History FaceHeelTurn / WesternAnimation

** Riven in Season 1; he grows frustrated with the Winx and his fellow Specialists, and eventually abandons his group, starts dating Darcy, and feeds the Trix information about Bloom. In the 4Kids Dub, he's brainwashed. He went evil again in ''The Secret of the Lost Kingdom'', but that was due to MindControl.
** Bloom twice in Season 2 serves Lord Darkar, but that was because of MindControl.
** Roxy in Season 4 when Nebula posesses her through the White Circle.
** [[spoiler:Aisha in Season 4. She join in the Nebula's group to kill the Wizard of the Black Circle and avenge Nabu's death]]. It didn't last long, though it was still pretty shocking.
** Tecna in Season 5 when Darcy curses her phone, turning her into a robot. Also Musa when she is turned into a mutant by Tritannus.
** Stella in Season 6 when she is BrainwashedAndCrazy by a MagicMirror conjured by Selena.

* A {{Flashback}} episode of ''WesternAnimation/ChallengeOfTheGoBots'' revealed that Cy-Kill was once Leader-1's best friend, but frustration over the leadership of Gobotron caused Cy-Kill to join the rebellion (and eventually lead it). In fact, the name of the episode where this is told is "[[Theatre/JuliusCaesar Et Tu, Cy-Kill?]]"

* WesternAnimation/DangerMouse suffers from amnesia after a blow to the head in "Public Enemy No. 1." His nemesis, Baron Greenback, convinces him that he's the Robin Hood-like White Shadow. This ends DM on a crime spree for which Colonel K charges Penfold with his arrest.

* The Franchise/DisneyAnimatedCanon

** Denahi in ''WesternAnimation/BrotherBear'', after he thinks a bear killed his brother Kenai (in reality, his brother Kenai was ''[[KarmicTransformation turned]]'' [[BalefulPolymorph into a bear]]). He spends most of the film on a RoaringRampageOfRevenge trying to kill Bear!Kenai until the very end where Kenai is transformed back right before his eyes.

* In ''WesternAnimation/KimPossible'', [[TheDragon Shego]] used to be a superhero before becoming a villain. Various other characters have short heel turns, often for a single episode, including Ron at least twice. This is
mostly due to the Attitudinator, a HeelFaceTurn[=/=]Face Heel Turn [[AppliedPhlebotinum in a helmet]]. One episode with it caused a HeelFaceRevolvingDoor for everyone but Kim herself.

* [[spoiler:Aqualad/Kaldur'ahm]] in Season 2 of ''WesternAnimation/YoungJustice'', after he becomes embittered at his former friends for [[spoiler:letting Tula die during a mission gone wrong]] and his own mentor, [[spoiler:Aquaman, for hiding the truth about his real, supervillain father, Black Manta. Kaldur ends up joining him.]]
** [[spoiler:Turns out he only faked his turn and is deep undercover for the Team.]]

* Julia, a RecurringCharacter from the ''WesternAnimation/PinkyAndTheBrain'' segments of ''WesternAnimation/Animaniacs2020'', is an example of a VillainProtagonist undergoing CreateYourOwnVillain. She starts as an ordinary mouse whom Brain makes [[UpliftedAnimal as intelligent as himself]] to be his first lady during a Senatorial bid, but she's such a NiceGirl that the voters choose her instead! Between Brain's [[GreenEyedMonster jealousy]] of Julia's success and her objections to his WellIntentionedExtremist methods, he decides to use a MindControlDevice to make her obey him, but it malfunctions and drives her insane. By her second appearance, she's become Brain's vengeful ArchNemesis who believes that she deserves to TakeOverTheWorld instead of him.

* Julia, a RecurringCharacter from the ''WesternAnimation/PinkyAndTheBrain'' segments of ''WesternAnimation/Animaniacs2020'', is an example of a VillainProtagonist undergoing CreateYourOwnVillain. She starts as an ordinary mouse whom Brain makes [[UpliftedAnimal as intelligent as himself]] to be his first lady during a Senatorial bid, but she's such a NiceGirl that the voters choose her instead! Between Brain's [[GreenEyedMonster jealousy]] of Julia's success and her objections to his WellIntentionedExtremist methods, he decides to use a MindControlDevice to make her obedient to him, but it malfunctions and drives her insane. By her second appearance, she's become Brain's vengeful ArchNemesis who believes that she deserves to TakeOverTheWorld instead of him.

* In ''WesternAnimation/KimPossible'', [[TheDragon Shego]] used to be a superhero before becoming a villain. Various other characters have short heel turns, often for a single episode, including Ron at least twice.
** Most due to the Attitudinator, a HeelFaceTurn[=/=]Face Heel Turn [[AppliedPhlebotinum in a helmet]]. One episode with it caused a HeelFaceRevolvingDoor for everyone but Kim Possible.

** The Season 7 finale villain, Stygian, was once the Jimmy Olsen to Starswirl the Bearded's Superman. It was over a thousand years ago that he desired to become a hero like Starswirl and the other Pillars of Equestria, so he borrowed their artifacts of power without asking, intent on creating copies. Unfortunately, the Pillars decided that the theft alone was proof that Stygian was evil, and harshly rejected him. He then made his way to the Well of Shade, embracing the dark powers within and becoming the Pony of Shadows.

* Quacky the Duck on ''WesternAnimation/TUFFPuppy''. He used to be a happy, funny TV show host until his show got cancelled by the network president, forcing him to turn evil and get revenge by destroying all television.

* ''WesternAnimation/{{Dragamonz}}' ' sees Boaragon forcibly undergo one of these after he is captured and brought before [[BigBad Grimserver]] who has him transformed into a Grimwrath.

* In the ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' episode ''[[Recap/MyLittlePonyFriendshipIsMagicS4E25TwilightsKingdomPart1 Twilights Kingdom Part 1]]'', Discord is swayed into helping Tirek in exchange for true freedom.

** The Season 7 finale villain, Stygian, was once the Jimmy Olsen to Starswirl the Bearded's Superman. It was over a thousand years ago that he desired to become a hero like Starswirl and the other Pillars of Equestria, so he borrowed their artifacts of power without asking, intent on creating copies. Unfortunately, the Pillars decided that the theft alone was proof that Stygian was evil, and harshly rejected him. He then made his way to the Well of Shade, embracing the dark powers within and becoming The Pony of Shadows.

* ''WesternAnimation/{{Dragamonz}}' ' sees Boaragon forcibly undergo one of these after he is captured and brought before [[BigBad/Grimserver]] who has him transformed into a Grimwrath.

* Creator/HannaBarbera's Muttley CaptainErsatz as well as Series/{{Columbo}} {{Expy}} Mumbly was made a bad guy in ''WesternAnimation/LaffALympics'' and ''Yogi Bear and the Magical Flight of the Spruce Goose'' because they didn't have all the rights to ''WesternAnimation/WackyRaces'' at the time and couldn't be bothered to create a new character.

** Zuko does a beautiful FaceHeelTurn in the season 2 finale. Actually, he does a FaceHeelTurn, then a HeelFaceTurn, then another FaceHeelTurn, then a few somersaults, ending with another HeelFaceTurn. Say that three times fast. His first FaceHeelTurn came when he was 12. An innocent, well-meaning boy gets half his face burned off by his ''loving'' father. After this, he hunts Aang ruthlessly for his "honor." His second, and most exemplary FaceHeelTurn, came at the second season finale. After starting fresh in Ba Sing Se, Zuko has to choose between his honor and his Uncle. After a blatant "I Hate You" speech, he attacks Aang and returns home a hero, at least until his final HeelFaceTurn.

** The season 7 finale villain, Stygian, was once the Jimmy Olsen to Starswirl the Bearded's Superman. It was over a thousand years ago that he desired to become a hero like Starswirl and the other Pillars of Equestria, so he borrowed their artifacts of power without asking, intent on creating copies. Unfortunately, the Pillars decided that the theft alone was proof that Stygian was evil, and harshly rejected him. He then made his way to the Well of Shade, embracing the dark powers within and becoming The Pony of Shadows.

* In the third season of ''WesternAnimation/OKKOLetsBeHeroes'', it's revealed that the once-heroic [[spoiler:Laserblast, a senior member of the hero-team P.O.I.N.T.]], went through this in the past and became a villain.[[spoiler:..the villain currently known as Professor Venomous.]]

*** This was loosely based on issue #24 of the Gold Key ''Scooby'' comic story "Mark of the Blue Scarab." The perp in this case was [[spoiler: a comic book scripter who thought he was a better writer than Sloane was an artist, so he goes about terrorizing Sloane.]] Both the comic and the animated episode were written by Mark Evanier.

** Princess Entrapta eventually joins forces with the Horde in season 1. Not out of malice or hatred; even though her friends left her behind in the Fright Zone, she bears them no ill will. No, she turns because her only motivation is ForScience and the Horde give her a lot more options for experimentation. The fact that her experiments are hurting people never seems to bother her, if she even realizes that's a thing.

*** A couple episodes later in "Gorilla Warfare", Optimus was infected by one of Scorponok's viruses, turning him into a nigh-unstoppable beserker that attacked Maximals and Predacons indiscriminantly.
*** The episode "Dark Designs" saw Megatron kidnapping and brainwashing Rhinox- however, Evil!Rhinox was a bit too good at being a bad guy, and nearly usurped Megatron's control of the Predacons. So he changed Rhinox back, and the Maximal was able to escape.

*** Tigatron and Airazor, technically speaking- when they were merged by the alien Vok into Tigerhawk, their sparks were not originally in charge of the resultant body. But it was still thier body, and the Vok used it to attack both Maximals and Predacons, so...

*** Transformers Prime also has the ''Orion Pax'' arc- after using the Matrix to defeat Unicron, Optimus loses some of his memories and reverts to being the archivist known as Orion Pax. Unfortunately, his old friend Megatronus was right there, and convinced him that the Autobots were villains responsible for both the war and Cybertron's destruction. Thankfully, Orion eventually uncovers the ruse.

** Riven in season 1; he grows frustrated with the Winx and his fellow Specialists, and eventually abandons his group, starts dating Darcy, and feeds the Trix information about Bloom. In the 4Kids Dub, he's brainwashed. He went evil again in ''The Secret of the Lost Kingdom'', but that was due to MindControl.
** Bloom twice in season 2 serves Lord Darkar, but that was because of MindControl.

** [[spoiler:Aisha in season four. She join in the Nebula's group to kill the Wizard of the Black Circle and avenge Nabu's death]]. It didn't last long, though it was still pretty shocking.

* Raimundo in the season one finale of ''WesternAnimation/XiaolinShowdown''. Shortly into season two, he [[HeelFaceTurn reverses it]] and returns to his friends, but not without suffering some consequences and trust issues. Later on, he does it ''again''... but as a BatmanGambit to help the heroes, using his prior earnest heel turn to sell the deception.

* [[spoiler:Aqualad/Kaldur'ahm]] in season two of ''WesternAnimation/YoungJustice'', after he becomes embittered at his former friends for [[spoiler:letting Tula die during a mission gone wrong]] and his own mentor, [[spoiler:Aquaman, for hiding the truth about his real, supervillain father, Black Manta. Kaldur ends up joining him.]]

* Zuko from ''WesternAnimation/AvatarTheLastAirbender'' does a beautiful FaceHeelTurn in the season 2 finale. Actually, he does a FaceHeelTurn, then a HeelFaceTurn, then another FaceHeelTurn, then a few somersaults, ending with another HeelFaceTurn. Say that three times fast. His first FaceHeelTurn came when he was 12. An innocent, well-meaning boy gets half his face burned off by his ''loving'' father. After this, he hunts Aang ruthlessly for his "honor." His second, and most exemplary FaceHeelTurn, came at the second season finale. After starting fresh in Ba Sing Se, Zuko has to choose between his honor and his Uncle. After a blatant "I Hate You" speech, he attacks Aang and returns home a hero, at least until his final HeelFaceTurn.
** The series' sequel, ''WesternAnimation/TheLegendOfKorra'' gives us Tarrlok, a [[SmugSnake Smug Weasel-Snake]] who, at least, appeared to be willing to ShootTheDog and [[IDidWhatIHadToDo doing what he had to do]] to keep Republic City safe from the Equalists and BigBad Amon. In "When Extremes Meet," though, he [[TookALevelInJerkass takes a massive level in Jerkass]], arresting most of the new Team Avatar and a lot of innocent non-benders. When Korra confronts him about it, Tarrlok tries to tell Korra she's NotSoDifferent than him, but she rebuffs him, including rejecting Tarrlok's request to free Team Avatar if she works with him. Then Tarrlok [[PeoplePuppets bloodbends Korra]] and kidnaps her, telling her she'll never see Republic City again. [[spoiler:Not long after that, [[BigBad Amon]] kidnaps Tarrlok (inadvertently letting Korra escape). When Korra runs into the imprisoned Tarrlok in the SeasonFinale, he's [[TheAtoner genuinely regretful about what he did]], and in the end he [[MurderSuicide kills both]] [[RedemptionEqualsDeath himself and Amon]].]]
*** The previous episode also featured a FaceHeelTurn for Hiroshi Sato, Asami's father, who joined up with the Equalists because [[LoveMakesYouEvil a firebender killed his wife]].

* A {{Flashback}} episode of ''[[WesternAnimation/ChallengeOfTheGoBots GoBots]]'' revealed that Cy-Kill was once Leader-1's best friend, but frustration over the leadership of Gobotron caused Cy-Kill to join the rebellion (and eventually lead it). In fact, the name of the episode where this is told is "[[Theatre/JuliusCaesar Et Tu, Cy-Kill?]]"

%%* Tai Lung of ''WesternAnimation/KungFuPanda''.

* In the second ''[[WesternAnimation/TeenageMutantNinjaTurtles2003 TMNT]]'' series, the real Oroku Saki was originally one of a group of warriors that defeated a powerful demon. However Saki [[WithGreatPowerComesGreatInsanity absorbed the power]] and became the Tengu Shredder.

* Dinobot in the ''Franchise/{{Transformers}}: WesternAnimation/BeastWars'' episode "Maximal No More." He does a HeelFaceTurn back at the end, though, upon realizing that just because everything's going according to Megatron's plans doesn't mean that Megatron isn't a dangerous madman.

* Quacky the Duck on ''WesternAnimation/TUFFPuppy''. He used to be a happy, funny TV show host until his show got cancelled by the network president, forcing him to turn evil and get revenge by destroying all television.
* An in Universe example seemingly appears in the first episode of ''WesternAnimation/ScoobyDooAndScrappyDoo''. The Blue Scarab, a comic book super hero, appears to have come to life and is going on a crime spree (Much to the entire gang's confusion and [[BrokenPedestal Scrappy's dismay]].) Of course, as per usual [[Franchise/ScoobyDoo Scooby]] fare, it was just a guy in a suit, but until the end the trope was played entirely straight.
** [[spoiler: The [[ScoobyDooHoax guy in a suit]] may still qualify. Howard Gruger worked for Jerry Sloan, the creator of the Blue Scarab comics as his assistant, but became tired of being an unknown assistant and wanted to create his own comic book character, so he disguised himself as the Blue Scarab and committed crimes so as to destroy the Scarab and Sloan. Of course, Gruger could have just asked Sloan if he could leave so he could create his own comic book character instead of trying to destroy Sloan and the Blue Scarab, but [[GreenEyedMonster he might also have been jealous of Sloan's fame.]].]]
*** This was loosely based on issue #24 of the Gold Key ''Scooby'' comic story "Mark of the Blue Scarab." The perp in this case was [[spoiler: a comic book scripter who thought he was a better writer than Sloane was an artist, so he goes about terrorizing Sloane.]] Both the comic and the animated episode were written by Mark Evanier.
* In ''WesternAnimation/SkylandersAcademy'', [[spoiler:[[TheHero Spyro]] is forced to undergo one after having all the light drained from him so Strykore could be freed from his prison, complete with blacker scales, a new voice, and [[ArsonMurderAndJaywalking the uncontrollable urge to take up two parking spaces instead of one]].]]
* In ''WesternAnimation/VoltronLegendaryDefender'', Zarkon and Honerva went from being heroes to villains due to them being exposed to Quintessence, which initially resulted in their deaths before being brought back to life and ultimately becoming the initial BigBad Emperor Zarkon and DragonInChief Witch Haggar respectively as a result.
* In ''WesternAnimation/TangledTheSeries'', [[spoiler: two different characters betray Rapunzel. The first is Varian after Rapunzel fails to keep her promise to help his father who is encased in a magical amber. The second is Cassandra, who after learning of her true heritage, being Mother Gothel's daughter, steals the Moonstone out from under Rapunzel's nose, takes its power, and abandons the party.]]
* In ''WesternAnimation/WordGirl'' it is sometimes mentioned that Doctor Two-Brains used to work with [=WordGirl=] on the side of good.

* Jojo does this in a rather epic fashion in ''WesternAnimation/ThePowerpuffGirls'' movie: "[[LargeHam The hobo fo'mo'ly known as Jojo is no mo'! From this day fo-woed, I shall be known as... MOJO Jojo!]]" Then again, he was EvilAllAlong, so this might not count.

* In ''WesternAnimation/WordGirl'' it is sometimes mentioned that Doctor Two-Brains used to work with Word-Girl on the side of good.

* In ''WesternAnimation/WordGirl'' it is sometimes mentioned that Doctor Two-Brains used to work with WordGirl on the dide of good.

* In ''WesternAnimation/TangledTheSeries'', [[spoiler: two different characters betray Rapunzel. The first is Varian after Rapunzel fails to keep her promise to help his father who is encased in a magical amber. The second is Cassandra, who after learning of her true heritage, being Mother Gothel's daughter, steals the Moonstone out from under Rapunzel's nose, takes its power, amd abandons the party.]]

* ''WesternAnimation/CodenameKidsNextDoor'' had an agent, Numbuh 274, who had appeared in a couple Season 1 and Season 2 episodes become a villain from Season 3 onward after turning 13. However, it turned out that [[spoiler:he'd been working for [[ReverseMole the good side all along]]]] in the penultimate episode of the show.

* A {{Flashback}} episode of ''[[WesternAnimation/ChallengeOfTheGoBots GoBots]]'' revealed that Cy-Kill was once Leader-1's best friend, but frustration over the leadership of Gobotron caused Xy-Kill to join the rebellion (and eventually lead it). In fact, the name of the episode where this is told is "[[Theatre/JuliusCaesar Et Tu, Cy-Kill?]]"

* ''WesternAnimation/StarWarsTheCloneWars'': [[spoiler: Senate Commando Captain Argyus (in Season 1), Clone Sergeant Slick (in Season 1 as well), Pong Krell (in Season 4), Barriss Offee (Started out as a heroine in Season 2, becomes a baddie in Season 5).]]

* WesternAnimation/DangerMouse suffers from amnesia after a blow to the head in "Public Enemy No. 1." His nemesis, Baron Greenback, convinces him that he's the Rob Hood-like White Shadow. This ends DM on a crime spree for which Colonel K charges Penfold with his arrest.
-->'''Penfold:''' Arrest him? But...how can I? I was never issued with an initiative. And I wouldn't know how to load it!

* Raimundo in the season one finale of ''WesternAnimation/XiaolinShowdown''. Shortly into season two, he [[HeelFaceTurn reverses it]] and returns to his friends, but not without suffering some consequences and trust issues.

** In ''Disney/TheAristocats'', we get to see Edgar turn into a villain the minute he realizes he can get all of his madam's wealth if he gets rid of her cats.
** Perhaps one of the more tragic examples is Copper from ''Disney/TheFoxAndTheHound'' turning into a full-on hunting dog, [[AntiVillain while still being a nice person at heart]] and [[WeUsedToBeFriends not wanting to kill his former friend]] Tod the fox. So to say, Copper does not become evil, but he's permanently switched to the side of his spiteful old hunting master, which puts him opposite of Tod, left to fulfill the traditional protagonist role.
** Denahi in ''Disney/BrotherBear'', after he thinks a bear killed his brother Kenai (in reality, his brother Kenai was ''[[KarmicTransformation turned]]'' [[BalefulPolymorph into a bear]]). He spends most of the film on a RoaringRampageOfRevenge trying to kill Bear!Kenai until the very end where Kenai is transformed back right before his eyes.

* WesternAnimation/SheRaAndThePrincessesOfPower