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** ''WesternAnimation/LooneyTunes'':



*** "The Prize Pest": Porky wins a prize in a radio contest. Cue Daffy Duck inside a gift box being delivered to his door. Naturally, Daffy starts causing mayhem in Porky's house, which gets him kicked out of the place. In response, Daffy {{lampshade}}s this trope -- in the lawn, he concludes that he'll have to "use his Jekyll and Hyde routine on this one". He then proceeds to [[ExploitedTrope exploit]] it by scaring Porky into submission. You see, if you mistreat Daffy, he turns into this hideous, fanged duck monster. But if you treat him nicely, he can be the [[BlatantLies loveliest of pets]]. In truth, Daffy merely messes the feathers on his head and puts some fake fangs on his beak.** Depatie-Freleng Enterprises: "The Inspector" episode "Sicque! Sicque! Sicque!" where Sgt. Deux-Deux drinks the classic potion and becomes a monster. In "Pink Lightening" the same happens to The Pink Panther's car and "Watch The Birdie" is pretty much a remake of "Hyde and Go Tweet" with "The Dogfather" characters instead.

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*** "The Prize Pest": Porky wins a prize in a radio contest. Cue Daffy Duck inside a gift box being delivered to his door. Naturally, Daffy starts causing mayhem in Porky's house, which gets him kicked out of the place. In response, Daffy {{lampshade}}s this trope -- in the lawn, he concludes that he'll have to "use his Jekyll and Hyde routine on this one". He then proceeds to [[ExploitedTrope exploit]] it by scaring Porky into submission. You see, if you mistreat Daffy, he turns into this hideous, fanged duck monster. But if you treat him nicely, he can be the [[BlatantLies loveliest of pets]]. In truth, Daffy merely messes the feathers on his head and puts some fake fangs on his beak.beak.
** Depatie-Freleng Enterprises: "The Inspector" ''WesternAnimation/TheInspector'': In the episode "Sicque! Sicque! Sicque!" where , Sgt. Deux-Deux drinks the classic potion and becomes a monster. monster.
** ''WesternAnimation/ThePinkPanther'':
***
In "Pink Lightening" [[RecycledScript the same happens happens]] to The Pink Panther's old car and which, by the way, belonged to one Dr. Jekyll.
***
"Watch The Birdie" is pretty much a remake of "Hyde and Go Tweet" with "The Dogfather" characters instead.

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* It must have been Creator/FrizFreleng's favorite book, because he did three or four cartoons on the theme for Warner Bros., and a couple more at Depatie-Freleng Enterprises, specifically:
** ''WesternAnimation/LooneyTunes'': "Hyde and Hare" (with Bugs Bunny), "Dr. Jerkyl's Hide" (with Sylvester), and "WesternAnimation/HydeAndGoTweet" (Sylvester and Tweety).
** Depatie-Freleng Enterprises: "The Inspector" episode "Sicque! Sicque! Sicque!" where Sgt. Deux-Deux drinks the classic potion and becomes a monster. In "Pink Lightening" the same happens to The Pink Panther's car and "Watch The Birdie" is pretty much a remake of "Hyde and Go Tweet" with "The Dogfather" characters instead.

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* It must have been Creator/FrizFreleng's favorite book, because he did three or four cartoons on Creator/FrizFreleng was particularly fond of this trope, seeing the theme for Warner Bros., many cartoon installments he produced with this theme. And to different animation studios, to boot -- Creator/WarnerBros and Creator/DePatieFrelengEnterprises.
*** "The Case of the Stuttering Pig": Mr. Goodwill, the lawyer, [[ExploitedTrope exploits]] this trope to get rid of
a couple more at Depatie-Freleng Enterprises, specifically:
** ''WesternAnimation/LooneyTunes'':
group of piglets so he can appropriate the house they just inherited from their Uncle Solomon -- Goodwill is the next heir in line. He drinks two glasses of well-shaken [[LampshadeHanging Jekyll and Hyde juice]] to turn into a monster.
*** ''WesternAnimation/HydeAndGoTweet'': Dr. Jekyll creates a formula that turns him into the monstrous Mr. Hyde, EvilLaugh included. It's precisely in the bottle containing the formula that Tweety goes to hide from Sylvester, thus getting transformed into a deranged bird that's twice Sylvester's size. The cat, of course, has no idea Tweety is the monster, so when the latter changes back to normal, the former is still trying to eat him.
***
"Hyde and Hare" (with Hare": Bugs Bunny), Bunny convinces the man who always feeds him at the park to adopt him. The man, Dr. Jekyll, already verges on UncannyValley territory with his too-big head and small hands. However, when he drinks the red concoction he's prepared at his laboratory and that he's addicted to, he becomes a green, red-eyed monster with hairy limbs. Bugs Bunny doesn't realize Mr. Hyde's real identity until he transforms in front of him while trapped in a closet. Then Bugs goes to the lab and off-screen drinks the red concoction -- when he returns to the park, he slowly changes into a monster and scares the elderly without understanding why.
*** "The Impatient Patient": Daffy Duck goes to Dr. Jerkyll's to get cured of his severe case of hiccup. The place is outright scary but the doctor turns out to be a complete scaredy-cat. So, to successfully frighten the duck and cure him, Jerkyll concocts and drinks a formula to transform into Mr. Hyde. Not that Hyde is any less of a doofus.
***
"Dr. Jerkyl's Hide" (with Sylvester), Hide": Silvester hides in Dr. Jerkyl's laboratory while running away from the dogs Alfie and "WesternAnimation/HydeAndGoTweet" (Sylvester Chester. There, he mistakes a beaker full of a red, fizzy liquid with soda, so he drinks it to quench his thirst. A few seconds later and Tweety).
he's transformed into a strong, bigger monster cat. When Alfie, the largest dog, Silvester makes quick work of him twice. Meanwhile, Chester only gets to see Sylvester when he reverts back, so he never understands why he's boss is afraid of a cat. Later, Alfie causes the liquid to fall on a fly, who also kicks his ass.
*** "The Prize Pest": Porky wins a prize in a radio contest. Cue Daffy Duck inside a gift box being delivered to his door. Naturally, Daffy starts causing mayhem in Porky's house, which gets him kicked out of the place. In response, Daffy {{lampshade}}s this trope -- in the lawn, he concludes that he'll have to "use his Jekyll and Hyde routine on this one". He then proceeds to [[ExploitedTrope exploit]] it by scaring Porky into submission. You see, if you mistreat Daffy, he turns into this hideous, fanged duck monster. But if you treat him nicely, he can be the [[BlatantLies loveliest of pets]]. In truth, Daffy merely messes the feathers on his head and puts some fake fangs on his beak.
** Depatie-Freleng Enterprises: "The Inspector" episode "Sicque! Sicque! Sicque!" where Sgt. Deux-Deux drinks the classic potion and becomes a monster. In "Pink Lightening" the same happens to The Pink Panther's car and "Watch The Birdie" is pretty much a remake of "Hyde and Go Tweet" with "The Dogfather" characters instead.
Is there an issue? Send a MessageReason:
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* ''WesternAnimation/DextersLaboratory'': The episode "Monstrosi-Dee Dee" has Dee Dee consuming a contaminated apple and repeatedly turning into a monster and back. The episode is a ShoutOut to Friz Freleng's cartoons mentioned above.

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* ''WesternAnimation/DextersLaboratory'': The episode "Monstrosi-Dee Dee" has Dee Dee consuming a contaminated apple and repeatedly turning into a monster and back. The episode Dexter has no idea she is a ShoutOut the monster stalking his laboratory, so he follows her advice (when she's human) on where to Friz Freleng's cartoons mentioned above.hide.

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* ''WesternAnimation/TheRobonicStooges'': In the episode "Dr. Jekyll And Hide Curly", Dr. Jerkyll creates a formula, the Red Hot Atomic Pepper, to create Mr. Hyde counterparts on the backs of the Stooges' heads à la TwoBeingsOneBody. The purpose of the Hyde heads is to take over the Stooges so they quote unquote willingly go to Dr. Jerkyll's lair. Hilarity ensues.

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* ''WesternAnimation/TheRobonicStooges'': In the The episode "Dr. Jekyll And Hide Curly", Jerkyll and Hyde Curly" has Dr. Jerkyll creates a formula, the creating his Red Hot Atomic Pepper, to create Pepper while in prison. He dusts it all over himself and, as a result, an ugly, Mr. Hyde counterparts on Hyde-like head grows in the backs back of his head. With the Stooges' extra strength that the head provides, they both escape from jail and proceed to kidnap Curly. Jerkyll eventually [[spoiler: captures all three stooges and dusts his Pepper over them as well, with the same results. The heads à la TwoBeingsOneBody. The purpose of the Hyde heads is control their bodies (but not minds) to take over the Stooges so they quote unquote willingly go to Dr. make them do Jerkyll's lair. Hilarity ensues.bidding]]. Every application of the Pepper has the RunningGag of the person not realizing they just got a head on their nape, with the head answering:
--> That's what you think!
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* ''TheHuckleberryHoundShow'': PlayedForLaughs. In the episode "Picadilly Dilly", Huckleberry Hound is tasked with capturing the deranged criminal Picadilly Dilly, a pastiche of Mr. Hyde. The person behind the latter is Dr. Jikkle, who has become addicted to the serum that transforms him into Picadilly Dilly. Huckleberry, as laid back as he is, cannot recognize Picadilly even when the latter is running around him while giggling evilly.
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** ''WesternAnimation/DrJekyllAndMrMouse''.
** The episode "See Dr. Jackal and Hide" of ''WesternAnimation/TheTomAndJerryShow'', which is a reworking of ''Dr. Jekyll and Mr. Mouse''. In this instance, it's a human scientist who tests a growth serum he created on himself. Predictably, everything goes wrong and he transforms into a long-haired, monster that chases Tom and Jerry until the effects wear off.

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** ''WesternAnimation/DrJekyllAndMrMouse''.
''WesternAnimation/DrJekyllAndMrMouse'': Desperate to stop Jerry from drinking the milk he stole, Tom pours all sorts of poisons on the said milk. Instead of killing Jerry, it transforms him into an invulnerable super mouse with super strength. Unlike other cases of this trope, Jerry is aware of himself during his transformation and there's no trigger to set it off. That and the fact the one who creates the serum (aka Jekyll) is not the one suffering its effects.
** The episode "See Dr. Jackal and Hide" of ''WesternAnimation/TheTomAndJerryShow'', which is a reworking of ''Dr. Jekyll and Mr. Mouse''. In this instance, it's a human scientist who tests a growth serum he created on himself. Predictably, everything goes wrong and he transforms into a long-haired, monster that chases Tom and Jerry until the effects wear off. He doesn't remember a thing and randomly switches back to Hyde mode.

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* [[Manga/OnePiece Tony Tony Chopper]] creates this dynamic in himself in the fanfic ''Fanfic/ThisBites''. After doing research in Alabasta, Chopper created an enzyme to drastically increase his intelligence to gain the full potential of the Human-Human Fruit. Unfortunately, the increase in intelligence came with an equal ''decrease'' in morality and impulse control. Now Chopper often slips into a full on MadScientist all too eager to vivisect his own teammates to learn what he can ForScience. It normally takes a TapOnTheHead to force Chopper back into his normal mentality, though he has been training to overcome his inner Hyde himself.

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* [[Manga/OnePiece Tony Tony Chopper]] creates this dynamic in himself in the fanfic ''Fanfic/ThisBites''. After doing research in Alabasta, Chopper created an enzyme to drastically increase his intelligence to gain the full potential of the Human-Human Fruit. Unfortunately, the increase in intelligence came with an equal ''decrease'' in morality and impulse control. Now Chopper often slips into a full on full-on MadScientist all too eager to vivisect his own teammates to learn what he can ForScience. It normally takes a TapOnTheHead to force Chopper back into his normal mentality, though he has been training to overcome his inner Hyde himself.



[[folder:Films -- Animated]]

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[[folder:Films -- Animated]]Animation]]



* Creator/JamesRolfe's ''WebVideo/BoardJames'' review series had him play a mild-mannered board game reviewer closer to his normal personality compared to ''WebVideo/TheAngryVideoGameNerd,'' his more famous character. In one episode, they do a crossover which reveals AVGN is in fact Hyde to Board James' Jekyll, and his AVGN side takes over. [[spoiler:Later episodes reveal the dynamic is actually inverted. While AVGN is a foul-mouthed {{Manchild}}, he does manage to have softer, more sympathetic moments. Board James, on the other hand, is revealed to be an AxCrazy [[Franchise/{{Saw}} Jigsaw-esque]] murderer known as the Hangman Killer who tortures others using board games for amusement.]] This also gets a DramaticIrony nod in ''VideoGame/{{The Angry Video Game Nerd II ASSimilation}},'' [[spoiler:where AVGN, after fighting off Board James as a mini-boss, claims he was psycho and was glad he's not him.]]

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* Creator/JamesRolfe's ''WebVideo/BoardJames'' review series had him play a mild-mannered board game reviewer closer to his normal personality compared to ''WebVideo/TheAngryVideoGameNerd,'' his more famous character. In one episode, they do a crossover which that reveals AVGN is in fact Hyde to Board James' Jekyll, and his AVGN side takes over. [[spoiler:Later episodes reveal the dynamic is actually inverted. While AVGN is a foul-mouthed {{Manchild}}, he does manage to have softer, more sympathetic moments. Board James, on the other hand, is revealed to be an AxCrazy [[Franchise/{{Saw}} Jigsaw-esque]] murderer known as the Hangman Killer who tortures others using board games for amusement.]] This also gets a DramaticIrony nod in ''VideoGame/{{The Angry Video Game Nerd II ASSimilation}},'' [[spoiler:where AVGN, after fighting off Board James as a mini-boss, claims he was psycho and was glad he's not him.]]



* ''Franchise/{{Transformers}}'':
** The Autobot Punch adopted a Decepticon personality as Counter-Punch, so as to play a double agent. He has lost some sense of self-identity because the Counter-Punch personality takes over, leaving him with a sense that he's missed out on the past hour or so.
** It also happened in ''WesternAnimation/BeastMachines'', with Savage and Noble. Savage is a blind, insane, vicious dragon, while Noble is an intelligent and cunning [[{{Wolfman}} wolfbot]]. [[spoiler: Subverted, in that they're Megatron, playing their sympathies to get into position.]]
* Several times in ''WesternAnimation/JackieChanAdventures'' is Jackie split into a good and bad side, usually via the Tiger talisman. These two sides are the same person and represent the balance in all humans of a good and bad side. Ironically, this occurs in one episode in which Jade is performing in a play about Jekyll and Hyde. It's not really "good" and "bad" though so much as "moral pacifist" and "amoral badass":
-->'''Jade''' (pointing to amoral Jackie): You're evil! EVIL!\\
'''Uncle''': Not evil. Only misguided.
* Norman Osborn and the Goblin in ''WesternAnimation/SpiderManTheAnimatedSeries''; unlike most depictions, this version of Osborn was a decent guy (or at least trying to be one), while the Goblin was as homicidal as ever.
* Morph from ''WesternAnimation/XMenTheAnimatedSeries'', after coming BackFromTheDead, often wavered back and forth between his normal, "Jekyll" self and a semi-undead "Mr. Hyde" alter-ego who blamed the X-Men for leaving him behind on a failed mission. It turned out he was [[BrainwashedAndCrazy mind-controlled]] by the season's BigBad, but the effects didn't leave him for a good while afterward. At one point, he even hides out with a theater troop, where he performs "Jekyll and Hyde", using his [[VoluntaryShapeshifting shapeshifting]] powers to play both roles.
* The 1950 [[WesternAnimation/ClassicDisneyShorts Goofy cartoon]] ''WesternAnimation/MotorMania'' features Goofy as the mild-mannered, friendly Mr. Walker. However, whenever Mr. Walker gets into his car, he becomes the ill-tempered, violent, and [[DrivesLikeCrazy reckless Mr. Wheeler.]]
* The second SuperheroEpisode of ''WesternAnimation/JimmyTwoShoes'', "The Terrific Trio", featured a large, green monster that constantly attacked Lucius out of spite. It was eventually revealed to be Samy, who was constantly transforming thanks to one of [[MadScientist Heloise's]] potions that magnified a person's inner rage.
* ''WesternAnimation/MaryShelleysFrankenhole'' has ''the'' Jekyll and Hyde, whose serum causes Creator/JohnBelushi to turn into [[Creator/JamesBelushi Jim Belushi]]. Victor [[DeconstructedTrope also ridicules him]] for being his own monster.



* ''WesternAnimation/AtomicBetty'': Minimus' two personalities. The book was even mentioned in the episode where he got stuck on "Hyde" mode.
* ''WesternAnimation/BatmanTheAnimatedSeries'' added another variation to this in Two-Face in the final season - [[spoiler:he'd established a ''third'' personality called "The Judge", who targeted Gotham's costumed villains, including Two-Face himself, who would GoMadFromTheRevelation.]]



** The episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker. Beetlejuice is turned into a handsome and germophobic version of himself, which wears off the instant he starts bathing, and the end of the episode has Mayor Maynot become a hippie who's happy to let Beetlejuice off the hook for once.

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** The episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker. Beetlejuice is turned into a handsome and germophobic version of himself, which wears off the instant he starts bathing, and at the end of the episode has Mayor Maynot become a hippie who's happy to let Beetlejuice off the hook for once.



* ''WesternAnimation/TheRobonicStooges'': "Dr. Jekyll And Hide Curly" has Dr. Jekyll's formula creating a Mr. Hyde on the ''back'' of his head only. He captures the Stooges and creates Hydes on the back of their heads that makes them imprison themselves.
* ''WesternAnimation/BatmanTheAnimatedSeries'' added another variation to this in Two-Face in the final season - [[spoiler:he'd established a ''third'' personality called "The Judge", who targeted Gotham's costumed villains, including Two-Face himself, who would GoMadFromTheRevelation.]]

to:

* ''WesternAnimation/TheRobonicStooges'': "Dr. Jekyll And Hide Curly" has Dr. Jekyll's formula creating a In the ''WesternAnimation/CountDuckula'' episode "Doctor Goosewing and Mr. Hyde on the ''back'' of his head only. He captures the Stooges and creates Hydes on the back of their heads Duck", Von Goosewing invents a potion that makes them imprison themselves.
reverses everyone's personality. He and Duckula become "wicious wampires", Igor becomes happy and loving and Nanny becomes a brainbox.
* ''WesternAnimation/BatmanTheAnimatedSeries'' added another variation ''WesternAnimation/DextersLaboratory'': The episode "Monstrosi-Dee Dee" has Dee Dee consuming a contaminated apple and repeatedly turning into a monster and back. The episode is a ShoutOut to Friz Freleng's cartoons mentioned above.
* ''WesternAnimation/TheFairlyOddParents'' episode "Nega-Timmy" had Timmy Turner wish that he did the opposite of what his parents told him to do. The way
this in Two-Face in wish ends up backfiring is that Mr. Turner tells his son to be good, which transforms Timmy into a fanged, top hat-wearing EnfantTerrible who attempts to use a laser to start a chain of events that will lead to the final season - [[spoiler:he'd established a ''third'' personality called "The Judge", who targeted Gotham's costumed villains, including Two-Face himself, who would GoMadFromTheRevelation.]]destruction of Dimmsdale. Timmy ultimately returns to normal after Mr. Turner tells Timmy to be as evil as he can be in response to Nega-Timmy swaying his dad to go along with his plan by promising that one of the results will be [[SitcomArchnemesis Dinkleburg]]'s house getting obliterated.



* ''WesternAnimation/YogisSpaceRace'': Captain Good and Phantom Phink; actually a subversion, since "Captain Good" was a disguise to begin with.[[note]]He only did "good deeds" in order to keep up the charade.[[/note]] Also parodied in one of the [[RunningGag Space Race biography]] segments which describe Phantom Phink[[note]]An original character created for this series.[[/note]] as Jekyll's descendant. [[IdenticalGrandson With "Dr. Jekyll" looking like "Captain Good" and "Mr. Hyde" looking like "Phantom Phink"]].
* ''WesternAnimation/ThePerilsOfPenelopePitstop'': The Hooded Claw rented a house from Jekyll and Hyde as part of a plan to capture Penelope in "London Town Treachery", inviting Penelope and the Ant Hill Mob for tea while disguised as the Earl of Krumpet. After realizing there was no tea there, he improvised with some random ingredients. He planned to have the Bully Brothers capture Penelope while he distracted the Ant Hill Mob with the tea. However, the tea turned them into seven Mr. Hydes and they captured Penelope. To get their SentientVehicle Chugaboom to cooperate, they gave him some of the "tea" and he also became a Mr. Hyde.
* ''WesternAnimation/AtomicBetty'': Minimus' two personalities. The book was even mentioned in the episode where he got stuck on "Hyde" mode.
* In the ''WesternAnimation/CountDuckula'' episode "Doctor Goosewing and Mr. Duck", Von Goosewing invents a potion that reverses everyone's personality. He and Duckula become "wicious wampires", Igor becomes happy and loving and Nanny becomes a brainbox.
* The ''WesternAnimation/DextersLaboratory'' episode "Monstrosi-Dee Dee" has Dee Dee consuming a contaminated apple and repeatedly turning into a monster and back. The episode is a ShoutOut to Friz Freleng's cartoons mentioned above.
* ''WesternAnimation/ScoobyDooWhereAreYou'': "Nowhere To Hyde" (season 2, episode 1) mixes this with the standard ScoobyDooHoax. A diamond necklace is stolen by a figure people see is the Ghost of Hyde. The gang (after circumstances from confronting Hyde) follow him to a house in the woods where they meet Dr. Jekyll, who says he's the ghost of Hyde after attempting to mix and test a vitamin formula. The standard investigations and chases ensue and after Hyde is captured, it turns out the Hyde ''was'' Dr. Jekyll in a mask who tried to frame his housekeeper for the crime.
* The ''WesternAnimation/StaticShock'' episode "Tantrum" had Virgil Hawkins/Static's classmate Thomas Kim transform into a purple behemoth whenever he got angry. Static even compares the transformation to Jekyll and Hyde.
* The eponymous character of ''WesternAnimation/{{Kaeloo}}'', who is normally a [[NiceGirl cute, gentle]] frog, transforms into a [[HulkingOut huge, buffed]], sadistic toad whenever she gets angry. Some episodes imply that she knows what she's doing, but others imply that she has no control over this.
-->'''Kaeloo:''' What did I do this time?
* The old ''WesternAnimation/TomAndJerry'' cartoon short, ''WesternAnimation/DrJekyllAndMrMouse''.
* ''WesternAnimation/TheRealGhostbusters'' episode "The Two Faces of Slimer" had a leak in the Containment Unit unleash some ectoplasmic energy that infected Slimer and caused him to transform into a larger, uglier, and more vicious ghost (dubbed "Big Green" by the Ghostbusters) whenever he went to sleep.
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' has Princess Luna (Jekyll) and Nightmare Moon (Hyde).
* One of the monster animals in ''WesternAnimation/MonsterFarm'' was Dr. Woolly, a meek and bespectacled sheep who mutated into a deranged brute named Mr. Ewwe whenever he got wet (getting wet again changes him back).



* ''WesternAnimation/TheFairlyOddParents'' episode "Nega-Timmy" had Timmy Turner wish that he did the opposite of what his parents told him to do. The way this wish ends up backfiring is that Mr. Turner tells his son to be good, which transforms Timmy into a fanged, top hat-wearing EnfantTerrible who attempts to use a laser to start a chain of events that will lead to the destruction of Dimmsdale. Timmy ultimately returns to normal after Mr. Turner tells Timmy to be as evil as he can be in response to Nega-Timmy swaying his dad to go along with his plan by promising that one of the results will be [[SitcomArchnemesis Dinkleburg]]'s house getting obliterated.

to:

* ''WesternAnimation/TheFairlyOddParents'' Several times in ''WesternAnimation/JackieChanAdventures'' is Jackie split into a good and bad side, usually via the Tiger talisman. These two sides are the same person and represent the balance in all humans of a good and bad side. Ironically, this occurs in one episode "Nega-Timmy" had Timmy Turner wish in which Jade is performing in a play about Jekyll and Hyde. It's not really "good" and "bad" though so much as "moral pacifist" and "amoral badass":
-->'''Jade''' (pointing to amoral Jackie): You're evil! EVIL!\\
'''Uncle''': Not evil. Only misguided.
* The second SuperheroEpisode of ''WesternAnimation/JimmyTwoShoes'', "The Terrific Trio", featured a large, green monster
that he did the opposite constantly attacked Lucius out of what his parents told him to do. The way this wish ends up backfiring is that Mr. Turner tells his son spite. It was eventually revealed to be good, which Samy, who was constantly transforming thanks to one of [[MadScientist Heloise's]] potions that magnified a person's inner rage.
* ''WesternAnimation/{{Kaeloo}}'': The eponymous character, who is normally a [[NiceGirl cute, gentle]] frog,
transforms Timmy into a fanged, top hat-wearing EnfantTerrible who attempts to use a laser to start a chain of events [[HulkingOut huge, buffed]], sadistic toad whenever she gets angry. Some episodes imply that will lead she knows what she's doing, but others imply that she has no control over this.
-->'''Kaeloo:''' What did I do this time?
* ''WesternAnimation/MaryShelleysFrankenhole'' has ''the'' Jekyll and Hyde, whose serum causes Creator/JohnBelushi
to turn into [[Creator/JamesBelushi Jim Belushi]]. Victor [[DeconstructedTrope also ridicules him]] for being his own monster.
* ''WesternAnimation/MonsterFarm'': One of
the destruction monster animals in is Dr. Woolly, a meek and bespectacled sheep who mutates into a deranged brute named Mr. Ewwe whenever he gets wet (getting wet again changes him back).
* ''WesternAnimation/MotorMania'': It features Goofy as the mild-mannered, friendly Mr. Walker. However, whenever Mr. Walker gets into his car, he becomes the ill-tempered, violent, and [[DrivesLikeCrazy reckless Mr. Wheeler.]]
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'': Princess Luna as Jekyll and Nightmare Moon as Hyde.
* ''WesternAnimation/ThePerilsOfPenelopePitstop'': The Hooded Claw rented a house from Jekyll and Hyde as part
of Dimmsdale. Timmy ultimately returns a plan to normal capture Penelope in "London Town Treachery", inviting Penelope and the Ant Hill Mob for tea while disguised as the Earl of Krumpet. After realizing there was no tea there, he improvised with some random ingredients. He planned to have the Bully Brothers capture Penelope while he distracted the Ant Hill Mob with the tea. However, the tea turned them into seven Mr. Hydes and they captured Penelope. To get their SentientVehicle Chugaboom to cooperate, they gave him some of the "tea" and he also became a Mr. Hyde.
* ''WesternAnimation/TheRealGhostbusters'' episode "The Two Faces of Slimer" had a leak in the Containment Unit unleash some ectoplasmic energy that infected Slimer and caused him to transform into a larger, uglier, and more vicious ghost (dubbed "Big Green" by the Ghostbusters) whenever he went to sleep.
* ''WesternAnimation/TheRobonicStooges'': In the episode "Dr. Jekyll And Hide Curly", Dr. Jerkyll creates a formula, the Red Hot Atomic Pepper, to create Mr. Hyde counterparts on the backs of the Stooges' heads à la TwoBeingsOneBody. The purpose of the Hyde heads is to take over the Stooges so they quote unquote willingly go to Dr. Jerkyll's lair. Hilarity ensues.
* ''WesternAnimation/ScoobyDooWhereAreYou'': "Nowhere To Hyde" (season 2, episode 1) mixes this with the standard ScoobyDooHoax. A diamond necklace is stolen by a figure people see is the Ghost of Hyde. The gang (after circumstances from confronting Hyde) follow him to a house in the woods where they meet Dr. Jekyll, who says he's the ghost of Hyde
after Mr. Turner tells Timmy attempting to mix and test a vitamin formula. The standard investigations and chases ensue and after Hyde is captured, it turns out the Hyde ''was'' Dr. Jekyll in a mask who tried to frame his housekeeper for the crime.
* Norman Osborn and the Goblin in ''WesternAnimation/SpiderManTheAnimatedSeries''; unlike most depictions, this version of Osborn was a decent guy (or at least trying
to be one), while the Goblin was as evil homicidal as ever.
* The ''WesternAnimation/StaticShock'' episode "Tantrum" had Virgil Hawkins/Static's classmate Thomas Kim transform into a purple behemoth whenever
he can be in response got angry. Static even compares the transformation to Nega-Timmy swaying his dad Jekyll and Hyde.
* ''WesternAnimation/TomAndJerry'':
** ''WesternAnimation/DrJekyllAndMrMouse''.
** The episode "See Dr. Jackal and Hide" of ''WesternAnimation/TheTomAndJerryShow'', which is a reworking of ''Dr. Jekyll and Mr. Mouse''. In this instance, it's a human scientist who tests a growth serum he created on himself. Predictably, everything goes wrong and he transforms into a long-haired, monster that chases Tom and Jerry until the effects wear off.
* ''Franchise/{{Transformers}}'':
** The Autobot Punch adopted a Decepticon personality as Counter-Punch, so as
to go along play a double agent. He has lost some sense of self-identity because the Counter-Punch personality takes over, leaving him with his plan by promising a sense that he's missed out on the past hour or so.
** It also happened in ''WesternAnimation/BeastMachines'', with Savage and Noble. Savage is a blind, insane, vicious dragon, while Noble is an intelligent and cunning [[{{Wolfman}} wolfbot]]. [[spoiler: Subverted, in that they're Megatron, playing their sympathies to get into position.]]
* Morph from ''WesternAnimation/XMenTheAnimatedSeries'', after coming BackFromTheDead, often wavered back and forth between his normal, "Jekyll" self and a semi-undead "Mr. Hyde" alter-ego who blamed the X-Men for leaving him behind on a failed mission. It turned out he was [[BrainwashedAndCrazy mind-controlled]] by the season's BigBad, but the effects didn't leave him for a good while afterward. At one point, he even hides out with a theater troop, where he performs "Jekyll and Hyde", using his [[VoluntaryShapeshifting shapeshifting]] powers to play both roles.
* ''WesternAnimation/YogisSpaceRace'': Captain Good and Phantom Phink; actually a subversion, since "Captain Good" was a disguise to begin with.[[note]]He only did "good deeds" in order to keep up the charade.[[/note]] Also parodied in
one of the results will be [[SitcomArchnemesis Dinkleburg]]'s house getting obliterated.[[RunningGag Space Race biography]] segments which describe Phantom Phink[[note]]An original character created for this series.[[/note]] as Jekyll's descendant. [[IdenticalGrandson With "Dr. Jekyll" looking like "Captain Good" and "Mr. Hyde" looking like "Phantom Phink"]].

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The trope name comes, of course, from ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', by Creator/RobertLouisStevenson. The dual nature of Jekyll was actually originally a TwistEnding in the case of that story, but the book became famous and [[ItWasHisSled now it no longer surprises anyone]]. Most adaptations of the work focus on the dichotomy from the start. Other occurrences of the trope may still manage to surprise, if they’re well done.

The real life example of [[http://en.wikipedia.org/wiki/Deacon_Brodie Deacon Brodie]] (cabinet-making pillar of the church by day, burglar by night) is said to have inspired Stevenson, as did the story of [[https://en.wikipedia.org/wiki/Horace_Wells Horace Wells]], a pioneer of medical anesthetics. While researching chloroform by [[ProfessorGuineaPig testing various dosages on himself]], Wells unknowingly built up a dangerous level of the drug in his system, and ultimately attacked two prostitutes with sulfuric acid in a state of intoxicated paranoia. He then committed suicide after sobering up and learning what he had done.

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The trope name comes, of course, from ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'', by Creator/RobertLouisStevenson. The dual nature of Jekyll was actually originally a TwistEnding in the case of that story, but the book became famous and [[ItWasHisSled now it no longer surprises anyone]]. Most adaptations of the work focus on the dichotomy from the start. Other occurrences of the trope may still manage to surprise, surprise if they’re well done.

The real life real-life example of [[http://en.wikipedia.org/wiki/Deacon_Brodie Deacon Brodie]] (cabinet-making pillar of the church by day, burglar by night) is said to have inspired Stevenson, as did the story of [[https://en.wikipedia.org/wiki/Horace_Wells Horace Wells]], a pioneer of medical anesthetics. While researching chloroform by [[ProfessorGuineaPig testing various dosages on himself]], Wells unknowingly built up a dangerous level of the drug in his system, and ultimately attacked two prostitutes with sulfuric acid in a state of intoxicated paranoia. He then committed suicide after sobering up and learning what he had done.


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See HydeAndSeek for when it's PlayedForLaughs.
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Updating Link


* Bruce Banner and his more famous dark side ComicBook/IncredibleHulk. This has been played with many times over the years, with Hulk varying from a brutal monster to an innocent savage. For a while between ''ComicBook/WorldWarHulk'' and ''Hulk: Agent of S.H.I.E.L.D.'', Banner was portrayed as ''Hulk's'' dark side, since [[spoiler:unlike Hulk, he'd actually killed someone]]. And in the ''ComicBook/{{Marvel 1602}}'' {{Elseworld}}, David Banner gets transformed into the Incredible Hulk. Lord Banner works as an enforcer for [[UsefulNotes/TheHouseOfStuart James VI of Scotland and I of England]], and is evil, sadistic and altogether not a nice bloke at all. Follow-ups reveal that the Hulk, on the other hand, is noble and intelligent. (And his influence eventually redeems Banner.)

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* ''ComicBook/TheIncredibleHulk'': Bruce Banner and his more famous dark side ComicBook/IncredibleHulk.the Hulk. This has been played with many times over the years, with Hulk varying from a brutal monster to an innocent savage. For a while between ''ComicBook/WorldWarHulk'' and ''Hulk: Agent of S.H.I.E.L.D.'', ''ComicBook/IndestructibleHulk'', Banner was portrayed as ''Hulk's'' dark side, since [[spoiler:unlike Hulk, he'd actually killed someone]]. And in the ''ComicBook/{{Marvel 1602}}'' ''ComicBook/Marvel1602'' {{Elseworld}}, David Banner gets transformed into the Incredible Hulk. Lord Banner works as an enforcer for [[UsefulNotes/TheHouseOfStuart James VI of Scotland and I of England]], and is evil, sadistic and altogether not a nice bloke at all. Follow-ups reveal that the Hulk, on the other hand, is noble and intelligent. (And his influence eventually redeems Banner.)
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* Wiki/TVTropes: SugarWiki/SugarWiki and DarthWiki/DarthWiki.

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* Wiki/TVTropes: Website/TVTropes: SugarWiki/SugarWiki and DarthWiki/DarthWiki.
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[[folder:Film -- Animated]]

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[[folder:Film [[folder:Films -- Animated]]



[[folder:Film -- Live-Action]]

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[[folder:Film [[folder:Films -- Live-Action]]
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Knife Nut is now a disambiguation.


* ''LetsPlay/VenturianTale'': This or [[DemonicPossession demonic possession]] appears to be the case with [[OccultDetective Johnny Ghost]] and [[KnifeNut Jimmy]] [[SerialKiller Casket]].

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* ''LetsPlay/VenturianTale'': This or [[DemonicPossession demonic possession]] appears to be the case with [[OccultDetective Johnny Ghost]] and [[KnifeNut Jimmy]] [[SerialKiller Jimmy Casket]].
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* ''VideoGame/BatmanArkhamKnight'': Harley Quinn's DLC story reveals her insanity to be this, with Harley Quinn being haunted by the voice of Dr. Harleen Quinzel. [[HelplessGoodSide Harleen has no power over Harley]], and is trying to get Harley to give up on her ramages and return to their normal life. Harley doesn't want to listen.
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[[folder:Comic Strips]]
* In ''ComicStrip/ScaryGary'', Dr. Jekyll is Leopold’s doctor. As Jekyll he is a normal looking man, but when he turns into Hyde, he turns roughly 8 feet tall and green, gains a somewhat disfigured face and disheveled hair, has a much more threatening demeanor, and just makes strange grunting sounds instead of talking.
[[/folder]]
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Up To Eleven is a defunct trope


* In ''WebAnimation/InanimateInsanity'' we have Yin-Yang, who takes this trope UpToEleven, in which the sides go back and forth fighting each other ''constantly''.

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* In ''WebAnimation/InanimateInsanity'' we have Yin-Yang, who takes this trope UpToEleven, in which the sides go back and forth fighting each other ''constantly''.
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* ''Series/MoonKnight2022'': From the start of the series, Marc Spector (and his secret identity, Moon Knight) and Steven Grant (and ''his'' secret identity, Mr. Knight) are shown as alternate personalities of someone with raging DID. (Initially, Marc knows about Steven, but not vice-versa.) Neither is technically a dark "Hyde", though; Marc is fully capable of competent violence, unlike the mild-mannered pacifist Steven, but retains a working sense of morality. However, it becomes increasingly clear through the series that there may be a third persona. This is eventually revealed to be [[spoiler:the ruthlessly violent Jake Lockley, who emerges when even Marc can't handle a threat and usually solves it by killing everyone within reach]].

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Alphabetized the Live-Action TV section.


* ''Series/Mouse2021'' plays with this. After a BrainTransplant Ba-reum ends up with part of Yo-han's brain. All the evidence suggests Yo-han was a serial killer, so when Ba-reum starts having flashbacks to murders he assumes Yo-han's personality is still alive in his brain. [[spoiler: Actually Ba-reum was the killer and Yo-han was innocent, so Ba-reum's original personality is the "Hyde" and Yo-han is the "Jekyll".]]

to:

* ''Series/Mouse2021'' plays with this. After a BrainTransplant Ba-reum ends up with part of Yo-han's brain. All the evidence suggests Yo-han ''Series/AceLightning'' has Random Virus, who has two personalities, good and evil, signified by his cyborg eye being green or red, respectively. He doesn't seem to have much control over whether he's good or evil, although Ace managed to turn him good temporarily by reminding him that he was a serial killer, so when Ba-reum starts having flashbacks to murders he assumes Yo-han's personality is still alive in his brain. [[spoiler: Actually Ba-reum was the killer Lightning Knight, and Yo-han was innocent, so Ba-reum's original personality is the "Hyde" and Yo-han is the "Jekyll".]]therefore a 'good guy'.



* Scorpius's suicidal program inside Crichton's head in ''Series/{{Farscape}}''.
* ''Franchise/StarTrek'':
** A brainwashed Geordi is used as an assassin on ''Series/StarTrekTheNextGeneration''.
** One episode of ''Series/StarTrekVoyager'' has [[spoiler: the Doctor]] develop a villainous split personality which he is unaware of as a result of [[spoiler: making some unwise adjustments to his programming]].
** ''Series/StarTrekTheOriginalSeries'' has "The Enemy Within", where a transporter malfunction splits Kirk's good and evil sides.
* ''{{Series/Jekyll}}'' plays around with the dichotomy. For the first half of the series Jackman ruins his life trying to minimize the damage Hyde could cause, particularly to his own family. Although Hyde is meant to be the most intelligent creature on the planet, his immature mind and Jackman's own substantial intelligence and careful planning allow Jackman to keep a tight hold on Hyde's actions.
* Niki and Jessica from ''[[{{Series.Heroes}} Heroes]]''.
* Season 6 of ''Series/{{Dexter}}'' has [[spoiler:Travis and Professor Gellar]] turning out to be just one person, they even try to Sixth Sense the twist for nine episodes. It was painfully obvious.

to:

* Scorpius's suicidal program inside Crichton's head in ''Series/{{Farscape}}''.
* ''Franchise/StarTrek'':
** A brainwashed Geordi is used as an assassin on ''Series/StarTrekTheNextGeneration''.
** One episode of ''Series/StarTrekVoyager'' has [[spoiler: the Doctor]] develop a villainous split personality which he is unaware of as a result of [[spoiler: making some unwise adjustments to his programming]].
** ''Series/StarTrekTheOriginalSeries'' has "The Enemy Within", where a transporter malfunction splits Kirk's good and evil sides.
* ''{{Series/Jekyll}}'' plays around
On ''Series/TheBigBangTheory'', after Penny wakes up with the dichotomy. For the first half of the series Jackman ruins his life trying Raj, she refers to minimize the damage Hyde could cause, particularly to his own family. Although Hyde is meant to be the most intelligent creature on the planet, his immature mind herself as Dr. Jekyll and Jackman's own substantial intelligence and careful planning allow Jackman to keep a tight hold on Hyde's actions.
Miss Whore.
* Niki and Jessica from ''[[{{Series.Heroes}} Heroes]]''.
* Season 6 of ''Series/{{Dexter}}'' has [[spoiler:Travis and Professor Gellar]] turning out to be just one person, they even try to Sixth Sense the twist for nine episodes. It was
Playing this trope painfully obvious.straight is Darkstrike from ''Series/BirdsOfPrey2002'': he's a vigilante hunting the Creeper, the SerialKiller who killed his girlfriend.



* ''Series/JuliaJekyllAndHarrietHyde'' had the main character Julia Jekyll turn into a hairy monster called Harriet Hyde uncontrollably.
* A show called ''Series/MyOwnWorstEnemy'' features a man leading a double life. His normal side is Henry and his alternate ego (that he doesn't know about) is the spy Edward, which is most likely an allusion to the original Dr. Henry Jekyll and Edward Hyde. Reverses the usual Jekyll/Hyde dynamic in that Edward is the original personality; Henry is a construct. While Edward is the edgier of the two personalities, he's not actually evil.
* ''Series/AceLightning'' has Random Virus, who has two personalities, good and evil, signified by his cyborg eye being green or red, respectively. He doesn't seem to have much control over whether he's good or evil, although Ace managed to turn him good temporarily by reminding him that he was a Lightning Knight, and therefore a 'good guy'.
* Playing this trope painfully straight is Darkstrike from ''Series/BirdsOfPrey2002'': he's a vigilante hunting the Creeper, the SerialKiller who killed his girlfriend.
* ''Series/WhereInTimeIsCarmenSandiego'' had a girl named Jacqueline Hyde, who jumped from sweet, innocent schoolgirl to raving, snarling harpy at the drop of a hat.
* ''Series/{{Smallville}}'':
** Davis Bloome[=/=]Doomsday.
** Before that, when Clark tried to explain himself to Chloe about not being himself lately (Lionel Luthor had swapped bodies with him), she stated that people sometimes act as Jekyll and then as Hyde but are the same after all.
* Adam Worth from ''Series/{{Sanctuary}}'' is said to be the in-universe explanation for the novel. Neither personality is particularly stronger, but unlike most examples, both sides work in tandem.
* ''Series/{{Supernatural}}'': Kind-and-gentle human Sammy, arrogant-and-violent demonic Sammy. And then there is soulless robo Sammy...

to:

* ''Series/JuliaJekyllAndHarrietHyde'' had Season 6 of ''Series/{{Dexter}}'' has [[spoiler:Travis and Professor Gellar]] turning out to be just one person, they even try to Sixth Sense the twist for nine episodes. It was painfully obvious.
* The
main hook of ''Do No Harm'': The title character Julia Jekyll turn into a hairy monster called Harriet Hyde uncontrollably.
* A show called ''Series/MyOwnWorstEnemy'' features a man leading a double life. His normal side
is Henry and his alternate ego (that he doesn't know about) is the spy Edward, which is most likely an allusion to the original Dr. Henry Jekyll and Edward Hyde. Reverses the usual Jekyll/Hyde dynamic in that Edward is the original personality; Henry is a construct. While Edward is the edgier of the two personalities, he's not actually evil.
* ''Series/AceLightning'' has Random Virus,
ethical doctor who has two personalities, good and evil, signified by his cyborg eye being green or red, respectively. He doesn't seem switches to have much control over whether he's good or evil, although Ace managed to turn him good temporarily by reminding him that he was a Lightning Knight, and therefore a 'good guy'.
* Playing this trope painfully straight is Darkstrike from ''Series/BirdsOfPrey2002'': he's a vigilante hunting the Creeper, the SerialKiller who killed his girlfriend.
* ''Series/WhereInTimeIsCarmenSandiego'' had a girl named Jacqueline Hyde, who jumped from sweet, innocent schoolgirl to raving, snarling harpy at the drop of a hat.
* ''Series/{{Smallville}}'':
** Davis Bloome[=/=]Doomsday.
** Before that, when Clark tried to explain himself to Chloe about not being himself lately (Lionel Luthor had swapped bodies with him), she stated that people sometimes act as Jekyll and then as Hyde but are the same after all.
* Adam Worth from ''Series/{{Sanctuary}}'' is said to be the in-universe explanation for the novel. Neither
malevolent second personality is particularly stronger, but unlike most examples, both sides work in tandem.
* ''Series/{{Supernatural}}'': Kind-and-gentle human Sammy, arrogant-and-violent demonic Sammy. And
at 8:25 pm each night and then there is soulless robo Sammy...reverts back at 8:25 am the following morning. After keeping this personality sedated with drugs for years, one day he finds that his body has become immune to them... Unleashing the other personalty, now bent on destroying his life. [[spoiler: [[SubvertedTrope Subverted]] in the series finale when it was [[TheReveal revealed]] that the benevolent personality was in fact the actual alter while the malevolent one was the original]].



* Mesogog and Anton Mercer from ''Series/PowerRangersDinoThunder''. Eventually Mesogog splits himself off from Mercer because he gets fed up with sharing. It frees the Rangers to not hold back against him, but he becomes even more effective due to being able to act more often and not just when he surfaces.
* A similar example is the villains [[TheChessmaster Heckyl]] and [[TheBrute Snide]] from ''Series/PowerRangersDinoCharge''. Played with, however, in that both personalities are firmly evil, just preferring different methods and disdaining the other's. Towards the end, Heckyl has a HeelFaceTurn, and Snide uses some tech to [[LiteralSplitPersonality completely separate them]].
* ''Series/TheVampireDiaries'':
** Stefan Salvatore. He has one side of his personality which is kind, caring, empathetic and compassionate and heroic ("Jekyll", Hero!Stefan) and another side of his personality which is sociopathic, crazy, addictive, cold and ruthless ("Hyde", Ripper!Stefan)
** Alaric Saltzman is a better example. Normally a good-hearted vampire hunter, he develops a serial killer Hyde persona from dying too often.
* The main hook of ''Do No Harm'': The title character is an ethical doctor who switches to a malevolent second personality at 8:25 pm each night and then reverts back at 8:25 am the following morning. After keeping this personality sedated with drugs for years, one day he finds that his body has become immune to them... Unleashing the other personalty, now bent on destroying his life. [[spoiler: [[SubvertedTrope Subverted]] in the series finale when it was [[TheReveal revealed]] that the benevolent personality was in fact the actual alter while the malevolent one was the original]].
* On ''Series/TheBigBangTheory'', after Penny wakes up with Raj, she refers to herself as Dr. Jekyll and Miss Whore.



* Scorpius's suicidal program inside Crichton's head in ''Series/{{Farscape}}''.
* In the original live-action series of ''[[WesternAnimation/FilmationsGhostbusters The Ghost Busters]]'', the ghost of Dr. Jekyll is one of the ghosts the Busters deal with as he materializes in the castle trying to cure himself of Hyde. Interestingly, Hyde is rendered as a separate entity from Jekyll, taking the form of an obnoxious man in a caveman outfit.
* Niki and Jessica from ''[[{{Series.Heroes}} Heroes]]''.



* ''{{Series/Jekyll}}'' plays around with the dichotomy. For the first half of the series Jackman ruins his life trying to minimize the damage Hyde could cause, particularly to his own family. Although Hyde is meant to be the most intelligent creature on the planet, his immature mind and Jackman's own substantial intelligence and careful planning allow Jackman to keep a tight hold on Hyde's actions.



* ''Series/JuliaJekyllAndHarrietHyde'' had the main character Julia Jekyll turn into a hairy monster called Harriet Hyde uncontrollably.
* ''Franchise/KamenRider'':
** ''Series/KamenRiderDenO'' effectively has ''four'' Hydes, sometimes even five, courtesy of the Imagin that live on his time-traveling train and need to possess his body in order to interact with the outside world. Each one gives Ryotaro a radically different personality and appearance whenever they take control, although they're all played by the same actor. They're also all heroes, albeit sometimes of questionable effectiveness.
** ''Series/KamenRiderFourze'': The Cygnus Zodiarts develops a split personality upon using his Switch for the first time, his meek cosplay otaku persona suppressed by a vain DarkMessiah. The Gemini Switch has a similar effect.
** ''Series/KamenRiderWizard'': Wiseman, leader of the Phantoms, and the White Wizard appear to have this relationship. It's subverted when it's revealed that the Wizard was always in complete control and was simply using his monstrous alter-ego to play both sides.
** ''Series/KamenRiderExAid'': The title character flips between his normal identity of caring doctor Hojo Emu and the brash, confident Genius Gamer M whenever he transforms, with an early upgrade allowing them to split into two bodies to become Ex-Aid at the same time. Both are equally heroic, until much later in the show when it comes out that "M" is actually Emu's EnemyWithout Parado.
** ''Series/KamenRiderRevice'': Daiji Igarashi/Kamen Rider Live and Kagero/Kamen Rider Evil are a straight example, with their shared Driver changing forms to match whichever one is in control. Daiji eventually manages to kill Kagero, but in this case Jekyll on his own turns out to be much worse than Hyde.
* ''Series/Mouse2021'' plays with this. After a BrainTransplant Ba-reum ends up with part of Yo-han's brain. All the evidence suggests Yo-han was a serial killer, so when Ba-reum starts having flashbacks to murders he assumes Yo-han's personality is still alive in his brain. [[spoiler: Actually Ba-reum was the killer and Yo-han was innocent, so Ba-reum's original personality is the "Hyde" and Yo-han is the "Jekyll".]]



* In the original live-action series of ''[[WesternAnimation/FilmationsGhostbusters The Ghost Busters]]'', the ghost of Dr. Jekyll is one of the ghosts the Busters deal with as he materializes in the castle trying to cure himself of Hyde. Interestingly, Hyde is rendered as a separate entity from Jekyll, taking the form of an obnoxious man in a caveman outfit.

to:

* In A show called ''Series/MyOwnWorstEnemy'' features a man leading a double life. His normal side is Henry and his alternate ego (that he doesn't know about) is the spy Edward, which is most likely an allusion to the original live-action series of ''[[WesternAnimation/FilmationsGhostbusters The Ghost Busters]]'', the ghost of Dr. Henry Jekyll and Edward Hyde. Reverses the usual Jekyll/Hyde dynamic in that Edward is one the original personality; Henry is a construct. While Edward is the edgier of the ghosts the Busters deal with as he materializes in the castle trying to cure himself of Hyde. Interestingly, Hyde is rendered as a separate entity from Jekyll, taking the form of an obnoxious man in a caveman outfit.two personalities, he's not actually evil.


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* ''Franchise/PowerRangers'':
** Mesogog and Anton Mercer from ''Series/PowerRangersDinoThunder''. Eventually Mesogog splits himself off from Mercer because he gets fed up with sharing. It frees the Rangers to not hold back against him, but he becomes even more effective due to being able to act more often and not just when he surfaces.
** A similar example is the villains [[TheChessmaster Heckyl]] and [[TheBrute Snide]] from ''Series/PowerRangersDinoCharge''. Played with, however, in that both personalities are firmly evil, just preferring different methods and disdaining the other's. Towards the end, Heckyl has a HeelFaceTurn, and Snide uses some tech to [[LiteralSplitPersonality completely separate them]].
* Adam Worth from ''Series/{{Sanctuary}}'' is said to be the in-universe explanation for the novel. Neither personality is particularly stronger, but unlike most examples, both sides work in tandem.
* ''Series/{{Smallville}}'':
** Davis Bloome[=/=]Doomsday.
** Before that, when Clark tried to explain himself to Chloe about not being himself lately (Lionel Luthor had swapped bodies with him), she stated that people sometimes act as Jekyll and then as Hyde but are the same after all.
* ''Franchise/StarTrek'':
** A brainwashed Geordi is used as an assassin on ''Series/StarTrekTheNextGeneration''.
** One episode of ''Series/StarTrekVoyager'' has [[spoiler: the Doctor]] develop a villainous split personality which he is unaware of as a result of [[spoiler: making some unwise adjustments to his programming]].
** ''Series/StarTrekTheOriginalSeries'' has "The Enemy Within", where a transporter malfunction splits Kirk's good and evil sides.
* ''Series/{{Supernatural}}'': Kind-and-gentle human Sammy, arrogant-and-violent demonic Sammy. And then there is soulless robo Sammy...
* ''Series/TheVampireDiaries'':
** Stefan Salvatore. He has one side of his personality which is kind, caring, empathetic and compassionate and heroic ("Jekyll", Hero!Stefan) and another side of his personality which is sociopathic, crazy, addictive, cold and ruthless ("Hyde", Ripper!Stefan)
** Alaric Saltzman is a better example. Normally a good-hearted vampire hunter, he develops a serial killer Hyde persona from dying too often.
* ''Series/WhereInTimeIsCarmenSandiego'' had a girl named Jacqueline Hyde, who jumped from sweet, innocent schoolgirl to raving, snarling harpy at the drop of a hat.
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trpoe merge


* In the ''VideoGame/{{Neptunia}}'' series, [=CPUs=] are a mild example. While there's only one consciousness and they retain all their memories, goals, etc. during the voluntary transformation, their normal and [[SuperMode Hard Disk Divinity]] forms can have very different personalities. [[TheSlacker Neptune's]] HDD form being a more mature LadyOfWar is one example. Another is Plutia, who goes from a friendly, scatterbrained girl to a [[BastardGirlfriend stone-cold]], [[TheDreaded ally-terrifying]] {{Dominatrix}}.

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* In the ''VideoGame/{{Neptunia}}'' series, [=CPUs=] are a mild example. While there's only one consciousness and they retain all their memories, goals, etc. during the voluntary transformation, their normal and [[SuperMode Hard Disk Divinity]] forms can have very different personalities. [[TheSlacker Neptune's]] HDD form being a more mature LadyOfWar is one example. Another is Plutia, who goes from a friendly, scatterbrained girl to a [[BastardGirlfriend [[FetishizedAbuser stone-cold]], [[TheDreaded ally-terrifying]] {{Dominatrix}}.

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!!!'''You may be looking for ''Literature/TheStrangeCaseOfDrJekyllAndMrHyde'' or its stage musical adaptation ''Theatre/JekyllAndHyde''.'''



Not to be confused with the stage musical [[Theatre/JekyllAndHyde of the same name]].
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* * ''Franchise/{{Nasuverse}}'': The TropeNamer shows up in ''Anime/FatePrototype: Fragments of Sky Silver'' as Berserker, and in ''VideoGame/FateGrandOrder'' as an Assassin whose main mechanic is transforming into a Berserker. Although Henry Jekyll remains a NiceGuy {{Bishounen}} in both media, Edward Hyde is a wolfman-like monster in ''Fragments'' but remains fully human with [[UnkemptBeauty wild hair and bloodshot eyes]] in ''Grand Order''.

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* * ''Franchise/{{Nasuverse}}'': The TropeNamer shows up in ''Anime/FatePrototype: Fragments of Sky Silver'' as Berserker, and in ''VideoGame/FateGrandOrder'' as an Assassin whose main mechanic is transforming into a Berserker. Although Henry Jekyll remains a NiceGuy {{Bishounen}} in both media, Edward Hyde is a wolfman-like monster in ''Fragments'' but remains fully human with [[UnkemptBeauty wild hair and bloodshot eyes]] in ''Grand Order''.
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None

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* * ''Franchise/{{Nasuverse}}'': The TropeNamer shows up in ''Anime/FatePrototype: Fragments of Sky Silver'' as Berserker, and in ''VideoGame/FateGrandOrder'' as an Assassin whose main mechanic is transforming into a Berserker. Although Henry Jekyll remains a NiceGuy {{Bishounen}} in both media, Edward Hyde is a wolfman-like monster in ''Fragments'' but remains fully human with [[UnkemptBeauty wild hair and bloodshot eyes]] in ''Grand Order''.
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* ''WesternAnimation/SpiderManTheAnimatedSeries'' - Norman Osborn and the Goblin; unlike most depictions, this version of Osborn was a decent guy (or at least trying to be one), while the Goblin was as homicidal as ever.
* Morph from the ''WesternAnimation/XMen'' animated series, after coming BackFromTheDead, often wavered back and forth between his normal, "Jekyll" self and a semi-undead "Mr. Hyde" alter-ego who blamed the X-Men for leaving him behind on a failed mission. It turned out he was [[BrainwashedAndCrazy mind-controlled]] by the season's BigBad, but the effects didn't leave him for a good while afterward. At one point, he even hides out with a theater troop, where he performs "Jekyll and Hyde", using his [[VoluntaryShapeshifting shapeshifting]] powers to play both roles.

to:

* ''WesternAnimation/SpiderManTheAnimatedSeries'' - Norman Osborn and the Goblin; Goblin in ''WesternAnimation/SpiderManTheAnimatedSeries''; unlike most depictions, this version of Osborn was a decent guy (or at least trying to be one), while the Goblin was as homicidal as ever.
* Morph from the ''WesternAnimation/XMen'' animated series, ''WesternAnimation/XMenTheAnimatedSeries'', after coming BackFromTheDead, often wavered back and forth between his normal, "Jekyll" self and a semi-undead "Mr. Hyde" alter-ego who blamed the X-Men for leaving him behind on a failed mission. It turned out he was [[BrainwashedAndCrazy mind-controlled]] by the season's BigBad, but the effects didn't leave him for a good while afterward. At one point, he even hides out with a theater troop, where he performs "Jekyll and Hyde", using his [[VoluntaryShapeshifting shapeshifting]] powers to play both roles.



* ''WesternAnimation/CountDuckula'' - episode "Doctor Goosewing and Mr. Duck". Von Goosewing invents a potion that reverses everyone's personality. He and Duckula become "wicious wampires", Igor becomes happy and loving and Nanny becomes a brainbox.

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* In the ''WesternAnimation/CountDuckula'' - episode "Doctor Goosewing and Mr. Duck". Duck", Von Goosewing invents a potion that reverses everyone's personality. He and Duckula become "wicious wampires", Igor becomes happy and loving and Nanny becomes a brainbox.
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* In ''Skulduggery Pleasant'', there's [[spoiler: Darquesse for Valkyrie]] and [[spoiler: Lord Vile for Skulduggery.]]

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* In ''Skulduggery Pleasant'', ''Literature/SkulduggeryPleasant'', there's [[spoiler: Darquesse for Valkyrie]] and [[spoiler: Lord Vile for Skulduggery.]]

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** The episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker.

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** Beetlejuice's sentient car Doomie is ordinarily docile and amiable, but occasionally turns into a manic, werewolf-like vehicle called the Dragster of Doom.
** The episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker. Beetlejuice is turned into a handsome and germophobic version of himself, which wears off the instant he starts bathing, and the end of the episode has Mayor Maynot become a hippie who's happy to let Beetlejuice off the hook for once.

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* The ''WesternAnimation/{{Beetlejuice}}'' episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker. There was also another episode where Beetlejuice briefly visited a doctor in the Neitherworld whose Jekyll self was patient in getting Beetlejuice to cooperate, but would turn into Hyde when BJ started to get on his nerves.

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* ''WesternAnimation/{{Beetlejuice}}'':
**
The ''WesternAnimation/{{Beetlejuice}}'' episode "Dr. Beetle And Mr. Juice" has B.J. creating a perfume that has a weird effect--it turns whoever applies it into their opposite personae. When it accidentally hits Lydia, she turns from being sweet and introverted into an obnoxious prank-playing biker. There was also another
** The
episode where "Beetlebones" began with Beetlejuice briefly visited having his bicentennial checkup from a doctor in the Neitherworld whose doctor who is a version of Dr. Jekyll self was patient in getting and Mr. Hyde, with the difference of personalities being that Jekyll tries to patiently get Beetlejuice to cooperate, but would turn into cooperate and Hyde being irate and snappy when BJ started Beetlejuice chooses to get on his nerves.not take the medical checkup seriously.
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-->-- '''Bruce Wayne/Franchise/{{Batman}}''', ''Film/BatmanForever''

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-->-- '''Bruce Wayne/Franchise/{{Batman}}''', Wayne/Batman''', ''Film/BatmanForever''



* Season 6 of Dexter has [[spoiler: Travis and Professor Gellar]] turning out to be just one person, they even try to Sixth Sense the twist for nine episodes. It was painfully obvious.

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* Season 6 of Dexter ''Series/{{Dexter}}'' has [[spoiler: Travis [[spoiler:Travis and Professor Gellar]] turning out to be just one person, they even try to Sixth Sense the twist for nine episodes. It was painfully obvious.


Sometimes, though, the “Hyde” is not really [[DarkIsNotEvil evil; it may just be more instinctual or capable of using violence when necessary]]... See DrPediaAndMrTrope for the {{Wiki Trope|s}} version of this. Also, a "Jekyll" persona isn't necessarily entirely "good" either — it may just be subtler or more self-controlled. After all, in the original story, Jekyll created Hyde as an outlet for his darker impulses, thus acknowledging that he ''had'' such impulses. Occasionally, the situation can be resolved (not necessarily favorably) with a SplitPersonalityTakeover, or with a SplitPersonalityMerge that reconciles both sides into a healthy whole. See also SuperpoweredEvilSide and HelplessGoodSide.

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Sometimes, though, the “Hyde” is not really [[DarkIsNotEvil evil; it may just be more instinctual or capable of using violence when necessary]]... See DrPediaAndMrTrope JustForFun/WikipediaBehavior for the {{Wiki Trope|s}} wiki version of this.this, also known as "Dr. Pedia and Mr. Trope". Also, a "Jekyll" persona isn't necessarily entirely "good" either — it may just be subtler or more self-controlled. After all, in the original story, Jekyll created Hyde as an outlet for his darker impulses, thus acknowledging that he ''had'' such impulses. Occasionally, the situation can be resolved (not necessarily favorably) with a SplitPersonalityTakeover, or with a SplitPersonalityMerge that reconciles both sides into a healthy whole. See also SuperpoweredEvilSide and HelplessGoodSide.
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** In "Stronger Than I Was", the narrator describes their lover as 'Jekyll and Hyde' - one of the many reasons fans interpret the song as being [[PerspectiveFlip from Kim's perspective]].

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** In "Stronger Than I Was", the narrator describes their lover as 'Jekyll and Hyde' - one of the many reasons fans interpret the song as being [[PerspectiveFlip from Kim's perspective]].the perspective of Kim, Eminem's ex-wife]] and [[MuseAbuse constant lyrical punchbag]].
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** In "Stronger Than I Was", the narrator describes their lover as 'Jekyll and Hyde' - one of the many reasons fans interpret the song as being [[PerspectiveFlip from Kim's perspective]].
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Titles of works are to be italicized, and you can't drink solid edibles.


* The ''WesternAnimation/DextersLaboratory'' episode "Monstrosi-Dee Dee" has Dee Dee drinking an experimental apple and repeatedly turning into a monster and back. The episode is a ShoutOut to Friz Freleng's cartoons mentioned above.

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* The ''WesternAnimation/DextersLaboratory'' episode "Monstrosi-Dee Dee" has Dee Dee drinking an experimental consuming a contaminated apple and repeatedly turning into a monster and back. The episode is a ShoutOut to Friz Freleng's cartoons mentioned above.



* The WesternAnimation/HereComesTheGrump episode “Witch is Witch” had Terry and Princess Dawn encounter a friendly witch who would become an evil witch every time she said the word “nasty”, she would change back into her nice personality when she said “nice”.

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* The WesternAnimation/HereComesTheGrump ''WesternAnimation/HereComesTheGrump'' episode “Witch is Witch” had Terry and Princess Dawn encounter a friendly witch who would become an evil witch every time she said the word “nasty”, she would change back into her nice personality when she said “nice”.

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