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* EldritchTransformation \\
A character is transformed into an Eldritch Abomination.
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* In ''Manga/OnePiece'', it's implied this happens to [[spoiler:Bartholomew Kuma as he turns more and more into a robot, to the point that he says that he will technically die soon since his free will shall be taken away from him by the World Government]]. Though only a handful of people are aware that [[spoiler:Kuma]] was ever ''not'' a monster.

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* In ''Manga/OnePiece'', it's implied this happens to [[spoiler:Bartholomew Kuma as he turns more and more into a robot, Pacifista, to the point that he says that he will technically die soon since his free will shall be taken away from him by the World Government]]. Though only a handful of people like [[spoiler:Dragon, Ivankov, and Sabo, his fellow former Revolutionaries; and Bonney his adoptive daughter and her crew (and his friends in Sorbet)]] are aware that [[spoiler:Kuma]] was ever ''not'' a monster.
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Basically this is when one of the good guys [[FaceHeelTurn becomes a villain]] not out of choice, but because they were transformed into one one way or another (this makes it a {{supertrope}} to several tropes as outlined below). This can also apply to non-sapient entities, such as computers that [[AIIsACrapshoot go nuts]], {{mon}}s that are TurnedAgainstTheirMasters because someone else is giving them orders, and so on. As long as it was happy with its allegiance and something other than its own whims changed it, it fits.

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Basically this is when one of the good guys [[FaceHeelTurn becomes a villain]] not out of choice, but because they were transformed into one one way or another (this makes it a {{supertrope}} to several tropes as outlined below). This can also apply to non-sapient entities, such as computers that [[AIIsACrapshoot go nuts]], {{mon}}s that are TurnedAgainstTheirMasters because someone else is giving them orders, and so on. As long as it was happy with its allegiance and something other than its own whims changed it, it fits.
fits. Subtrope of WasOnceAMan.
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* ''VideoGame/DragonQuest'':

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* ''VideoGame/DragonQuest'':''Franchise/DragonQuest'':

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* In ''Series/KamenRiderKiva'', a villain turns Wataru into a scary-looking CGI monster and brings him under his control. He eventually breaks free and uses the monster form to kick his would-be master's ass. We see "Kiva Emperor Flight Style" only once more after that, sadly.

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* ''Franchise/KamenRider'':
**
In ''Series/KamenRiderKiva'', a villain turns Wataru into a scary-looking CGI monster and brings him under his control. He eventually breaks free and uses the monster form to kick his would-be master's ass. We see "Kiva Emperor Flight Style" only once more after that, sadly.sadly.
** In ''Series/KamenRiderGaim'', while Hase isn't a face, he's an ineffectual antagonist and one whose antagonist status comes out of innocent bickering between dance teams rather than genuine malice. As soon as his Driver is broken, however, he loses his protection from the compulsion to eat the fruit of Helheim, and shortly thereafter demonstrates that anyone who succumbs to the temptation is transformed into a mindless monster. [[spoiler:He also, however, demonstrates that having worn a Driver makes the transformation take noticeably longer and leave more of the human intact, and Kaito later uses this same process to his advantage in order to ascend to the position of BigBad by taking on a very powerful, very ''intelligent'' monster form.]]
** In ''Series/KamenRiderGeats'', Michinaga flirts with this trope by using a Jyamato Buckle when he turns heel, which he's warned will turn him into a plant-based monster with enough usage on top of how overusing his existing powers have already turned him into a zombie. However, Michinaga successfully wins the Jyamato Grand Prix before he can actually turn into a monster, and wishes himself back to full health alongside gaining a new powerup that's far better than the Jyamato Buckle. He turns face again shortly afterward. [[spoiler:Daichi, meanwhile, ''does'' go through with turning himself into a Jyamato, but turns face near the end of the show while keeping his new MonsterLord form, thus turning all the Jyamato face along with him.]]
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* SelfPerceptionShapeshifting\\
When believing themself a monster physically transforms them into one.
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Adding a relevant fan work

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* The ''WebAnimation/{{RWBY}}'' fic ''Fanfic/ICanAlmostHearTheHounds'' naturally deals with this, given that the premise is that Ruby was taken and turned into a [[TragicMonster Hound.]]

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Example Indentation In Trope Lists: All tropes in a list should be at the same level of indentation, and in alphabetical order. Sub-tropes should not be listed in sub-bullets beneath their parent tropes.


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* AndThenJohnWasAZombie \\
When a protagonist who has been fighting monsters is literally transformed into one such monster (assuming their allegiance changes).
* BeingTorturedMakesYouEvil \\
When someone is tortured until they join the side of their torturers.



** BeingTorturedMakesYouEvil \\
When brainwashing is accomplished by means of torturing them.
** BrainwashedAndCrazy \\
When the brainwashing is enough to turn the person to violence against their former friends.
** BreakTheCutie \\
When this is accomplished by destroying everything that the person values or holds dear.
** MindControl \\
When their allegiance has been forcefully changed by subverting their normal personality.
** MoreThanMindControl\\
When brainwashing together with other factors changes someone's personality or allegiance.
** UsefulNotes/StockholmSyndrome \\
For when the subject has their allegiance changed by more "organic" means.

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** BeingTorturedMakesYouEvil \\
When brainwashing is accomplished by means of torturing them.
**
* BrainwashedAndCrazy \\
When the brainwashing is enough used to turn the a person to violence against their former friends.
** BreakTheCutie \\
When this is accomplished by destroying everything that the person values or holds dear.
** MindControl
* TheCorruption \\
When a force of evil gives its victim superpowers while it mutates them into a monster.
* CyberneticsEatYourSoul \\
When replacing body parts with machinery causes a living person to lose
their allegiance has been forcefully changed by subverting their normal personality.
** MoreThanMindControl\\
When brainwashing together with
humanity or face other factors changes someone's personality or allegiance.
** UsefulNotes/StockholmSyndrome \\
For when the subject has their allegiance changed by more "organic" means.
drawbacks.



** ManySpiritsInsideOfOne\\
When it's done by multiple beings at the same time.
** PossessionBurnout\\
The possessed host's body suffers damage and decay that may quickly destroy it from being possessed.
** TransformationOfThePossessed\\
When demonic possession also involves transforming into a demonic appearance.

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** * ManySpiritsInsideOfOne\\
When it's done by multiple beings hijack a subject's body at the same time.
** PossessionBurnout\\
The possessed host's body suffers damage and decay that may quickly destroy it from being possessed.
** TransformationOfThePossessed\\
* MoreThanMindControl\\
When demonic possession also involves transforming into a demonic appearance.brainwashing together with other factors changes someone's personality or allegiance.



* PersonalityRemnant \\
When a transformed person is still influenced by some of their original personality or attachments.
* PossessionBurnout\\
A possessed host's body suffers damage and decay that may quickly destroy it from being possessed.
* PsychoSerum \\
A serum that gives a person powers also messes him or her up psychologically.



** SuperpoweredEvilSide \\
For when the personality is more powerful when it's in control and a little more interested in co-habitation (or at least can't get rid of the "face" personality).
** PersonalityRemnant \\
When a transformed person is still influenced by some of their original personality or attachments.

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** * SuperpoweredEvilSide \\
For when the a different personality is more powerful when it's in control and a little more interested in co-habitation (or at least can't get rid of the "face" personality).
** PersonalityRemnant \\
When a transformed person is still influenced by some of their original personality or attachments.
personality).



** CyberneticsEatYourSoul \\
When this applies to cybernetic enhancements.
* UnwillingRoboticization \\

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** CyberneticsEatYourSoul \\
* TransformationOfThePossessed\\
When this applies to cybernetic enhancements.
demonic possession also involves transforming into a demonic appearance.
* UnwillingRoboticization UnwillingRoboticisation \\



* VampireRefugee \\
When the character fights their transformation and hopes to find a cure before it overtakes them completely.
* VillainPossessedBystander \\
When the villain transforming random people into minions is a common occurrence.



** AndThenJohnWasAZombie \\
When this happens to a protagonist who has been fighting the virus (assuming their allegiance changes).
** TheCorruption \\
When this gives the infectee evil powers while it mutates him into a monster.
** VampireRefugee \\
When the character fights their transformation and hopes to find a cure before it overtakes them completely.
** VillainPossessedBystander \\
When the villain transforming random people into minions is a common ocurrence.
** ViralTransformation \\
TheVirus causes a physical transformation.

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** AndThenJohnWasAZombie \\
When this happens to a protagonist who has been fighting the virus (assuming their allegiance changes).
** TheCorruption \\
When this gives the infectee evil powers while it mutates him into a monster.
** VampireRefugee \\
When the character fights their transformation and hopes to find a cure before it overtakes them completely.
** VillainPossessedBystander \\
When the villain transforming random people into minions is a common ocurrence.
**
* ViralTransformation \\
TheVirus causes When a physical transformation.transformation that physically changes humans to non-humans can be spread virally.



** PsychoSerum \\
When the serum that gives a person powers also messes him or her up psychologically.



* EmergencyTransformation\\
When the transformation is induced to save a character's life. These characters ''can'' change alignment, but not all do.



* EmergencyTransformation\\
When the transformation is induced to save a character's life. These characters ''can'' change alignment, but not all do.



* Happens to [[spoiler:Death the Kid]] in ''Manga/SoulEater'' while [[spoiler:trapped in Eibon's book.]]
** The whole Dark Side of the series is made of [[WithGreatPowerComesGreatInsanity 'madness']] and its [[SuperPoweredEvilSide effects]].
* In ''Manga/YuYuHakusho'', Urameshi Yusuke [[spoiler:pretends]] this (v.1) has happened when [[spoiler:he comes back from the dead the second time. Just to mess with the racist assholes from the Spirit World who'd been sent to vaporize his corpse to make sure he couldn't arise as a superpowered demon. The dub version ends his FaceHeelTurn speech with PSYCH! and in all versions he puts a shoe on his head and sticks his tongue out. Very funny.]]
** Also worked. Freaked out Koenma very badly too, to a WhatHaveIDone level for a couple of seconds over protecting [[spoiler:the corpse.]] Also any viewers who couldn't keep ahead of the plot and predict the crazy man.
* In ''Manga/DeliciousInDungeon'', this happens to [[spoiler: Falin. She gets mutated into a harpy-like monster by the BigBad, and can likely never be human again. She can, however, be close as possible...maybe.]]
* In the Zanpakuto Tales filler arc of ''Manga/{{Bleach}}'', the {{shinigami}}'s {{Living Weapon}}s were given human forms (turning them into something closer to EquippableAlly) and brainwashed with MoreThanMindControl into fighting them. The following arc dealt with [[MonsterOfTheWeek clearing up]] all the "sword beasts" (Zanpakuto who killed their shinigami before being turned back and went rogue).
* In ''Anime/PuellaMagiMadokaMagica'', this happens to [[spoiler:Sayaka and any other MagicalGirl whose [[TransformationTrinket Soul Gems]] don't get purified]].

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* Happens to [[spoiler:Death the Kid]] in ''Manga/SoulEater'' while [[spoiler:trapped in Eibon's book.]]
** The whole Dark Side of the series is made of [[WithGreatPowerComesGreatInsanity 'madness']] and its [[SuperPoweredEvilSide effects]].
* In ''Manga/YuYuHakusho'', Urameshi Yusuke [[spoiler:pretends]] this (v.1) has happened when [[spoiler:he comes the Zanpakuto Tales {{filler}} arc of ''Manga/{{Bleach}}'', the {{shinigami}}'s {{Living Weapon}}s are given human forms (turning them into something closer to EquippableAlly) and brainwashed with MoreThanMindControl into fighting them. The following arc deals with [[MonsterOfTheWeek clearing up]] all the "sword beasts" (Zanpakuto who killed their shinigami before being turned back and went rogue).
* In ''Anime/CuteHighEarthDefenseClubLove'', the villains are able to turn normal students
from the dead protagonists' school into the second time. Just to mess with the racist assholes from the Spirit World who'd been sent to vaporize his corpse to make sure he couldn't arise as a superpowered demon. The dub version ends his FaceHeelTurn speech with PSYCH! and in all versions he puts a shoe on his head and sticks his tongue out. Very funny.]]
** Also worked. Freaked out Koenma very badly too, to a WhatHaveIDone level for a couple of seconds over protecting [[spoiler:the corpse.]] Also any viewers who couldn't keep ahead of the plot and predict the crazy man.
MonsterOfTheWeek by corrupting them when they're angry about something.
* In ''Manga/DeliciousInDungeon'', this happens to [[spoiler: Falin.[[spoiler:Falin. She gets mutated into a harpy-like monster by the BigBad, and can likely never be human again. She can, however, be close as possible...maybe.]]
maybe]].
* In ''Manga/DemonSlayerKimetsuNoYaiba'', Zenitsu ''almost'' has this happen to him. He was once bitten by a spider which was to go on to mutate him into a mindless demonic human-spider hybrid and a minion of the Older Brother Spider Demon. He was saved by Shinobu and eventually had his shrunken limbs restored to normal. Later in the series, however, actual examples are shown, [[spoiler:first the Upper-1 of the Twelve Kizuki, Kokushibo, is revealed to be a former Demon Slayer of the 1500's, older twin of the legendary Yoriichi Tsugikuni, who betrayed the Corps out of immense jealousy, insecurities and fear of death; then Kaigaku, Zenitsu's former elder colleague in Thunder Breathing, lost a fight to that same Kokushibo and was offered the same path of betrayal, he takes it. In the Zanpakuto Tales filler arc of ''Manga/{{Bleach}}'', end, the {{shinigami}}'s {{Living Weapon}}s were given human forms (turning them last tragedy is Tanjiro himself turning into something closer to EquippableAlly) and brainwashed with MoreThanMindControl a demon, however, he was forced into fighting them. The following arc dealt with [[MonsterOfTheWeek clearing up]] all the "sword beasts" (Zanpakuto who killed it, and everyone alive focused their shinigami efforts on curing him then and there before it became an irreversible situation, thankfully Tanjiro is brought back fast enough]].
* In ''Manga/FairyTail100YearsQuest'', after
being turned back defeated and went rogue).
* In ''Anime/PuellaMagiMadokaMagica'', this happens to [[spoiler:Sayaka
captured by the servants of the Moon Dragon God, Selene, [[spoiler:Natsu and any other MagicalGirl whose [[TransformationTrinket Soul Gems]] don't get purified]].Gray are brought up to entertain Selene and her court, while Happy, and the girls of the team, are all transformed into cruel, predatory yokai, who barely remember their own identities, and have no qualms trying to kill either of the boys]].



* In ''Anime/CuteHighEarthDefenseClubLove,'' the villains are able to turn normal students from the protagonists' school into the MonsterOfTheWeek by corrupting them when they're angry about something.
* In ''Literature/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs'' this eventually happens to [[spoiler: the main character after he starts turning into one of the 17 Beasts. While still able to exert some control over his actions, it’s a losing battle, and he inevitably becomes the final antagonist of the series]].
* In ''Manga/FairyTail100YearsQuest'', after being defeated and captured by the servants of the Moon Dragon God, Selene, [[spoiler: Natsu and Gray are brought up to entertain Selene and her court, while Happy, and the girls of the team, are all transformed into cruel, predatory yokai, who barely remember their own identities, and have no qualms trying to kill either of the boys.]]
* In ''Manga/DemonSlayerKimetsuNoYaiba'', Zenitsu ''almost'' has this happen to him. He was once bitten by a spider which was to go on to mutate him into a mindless demonic human-spider hybrid and a minion of the Older Brother Spider Demon. He was saved by Shinobu and eventually had his shrunken limbs restored to normal. Later in the series, however, actual examples are shown, [[spoiler:first the Upper-1 of the Twelve Kizuki, Kokushibo, is revealed to be a former Demon Slayer of the 1500's, older twin of the legendary Yoriichi Tsugikuni, who betrayed the Corps out of immense jealousy, insecurities and fear of death; then Kaigaku, Zenitsu's former elder colleague in Thunder Breathing, lost a fight to that same Kokushibo and was offered the same path of betrayal, he takes it. In the end, the last tragedy is Tanjiro himself turning into a demon, however, he was forced into it, and everyone alive focused their efforts on curing him then and there before it became an irreversible situation, thankfully Tanjiro is brought back fast enough]].

to:

* In ''Anime/CuteHighEarthDefenseClubLove,'' the villains are able to turn normal students from the protagonists' school into the MonsterOfTheWeek by corrupting them when they're angry about something.
* In ''Literature/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs''
''Anime/PuellaMagiMadokaMagica'', this eventually happens to [[spoiler: [[spoiler:Sayaka and any other MagicalGirl whose [[TransformationTrinket Soul Gems]] don't get purified]].
* ''Manga/SoulEater'':
** This happens to [[spoiler:Death
the main character after he starts turning into one Kid]] while [[spoiler:trapped in Eibon's book]].
** The whole Dark Side
of the 17 Beasts. While still able series is made of [[WithGreatPowerComesGreatInsanity 'madness']] and its [[SuperpoweredEvilSide effects]].
* In ''Manga/YuYuHakusho'', Urameshi Yusuke [[spoiler:pretends]] that this (v.1) has happened when [[spoiler:he comes back from the dead the second time, just
to exert some control mess with the racist assholes from the Spirit World who'd been sent to vaporize his corpse to make sure he couldn't arise as a superpowered demon. The dub version ends his FaceHeelTurn speech with "PSYCH!", and in all versions, he puts a shoe on his head and sticks his tongue out. Very funny]]. It works, and also freaks out Koenma very badly (to a MyGodWhatHaveIDone level for a couple of seconds over his actions, it’s a losing battle, and he inevitably becomes the final antagonist protecting [[spoiler:the corpse]]), as well any readers/viewers who couldn't keep ahead of the series]].
* In ''Manga/FairyTail100YearsQuest'', after being defeated
plot and captured by predict the servants of the Moon Dragon God, Selene, [[spoiler: Natsu and Gray are brought up to entertain Selene and her court, while Happy, and the girls of the team, are all transformed into cruel, predatory yokai, who barely remember their own identities, and have no qualms trying to kill either of the boys.]]
* In ''Manga/DemonSlayerKimetsuNoYaiba'', Zenitsu ''almost'' has this happen to him. He was once bitten by a spider which was to go on to mutate him into a mindless demonic human-spider hybrid and a minion of the Older Brother Spider Demon. He was saved by Shinobu and eventually had his shrunken limbs restored to normal. Later in the series, however, actual examples are shown, [[spoiler:first the Upper-1 of the Twelve Kizuki, Kokushibo, is revealed to be a former Demon Slayer of the 1500's, older twin of the legendary Yoriichi Tsugikuni, who betrayed the Corps out of immense jealousy, insecurities and fear of death; then Kaigaku, Zenitsu's former elder colleague in Thunder Breathing, lost a fight to that same Kokushibo and was offered the same path of betrayal, he takes it. In the end, the last tragedy is Tanjiro himself turning into a demon, however, he was forced into it, and everyone alive focused their efforts on curing him then and there before it became an irreversible situation, thankfully Tanjiro is brought back fast enough]].
crazy man.



* Bruce Banner when he turns into ''Comicbook/TheIncredibleHulk'' (particularly in the original comics where the Hulk started off as a power hungry sociopath who almost considered killing a teenager who knew who he really was).
* In ''Comicbook/{{Amulet}}'', this often happens to Stonekeepers who draw too much on their Amulet's power and become overwhelmed by it in the process, or [[spoiler:fall prey to the manipulations of the Amulet spirit. Particular mention goes to Emily in ''Firelight'', who turns into a giant, flaming, phoenix.]]
* ''{{ComicBook/Revolutionaries}}'': After he dies, [[spoiler:Domitius Major]] is [[BackFromTheDead reanimated by the Talisman]]... as a [[CameBackWrong nightmarish]] WormThatWalks zombie that attacks anything the Talisman tells it to.
* The ''ComicBook/BatmanVampire'' trilogy basically sees this happen to Batman after he is transformed into a vampire, his determination to continue acting as a hero eventually faltering as he succumbs to the thirst for human blood, only able to control himself just enough so that he doesn't kill innocent people but only targets Gotham's existing criminals.

to:

* Bruce Banner when he turns into ''Comicbook/TheIncredibleHulk'' (particularly in the original comics where the Hulk started off as a power hungry sociopath who almost considered killing a teenager who knew who he really was).
* In ''Comicbook/{{Amulet}}'', ''ComicBook/{{Amulet}}'', this often happens to Stonekeepers who draw too much on their Amulet's power and become overwhelmed by it in the process, or [[spoiler:fall prey to the manipulations of the Amulet spirit. Particular mention goes to Emily in ''Firelight'', who turns into a giant, flaming, phoenix.]]
flaming phoenix]].
* ''{{ComicBook/Revolutionaries}}'': The ''ComicBook/BatmanVampire'' trilogy basically sees this happen to ComicBook/{{Batman}} after he is transformed into a vampire, his determination to continue acting as a hero eventually faltering as he succumbs to the thirst for human blood, only able to control himself just enough so that he doesn't kill innocent people but only targets Gotham's existing criminals.
* Bruce Banner when he turns into ''Comicbook/TheIncredibleHulk'', particularly in the original comics, in which the Hulk starts off as a power-hungry sociopath who almost considers killing a teenager who knows who he really is.
* ''ComicBook/{{Revolutionaries}}'':
After he dies, [[spoiler:Domitius Major]] is [[BackFromTheDead reanimated by the Talisman]]... as a [[CameBackWrong nightmarish]] WormThatWalks zombie that attacks anything the Talisman tells it to.
* The ''ComicBook/BatmanVampire'' trilogy basically sees this happen ''ComicBook/SpiderMan'': Curt Conners is by all accounts a good man: devoted husband and father, brilliant scientist, and dedicated to Batman after he is transformed helping amputees... by developing experimental lizard gene therapy that turns him into a vampire, his determination to continue acting as a hero eventually faltering as he succumbs to the thirst for human blood, only able to control himself just enough so that he doesn't kill innocent people but only targets Gotham's existing criminals.Lizard.



* [[Comicbook/SpiderMan Curt Conners]] is by all accounts a good man: devoted husband and father, brilliant scientist, and dedicated to helping amputees...by developing experimental lizard gene therapy that turns him into the Lizard.



* In the MagicalGirl CrisisCrossover ''FanFic/ShatteredSkiesTheMorningLights'', [[Franchise/SailorMoon Sailor Jupiter]] is hit with an [[Manga/PuellaMagiKazumiMagica Evil Nut]] and turns into a Pseudo-[[Franchise/MadokaMagica Witch]], Mami Tomoe and Kyoko Sakura are forcibly transformed into "Witch-Hybrids", halfway between their human and Witch forms, and [[Anime/HappinessChargePrettyCure Cure Fortune]] is [[YouWillBeAssimilated assimilated]] by an upgraded [[Anime/SailorMoon Droid Jamanen]] via horrific OrificeInvasion, which converts her into a "drone" SlimeGirl under Jamanen's total control.
* In the final act of ''FanFic/AmongUsInCharacter'', [[TheHero Drama]] is taken over by an alien parasite that twists her body and mind and uses her to go after the remaining crewmates.
* Fanfic/KingdomHeartsTheAntipode: In the fourth installment ''All That's Left'', [[WesternAnimation/Frozen2013 Elsa]] is stabbed in the heart with a shard of [[MagicMirror enchanted glass]], forcefully [[TheCorruption corrupting]] her and [[AccentuateTheNegative making her see only the ugly in the world]] (A callback to the [[Literature/TheSnowQueen original fairy tale]]).
* In the ''Videogame/TheLegendOfZeldaBreathOfTheWild'' novelization named ''Fanfic/BreathOfTheWild'', it's revealed when Link draws the Master Sword that [[spoiler: Ganondorf/Ganon was meant to be a hero fighting alongside Link and Zelda. All three of them were meant to fight Demise's curse over generations, each incarnation growing stronger and stronger until they finally could wield the full power of the three spirit animals, the Boar for Ganondorf, the Wolf for Link, the Owl for Zelda. However, Ganodorf was possessed and corrupted by that very curse. This imagery is symbolized in a vision by the originally beautiful magenta Boar Spirit suddenly turning dark and filling with black until it became Calamity Ganon.]]

to:

* In the MagicalGirl CrisisCrossover ''FanFic/ShatteredSkiesTheMorningLights'', [[Franchise/SailorMoon Sailor Jupiter]] is hit with an [[Manga/PuellaMagiKazumiMagica Evil Nut]] and turns into a Pseudo-[[Franchise/MadokaMagica Witch]], Mami Tomoe and Kyoko Sakura are forcibly transformed into "Witch-Hybrids", halfway between their human and Witch forms, and [[Anime/HappinessChargePrettyCure Cure Fortune]] is [[YouWillBeAssimilated assimilated]] by an upgraded [[Anime/SailorMoon Droid Jamanen]] via horrific OrificeInvasion, which converts her into a "drone" SlimeGirl under Jamanen's total control.
* In the final act of ''FanFic/AmongUsInCharacter'', ''Fanfic/AmongUsInCharacter'', [[TheHero Drama]] is taken over by an alien parasite that twists her body and mind and uses her to go after the remaining crewmates.
* Fanfic/KingdomHeartsTheAntipode: ''Fanfic/KingdomHeartsTheAntipode'': In the fourth installment installment, ''All That's Left'', [[WesternAnimation/Frozen2013 Elsa]] is stabbed in the heart with a shard of [[MagicMirror enchanted glass]], forcefully [[TheCorruption corrupting]] her and [[AccentuateTheNegative making her see only the ugly in the world]] (A callback (a reference to the [[Literature/TheSnowQueen original fairy tale]]).
* In the ''Videogame/TheLegendOfZeldaBreathOfTheWild'' novelization named ''Fanfic/BreathOfTheWild'', ''Fanfic/TheMythOfLinkAndZeldaBreathOfTheWild'', it's revealed when Link draws the Master Sword that [[spoiler: Ganondorf/Ganon [[spoiler:Ganondorf/Ganon was meant to be a hero fighting alongside Link and Zelda. All three of them were meant to fight Demise's curse over generations, each incarnation growing stronger and stronger until they finally could wield the full power of the three spirit animals, the Boar for Ganondorf, the Wolf for Link, the Owl for Zelda. However, Ganodorf was possessed and corrupted by that very curse. This imagery is symbolized in a vision by the originally beautiful magenta Boar Spirit suddenly turning dark and filling with black until it became Calamity Ganon.]]Ganon]].
* In ''Fanfic/ShatteredSkiesTheMorningLights'', [[Franchise/SailorMoon Sailor Jupiter]] is hit with an [[Manga/PuellaMagiKazumiMagica Evil Nut]] and turns into a Pseudo-[[Franchise/MadokaMagica Witch]], Mami Tomoe and Kyoko Sakura are forcibly transformed into "Witch-Hybrids", halfway between their human and Witch forms, and [[Anime/HappinessChargePrettyCure Cure Fortune]] is [[YouWillBeAssimilated assimilated]] by an upgraded [[Anime/SailorMoon Droid Jamanen]] via horrific OrificeInvasion, which converts her into a "drone" SlimeGirl under Jamanen's total control.



* ''WesternAnimation/{{Aladdin}}''. When Jafar finally gets his hands on the lamp thus controlling the genie (who has to obey his evil master even though he doesn't want to harm Aladdin).

to:

* ''WesternAnimation/{{Aladdin}}''. ''WesternAnimation/{{Aladdin}}'': When Jafar finally gets his hands on the lamp lamp, thus controlling the genie (who has to obey his evil master even though he doesn't want to harm Aladdin).Aladdin).
* Vakama in ''Toys/{{Bionicle}} 3: Web of Shadows''. While he was shown to be on shaky terms with his team even prior to his mutation into a half-beast, he only turned evil due to Roodaka taking advantage of his bestial impulses.



* Vakama in ''WesternAnimation/{{Bionicle}} 3: Web of Shadows''. While he was shown to be on shaky terms with his team even prior to his mutation into a half-beast, he only turned evil due to Roodaka taking advantage of his bestial impulses.



* In ''Film/VanHelsing'', [[spoiler:the titular character]] gets bitten by a werewolf and turns into one. [[spoiler:Although he fights and ends up killing Dracula,]] he is still a monster [[spoiler: and ends up killing his female companion before she can cure him.]]
* In ''Film/ResidentEvilApocalypse'', a hero from the first is turned into Nemesis and sent to fight Alice and the heroes. Eventually she does manage to [[IKnowYoureInThereSomewhereFight reach him]] and get him to break their control.
* This happen in almost every zombie film, where even the most heroic character could turn into a villain after being bitten by a zombie.
* The clone troops who were forced to turn against the Jedi by an implanted command in ''[[Film/RevengeOfTheSith Star Wars: Revenge of the Sith]]''.
* In the ''Film/StreetFighter'' movie, this is the goal of Bison's SuperSoldier program, starting by turning Guile's friend Blanka into a green monster. Thankfully, while he was being brainwashed the scientist in charge switched the "Evil" off and turned the "Good" on, allowing for a 40 / 60 % mix of Evil to Good, respectively (more or less, it's been a while).
* In ''Film/IndianaJonesAndTheTempleOfDoom,'' Indy is made into a zombie-slave, though later recovers.

to:

* In ''Film/VanHelsing'', [[spoiler:the titular character]] gets bitten by a werewolf and turns ''Film/IndianaJonesAndTheTempleOfDoom'', Indy is made into one. [[spoiler:Although a zombie-slave, though he fights and ends up killing Dracula,]] he is still a monster [[spoiler: and ends up killing his female companion before she can cure him.]]
later recovers.
* In ''Film/ResidentEvilApocalypse'', a hero from [[Film/ResidentEvil2002 the first movie]] is turned into Nemesis and sent to fight Alice and the heroes. Eventually she does manage to [[IKnowYoureInThereSomewhereFight reach him]] and get him to break their control.
* This happen in almost every zombie film, where even the most heroic character could turn into a villain after being bitten by a zombie.
* The clone troops who were are forced to turn against the Jedi by an implanted command in ''[[Film/RevengeOfTheSith Star Wars: Revenge of the Sith]]''.
''Film/RevengeOfTheSith''.
* In the ''Film/StreetFighter'' movie, ''Film/StreetFighter'', this is the goal of Bison's SuperSoldier program, starting by turning Guile's friend Blanka into a green monster. Thankfully, while he was being brainwashed the scientist in charge switched the "Evil" off and turned the "Good" on, allowing for a 40 / 60 % mix of Evil to Good, respectively (more or less, it's been a while).
* In ''Film/IndianaJonesAndTheTempleOfDoom,'' Indy is made ''Film/VanHelsing'', [[spoiler:the titular character]] gets bitten by a werewolf and turns into one. [[spoiler:Although he fights and ends up killing Dracula]], he is still a zombie-slave, though later recovers.monster [[spoiler:and ends up killing his female companion before she can cure him]].



* ''Literature/FateOfTheJedi'': [[spoiler:Abeloth after she drank from the Fountain of Power and took a bath in the Pool of Knowledge to be like the Ones.]]



* ''Literature/FateOfTheJedi'': [[spoiler:Abeloth after she drank from the Fountain of Power and took a bath in the Pool of Knowledge to be like the Ones.]]

to:

* ''Literature/FateOfTheJedi'': [[spoiler:Abeloth In ''Literature/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs'', this eventually happens to [[spoiler:the main character after she drank from he starts turning into one of the Fountain of Power 17 Beasts. While still able to exert some control over his actions, it’s a losing battle, and took a bath in he inevitably becomes the Pool final antagonist of Knowledge to be like the Ones.]]series]].



* ''Series/{{Highlander}}'': Immortals can be corrupted by absorbing to much evil from the quickenings of wicked immortals and in turn pass on that corruption in the form of a dark quickening. Duncan is only known immortal in the canon of the TV Show to overcome being turned by one.
* ''Series/StarTrekTheOriginalSeries'':
** In "[[Recap/StarTrekS2E7Catspaw Catspaw]]", some of the crew are made into zombie-slaves by the witch-alien.
** Previously, it had happened in "[[Recap/StarTrekS1E21TheReturnOfTheArchons The Return of the Archons]]", where Sulu is turned into one of Landru's followers.
* Jean-Luc Picard being turned into Locutus of Borg in the ''Series/StarTrekTheNextGeneration'' episode(s) "[[Recap/StarTrekTheNextGenerationS3E26S4E1TheBestOfBothWorlds The Best of Both Worlds]]".
* ''Series/StarTrekVoyager'': in "[[Recap/StarTrekVoyagerS5E25S6E1Equinox Equinox]]", when the captain of the titular ship deletes the Doctor's ethical subroutines, and then has him essentially torture Seven of Nine.
* Subverted, inverted and played straight in the case of Angel from ''Series/BuffyTheVampireSlayer'': he was a jackass who was turned into a monster, was forcibly given back his soul and instead of returning to his jackass original personality, became a good guy, who was then turned back into a monster, and ''back'' into a good guy several times.
** It's the reason he doesn't go by his former human name even when he's a good guy, he's NOT that person anymore. By the time he gets cursed with a soul, he'd been a vampire for about five times longer than he was ever human. He still considers himself a monster, just one capable of feeling guilt for his actions.
* In ''Series/KamenRiderKiva,'' a villain turns Wataru into a scary-looking CGI monster and brings him under his control. He eventually breaks free and uses the monster form to kick his would-be master's ass. We see "Kiva Emperor Flight Style" only once more after that, sadly.
* In ''Franchise/PowerRangers,'' this happens to civilians on an "a few times in some seasons" basis. A person is turned into a MonsterOfTheWeek, and acts like a MonsterOfTheWeek until he is freed. Whether blowing up the monster form with a FinishingMove will free the person or is something that would kill him so the Rangers have to come up with something else varies (though in ''Series/PowerRangersDinoThunder,'' kaboom always works.)
** In ''Series/PowerRangersRPM'', Dillon had cyborg implants that would occasionally try to take over. In the finale, it was revealed that [[spoiler:[[OhCrap this also applies to half the city.]]]]

to:

* Subverted, inverted and played straight in the case of Angel from ''Series/BuffyTheVampireSlayer'' [[Franchise/{{Buffyverse}} and]] ''Series/{{Angel}}'': he was a jackass who was turned into a monster, was forcibly given back his soul and instead of returning to his jackass original personality, became a good guy, who was then turned back into a monster, and ''back'' into a good guy several times. It's the reason why he doesn't go by his former human name even when he's a good guy; he's ''not'' that person anymore. By the time he gets cursed with a soul, he'd been a vampire for about five times longer than he was ever human. He still considers himself a monster, just one capable of feeling guilt for his actions.
* In ''Series/Charmed1998'', it becomes a RunningGag how often each of the girls gets transformed into a {{wendigo}}/[[OurVampiresAreDifferent vampire]]/[[OurDemonsAreDifferent demon]]/[[Myth/ClassicalMythology Fury]] and has to be saved by the others. (They also turn into good creatures a lot, too.)
* ''Series/{{Highlander}}'': Immortals can be corrupted by absorbing to much evil from the quickenings of wicked immortals and in turn pass on that corruption in the form of a dark quickening. Duncan is only known immortal in the canon of the TV Show show to overcome being turned by one.
* ''Series/StarTrekTheOriginalSeries'':
** In "[[Recap/StarTrekS2E7Catspaw Catspaw]]", some of the crew are made into zombie-slaves by the witch-alien.
** Previously, it had happened in "[[Recap/StarTrekS1E21TheReturnOfTheArchons The Return of the Archons]]", where Sulu is turned into one of Landru's followers.
* Jean-Luc Picard being turned into Locutus of Borg in the ''Series/StarTrekTheNextGeneration'' episode(s) "[[Recap/StarTrekTheNextGenerationS3E26S4E1TheBestOfBothWorlds The Best of Both Worlds]]".
* ''Series/StarTrekVoyager'': in "[[Recap/StarTrekVoyagerS5E25S6E1Equinox Equinox]]", when the captain of the titular ship deletes the Doctor's ethical subroutines, and then has him essentially torture Seven of Nine.
* Subverted, inverted and played straight in the case of Angel from ''Series/BuffyTheVampireSlayer'': he was a jackass who was turned into a monster, was forcibly given back his soul and instead of returning to his jackass original personality, became a good guy, who was then turned back into a monster, and ''back'' into a good guy several times.
** It's the reason he doesn't go by his former human name even when he's a good guy, he's NOT that person anymore. By the time he gets cursed with a soul, he'd been a vampire for about five times longer than he was ever human. He still considers himself a monster, just one capable of feeling guilt for his actions.
one.
* In ''Series/KamenRiderKiva,'' ''Series/KamenRiderKiva'', a villain turns Wataru into a scary-looking CGI monster and brings him under his control. He eventually breaks free and uses the monster form to kick his would-be master's ass. We see "Kiva Emperor Flight Style" only once more after that, sadly.
* In ''Franchise/PowerRangers,'' this ''Franchise/PowerRangers'':
** This
happens to civilians on an "a few times in some seasons" basis. A person is turned into a MonsterOfTheWeek, and acts like a MonsterOfTheWeek until he is freed. Whether blowing up the monster form with a FinishingMove will free the person or is something that would kill him so the Rangers have to come up with something else varies (though in ''Series/PowerRangersDinoThunder,'' ''Series/PowerRangersDinoThunder'', kaboom always works.)
works).
** In ''Series/PowerRangersRPM'', Dillon had has cyborg implants that would occasionally try to take over. In the finale, it was is revealed that [[spoiler:[[OhCrap this also applies to half the city.]]]]city]]]].
* ''Franchise/StarTrek'':
** ''Series/StarTrekTheOriginalSeries'':
*** In "[[Recap/StarTrekS1E21TheReturnOfTheArchons The Return of the Archons]]", Sulu is turned into one of Landru's followers.
*** In "[[Recap/StarTrekS2E7Catspaw Catspaw]]", some of the crew are made into zombie-slaves by the witch-alien.
** Jean-Luc Picard is turned into [[MouthOfSauron Locutus of Borg]] in the ''Series/StarTrekTheNextGeneration'' episode(s) "[[Recap/StarTrekTheNextGenerationS3E26S4E1TheBestOfBothWorlds The Best of Both Worlds]]".
** In the ''Series/StarTrekVoyager'' episode "[[Recap/StarTrekVoyagerS5E25S6E1Equinox Equinox]]", the captain of the titular ship deletes the Doctor's ethical subroutines, and then has him essentially torture Seven of Nine.



** [[spoiler:Dean]] is transformed into a demon by [[spoiler:the Mark of Cain]] in the S9 finale, and remained so for four episodes before being cured.
** [[spoiler:Sam]] underwent something similar in S6 due to [[spoiler:Castiel]] accidentally [[CameBackWrong resurrecting him without a soul.]]
* In ''Series/{{Charmed|1998}},'' it became a RunningGag how often each of the girls got transformed into a {{wendigo}}/[[OurVampiresAreDifferent vampire]]/[[OurDemonsAreDifferent demon]]/[[Myth/ClassicalMythology Fury]] and had to be saved by the others. (They also turned into good creatures a lot, too.)

to:

** [[spoiler:Sam]] undergoes this in Season 6 due to [[spoiler:Castiel]] accidentally [[CameBackWrong resurrecting him without a soul]].
** [[spoiler:Dean]] is transformed into a demon by [[spoiler:the Mark of Cain]] in the S9 Season 9 finale, and remained remains so for four episodes before being cured.
** [[spoiler:Sam]] underwent something similar in S6 due to [[spoiler:Castiel]] accidentally [[CameBackWrong resurrecting him without a soul.]]
* In ''Series/{{Charmed|1998}},'' it became a RunningGag how often each of the girls got transformed into a {{wendigo}}/[[OurVampiresAreDifferent vampire]]/[[OurDemonsAreDifferent demon]]/[[Myth/ClassicalMythology Fury]] and had to be saved by the others. (They also turned into good creatures a lot, too.)
cured.



* Happens often in Greek mythology, as looking like a monster is [[BeautyEqualsGoodness apparently synonymous with being evil]]. Scylla and Medusa are both well known examples: women who were cursed for things that weren't their fault and became vicious and destructive as a result.

to:

* Happens This happens often in Greek mythology, Myth/ClassicalMythology, as looking like a monster is [[BeautyEqualsGoodness apparently synonymous with being evil]]. Scylla and Medusa are both well known well-known examples: women who were cursed for things that weren't their fault and became vicious and destructive as a result.



* The (indirect){{trope namer}} here would likely be Wrestling/FightingOperaHustle, where the main {{power stable}} the [[Wrestling/NobuhikoTakada Takada Monster Army]], had set out to destroy professional wrestling [[ExactlyWhatItSaysOnTheTin using an army of]] [[WrestlingMonster monsters]] and would {{brainwash|ing}} professional wrestlers, turning them into monsters for its cause. Not even Wrestling/GenichiroTenryu, the most stubborn practitioner of tradition puroresu who had gone toe to toe with shooters of all kinds, was immune!

to:

* The (indirect){{trope namer}} (indirect) {{Trope Namer|s}} here would likely be Wrestling/FightingOperaHustle, where in which the main {{power stable}} PowerStable, the [[Wrestling/NobuhikoTakada Takada Monster Army]], had set out to destroy professional wrestling [[ExactlyWhatItSaysOnTheTin using an army of]] [[WrestlingMonster monsters]] {{Wrestling Monster}}s and would {{brainwash|ing}} {{brainwashed}} professional wrestlers, turning them into monsters for its cause. Not even Wrestling/GenichiroTenryu, the most stubborn practitioner of tradition puroresu who had gone toe to toe with shooters of all kinds, was immune!



* The penultimate boss in ''VideoGame/FreedomPlanet'' is [[spoiler:Milla, who has been [[CorruptTheCutie corrupted]] by Lord Brevon into a monster]]. Lilac or Carol is [[MercyKill forced to kill]] this character [[PlayerPunch in order to advance]]. [[spoiler:Or so it seems. Milla survives, but just barely.]] However, playing as the spoiler character [[SkippableBoss skips this boss battle entirely]], since the character [[DevelopersForesight can't fight themselves]].

to:

* ''VideoGame/AoOni'', specifically, version [[spoiler:6. Takeshi even tries to kill himself to avoid this. [[OhCrap It doesn't work]]]].
* While not on the "Good" side, the scientists turned into purple spider-zombies in ''VideoGame/AzureStrikerGunvolt'' possibly count.
* ''VideoGame/CaveStory'': The Doctor feeds [[PsychoSerum red flowers]] [[PlayerPunch to one of your allies]], turning her into a [[TragicMonster frenzied monster]] and [[TearJerker forcing you to kill her]]. Near the end, he also transforms [[spoiler:your friend Sue and his minion Misery into monsters to help him in the fight (Sue gets better; Misery's fate isn't explored, but she was apparently able to [[MistreatmentInducedBetrayal send Balrog to help you]] escape from the BonusLevelOfHell)]].
* In ''VideoGame/DisneyPrincessEnchantedJourney'', the Bogs are actually captured butterflies that were forced into evil, and return to their natural state once defeated.
* ''VideoGame/DragonQuest'':
** Togres from ''VideoGame/DragonQuestVII'', [[AllThereInTheManual according to]] their ''VideoGame/DragonQuestX'' [[MonsterCompendium bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment.
** From ''VideoGame/DragonQuestX'' itself, Zombie Paladins were once Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].
* The penultimate boss in ''VideoGame/FreedomPlanet'' is [[spoiler:Milla, who has been [[CorruptTheCutie corrupted]] by Lord Brevon into a monster]]. Lilac or Carol is [[MercyKill forced to kill]] this character [[PlayerPunch in order to advance]]. [[spoiler:Or advance]] [[spoiler:(or so it seems. seems; Milla survives, but just barely.]] barely)]]. However, playing as the spoiler character [[SkippableBoss skips this boss battle entirely]], since the character [[DevelopersForesight can't fight themselves]].themselves]].
* In ''VideoGame/Mother3'', [[spoiler:Lucas's twin brother Claus (who was either seriously injured or dead) is turned into a cyborg and mindless slave by the Pigmask Army]]. However, we [[IKnowYoureInThereSomewhereFight know he's in there]].
* ''VideoGame/Persona2: Eternal Punishment'' provides the page quote above. For context, Ulala, one of the main heroes, drunkenly invokes the JOKER Curse on Maya by calling her own phone number (which summons a serial killer to try to murder whoever the caller wishes) during a moment of weakness over her inferiority to Maya's success. Unfortunately, later in the game, the villains cause anyone who's called the number to turn into a [[MonsterClown JOKER]] themselves -- Ulala is ''not'' immune to this, and Maya, Katsuya, and Baofu have to fight her to free her.
* In ''VideoGame/QuakeIV'', the PlayerCharacter is [[{{Cyborg}} Stroggified]], but his comrades rescue him before his mind control chip can be activated, thus making him a PhlebotinumRebel.



* In ''VideoGame/{{Mother 3}}'', [[spoiler:Lucas's twin brother Claus (who was either seriously injured or dead) is turned into a cyborg and mindless slave by the Pigmask Army.]]
** But we [[IKnowYoureInThereSomewhereFight knew he was in there.]]



** In ''VideoGame/ResidentEvilOutbreak File #2'' the third series Tyrant helps the players at first (since it's been programmed to protect humans and destroy hunters). Then it gets damaged, loses its PowerLimiter, mutates even more and goes crazy.
*** Also, if a player dies then they turn into a zombie (or a more powerful RoamingEnemy in one level).

to:

** In ''VideoGame/ResidentEvilOutbreak File #2'' Brad Vickers survives the third series Tyrant helps the players at first (since it's been programmed ''VideoGame/ResidentEvil1'' just to protect humans and destroy hunters). Then it gets damaged, loses its PowerLimiter, mutates even more and goes crazy.
*** Also, if a player dies then they turn into a
show up in ''VideoGame/ResidentEvil2'' as an optional zombie (or a more powerful RoamingEnemy in one level). encounter. ''[[VideoGame/ResidentEvil3Nemesis 3]]'' shows ''how'' he was zombified.



** Even as far back as the [[VideoGame/ResidentEvil2 second game]], Brad Vickers survives the first ''VideoGame/ResidentEvil1'' just to show up in ''2'' as an optional zombie encounter. ''[[VideoGame/ResidentEvil3Nemesis 3]]'' shows ''how'' he was zombified.
* In ''VideoGame/CaveStory'', The Doctor feeds [[PsychoSerum red flowers]] [[PlayerPunch to one of your allies]], turning her into a [[TragicMonster frenzied monster]] and [[TearJerker forcing you to kill her]].
** Near the end he also transforms [[spoiler: your friend Sue and his minion Misery into monsters to help him in the fight (Sue gets better, Misery's fate isn't explored but she was apparently able to [[MistreatmentInducedBetrayal send Balrog to help you]] escape from the BonusLevelOfHell).]]
* In ''VideoGame/{{Quake IV}}'', the player character is [[{{Cyborg}} Stroggified]], but his comrades rescue him before his mind control chip can be activated, thus making him a PhlebotinumRebel.
* In ''Zenonia 3: The Midgard Story,'' [[ThatOneBoss Ekinard's]] [[TheVirus toxin]] leaks into the rivers on Maru Island and causes anyone who drinks the water to [[ViralTransformation turn into a monster.]]

to:

** Even as far back as In ''VideoGame/ResidentEvilOutbreak File #2'', the [[VideoGame/ResidentEvil2 second game]], Brad Vickers survives third series Tyrant helps the players at first ''VideoGame/ResidentEvil1'' just (since it's been programmed to show up in ''2'' as an optional zombie encounter. ''[[VideoGame/ResidentEvil3Nemesis 3]]'' shows ''how'' he was zombified.
* In ''VideoGame/CaveStory'', The Doctor feeds [[PsychoSerum red flowers]] [[PlayerPunch to one of your allies]], turning her into a [[TragicMonster frenzied monster]]
protect humans and [[TearJerker forcing you to kill her]].
** Near the end he also transforms [[spoiler: your friend Sue and his minion Misery into monsters to help him in the fight (Sue
destroy hunters). Then it gets better, Misery's fate isn't explored but she was apparently able to [[MistreatmentInducedBetrayal send Balrog to help you]] escape from the BonusLevelOfHell).]]
* In ''VideoGame/{{Quake IV}}'', the
damaged, loses its PowerLimiter, mutates even more and goes crazy. Also, if a player character is [[{{Cyborg}} Stroggified]], but his comrades rescue him before his mind control chip can be activated, thus making him a PhlebotinumRebel.
* In ''Zenonia 3: The Midgard Story,'' [[ThatOneBoss Ekinard's]] [[TheVirus toxin]] leaks into the rivers on Maru Island and causes anyone who drinks the water to [[ViralTransformation
dies, they turn into a monster.]]zombie (or a more powerful RoamingEnemy in one level).
* In ''VideoGame/ShadowHeartsFromTheNewWorld'', [[spoiler:Edna Capone]] suffers from this after being revived with the power of Malice.
* ''VideoGame/SoulSeries'': Already teetering on the edge of being utterly mental, {{Tragic Hero}} Siegfried Schtauffen in the original ''Soul Edge'' is completely consumed by the eponymous Evil Sword when he finally takes possession of it, turning him into the Soul Edge manifest; a rampaging demon-knight known as Nightmare.



* ''VideoGame/AoOni'', specifically, version [[spoiler:6. Takeshi even tries to kill himself to avoid this. [[OhCrap It doesn't work.]]]]
* Already teetering on the edge of being utterly mental, {{Tragic Hero}} Siegfried Schtauffen in the original ''[[VideoGame/SoulCalibur Soul Edge]]'' is completely consumed by the eponymous Evil Sword when he finally takes possession of it, turning him into the Soul Edge manifest; a rampaging demon-knight known as Nightmare.
* ''VideoGame/Persona2: Eternal Punishment'' provides the page quote above. For context, Ulala, one of the main heroes, drunkenly invokes the JOKER Curse on Maya by calling her own phone number (which summons a serial killer to try to murder whoever the caller wishes) during a moment of weakness over her inferiority to Maya's success. Unfortunately, later in the game, the villains cause anyone who's called the number to turn into a [[MonsterClown JOKER]] themselves - Ulala is ''not'' immune to this, and Maya, Katsuya, and Baofu have to fight her to free her.
* In ''VideoGame/DisneyPrincessEnchantedJourney'', the Bogs are actually captured butterflies that were forced into evil, and return to their natural state once defeated.
* While not on the "Good" side, the scientists turned into purple spider-zombies in ''VideoGame/AzureStrikerGunvolt'' possibly count
* In ''VideoGame/ShadowHeartsFromTheNewWorld'', [[spoiler:Edna Capone]] suffers from this after being revived with the power of Malice.
* ''VideoGame/DragonQuest'': Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].

to:

* ''VideoGame/AoOni'', specifically, version [[spoiler:6. Takeshi even tries to kill himself to avoid this. [[OhCrap It doesn't work.]]]]
* Already teetering on the edge of being utterly mental, {{Tragic Hero}} Siegfried Schtauffen in the original ''[[VideoGame/SoulCalibur Soul Edge]]'' is completely consumed by the eponymous Evil Sword when he finally takes possession of it, turning him
In ''VideoGame/{{Zenonia}} 3: The Midgard Story'', [[ThatOneBoss Ekinard]]'s [[TheVirus toxin]] leaks into the Soul Edge manifest; a rampaging demon-knight known as Nightmare.
* ''VideoGame/Persona2: Eternal Punishment'' provides the page quote above. For context, Ulala, one of the main heroes, drunkenly invokes the JOKER Curse
rivers on Maya by calling her own phone number (which summons a serial killer to try to murder whoever the caller wishes) during a moment of weakness over her inferiority to Maya's success. Unfortunately, later in the game, the villains cause Maru Island and causes anyone who's called who drinks the number water to [[ViralTransformation turn into a [[MonsterClown JOKER]] themselves - Ulala is ''not'' immune to this, and Maya, Katsuya, and Baofu have to fight her to free her.
* In ''VideoGame/DisneyPrincessEnchantedJourney'', the Bogs are actually captured butterflies that were forced into evil, and return to their natural state once defeated.
* While not on the "Good" side, the scientists turned into purple spider-zombies in ''VideoGame/AzureStrikerGunvolt'' possibly count
* In ''VideoGame/ShadowHeartsFromTheNewWorld'', [[spoiler:Edna Capone]] suffers from this after being revived with the power of Malice.
* ''VideoGame/DragonQuest'': Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].
monster]].



* Blackarachnia from ''WesternAnimation/TransformersAnimated'' actually turned to the side of the Decepticons after mutating into an organic spider.
** Wasp also became a Decepticon after Blackarachnia mutated him into an organic wasp shortly after he vowed revenge on [[KidAppealCharacter Bumblebee]] for (accidentally) sending him to prison, though he'd been trying to take Bee down for some time before. The Decepticon symbol his new form inexplicably has is basically there 'cause the toy has it.



* In ''WesternAnimation/MiraculousLadybug,'' the main villain, Hawk Moth, has the power to [[SuperEmpowering turn normal people]] into the VillainOfTheWeek by preying on them in [[MomentOfWeakness moments of anger or depression]]. One of Ladybug's powers is to purify the akumas that possess them, turning them back to normal.
* Happened in the backstory of ''WesternAnimation/StevenUniverse''. Those monsters the Crystal Gems are always fighting? [[spoiler:They’re other Gems. At the end of [[GreatOffscreenWar the Gem War]], Homeworld deployed a FantasticNuke that [[TheCorruption mutated and corrupted]] every Gem caught in its range. Pearl, Garnet, and Rose were the only Crystal Gems who escaped it and they spent most of their time since capturing their former friends and enemies to stop them from hurting people.]]
* In ''WesternAnimation/StevenUniverseFuture,'' of all people, [[spoiler:''Steven himself'' suffers one of these during his mental breakdown in the episode "[[Recap/StevenUniverseFutureS1E18EverythingsFine Everything's Fine]]". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his [[PowerIncontinence uncontrollable powers]], corrupted him and turned him into a pink Kaiju-like monster. He gets better at the end of "[[Recap/StevenUniverseFutureS1E19IAmMyMonster I Am My Monster]]".]]
* ''WesternAnimation/{{Witch}}'': In the cartoon version, Nerissa creates two additional Knights of Destruction as her minions, turning Matt (Will's boyfriend) and Mr. Huggins (Matt's pet dormouse) into Shagon and Khor, respectively. Most of the time, the girls aren't aware that Shagon and Khor are actually their friends turned into evil monsters.

to:

* In ''WesternAnimation/MiraculousLadybug,'' ''WesternAnimation/MiraculousLadybug'', the main villain, Hawk Moth, has the power to [[SuperEmpowering turn normal people]] into the VillainOfTheWeek MonsterOfTheWeek by preying on them in [[MomentOfWeakness moments of anger or depression]]. One of Ladybug's powers is to purify the akumas that possess them, turning them back to normal.
* Happened This happened in the backstory {{backstory}} of ''WesternAnimation/StevenUniverse''. Those monsters the Crystal Gems are always fighting? [[spoiler:They’re [[spoiler:They're other Gems. At the end of [[GreatOffscreenWar the Gem War]], Homeworld deployed a FantasticNuke that [[TheCorruption mutated and corrupted]] every Gem caught in its range. Pearl, Garnet, and Rose were the only Crystal Gems who escaped it it, and they spent most of their time since capturing their former friends and enemies to stop them from hurting people.]]
* In ''WesternAnimation/StevenUniverseFuture,'' ''WesternAnimation/StevenUniverseFuture'', of all people, [[spoiler:''Steven himself'' suffers one of these during his mental breakdown in the episode "[[Recap/StevenUniverseFutureS1E18EverythingsFine Everything's Fine]]". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his [[PowerIncontinence uncontrollable powers]], corrupted him and turned him into a pink Kaiju-like {{Kaiju}}[=-=]like monster. He gets better at the end of "[[Recap/StevenUniverseFutureS1E19IAmMyMonster I Am My Monster]]".]]
Monster]]"]].
* ''WesternAnimation/{{Witch}}'': In ''WesternAnimation/TransformersAnimated'':
** Blackarachnia actually turned to
the cartoon version, side of the Decepticons after mutating into an organic spider.
** Wasp also became a Decepticon after Blackarachnia mutated him into an organic wasp shortly after he vowed revenge on [[KidAppealCharacter Bumblebee]] for (accidentally) sending him to prison, though he'd been trying to take Bee down for some time before. The Decepticon symbol his new form inexplicably has is basically there 'cause the toy has it.
* In ''WesternAnimation/{{Witch}}'',
Nerissa creates two additional Knights of Destruction as her minions, turning Matt (Will's boyfriend) and Mr. Huggins (Matt's pet dormouse) into Shagon and Khor, respectively. Most of the time, the girls aren't aware that Shagon and Khor are actually their friends turned into evil monsters.
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* [[Comicbook/SpiderMan Curt Conners]] is by all accounts a good man: devoted husband and father, brilliant scientist, and dedicated to helping amputees...by developing experimental lizard gene therapy that turns him into the Lizard.
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* ''WesternAnimation/TheBatman'': Police detective Ethan Bennett gets accidentally turned into Clayface by the Joker, and he goes back and forth between being a good or evil character throughout the series.


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* ''WesternAnimation/{{Witch}}'': In the cartoon version, Nerissa creates two additional Knights of Destruction as her minions, turning Matt (Will's boyfriend) and Mr. Huggins (Matt's pet dormouse) into Shagon and Khor, respectively. Most of the time, the girls aren't aware that Shagon and Khor are actually their friends turned into evil monsters.
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* MainCharacterFinalBoss: The main character becomes the final boss either of their own volition or as part of the main villain's machinations.
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* In ''WesternAnimation/StevenUniverseFuture,'' of all people, [[spoiler:''Steven himself'' undergoes through this during his mental breakdown in the episode "[[Recap/StevenUniverseFutureS1E18EverythingsFine Everything's Fine]]". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his [[PowerIncontinence uncontrollable powers]], corrupted him and turned him into a pink Kaiju-like monster. He gets better at the end of "[[Recap/StevenUniverseFutureS1E19IAmMyMonster I Am My Monster]]".]]

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* In ''WesternAnimation/StevenUniverseFuture,'' of all people, [[spoiler:''Steven himself'' undergoes through this suffers one of these during his mental breakdown in the episode "[[Recap/StevenUniverseFutureS1E18EverythingsFine Everything's Fine]]". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his [[PowerIncontinence uncontrollable powers]], corrupted him and turned him into a pink Kaiju-like monster. He gets better at the end of "[[Recap/StevenUniverseFutureS1E19IAmMyMonster I Am My Monster]]".]]
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* In ''WesternAnimation/StevenUniverseFuture,'' of all people, [[spoiler:Steven himself undergoes through this during his mental breakdown in the episode "Everything's Fine". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his uncontrollable powers, corrupted him and turned him into a pink Kaiju-like monster. He gets better at the end of "I Am My Monster".]]

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* In ''WesternAnimation/StevenUniverseFuture,'' of all people, [[spoiler:Steven himself [[spoiler:''Steven himself'' undergoes through this during his mental breakdown in the episode "Everything's Fine". "[[Recap/StevenUniverseFutureS1E18EverythingsFine Everything's Fine]]". His self-hatred, combined with his unchecked PTSD, feelings of purposelessness, and his [[PowerIncontinence uncontrollable powers, powers]], corrupted him and turned him into a pink Kaiju-like monster. He gets better at the end of "I "[[Recap/StevenUniverseFutureS1E19IAmMyMonster I Am My Monster".Monster]]".]]
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* ''VideoGame/Persona2: Eternal Punishment'' provides the page quote above. For context, Ulala, one of the main heroes, drunkenly invokes the JOKER Curse on Maya by calling her own phone number (which summons a serial killer to try to murder whoever the caller wishes) during a moment of weakness over her inferiority to Maya's success. Unfortunately, later in the game, the villains cause anyone who's called the number to turn into a [[MonsterClown JOKER]] themselves - Ulala is ''not'' immune to this, and Maya, Katsuya, and Baofu have to fight her to free her.
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* [[Manga/YuYuHakusho Urameshi Yusuke]] [[spoiler:pretends]] this (v.1) has happened when [[spoiler:he comes back from the dead the second time. Just to mess with the racist assholes from the Spirit World who'd been sent to vaporize his corpse to make sure he couldn't arise as a superpowered demon. The dub version ends his FaceHeelTurn speech with PSYCH! and in all versions he puts a shoe on his head and sticks his tongue out. Very funny.]]

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* [[Manga/YuYuHakusho In ''Manga/YuYuHakusho'', Urameshi Yusuke]] Yusuke [[spoiler:pretends]] this (v.1) has happened when [[spoiler:he comes back from the dead the second time. Just to mess with the racist assholes from the Spirit World who'd been sent to vaporize his corpse to make sure he couldn't arise as a superpowered demon. The dub version ends his FaceHeelTurn speech with PSYCH! and in all versions he puts a shoe on his head and sticks his tongue out. Very funny.]]
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* In ''LightNovel/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs'' this eventually happens to [[spoiler: the main character after he starts turning into one of the 17 Beasts. While still able to exert some control over his actions, it’s a losing battle, and he inevitably becomes the final antagonist of the series]].

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* In ''LightNovel/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs'' ''Literature/WorldEndWhatDoYouDoAtTheEndOfTheWorldAreYouBusyWillYouSaveUs'' this eventually happens to [[spoiler: the main character after he starts turning into one of the 17 Beasts. While still able to exert some control over his actions, it’s a losing battle, and he inevitably becomes the final antagonist of the series]].
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When the original personality is still there, but their allegiance has changed with their form.

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When the original personality is still there, but their allegiance and morality has changed been warped with their form.
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* In ''VideoGame/ShadowHearts'': From the New World, [[spoiler:Edna Capone]] suffers from this after being revived with the power of Malice.

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* In ''VideoGame/ShadowHearts'': From the New World, ''VideoGame/ShadowHeartsFromTheNewWorld'', [[spoiler:Edna Capone]] suffers from this after being revived with the power of Malice.
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* Series/{{Highlander}}: Immortals can be corrupted by absorbing to much evil from the quickenings of wicked immortals and in turn pass on that corruption in the form of a dark quickening. Duncan is only known immortal in the canon of the TV Show to overcome being turned by one.

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* Series/{{Highlander}}: ''Series/{{Highlander}}'': Immortals can be corrupted by absorbing to much evil from the quickenings of wicked immortals and in turn pass on that corruption in the form of a dark quickening. Duncan is only known immortal in the canon of the TV Show to overcome being turned by one.



* Jean-Luc Picard being turned into Locutus of Borg, in ''Series/StarTrekTheNextGeneration''.

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* Jean-Luc Picard being turned into Locutus of Borg, Borg in ''Series/StarTrekTheNextGeneration''.the ''Series/StarTrekTheNextGeneration'' episode(s) "[[Recap/StarTrekTheNextGenerationS3E26S4E1TheBestOfBothWorlds The Best of Both Worlds]]".
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** The whole Dark Side of the series is made of [[WithGreatPowerComesGreatInsanity 'insanity']] and its [[SuperPoweredEvilSide effects]].

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** The whole Dark Side of the series is made of [[WithGreatPowerComesGreatInsanity 'insanity']] 'madness']] and its [[SuperPoweredEvilSide effects]].
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For when the subject has their personality or allegiance changed by more "organic" means.

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For when the subject has their personality or allegiance changed by more "organic" means.
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** StockholmSyndrome \\

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** StockholmSyndrome UsefulNotes/StockholmSyndrome \\
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* In ''Manga/DemonSlayerKimetsuNoYaiba'', Zenitsu ''almost'' has this happen to him. He was once bitten by a spider which was to go on to mutate him into a mindless demonic human-spider hybrid and a minion of the Older Brother Spider Demon. He was saved by Shinobu and eventually had his shrunken limbs restored to normal. Later in the series, however, actual examples are shown, [[spoiler:first the Upper-1 of the Twelve Kizuki, Kokushibo, is revealed to be a former Demon Slayer of the 1500's, older twin of the legendary Yoriichi Tsugikuni, who betrayed the Corps out of immense jealousy, insecurities and fear of death; then Kaigaku, Zenitsu's former elder colleague in Thunder Breathing, lost a fight to that same Kokushibo and was offered the same path of betrayal, he takes it. In the end, the last tragedy is Tanjiro himself turning into a demon, however, he was forced into it, and everyone alive focused their efforts on curing him then and there before it became an irreversible situation, thankfully Tanjiro is brought back fast enough]].

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* In ''VideoGame/ResidentEvilOutbreak File #2'' the third series Tyrant helps the players at first (since it's been programmed to protect humans and destroy hunters). Then it gets damaged, loses its PowerLimiter, mutates even more and goes crazy.
** Also, if a player dies then they turn into a zombie (or a more powerful RoamingEnemy in one level).
* In ''VideoGame/ResidentEvilCodeVeronica'', Steve is infected with T-Veronica and attacks Claire until ThePowerOfLove returns him to normal (but he dies immediately after).
* Even as far back as the second game, Brad Vickers survives the first ''Resident Evil'' just to show up in ''2'' as an optional zombie encounter. ''3'' shows ''how'' he was zombified.

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* ''Franchise/ResidentEvil'':
**
In ''VideoGame/ResidentEvilOutbreak File #2'' the third series Tyrant helps the players at first (since it's been programmed to protect humans and destroy hunters). Then it gets damaged, loses its PowerLimiter, mutates even more and goes crazy.
** *** Also, if a player dies then they turn into a zombie (or a more powerful RoamingEnemy in one level).
* ** In ''VideoGame/ResidentEvilCodeVeronica'', Steve is infected with T-Veronica and attacks Claire until ThePowerOfLove returns him to normal (but he dies immediately after).
* ** Even as far back as the [[VideoGame/ResidentEvil2 second game, game]], Brad Vickers survives the first ''Resident Evil'' ''VideoGame/ResidentEvil1'' just to show up in ''2'' as an optional zombie encounter. ''3'' ''[[VideoGame/ResidentEvil3Nemesis 3]]'' shows ''how'' he was zombified.
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* Already teetering on the edge of being utterly mental, {{Tragic Hero}} Siegfried Schtauffen in the original [[VideoGame/SoulCalibur Soul Edge]] is completely consumed by the eponymous Evil Sword when he finally takes possession of it, turning him into the Soul Edge manifest; a rampaging demon-knight known as Nightmare.

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* Already teetering on the edge of being utterly mental, {{Tragic Hero}} Siegfried Schtauffen in the original [[VideoGame/SoulCalibur ''[[VideoGame/SoulCalibur Soul Edge]] Edge]]'' is completely consumed by the eponymous Evil Sword when he finally takes possession of it, turning him into the Soul Edge manifest; a rampaging demon-knight known as Nightmare.



* VideoGame/DragonQuest: Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].

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* VideoGame/DragonQuest: ''VideoGame/DragonQuest'': Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].
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* VideoGame/DragonQuest: Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once [[Paladin]]s who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].

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* VideoGame/DragonQuest: Togres from ''[[VideoGame/DragonQuestVII Dragon Quest VII]]'', [[AllThereInTheManual according its Dragon Quest X bestiary entry]], were once heroes who stole [[ShockAndAwe Kazapstrophe]] from the gods but were turned into monsters by them as punishment. Likewise from the [[VideoGame/DragonQuestX same game]], Zombie Paladins were once [[Paladin]]s Paladins who protected the people, but became minions of [[BigBad Jagonuba]] after they were betrayed by the [[UngratefulBastard very people they protected]].
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* Every single enemy bar the final boss in ''VideoGame/WarioLand 3'' turns out to be a human turned into a monster by the BigBad as revenge for sealing him away.

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* Every single enemy bar the final boss in ''VideoGame/WarioLand 3'' ''VideoGame/WarioLand3'' turns out to be a human turned into a monster by the BigBad as revenge for sealing him away.

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