* AlternateCharacterInterpretation:
** Walternate - MagnificentBastard with a touch of OmnicidalManiac for spice; or simply a man who saw a series of attacks on his ''universe'' - that have killed [[AMillionIsAStatistic thousands, if not millions]], starting with [[spoiler: the kidnapping of his son]], and may possibly culminate with a [[ApocalypseHow Class X-4 Apocalypse]] - and believes this to be the result of a deliberate attack by "our" side, and thus regards himself as fighting a war. John Noble sees it as [[TakeAThirdOption both.]]
** Played with in Season 3: Walter says he no longer sees Walternate as pure evil after facing the choice to seal a soft-spot with amber. Walternate, in turn, says he will never authorise experiments on children, a line Walter crossed a long time ago. In Season 4, with the alternate timeline, Walternate is no longer a bad guy, but remains mistrusted by "our" side.
** The Observer in "An Origin Story". [[NotSoStoic Was he really displaying a fear response?]] Did he say what he did simply to screw with Peter's head? Or was he really devoid of any emotion?
** There is a mild one for [[BigBad Captain Windmark]]: Is he a BlueAndOrangeMorality KnightTemplar WellIntentionedExtremist who is trying to build the perfect world for his nation of Observers or TheSociopath, TheUnfettered who just ''loves'' to squash humans like bugs [[ForTheEvulz for the Hell of it]]? [[TakeAThirdOption Or both]]?
* AwardSnub: John Noble's lack of even a single Emmy ''nomination'' has left many fans howling.
* BaseBreaker:
** Charlie. [[spoiler: Many fans were left very unhappy when he was replaced by an imposter]].
** [[BodySurf Bellivia.]] Anna Torv's acting was either [[SoCoolItsAwesome brilliant]], [[CrowningMomentOfFunny hilarious]] or the [[{{Narm}} stupidest thing ever done.]] [[NarmCharm Sometimes, all three.]]
* BigLippedAlligatorMoment:
** [[http://www.youtube.com/watch?v=nQ0eYUMxIT4 Singing Corpses!]]
** [[http://www.youtube.com/watch?v=1Dev-cWIy8A "Black Umbrella."]]
* CompleteMonster: Most villains have [[WellIntentionedExtremist sympathetic motivations]] to their actions, with most having redeeming qualities. Nevertheless, with its initial MonsterOfTheWeek format, there have been exceptions.
** Richard Steig from the [[Recap/FringeS01E01Pilot Pilot]] is an employee of [[MegaCorp Massive Dynamic]] who was asked to steal research into airborne viral contagions - research that had been conducted by the scientists Walter Bishop and William Bell decades earlier. Stieg was able to manufacture a flesh-melting contagion that causes the infected individual's [[BodyHorror skin to decompose in a matter of seconds]]. The contagion was then smuggled onto Flight 627 in his twin brother Morgan Steig's insulin pen. He chose Morgan to show his "commitment" for potential buyers for the toxin. Everyone on the plane died when the toxin made them crystalize.
** David Esterbrook from season 1's "[[Recap/FringeS01E06TheCure The Cure]]" was the [[CorruptCorporateExecutive head]] of the pharmaceutical research division of the company [=INtREPUS=]. Esterbrook, to make money, created a program that would forcibly abduct and turn young women who suffered from a rare disease into unknowing radiation suicide bombers. He tested this on a cafe full of innocent people, causing their brains to boil and burst. After the first test, Esterbrook simply opted to repeat the process, showing no remorse or hesitation when confronted by special agent Olivia Dunham.
** The [[OlderThanTheyLook artificially youthful]] [[ThoseWackyNazis Nazi]] MadScientist Alfred Hoffman from season 2's "[[Recap/FringeS02E14TheBishopRevival The Bishop Revival]]" was an unrepentant {{Sociopath}} who survived the war and went into hiding. Decades later, Hoffman resurfaces with his greatest creation: a toxin he engineers to target specific genetic strains. He first tests it on a Holocaust survivor and her family at a wedding. He later tests it on a cafe to confirm its effectiveness and the fact he can use it to kill anyone not part of his "MasterRace." Before Walter Bishop [[HoistByHisOwnPetard turns the toxin on Hoffman himself,]] Hoffman is about to deliver it at a human rights conference to kill everyone there.
* CrazyAwesome:
** Walter. This man cured a virus that wiped out the mammoths with ''horseradish''.
** William Bell. Planned his little BodySurf ''months'' in advance.
** Peter has his moments. He used the amount of adrenalin in a woman's brain to calculate where she had been killed.
* CrowningMusicOfAwesome:
** Fauxlivia's theme. "Newton's Last Mission" on the soundtrack.
** Peter and Olivia's theme. "Love In the Time Of Crossing Over."
** "The Equation."
** "Devastation Nation."
** "Doppleganger Up On Reality." [[spoiler: It's the music playing when blue!Peter dies.]]
* DieForOurShip:
** [[spoiler: Alternate!Olivia]] is not exactly well liked by the Peter/Olivia shippers.
** Rachel got a little hate for flirting with Peter.
* DracoInLeatherPants: Thomas Jerome Newton is arguably the most popular villain in the series. [[EvilBrit And]] [[BadAss why]] [[MagnificentBastard not]]?
** Despite being an absolute complete dick, a lot of fans have taken to Windmark.
* EnsembleDarkhorse: Charlie, Lincoln (in both universes), Gene the cow , Scarlie, William Bell, Brandon, Sam Weiss, Henry Higgins the cab driver, and Asteroid! Er... I mean Astrix! Oh wait no. Astro! That's it.
* EvilIsCool: When you have [[TheChessmaster David Robert]] [[WickedCultured Jones]], [[ManipulativeBastard Thomas]] [[EvilBrit Jerome Newton]], [[OmnicidalManiac Secretary]] [[TragicVillain Walternate]], [[spoiler: [[Creator/LeonardNimoy William]] [[MagnificentBastard Bell]]]] and [[SharpDressedMan Captain]] [[SoftSpokenSadist Windmark]], it almost seems like they were TRYING to invoke this.
** EvilIsSexy: Newton falls into this one as well.
* FanPreferredCouple: Most everyone would love to see Lincoln (alternate universe) and Fauxlivia together.
** [[spoiler:She ends up with Lincoln from the original universe.]]
* FunnyAneurysmMoment:
** Most of the humor in "Brown Betty" is negated when you look at Walter's story as an allegory for the entire series so far. Especially the part where [[TearJerker Walter says Peter took his heart when he left and Walter will die without it, and the storyteller seems to think this is the fate he deserves.]]
** At the beginning of ''"Concentrate and Ask Again"'', a guy comments that he never wants to hear his friends sing again after they sing "Happy Birthday" for him. Yeah... he doesn't last past the opening theme.
** "You're bald! [[StageWhisper I think he's an Observer.]]" Oh, Peter...
** A lot of people like to think Broyles' stint in "Lysergic Acid Diethylamide" was one big CrowningMomentOfFunny. That is, until he starts "seeing death" - starts seeing ''himself.'' Seeing his alternate self's mutilated corpse at the end of "Entrada" scared and scarred him more than he'd ever admit.
* GrowingTheBeard:
** After the episode "Peter", the series generally lost its monster of the week formula and the alternate universe angle became much more prominent. The show has been far better ever since.
** There's a lot of first season contenders for which episode Grew the Beard, all of them being episodes that introduced some element of the MythArc.
*** "The Arrival", which introduced the Observer.
*** "In Which We Meet Mr. Jones", which gave us the first BigBad of the series.
*** "Ability", which fleshed out ZFT and the concept of the War with the Other Side, and introduced Olivia's cortexiphan abilities.
*** "There's More Than One of Everything", which revealed that Walter abducted Peter, introduced William Bell and featured the series' first trip to the Alternate Universe.
*** "Momentum Deferred", in which the stakes of the series are very explicitly laid out for the first time.
* HarsherInHindsight:
** Walter's very first line. "I knew someone would come eventually." At the time, it's simply a crazy man thinking that someone would come for him someday. After watching the entire show, it's because he knows they'll need his help because [[spoiler: he broke the entire universe.]]
** Watching "Unleashed" (S1-E16) after "A New Day In The Old Town" (S2-E01): [[spoiler: the episode is about trying to save Agent Charlie Francis from being killed by the larvae of a hybrid monster inside him. It also shows his family. Then, in A New Day in The Old Town, the writers [[DroppedABridgeOnHim Dropped A Shapeshifting Assassin On Him.]]]]
** William Bell warning Olivia about how terrible and horrifying the Shapeshifters are becomes a little bit unsettling when we find out [[spoiler: Bell ''invented'' the damn things.]]
** [[WhatTheHellHero Walter locking up our Olivia in the dark]] in "Subject 13" is much more disturbing when you think about the light deprivation torture that was inflicted on her by [[WellIntentionedExtremist Walternate.]]
** "Everything In Its Right Place" was [[{{Foreshadowing}} full of these.]]
*** "You'd do the same if it was your partner."
*** "I've never seen her barf or shed a tear."
*** "That's the difference between you and me. My universe wouldn't survive without me."
** William Bell flirting with Astrid is suddenly not funny any more.
* HilariousInHindsight: In what may be an amusing bit of {{Foreshadowing}}, the episode "The Road Not Taken" has a ConspiracyTheorist claim he is [[Series/StarTrekTheOriginalSeries Spock]]. Later on, we find out who is playing [[Creator/LeonardNimoy William Bell]]...
* HoYay / LesYay
** Walter/Bell. Walter even has an affectionate nickname for "Belly." In 3.20, [[spoiler:Walter tells Bell that he needs him. Now imagine that whole conversation between a man and a woman who've known each other for a long time...]]
*** "We could have been so happy together." It's like they forgot to be subtle about it.
** Lincoln ([[spoiler:the one from the original universe]]) with both [[spoiler:Peter]] and [[spoiler:his late partner Robert Danzig]].
** Astrid and [[spoiler: William Bell-possessed Olivia]].
*** [[NoYay Astrid seems a little freaked out by this.]]
** PI Olivia and Esther Figglesworth.
** Some fans thought the vibe between Rachel and Olivia was [[RelationshipWritingFumble not at all "sisterly."]]
* {{HSQ}}: To the extreme at points. Season Five even more so.
* JerkassWoobie: Walternate. He's a ManipulativeBastard KnightTemplar who's willing to commit horrible crimes to preserve his universe (including destroying another universe), but after we learn his backstory and how he came to this point it's near impossible to not pity him at least a little. Walter used to count as this too, but his time in the mental asylum and [[spoiler: his lobotomy]] caused him to lose the Jerkass part.
* MagnificentBastard:
** Walternate, proven in ''Bloodline''.
** David Robert Jones. Plays ''both'' Fringe teams (including ''Walternate'') and ''wins'' half the time.
** Thomas Jerome Newton. "Now I know how weak you are."
** [[spoiler: William Bell, who successfully outplays ''David Robert Jones.'']]
-->'''Walter:''' You brilliant ''bastard'', [[spoiler: Belly.]]
* MemeticMutation: A new word has recently been coined, "Walterism."
---> "She tricked my son with her carnal manipulation and he fell right into her ''[[GettingCrapPastTheRadar vagenda!]]''"
---> (Watching SpongebobSquarepants with Gene and Astrid) "It's surprisingly profound... for a narrative about a sponge."
---> (smiles) "I just got an erection. Oh, fear not. It's nothing to do with your state of undress. I just simply need to urinate."
---> "Hello, Peter. This is me... your father... Walter Bishop."
--->"Don't be such a prude Peter, I'm sure Agent Dunham knows what a penis looks like!"
* {{Moe}}: ''Astrid''. Both of them, but ''especially'' red-universe Astrid -- who, hilariously, seems to provoke this reaction from her own blue-universe self.
* ParanoiaFuel: Frequently.
** There is a chemical that [[AndIMustScream causes your orifices to seal themselves shut]]. It's most commonly distributed on plain 'ol American paper currency. If some attempts to trach-tube you, your skin could simply grow ''over'' the trach. A [[http://en.wikipedia.org/wiki/United_States_two-dollar_bill two-dollar bill]] to be exact. Though Walter posits that they were just "showing off"; there's nothing to stop them from putting it on any given bill. Say, you got change for a twenty?
** Right now, people from another universe could be watching you. And you'd never know it.
** A shape-shifting assassin may have killed and replaced someone you know. Maybe a co-worker, maybe a friend, maybe a loved one. They look the same, act the same, and even have all the same memories. By the time you realize something's wrong, it's probably too late.
** "No Brainer" gives someone melting brains using the internet. Now if that's not high octane paranoia fuel to everyone reading this page, you must have a ''fantastic'' popup blocker.
** Mind reading, invaders from the future.
* TheScrappy: Sanford Harris
* SeasonalRot: Not as pronounced as in a lot of cases but for some people [[spoiler: the switch to an alternate timeline]] and the confusion as to whether we should see these characters [[spoiler: as the those we knew for the first three years or merely alternate versions]] caused problems and emotional distance from the storyline.
* SheReallyCanAct: Many viewers who were underwhelmed by Anna Torv's performance changed their minds at the end of Season 2, when they saw just how convincingly she could play [[ActingForTwo Olivia and Fauxlivia]] as two separate characters.
* ShipTease
** Rachel and Peter had a few moments of flirtation in Season 1. [[DieForOurShip There was disapproval.]]
** Nina and Broyles. [[spoiler: They kiss in Season 2.]] This is never brought up again.
** It was suggested that Nina had a thing for William Bell throughout the series. [[spoiler:Considering he tried to use her adopted daughter to destroy the two universes and made no attempt to save her life, the ship has probably sunk.]]
** [[OddFriendship Walter and Fauxlivia]] have their moments of [[CrackPairing not-to-be-taken-seriously-but-kinda-hilarious]] flirtation in season 4.
* ShockingSwerve:
** "Of Human Action" has some jarring twists:
*** The kid [[spoiler:turns out to be behind everything]].
*** The [[spoiler:anti-mind control headphones turn out to not work]].
*** Moreover [[spoiler:it turns out there are several Tylers]].
** ''"6:02 am EST"'' was full of these.
** The season three finale. [[RetGone Yeah.]]
* {{Squick}}:
** It's okay to squirm during scenes like [[spoiler:Flight 627, the shades-of-Alien pregnancy scene, or when people's skin start growing over their eyes... and ears... and mouth... and ''other]]'' places. Really.
** The mutant shapeshifter fetus thing.
*** [[HellIsThatNoise The tearing sound. Oh God the tearing sound!]]
** [[spoiler: William Bell wanting Peter and Olivia to be his "Adam and Eve".]] Does the term "genetic bottleneck" mean ''anything'' to you?
* TearJerker: [[{{TearJerker/Fringe}} Has it's own page.]]
* TooCoolToLive
** [[spoiler: Captain Lincoln Lee.]]
** [[spoiler: David Robert Jones.]] ''Twice.''
** [[spoiler: Thomas Jerome Newton.]]
** [[spoiler: September/Donald]]
* ToyShip: Young Peter and Young Olivia in "Subject 13".
* UncannyValley: The Observers. They're pale and hairless, speak in a CreepyMonotone and have an odd way of staring at people. They're more in the "off-putting" rather than "scary" part of the Valley.
* WhatAnIdiot:
** What would ''possess'' someone to create a wasp/snake/bat hybrid creature? In what ''universe'' is that a good idea?! Ours, apparently.
*** Darwin Awards are also in order for the [[GenreBlindness morons]] [[AnimalWrongsGroup who let it out.]]
** September, [[ShipperOnDeck we love you and everything]], [[NiceJobBreakingItHero but why the hell didn't you just tell Walternate the cure was working?]]
** Pretty much everyone for not noticing that Fauxlivia was acting odd. After a mission to an alternate universe. Where they know there is an alternate version of her. Also shapeshifters who can look like anyone. Not a single red flag.
*** Similarly, no one checking to make sure Charlie... was Charlie after he was replaced by a shapeshifter. When they knew they were fighting a shapeshifter. Seriously, guys...
** More a case of [[LoveMakesYouStupid Grief Makes You A Dumbass]], but there is not a chance that Peter [[spoiler: inserting Observer tech into his brain without knowing a thing about it]] is a good idea.
* TheWoobie:
** As much as Walter deserved to be locked away for his experiments in the past, one can't help but feel for him when he starts crying or suffers a HeroicBSOD as a result of his inability to deal with the skeletons in his closet.
** Peter:
*** He was definitely a Woobie when he was little. [[spoiler:Both of them were.]] He pulled off a combination of [[LittlestCancerPatient Littlest Some Kind Of Deadly Disease Patient]] and YouCantGoHomeAgain.
*** [[BreakTheHaughty Peter in season 4 and 5.]] [[spoiler:First, no one remembers that he existed. Then he loses his three year old daughter. Then she dies.]]
** A lot of the minor characters come to mind. Christopher Broyles and Joseph Meagar just to name a few.
** Rachel Dunham, Olivia's sister. Her husband is a ''[[JerkAss jackass]]''.
** [[IronWoobie Olivia]]. In Season 1, [[spoiler: her boyfriend dies (but not before she finds out he's a traitor), she gets kidnapped and discovers that she was experimented on a child. In Season 2, she crashes through a windshield, develops PTSD, falls in love with Peter, Peter leaves, she goes to rescue him from an AlternateUniverse, she gets left behind in said AlternateUniverse with no obvious way of escaping and Walternate tortures and experiments on her. In Season 3, she gets [[MindRape mind raped]] into thinking she's her alternate self, she remembers who she is, she gets captured ''again'', she gets rescued and comes home only to discover that Peter was doing her alternate. In Season 4, she can't remember the love of her life even existed, she's being drugged against her will so that she can be used to power some doomsday device, she remembers the love of her life but forgets her surrogate mother, and then she gets shot in the head. At some point between 4 and 5, her daughter goes missing, her world is invaded and she and Peter have a falling out. In Season 5, she spends 20 years in amber and then bonds with her long lost daughter, who is then unceremoniously killed off. She then finds her surrogate mother after Nina is forced to shoot herself in the head.]] Young Olivia was even more Woobie-ish. [[spoiler: After Walter frightens her into blowing up a room, she runs away. Not because she doesn't want to be experimented on any more... but because she thinks that she "messed up" and that Walter will send her away. That's right folks. She's so terrified of her stepfather that she'd rather be in an illegal drug trial.]] Seriously... [[http://primetimewithcaroline.files.wordpress.com/2011/02/fringes13110226060241.jpg?w=300&h=245 just look at her.]]
*** Olivia is definitely a StoicWoobie. [[BreakTheCutie Despite the long list of grievances she has]], it takes a lot to make her actually cry, and she refuses to do so if it means "burdening" the people around her.
** Alt-Astrid, [[spoiler: after her father dies.]]
** [[RomanticRunnerUp Lincoln.]]
** [[spoiler:Amber Timeline]] Nina Sharp, [[spoiler: considering her daughter can't remember her, her granddaughter died, she's in love with an OmnicidalManiac who screwed her over epicly, she spends 21 years without her family, in a wheelchair with a broken cybernetic arm and surrounded by mind reading invaders from another time, she thinks that the only thing she's good for is helping the Fringe team, and when it gets out she's part of the resistance she's forced to perform a HeroicSuicide to stop herself from betraying Olivia and the others.]] Her life sucked.
** If Fauxlivia wasn't upgraded to JerkassWoobie status at the end of Season 3, she definitely was when [[spoiler: Lincoln gets shot]].
** Etta [[spoiler:Bishop]] is another IronWoobie.
** September [[spoiler: AKA Donald. He's basically been alone for 21 years but not after being experimented on and banished by the other Observers.]]
*** And a case of fridge horror, [[spoiler: can you imagine what it must have felt like, for September to get up, and suddenly be hit with raves of emotions? And also to live must of his life as Observer and to suddenly have all that taken away?]]
** [[BlessedWithSuck The cortexiphan subjects.]] ''All of them.'' [[StoicWoobie Olivia]] got off lucky.
* WTFCastingAgency: Alright, casting department: you get BradDourif, an extraordinarily prolific character actor who's been in countless horror shows and movies and who, over fifteen years ago, gave a seminal performance in your show's spiritual predecessor ''Series/TheXFiles''. And then you....cast him as a generic {{Mook}} with no defining characteristics or interesting material to work with? What the hell, guys?