History Main / JekyllAndHyde

* Anna and Susan in ''[[http://Sire.smackjeeves.com Sire]]''. Indeed, they obsess over the original Stevenson work, and are even [[spoiler:descended from Edward Hyde]].

*** "Hyde and Hare": Bugs 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.

*
''WesternAnimation/TheProudFamily'':
In season 3 episode 10 of The Proud Family, it's revealed that Michael Collins has a monstrous Hyde persona that may have supernatural abilities.

* ''VideoGame/{{Xenogears}}'' - [[spoiler:Fei, the player's character, and Id, the mysterious super-powerful lone villain.]]

* There are some ''WesternAnimation/LooneyTunes'' cartoons exploiting this trope that Friz didn't do:
** "The Case of the Stuttering Pig", directed by Creator/FrankTashlin: Mr. Goodwill, the lawyer, [[ExploitedTrope exploits]] this trope to get rid of a 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.
** "The Impatient Patient", directed by Norman [=McCabe=]: 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.
** "The Prize Pest", directed by Creator/RobertMcKimson: 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.

* ''WesternAnimation/TheRobonicStooges'': The episode "Dr. Jerkyll and Hyde Curly" has Dr. Jerkyll creating his Red Hot Atomic Pepper while in prison. He dusts it all over himself and, as a result, an ugly, Mr. Hyde-like head grows in the back of his head. With the 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 control their bodies (but not minds) to make them do Jerkyll's 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:

* Creator/FrizFreleng was particularly fond of this trope, seeing the 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 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.

*** "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": Effectively a remake of Freleng's "WesternAnimation/TreeForTwo", only instead of Spike (renamed Alf here) being walloped by a panther, Sylvester hides in Dr. Jerkyl's laboratory while running away from the dogs where he drinks the formula and becomes a monster cat capable of beating up Alf.
*** "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.

** The {{Elseworlds}} comic ''Batman: Two Faces'' has Bruce Wayne in the Jekyll role, trying to create a serum to cure the split personality of Harvey Dent. [[spoiler:We basically end up with "Dr. Batman and Mr. Joker".]]

* ''Film/BeforeIHang'': After taking the age-reveral serum, Dr. Garth is occasionally overcome by a sudden urge to kill induced by the presence of an executed murderer's blood in his system. Garth does not remember committing these murders under the influence of the serum.

* ''Manga/The100GirlfriendsWhoReallyReallyReallyReallyReallyLoveYou'': Kurumi is usually a sweet girl, but once she becomes hungry (which is almost always), she becomes aggressive until her hunger is satisfied.

See HydeAndSeek for when TheFool turns into Mr. Hyde because of his own idiocy and his companion is none the wiser, so it's all PlayedForLaughs. See also HydePlaysJekyll, when the Hyde personality is in control and pretends to be Jekyll in order to fool others.

See HydeAndSeek for when TheFool turns into Mr. Hyde because of his own idiocy and his companion is none the wiser, so it's all PlayedForLaughs.

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.

* Kyo and Kyoshiro in ''Manga/SamuraiDeeperKyo.'' [[spoiler: Subverted in the manga, played straight in the anime.]]

* In ''Manga/DGrayMan'', this is the case with Tyki Mikk and possibly the rest of the Noah... Though probably just Tyki (who 'loves humans'); his mind remains constant between sides, and he gave his little friend the silver off a murdered exorcist's coat as a present. If Allen ''had'' gotten it, the plot might have run a bit differently... Also, White Tyki appears to be effectively dead. His identity took a serious scramble back when Allen thought he'd cut the evil out of him and got a ''[[SuperPoweredEvilSide really ]]''[[SuperPoweredEvilSide superpowered ]]''[[SuperPoweredEvilSide especially ]]''[[SuperPoweredEvilSide evil side]] instead. Surprising he pulled himself back together, but he's different. The Noah are activated out of normal humans, whenever a seat is left unfilled by a death in the family, and for the most part memory is not continuous from incarnation to incarnation, but those persons are still subsumed into the Noah identity once activated. [[spoiler: This is one of the things Allen is trying to prevent happening to him.]] Whether [[BigBad Adam the Millennium Earl]] and the Fourteenth have died and recorporated before is not clear; very possibly they haven't. Road is over thirty five now; it's possible Adam has kept that rakish young face for thousands of years. (And covered it with a grinning balloon thing in a goofy hat about as long. Mysteriously.)

** ''ComicBook/BatmanTheDarkKnightReturns'' turns this on its head. [[spoiler: Recent breakthroughs in plastic surgery have restored his face to normal, but at the unforeseen cost of forever destroying the "Harvey" half of his personality, and permanently leaving the "Two-Face" half in complete control.]]

** The {{Elseworlds}} comic ''Batman: Two Faces'' has Bruce Wayne in the Jekyll role, trying to create a serum to cure the split personality of Harvey Dent. [[spoiler: We basically end up with "Dr. Batman and Mr. Joker".]]

* ''Fanfic/TheSecretReturnOfAlexMack'': As per canon, getting doused with GC-Divide causes you to split into a "good" and "bad" version of yourself. [[spoiler: Alex uses it on Danielle Atron and then leaves her to fight the "good" version of herself -- which wins the fight and kills the evil Danielle, effectively becoming an unusual sort of HeelFaceTurn.]]

* A major twist in ''Film/{{Atlantics}}''. [[spoiler: Detective Issa is hell-bend on catching Souleiman, and convinced he's around and responsible for all the fires. It turns out that Issa's fainting spells result in him being possessed by Souleiman's ghost, and that he is unknowingly responsible for all the crimes he's investigating.]]

* [[spoiler: Norman Bates and his mother]] in ''Film/{{Psycho}}''. [[ItWasHisSled Only spoilered because]] Creator/AlfredHitchcock [[GrandfatherClause doesn't want us to spoil the movie for others.]]
* [[spoiler: David Callaway and Charlie]] in ''Film/HideAndSeek''.

* In ''Film/CitizenKane'', Charles Foster Kane tells Thatcher early on, "The trouble is, you don't realize that you're talking to two people," referring to himself as both a man of wealth and as a man of the people. One of the main points of the movie is the internal war between those two sides. [[spoiler: It can be argued that both sides lose by the end of the movie.]]

* ''Film/{{Split}}'': Kevin has 24 personalities. They range the gamut from extroverted fashion designer Barry to Central Asian history buff Orwell to the kidnapping Dennis to [[spoiler: The Beast who combines animalistic strength and an insane ideology about suffering.]]

* In the ''Literature/{{Xanth}}'' book ''Crewel Lye'', [[spoiler: there's a Magician named YinYang who spends a lengthy amount of time pretending to be two different people, Yin and Yang, who were having a competition to see which one should be heir to the current King. It turns out that the competition was about which side of his personality should take over.]]

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

* 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]].

** Done rather well with [[spoiler: Professor Yana]] and the Master.
** [[spoiler: The Doctor and the Dream Lord]]

* ''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 ''Series/MurdochMysteries'' episode "Excitable Chap", a mysterious Lurker begins not-exactly-terrorising ladies [[spoiler: at the same time as James Pendrick is developing his new brain-enhancement drug. It inevitably turns out that state of unconsciousness he enters after his period of frenzied work is actually him acting out his subconscious desires as the Lurker. When the Lurker seemingly kills someone, Julia points out that if Pendrick isn't a natural killer, his Lurker wouldn't have murder in him either. It turns out someone else has been taking the drug.]]

** 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]].

* [[spoiler: Pat and his evil other-self Rey]] in the first ''VideoGame/MegaManStarForce''.
* ''VideoGame/{{Xenogears}}'' - [[spoiler: Fei, the player's character, and Id, the mysterious super-powerful lone villain.]]

* In the iOS game ''VideoGame/LaytonBrothersMysteryRoom'', [[spoiler: Alfendi]] is in this predicament thanks to an incident 4 years ago. However, it seems that the [[spoiler: "Hyde"]] is the real personality while his new persona is the [[spoiler: Jekyll]].
* In ''VideoGame/MetalGearAcid'', Solid Snake realises he knows a lot more about the facility than he expected. It's explained to him that he took the alias "Hans Davis" to perform some hideously unethical experiments on psychic children, and through repressing his memory of these events and of all the other terrible things he's done in his life, the ruthless and evil Hans has become an alternate personality into which he occasionally switches or even hallucinates conversing with. [[spoiler: This is eventually revealed to all be the result of psychic {{Gaslighting}}.]]

* ''VideoGame/DeadInVinland'' has one that comes as a shock [[TheReveal reveal]]: [[spoiler: gentle, helpful, devoutly religious Brother Angelico has been having dissociative blackouts for most of his life in which he becomes an AxCrazy SerialKiller and then flogs himself with a whip, crying about "the demon." It's left MaybeMagicMaybeMundane whether it really is a demon; the player can choose to kill him, exile him, or find a way to cure him.]]

* Anna and Susan in ''[[http://Sire.smackjeeves.com Sire]]''. Indeed, they obsess over the original Stevenson work, and are even [[spoiler: descended from Edward Hyde]].

** [[spoiler:Calliope and her "brother"]] share a body, and switch places whenever one goes to sleep or hears the other's name. [[spoiler:Calliope]] is one of the sweetest and most helpful people the [[spoiler: Post-Scratch]] Kids have. Her brother, [[AxCrazy on]] [[JerkAss the]] [[BloodKnight other]] [[LaughingMad hand]]... This is actually ''normal'' [[BizarreAlienBiology for their species.]]

* This is how [[WebVideo/TheSpoonyExperiment Spoony]] and [[MadScientist Dr. Insano]] are portrayed in the Website/ThatGuyWithTheGlasses anniversary special ''WebVideo/{{Kickassia}}''. This is subject to NegativeContinuity;[[spoiler: ''WebVideo/ToBoldlyFlee'' had retconned this into an anomaly caused by the PlotHole, in 'reality', Spoony and Insano are indeed two separate people.]]

* ''WesternAnimation/TheRobonicStooges'': The episode "Dr. Jerkyll and Hyde Curly" has Dr. Jerkyll creating his Red Hot Atomic Pepper while in prison. He dusts it all over himself and, as a result, an ugly, Mr. Hyde-like head grows in the back of his head. With the 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 control their bodies (but not minds) to make them do Jerkyll's 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:

** 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.]]

* The 2006 film ''Film/AScannerDarkly'' has the main character hunting down a drug dealer who is in fact himself, having developed split personalities from the drug.

[[folder: Puppet Shows]]

*** The ''Pink Panther'' section: In "Pink Lightning", Dr. Jekyll fuels his malfunctioning car with the same pink jig he takes to transform into Mr. Hyde (he's transformed at the time). That same car is bought by the Pink Panther. When it stalls, it turns into a monstrous, super fast form that gets the Pink Panther in trouble with the police.

*** "Dr. Jerkyl's Hide": Silvester hides in Dr. Jerkyl's laboratory while running away from the dogs Alfie and 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 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 his boss is afraid of a cat. Later, Alfie causes the liquid to fall on a fly, who also kicks his ass.

* The {{Elseworlds}} comic ''ComicBook/{{Batman}}: Two Faces'' has Bruce Wayne in the Jekyll role, trying to create a serum to cure the split personality of Harvey Dent. [[spoiler: We basically end up with "Dr. Batman and Mr. Joker".]]

* The quevari, a human subspecies from the TabletopGame/{{Ravenloft}} setting, live as benign vegetarian pacifists by day, but are bloodthirsty killers by night. The darklord of Nova Vaasa, Sir Tristan Hiregaard, struggles against his crime-lord alter ego Malken.

* The Zenescope horror comic Grimm Tales of Terror featured a Jekyll and Hyde story as its first issue of its second volume. A bullied nerd creates a serum that turns him into a more hunky alter ego. [[spoiler:The twist is that the original "Jekyll" turns out to be the evil one.]]

* ''Anime/MagicalProjectS'': Misao Amano's normal self is that of a stereotypical ShrinkingViolet [[FriendlessBackground friendless]], [[ShyBlueHairedGirl blue-haired]] IllGirl. However, this persona falls away when she's transformed into Pixy Misa, the manifestation of her deeply repressed id: an egomaniacal [[GreenEyedMonster jealous]] DarkMagicalGirl [[VillainousHarlequin trickster]].

*** ''WesternAnimation/TheInspector'': In the episode "Sicque! Sicque! Sicque!" , Sgt. Deux-Deux drinks the classic potion and becomes a monster.
*** In "Pink Lightening" [[RecycledScript the same happens]] to The Pink Panther's old car 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.

See HydeAndSeek for when it's PlayedForLaughs.

[[folder:Anime and Manga]]

*** "Dr. Jerkyl's Hide": Silvester hides in Dr. Jerkyl's laboratory while running away from the dogs Alfie and 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 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.

** ''WesternAnimation/TheInspector'': In the episode "Sicque! Sicque! Sicque!" , Sgt. Deux-Deux drinks the classic potion and becomes a monster.