi - in the wake of his being tortured by an enemy race of Lum's people - began to pull himself away from what he had come to see were potentially evil influences on his life. The last story listed here also revealled why he had always been made to act like a lecherous idiot.
Last Swordsman's Requiem, a side work sequel thing to Viandas. Chapter 5: Ok, so the hero has a broken as hell power. So do the villains, and they are better at using it than Thomas. Oh, and Thomas is this close to a Face-Heel Turn because of his Superpowered Evil Side
New Dawn: Chapter 8: The principal is Aleister Crowley, the Student Council President's not in control of his own organization, and Type V Anti-Hero Dex Anthem is loose. The next chapter ups it with the reveal of Nebiros, a magic using Serial Killer forcing a cartel to work for him in order to complete his agenda.
One upped by Chapters 9 and 10: Kyrio might not be dead, and Matthew has no sister. Someone's been fooling around in Matthew's head. Nebiros kills again, and Matthew is introduced to Sorata's organization, which shows him that Nebiros is working with Wayne Reverie, who is the actual mastermind of the School Board.
Chapter 11 and 12 are even moreso, with a huge gang war erupting which will have consequences over the course of the next three books, Shira kills a bunch of police, Matthew gains Aura Rave and fries Shira, and Shuuji is revealed to be both a clone and a spy and he never knew it. Oh, and he is dying.
Chapter 13 sees Matthew Realize he has a Superpowered Evil Side, which obliterates the Heavenly Blades in an utterly brutal Curb-Stomp Battle. Shuuji brings Matthew back to sanity, but dies moments later to the Artificial Angel monster the Blades had brought with them. Matthew defeats it, and it is revealed to be the Real Shuuji.
Chapter 14 deals with A massive prison break, Nebiros deciding to go to Sacramento and kill the remaining people on his vendetta list, and recruiting six people to be his vanguard, with whom he kills a whole SWAT team and sends a message to Matthew through the Team's blood.
Chapter 15: J-Antonio is revealed, and he has a Vesper Core. He then revives several of Matthew's old foes as strange cybernetic creatures that become important later, and then its revealed he can pull a Grand Theft Me, which he uses on the cartel owner's ten year old son.