->''"When a strange alien symbiote turns Franchise/SpiderMan's suit black, his darkest demons come to light - changing Spider-Man inside as well as out."''
-->-- ''Film/SpiderMan3'' DVD back cover

This is for when a character who is normally neutral, good, or just normally non-villainous, temporarily switches sides and/or has a noticeable temporary drop in morality. May be caused and justified by a character being NotHimself. Otherwise NegativeContinuity will likely play a huge role. The latter is especially true in nonsensical and farcical comedies where consistency is not a strong element. The character will go back to being his or her old self by either the end of the episode or the next episode.

Compare FaceHeelTurn & HeelFaceTurn, when a character either turns evil or good permanently or for a few episodes or seasons.

Contrast with JumpingOffTheSlipperySlope and/or MoralEventHorizon, which are more permanent and generally take place in a series with a standard level of continuity (though the MoralEventHorizon can take place in a NegativeContinuity show and overlap with this in some special cases). See also CompressedVice for problems other than villainy (though they may be the cause for it) that last an episode.



!! Examples:


[[folder:Anime and Manga]]
* In the Black Rose duelist arc of ''Anime/RevolutionaryGirlUtena'', some of the people Utena has to fight are her brainwashed friends.

* During the late nineties, Comicbook/IronMan went insane and became a villain, only to be replaced briefly by a younger version of himself from a different time. He also TookALevelInJerkass and acted like a villain in the Franchise/MarvelUniverse for about a year after ''Comicbook/CivilWar''.
** [[spoiler: The Civil War thing was solved by a HeroicSacrifice, that knocked his mind back to a 'him' made before the Civil War.]]
** [[spoiler: After the events of {{Comicbook/Axis}}, Tony has been reverted, yet again, to his former {{Jerkass}} ways.]]
** [[spoiler: And in All New, All Different Marvel he's back to being a good guy.]]

* While he doesn't quite become a full-blown villain so to speak, Spider-Man shows a semi-evil side in ''Film/SpiderMan3'' when the symbiote he has on his suit results in a major increase in vengefulness and aggressiveness. He doesn't switch sides; he's fighting against the same enemies as he was immediately before; but his "influenced" side has him doing things he severely regrets and that the series portrays as very clearly wrong.
* Franchise/IndianaJones temporarily becomes a [[ReligionOfEvil Thuggee cult member]] in ''Film/IndianaJonesAndTheTempleOfDoom'' and nearly sacrifices Short Round and Willie in the process, but he manages to snap out of Mola Ram's mind-warping in time.

[[folder:Live Action TV]]
* The EMH on ''Series/StarTrekVoyager'' was reprogrammed to perform unethical-at-best medicine by the Equinox crew.
* ''Series/BuffyTheVampireSlayer'' briefly toys with the dark side a few times. At the opening of season two (induced by trauma) and in a brief arc in season three.
** Done again in the ''Series/{{Angel}}'' episode "Sanctuary" where Buffy is the villain because she wants to kill Faith out of revenge.
** Willow at the end of season 6 when she becomes Dark Willow and eventually tries to [[WoobieDestroyerOfWorlds destroy the world]]. She gets better.
* ''Series/{{Charmed}}''
** In many episodes one of the Halliwell sisters will go to the dark side for a day before switching back by the end of the episode. A particularly notable one early on has all three sisters turn evil by the end of the episode, only for Leo to save them.
** Also, the episode where Paige does a spell to conjure up a 'Mr. Right' for 24 hrs which inadvertently also produces a 'Mr. Wrong' who she allows to seduce her with his seductive naughtiness.
* Duncan Macleod on ''{{Series/Highlander}}'' when he has the Dark Quickening.
* Clark on ''Series/{{Smallville}}'' when affected by Red Kryptonite.
* The [[Series/DoctorWho Time Lord Victorious]] from "The Waters of Mars." He comes to his senses ''very'' quickly, though.

[[folder:Professional Wrestling]]
* Wrestling/ShawnMichaels was basically always a face after his comeback in 2002, but he turned evil for about a month to beat up HulkHogan. Literally the night after the match he was back to being a good guy.
* Wrestling/StoneColdSteveAustin was always an AntiHero VillainProtagonist, since he was a face who did heel stuff, but in the [=InVasion=] angle he temporarily joined the invading WCW side, which was by definition the "bad" side of the angle. As soon as the angle was over he was back to his old self again.
** Actually, he was a villain even before the [=inVasion=], forming an alliance with [=Vince McMahon=] and Wrestling/TripleH. He just went along with the rest of WWE against WCW/ECW as part of an EnemyMine scenario, and (because he was WWE Champion), everyone in WWE assumed he'd stand with them.

[[folder:Video Games]]
* In the iOS game ''VideoGame/{{Highborn}}'', in Chapter 2, [[spoiler:Enzo becomes part of the Decay side for a while after marrying Jessica]].
* A slight subversion in VideoGame/ArtOfFighting, in which [[{{Bifauxnen}} King]] and [[SNKBoss Takuma]] were originally cast as villains who worked for series antagonist, [[BaldOfEvil Mr.]] [[TheDragon Big.]] The former was forcibly conscripted after being beaten by Jack and his gang, while the latter was blackmailed, by Mr. Big, who had [[IHaveYourWife kidnapped Takuma's daughter, Yuri.]]
** Shortly after the conclusion of the first game's events, King cut ties with Big and befriended the Sakazakis, while also becoming [[TheProtagonist Ryo's]] {{Love Interest|s}}. And Takuma returned to his family, where he resumed his position as head of the Kyokuugen Dojo.

* ''Webcomic/EerieCuties'': Chloe underwent a period of villainy when she donned the [[AmplifierArtifact Doom Panties]] prematurely. This caused her crush on [[spoiler: Layla's fiance, Dio]], along with her feelings of inadequacy, to draw out her SuperpoweredEvilSide. Thankfully, [[HeartwarmingMoments she got better]] and is back to [[http://www.eeriecuties.com/strips-ec/been_there_all_night her lovable self.]] ...And promptly shipped off to a spin-off series.

[[folder:Web Originals]]
* All four main characters in ''{{WebAnimation/Eddsworld}}'' are this for at least one episode. Edd in ''Tord's Adventure,'' Tom in ''Zanta Claus III,'' Matt in most of the ''Zombeh Attack'' trilogy and ''Matt Sucks,'' and Tord is revealed to be the villain of [[spoiler: ''The End'']].
* Agent Washington from ''Machinima/RedVsBlue'' is temporarily half of a BigBadDuumvirate during the latter part of ''Machinima/RedVsBlueTheRecollection'', but at the end returns to the heroes' side and stays there for the rest of the show.

[[folder:Western Animation]]
* ''WesternAnimation/EdEddNEddy''
** Jimmy was an antagonist in the episode "If It Smells Like An Ed", when [[spoiler: he turned out to be the one who got the Eds in trouble, as retaliation for Eddy giving him an atomic wedgie.]]
** Ed himself is this in "Little Ed Blue" (where he was violently ill-tempered all day [[spoiler: because of [[RampageFromANail a pebble stuck in his shoe]]]]) and "The Day the Ed Stood Still" (when he dressed up as a space monster and [[LostInCharacter got a little too into character]]).
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' uses this every now and then, typically with mild examples.
** Spike the dragon is normally good, but becomes envious in [[Recap/MyLittlePonyFriendshipIsMagicS1E24OwlsWellThatEndsWell Owl's Well That Ends Well]] at the attention Owlowicious is getting. This drives him to do some very morally objectionable things complete with a DastardlyWhiplash get-up, such as planting a fake mouse corpse to try to make it look like Owlowicious killed the mouse. [[note]]When called out on this, he runs away from home, tries to hide in a cave that happens to belong to another dragon... a dragon who seems like he's about to kill or at least severely hurt Spike... but Spike ends up getting saved, [[CrowningMomentOfHeartwarming by Owlowicious. And then Twilight Sparkle reassures Spike he still has an important place in their social circle, prompting Spike to apologize for what he's done]]. By the end of the episode, Spike is pretty much one of the good guys again.[[/note]]
*** A more threatening temporary villainy occurs during [[Recap/MyLittlePonyFriendshipIsMagicS2E10SecretOfMyExcess Secret Of My Excess]], when his greedy dragon nature gets out of control. When [[spoiler:Rarity, not knowing he is the same Spike, talks about how generous Spike was]], he feels ashamed of what he has become and immediately reverts back to his old self.
** Twilight Sparkle has this in "[[Recap/MyLittlePonyFriendshipIsMagicS2E3LessonZero Lesson Zero]]", when Twilight is driven insane in her rush to find a friendship problem, to the point where she deviously creates one herself. Her AppleOfDiscord plan, however, [[GoneHorriblyRight goes horribly right]].
** Babs Seed in "[[Recap/MyLittlePonyFriendshipIsMagicS3E4OneBadApple One Bad Apple]]" joins Diamond Tiara and Silver Spoon in their bullying of the Cutie Mark Crusaders. Babs then sees the error of her ways and when the bullies confront the CMC again, she stands up to them and threatens to [[DontTellMama tell their mothers about their behavior]].
** Trixie goes from a JerkAss and arrogant but ''hardly'' evil stage performer to a rather sadistic villain who takes over Ponyville in "[[Recap/MyLittlePonyFriendshipIsMagicS3E5MagicDuel Magic Duel]]" thanks to the influence of the [[ArtifactOfDoom Alicorn Amulet]].
** Rarity becomes this in "[[Recap/MyLittlePonyFriendshipIsMagicS4E23InspirationManifestation Inspiration Manifestation]]" after learning a spell that allows her to alter anything [[ImaginationBasedSuperpower with her imagination]], wanting to make Equestria a more beautiful place. By which she means transforming everything into a golden, gem-encrusted, or otherwise impractically gaudy version of itself.
** In "[[Recap/MyLittlePonyFriendshipIsMagicS5E5TanksForTheMemories Tanks for the Memories]]", Rainbow Dash decides to stop winter from happening just so her tortoise Tank didn't have to hibernate, going as far as sneaking into the weather factory in Cloudsdale to stop any kind of snowfall.
* ''WesternAnimation/ThePowerpuffGirls''
** Buttercup was an antagonist in "Moral Decay", using teeth beaten out of villain for cash, then resorting to doing so those who had yet to do anything evil, which is one of her biggest JerkassBall moments.
** Blossom's golf club-stealing incident in "A Very Special Blossom."
** The Mayor becomes one in "Hot Air Buffon" when he tries to fight crime without the girls by using a hot air balloon with a boxing glove, but he ends up injuring innocent people, so the girls have to stop him.
** Bubbles twice: "Bubblevicious" where she becomes too aggressive and "Los Dos Mojos" where she loses her memory and terrorizes Townsville under the belief she's Mojo Jojo.
* In ''WesternAnimation/RoswellConspiracies'', this happens to Sh'lainn twice;
** Once when she suffers from an affliction called "the iron death", which causes a banshee to go insane and [[OneWingedAngel merge with all the machinery around her]] after staying away from nature for too long.
** In another episode she's nicked by a vampire, who uses her blood to turn them both into vampire/banshee hybrids [[spoiler: she resists when she's asked to drain Nick dry, giving The Alliance time to turn up, knock them out and reverse the process.]]
* ''WesternAnimation/SpongebobSquarepants''
** Barnacle Boy switching sides over not getting enough food and respect.
** Mrs. Puff has one in "Demolition Doofus" which gets her dangerously close to crossing the MoralEventHorizon.
** Just about almost every main character have their moments of temporary villainy. [[LethallyStupid Patrick Star]], [[EvilisPetty Mr. Krabs]](whose case is less a few moments and more like 50% of the time), and [[AntiHero Squidward Tentacles]] in particular.
* ''WesternAnimation/TheFairlyOddParents'': Jorgen Von Strangle in the episode "Action Packed!". While he's normally merely a JerkAss (albeit with a HiddenHeartOfGold), Timmy's wish that his life was an action movie turns Jorgen into an action movie villain, who kidnaps fairies and uses a machine to suck the magic energy out of them and transfer it to himself, making him even more powerful and gigantically muscle-bound. Luckily, he's returned to normal when the wish is unwished.
* WesternAnimation/{{Rocko|sModernLife}} in "Power Trip" after ignoring Mr. Smitty who told him, "Don't push the green button!"
* Principal Skinner is turned into an antagonist in a few of the musical episodes of ''WesternAnimation/TheSimpsons'' such as "The President Wore Pearls" and "Yokel Chords", even explicitly having an "evil plan" in the former. Superintendent Chalmers as well, although he's ordinarily a {{Jerkass}} anyway.
* In ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'' most main characters have their own episodes as antagonistic threats, usually when they get the motivation to screw the rest of the cast over. A special mention goes to Irwin who in most episodes despite being obviously slimy and self-serving is merely the victim of some magical mishap but whenever he gets any sort of power it always gets to his stupid head and uses to take advantage and subjugate the other characters even his supposed friends.