"I'm an insect who dreamt he was a man and loved it. But now the dream is over... and the insect is awake."
are pretty damn scary. Horrible, bug-eyed, slobbering, and in no way ever
human. Therefore, it's all the more unsettling
when it's revealed that a monstrous creature was once human, but became a monster through some sort of infection
, sheer personal evil
and there's no means of changing them back.
Related to Body Horror
and Face Monster Turn
, but distinct in that while Body Horror
deals with the fact of the monstrosity itself and usually follows it from beginning to end, Was Once a Man is where a creature is monstrous when first introduced, but is either implied heavily or later revealed to have once been human.
Sometimes the mind is not affected; only the body is
. Sometimes the original mind can be reached.
This does not undermine the horror of it. Indeed, in certain ways, it makes the horror even worse
See also: Body Horror
, Viral Transformation
, The Virus
, Tragic Monster
and Stages of Monster Grief
. Compare and
contrast Uncanny Valley
. Also contrast with Ascend to a Higher Plane of Existence
, for a non-monstrous transformation.
This trope has nothing to do with Gender Bender
. Also not to be confused with Was Once A Man From Nantucket
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Anime and Manga
- The manga of Chrono Crusade has an unusual example revealed towards the end: Pandaemonium was once a human woman pregnant with twins. The demons kidnapped her and transformed her into the monstrous, Mind Rape-using queen she is — and transformed her human children, Chrono and Aion, into demons as well.
- In Xam'd: Lost Memories, it becomes clear fairly early on that both humanform weapons and Hiruko are former humans.
- Each and every of the Awakened Beings in Claymore. And, perhaps more shockingly, the Abyss Eaters. Even more shockingly, the Youma.
- Every demon in the Berserk universe was once a human. Humans become demons when a creepy little egg-like item called a Behelit comes into their possession and they hit an emotional nadir where they will do anything to get out of their current situation. At this point, the Behelit rearranges the features scattered upon its surface into a human face and screams, which summons the demonic gods of the Godhand, who proceed to offer him the chance to become a demon in exchange for the sacrifice of those closest to them. It also turns out that every member of the Godhand was also human, and they are created with the use of Behelits as well. While demons do sometimes retain the personalities they had when they were human, all too often they commit Transhuman Treachery, with many of them preferring to dine on their former species. When demons die, they typically revert to their former human forms after their spirits are Dragged Off to Hell.
- Anna from Elfen Lied... When first introduced, she is an adorable and happy, if dimwitted, young girl who loves to run. Her father is disappointed with her lack of intelligence, and transforms her into an enormous, horribly mutated creature with super-intelligence and precognitive ability. She cannot support the weight of her gigantic head, and so must remain virtually immobile in a pool. Remember how she loved to run? Yeah.
- King of Thorn has the "mother monster", which is eventually revealed to have been a human (Shizuku) who succumbed to The Virus.
- World Embryo - The enemy virus, Kanshu, were once humans who lost their memories and transformed into hideous beings upon listening to the infected radio signals in their cell phones.
- Bleach. Every Hollow started out as a lost human soul. Eventually, it lost its heart, whether through time or the attacks of another hollow, and became a monster, feeling nothing but the desire to murder and a hunger for souls.
- If they survive long enough, Hollows can "get over it" on their own (or if someone else removes their mask or uses the Hogyoku on them) and become Arrancar, who are intelligent creatures and apparently don't need to eat souls anymore (considering that they have copious amounts of regular food in Las Noches and only three or so Arrancar are ever shown any desire to eat anyone... and of those, one is a Mad Scientist who's turned his minions into edible medicine and another has the ability to gain the powers of anyone he eats, so they're not just eating for the sake of eating.)
- Similarly, the Akuma of D.Gray-Man. As with Hollows, their hunters know, at least in abstract that they contain the souls of innocent people forever tortured until the Akuma are destroyed and they're released, but only Allen has to confront the vision of them on a daily basis. As with Hollows (though in Bleach it's a different story), leveling up obscures more and more the original souls, until even Allen can't see them anymore. It also makes new souls in the process.
- Some of the monsters in Sailor Moon, were (for the most part) originally human. Some of the Youma in the first season and the Phage of the last season. Sailor Moon's power to restore the Phage to normal actually shocks the Starlights, as they had to simply destroy them because they lacked the ability to do so. (Though they implied their Princess could, as they stated they had to destroy them without her around). A single human-based Daimon also appeared in a flashback which was closer to their manga version.
- Hakkai from Saiyuki.
- Though he's not terribly monstrous or inhuman now, even in his demon form, and only really has to avoid it because the minus wave currently makes demons Ax-Crazy.
- In Puella Magi Madoka Magica, it turns out that the Witches that the magical girls fight (those that aren't ex-familiars, anyway) was once a magical girl herself, and to make things even worse, every magical girl is ultimately doomed to become one of the very monsters she's been fighting, unless she dies first.
- In Fullmetal Alchemist, Shou Tucker, the Sewing Life alchemist, fuses his adorable daughter Nina with her dog, Alexander. He also fused his wife with another beast a few years back, in order to gain his certification. Both chimeras are able to talk, and they both made it known they were not happy with their new existence. The one made of his wife asked to be killed and when it wasn't obliged it starved itself. The one made of Nina and Alexander is killed by Scar.
- The dragon Acnologia from Fairy Tail was originally a slayer. After killing countless dragons he was apparently a turned into one himself by Zeref. Turns out this is something that happens to all Dragon Slayers eventually, unless they have certain antibodies to prevent it. The present-day Dragon Slayers' Dragon parents sealed themselves in their children for seven years to create those antibodies.
- Yubel, the Big Bad of season three of Yu-Gi-Oh! GX. She willingly gave up her humanity and was turned into a demon in order to become a spiritual guardian for her ward (who would become Judai in a later life).
- All of the villains originating from the Bad Future of Yu-Gi-Oh! 5Ds, including Z-one, Aporia, and Paradox. The first is a cyborg with god-like powers, while the other two are android incarnations of their previous selves.
- The Seven Barian Emperors, the antagonists of the second season of Yu-Gi-Oh! ZEXAL, were all once human, and they can assume human forms that resemble - for the most part - their original forms.
- One Piece has the island of Dressrosa. There humans and living toys live together. Except unlike other fantastic beings in One Piece, these "toys" were once humans but turned into toy creatures by a Devil Fruit user.
- In Attack on Titan, Titans were once human. The only difference between Shifters like Eren and regular Titans is that he was able to control the power. Regular Titans appear to have fully absorbed their human "pilot", reducing them to mindless horrors that seek out humans to eat. Ymir was able to regain her humanity after 60 years, though the exact method is unknown. It is, however, hinted to involve the fact that she ate a suspected Shifter around the same time....
- In Ahiru No Oujisama, Mister was once a prince, but is now an ugly dog. He turns back...after being a short ugly weirdo for a bit he gets back to being a bishonen.
- In Naruto the thousands of Zetsu clones were victims of the first Infinite Tsukiyomi rather than clones of Hashirama. The end goal of Kaguya is to create an army using the same technique.
- The Juubi was created when Kaguya merged herself into the God-Tree.
- In Magi – Labyrinth of Magic, all the Djinns were revealed to be once members of the sentient species that were freed and later allied with Solomon.
- This happens a lot to people who go under Franken Fran's scalpel, or that of her creator.
- Rosario + Vampire: Hokuto Kaneshiro is revealed to be this, having been human like Tsukune before being injected with Kiria's blood. His new true form is infinitely more horrifying.
- Judge Dredd:
- The Mutant, a hideous multi-limbed...thing from an alternate future timeline where he tortured and killed Judge Dredd and Judge Anderson, as well as destroyed Mega City One, ruling over the ruins along with the now corrupted and mutated judges. He is actually Owen Crysler from The Judge Child storyline
- Another comic revolves around a man who is secretly given a serum based on dinosaur DNA by his upstairs neighbor, a Mad Scientist who slips it into his food. He ends up slowly devolving into a hideous reptile man, and eats and kills his wife and the scientist before Dredd is forced to kill him.
- Judge Death started out as human before he met the Sisters of Death, who transformed him into the undead monster we know him as now. When his fellow Dark Judges see the results, they ask for the same to be done to them. The Sisters themselves used their magic to cast off their mortal bodies as they entered the astral plane, then return to the world of the living as banshee-like ghosts.
- There's a rare genetic mutation which will slowly turn the afflicted person into a human-sized spider. Played for Drama in one comic when a woman with the condition is abandoned by her husband, Played for Laughs in another one when the test results of two patients are accidentally mixed.
- Invoked in Strikeforce: Morituri with the "mutants", four humans who were accidentally turned into super-powered monstrosities when they underwent the Morituri Process without proper supervision.
- In Camelot 3000, Morgan la Fay keeps an ape-like animal on a leash as a Right-Hand Attack Dog. At one point, she informs an underling that it was once a man, until he got on her nerves.
- Galactus of the Marvel Universe was once a man of the previous universe named Galan. As his universe died to pave way for the new, current one, Galan journeyed into the center of the Big Bang refusing to give in to destruction. The powers that be were impressed and transformed him into Galactus.
- In B.P.R.D., it is revealed that Abe Sapien was once a human named Langdon Everett Caul, and has been alive since the 19th century.
- Of course, there are several other examples in both BPRD and Hellboy, such as the frog monsters, or the Too Dumb to Live wannabe satanist aristocrat couple who fell afoul of minor demon Ualac in Box Full of Evil.
- Played with in Paperinik New Adventures: the surviving Xerbians initially consider Xadhoom an alien monster (albeit an allied one), and are quite unsettled when they find out she was once their leader. Them expressing the wish to make her return to normality also caused them to receive a "The Reason You Suck" Speech (with A God Am I thrown in to hammer down she has no reason to return normal) before Xadhoom went for her Heroic Sacrifice.
- Solomon Grundy was once Cyrus Gold, a merchant in 18th century Gotham City, who was murdered and whose body was dumped in the infamous Murder Swamps, where he rose once again as the unkillable Grundy, who would walk the Earth forevermore.
- Man-Thing was a scientist who, upon his death in a Florida swamp, was merged with an attempted recreation of the Super Soldier serum that created Captain America that he had been working on, and became a hideous half man, half plant creature with only the most basic remnants of sentience left.
- Swamp Thing was once Alec Holland, who mutated into a swamp creature through similar means as Man-Thing above. Or so he thought. Alec Holland died out there in the swamps, and the being that rose from the mud was a plant elemental with the absorbed memories and personality of Alec.
- Salem from Sabrina the Teenage Witch was changed from a normal cat to, in the late 90s, into once having been a wizard who was punished to live 100 years as a cat because he tried to take over the world.
- Imperfect Metamorphosis: While never a man per se (on two counts), the Blob Monster (ie. Rin Satsuki) definitely fits.
- In the Portal2 fanfic Blue Sky this is revealed to be true of Wheatley, though he isn't pleased to realise it. He eventually makes it back to his real body.
- A lot of human!Wheatley fanfics invoke this.
- In the My Little Pony: Friendship Is Magic fanfiction Legends of Equestria Discord reveals that he was once a unicorn in ancient times. However, he was transformed by the corrupting power of dark magic after accepting it in an attempt to restore order to his life after his family is killed.
- On a similar note, in Ask Crapplejack it is explained in Equestria's prehistory that Discord was actually one in a race of Draconequusi, and were not twisted and ugly like him, but were beautiful and actually looked like dragons with horse features. Discord's transformation began when a war broke out between the Draconequus race and the race of Alicorns, who lived along side them, and he looked for a way to sway the tides, so he unleashed a powerful god of madness named Genuvial which corrupted his mind and body until he lost sight of the war and decided to turn the world to chaos instead.
- The Ponies Of Olympus series:
- Chrysalis and her subjects used to be normal ponies (implied to have been flutterponies, in fact), before Erebos transformed them.
- And Discord used to be a pony named Endymion and was Luna's lover before some unspecified event led to him trying to take Chaos' powers and being consumed by it.
- Pretty much what a prolongued exposure to gyroids do to people in The Terrible Secret Of Animal Crossing
- In Plasma's Folly, Kelvin reveals that Genesect is actually a middle-aged woman who had become terribly deformed as a result of Team Plasma's attempt to create a Pokémon with human intelligence. She was stuffed into a suit of robotic armor, which is the only thing holding her body together and keeping her alive.
- The Nuptialverse has Chrysalis having once been a normal pegasus who made a deal with Discord for power (she thought he was going to make her an alicorn; he thought that was too boring). Likewise, the other changelings were once flutterponies until Discord needed to give Chrysalis an army.
- Shadows Awakening: The Phantom, as well as the other wizards who created the Shadowkhan, were once human, but the resulting magic of creating the lower, mindless Shadowkhan, caused them to transform (but since they kept their minds and became The Ageless, they didn't care). Daolon Wong later repeats the process as a Mid-Season Upgrade.
- Experiment: The inhabitants of Sezaria were all human once excluding the "original one" - Ladrafiefr/Kaito. Said inhabitants are now freaky aliens with tentacles coming from their backs.
- In the Transcendence AU for Gravity Falls, Dipper was his human self before he became a demon.
Films — Animated
- In Beauty and the Beast, the eponymous Beast was a human prince with a cold heart who was turned into a chimera-esque monster by a sorceress posing as an old woman seeking shelter. The only way for him to break the curse placed upon him was to learn to love another.
- In Brave, an old witch with a strange penchant for bears has at least twice given people "solutions" to their problems that involve turning people into bears. One such transformation resulted in Mor'du, the demon bruin, who having asked for the strength of ten men seems to have taken heartily to his new identity as a complete monster.
- In Rise of the Guardians, while all the Guardians are more supernatural beings than monsters, Tooth implies that they were all mortal before becoming who they are now. Jack was a human who had drowned before the Moon transformed him into an immortal being.
Films — Live-Action
- In the horror film The Cave, one of the monsters bears the same tattoo on its hand as one of the cavers previously seen entombed within the cave system at the beginning of the movie. Which bodes poorly for parasite-infected expedition leader Jack.
- The Reavers in Serenity. Actually, it was BECAUSE their minds were warped that their bodies are so messed up (self mutilation).
- The Cenobites in Hellraiser films. (And when a Cenobite is killed, his or her body turns back into human form, suggesting that killing one of them may be a Mercy Kill in some cases.)
- In the 1973 thriller b-movie Sssssss, mad scientist Dr. Carl Stoner (Strother Martin) turns his lab assistants into king cobras.
- Darth Vader probably qualifies, certainly in spirit: He's more machine than man now, twisted and evil.
- General Grievous certainly does... well, he was Once A Kaleesh, but you get the idea.
- The lizard-monster in The Relic is revealed at the end to be a human explorer who ate a concoction of some particularly funky herbs in South America.
- Davy Jones in the second and third installments of Pirates of the Caribbean. Lampshaded by Calypso, who describes Jones in this manner (and is responsible for the curse that transformed him; she briefly reverts him to his human form as well when they meet again). His crew of mutated humanoid sea creatures also qualify.
- The mutants in the Doom movie. Condemned criminals who were injected with an extra pair of chromosomes, but due to their DNA having "genetic markers for evil", horrifically mutated. And they can sense who else has the same evil genes, so they attack them as well.
- Freddy Krueger from the A Nightmare on Elm Street movies was once a human serial killer, but turned into something resembling a nightmare ghost/demon after his death.
- Jason Voorhees from the Friday the 13th series was once a normal child, birth defects not withstanding. Then he drowned in a lake while camp counselors neglected their duties to have sex in the woods. Now, he's an undead killing machine, slaughtering anyone unlucky enough to come to Camp Crystal Lake.
- Vlad Tepes from the 1992 movie Bram Stoker's Dracula, apparently forsaking God turned him into a bloodsucking beast with power to turn others into vampires just like him.
- Lost in Space: This fate happens to Doc Smith in the future timeline, when he is infested/mutated by spiders.
- In Phantasm, inventor Jebediah Morningside steps through his newly created dimensional gate. The Tall Man is what comes back through.
- The Son'a in Star Trek: Insurrection
- 300: Rise of an Empire: According to Queen Gorgo, Xerxes literally discarded every human part of him to become a God-King by making a deal with evil forces in a desert cave.
- Dracula Untold, shows how Vlad III was before he was a vampire and his transition into the legendary Count Dracula.
- Buffy the Vampire Slayer,: Vampires are humans who have been turned into soul-less demons.
- Several of the monsters on Supernatural, the most important being the demons.
- One later iteration of the Daleks in Doctor Who were produced by "filleting, sifting, and pulping" living humans to render a handful of cells judged strong enough to be shaped into Dalek form and welded into a travel machine.
- Another Dalek faction, the Imperials, were made from Human Popsicles. "Not pure enough in their blobbiness" indeed. And the original Daleks were once the humanoid Kaleds.
- The Toclafane are Axe Crazy flying metal spheres that are able to deploy knives and laserguns. Turns out that they once were humans living at the time of the universe's end. They turned themselves into metal spheres in hopes of surviving the end of the universe.
- And of course the Cybermen, more than any of the others. It's arguably the whole conception behind the way they were originally written in the 1960s.
- In the revived series, the Cybermen all look identical and have the same voice, so it's particularly jarring when Pete Tyler is confronted by a Cyberman that used to be his wife.
- Many stories involving The Virus: e.g., "Mission to the Unknown", "Inferno", and "The Seeds of Doom".
- Poor little Jaimie from "The Empty Child" / "The Doctor Dances".
- The Face of Boe may have once been Jack Harkness, or maybe Jack was just messing with the Doctor, and Martha, when he said that.
- Oswin in "Asylum Of The Daleks". The Daleks turned her into one of them, and she was unable to deal with it, instead dreaming up that she was still human.
- In Power Rangers Time Force, Frax, the robot who worked for Ransik but would eventually go solo, was once a human named Dr. Fericks who saved Ransik's life in the past, but was rewarded with the destruction of his lab and body. After using his own technology to rebuild himself, Frax vowed revenge on Ransik, and infiltrated his organization to bring him down from within.
- Master Org in Power Rangers Wild Force was a Doctor before taking on the powers and identity of the original Master Org. His minions weren't happy when they found out, but he proved to be too much for them when they tried to rebel.
- Zeltrax was transformed into a cyborg after a lab explosion. He is not happy about the loss of his body, and has decided that it is (in a roundabout manner) Tommy's fault. Mesogog was once a human scientist too.
- In Power Rangers Samurai, Deker and Dayu were once human. Dayu sold her soul to save the life of the then-human Deker, but Deker has lost his memory and is now a Blood Knight who fights to satisfy his bloodlust, either by defeating a Worthy Opponent or by being put out of his misery. Last time he fought the Red Ranger, it looks as if the latter has finally happened. However, the season's only half over...
- All Borg in Star Trek started as other species, usually humanoid.
- And Seven Of Nine is an actual human from the Federation.
- The Man in Black on LOST claims to have once been a human before becoming a sentient cloud of smoke. He's now human again, only able to switch between his monster form and John Locke. A flashback episode shows that this is true.
- In the cult One-Episode Wonder series Heat Vision and Jack, the Cool Bike Heat Vision used to be Jack's friend Owen, before he got hit with an experimental ray gun that caused him to merge with his motorcycle.
- The wicked Witches flying monkeys in Once Upon a Time
- The "Oathkeeper" episode of Game of Thrones reveals that a good number of the White Walkers were originally Craster's sacrificed sons whom the Night's King transformed with a touch.
- The eponymous character in the Black Sabbath song "Iron Man" was a well-intentioned human given metallic form by a "great magnetic field" while traveling time to save the future of humanity. He went on to go cuckoo and decimate the human race because after he saves them, they won't help him or accept him.
Mythology & Religion
- Most undead creatures are, naturally, like this. For example: zombies and vampires.
- In some Greek myths, Medusa was a priestess who was transformed as punishment for being raped by Poseidon in Athena's Temple (Athena, pissed that sex was going on in her temple, but unable to actually do anything to Poseidon, opted to punish Medusa instead).
- Quite a lot of animals in Greek myth were actually humans who ticked off the gods and were transformed into beasts - Arachne and King Lykans being the two most prominent.
- Scylla and Charybdis also fall into this category.
- For a full list, read Ovid's Metamorphoses.
- Oddly subverted in the case of Heracles though. Born a man, his heroism leads him to be elevated to a god. Admittedly, one of his parents was a god, but there are plenty of other heroes in Greek mythology who have one divine parent, and Heracles is the only one who manages to become a god himself (though there are several humans who upon their deaths are made into constellations, trees, islands, stars, etc so that they will never 'die').
- Fafnir, aka the dragon from Wagner's Ring cycle, aka the inspiration for Smaug in The Hobbit, Was Once a Man! In fact, he got the gold hoard first, and it cursed him for his greed.
- His siblings, fyi, were a dwarf and an otter. No reason given.
- His brother was a shapeshifter, as was he and his father, hence the otter thing.
- Though it is not supported by The Bible or any major religious traditions, the belief that humans (or at least the good ones) become angels when they die is surprisingly popular amongst Christians. A more theologically sound example from Christianity would be demons, who are said to be angels that rebelled against God and fell from his grace.
- The Bohrok in BIONICLE were Once Av-Matoran. goes into Nightmare Fuel territory when you realize that Nuparu made the Boxor machines out of Bohrok parts, so the Boxors are made out of dead Av-Matoran... and are piloted by Matoran who use them to fight still functioning Bohrok. While he didn't pilot Boxors, one of the topmost fighters in the war against the Bohrok was Takua, himself an Av-Matoran!
- A large number of Dungeons & Dragons monsters qualify, such as vargouilles, illithids (in which a larva eats your brain and uses your body as the foundation for its own), and skum (and pretty much all humanoid undead). A number of prestige classes, such as the alienist and fleshwarper, eventually become something inhuman as well (and not in a good way, like a monk's ascension to outsider status), although without necessarily being evil.
- In Mortasheen, this is the case with the Arthropoids, a class of creature made from humans fused with various type of insects ala The Fly. This also applies to several of the player races, like the Borg, the Sectillians and the Zombies.
- Chaos Spawn define this trope in both Warhammer and Warhammer 40,000. The Chaos Gods reward their champions with many gifts, including physical mutations. Champions rewarded with too many ill-considered gifts will eventually lose their sanity and become little more than beasts, herded into battle by their former followers.
- Special mention goes to Scylla Anfinngrim, a champion of Khorne who devolved into a giant, hairy, shambling clawed horror. Unlike most spawn, he's proven nearly impossible to kill, and his tribe keeps him fed and worship him as the mighty warrior he was in exchange for getting to take a pure killing machine to war with them.
- Also the horrific Tamurkhan from the Warhammer Fantasy supplement Tamurkhan Throne of Chaos. He was turned into a child sized maggot-like creature with multiple eyes who can borrow into people's bodies and take them over to be his own while they're still alive.
- Fabius Bile is shown pulling this on a large number of Space Marines in the Horus Heresy novels. Only one or two retain some fragments of sanity after the mad Apothecary finishes tinkering; the rest are little more than rabid killing machines.
- The Necrontyr were once a sentient organic species, but long ago had their consciousnesses uploaded into robotic bodies, becoming the Necrons. Among other things, this cost them their souls, which were devoured by their gods. Some Necrons have further afflictions: the relatively simplistic method that was used to transfer most of the civilians into their bodies left them as little more than automatons, while the Flayed Ones have been driven mad by the loss of their mortal bodies, and seek to recapture the sensations of life by garbing themselves in the flesh of the living.
- The Haemonculi fleshcrafters turn some of their prisoners into Grotesques, massive hypertrophied things with iron plates fused over their faces and weapons grafted into their limbs. They are treated as Cannon Fodder in battle, and frequently used against their own species. Given how the Dark Eldar feed on physical and emotional anguish, it is quite likely that Grotesques retain their original minds but are trapped in bodies no longer under their control.
- For an extra dose of Nightmare Fuel, we have the Wracks, Dark Eldar who willingly let a Haemonculus turn them into lesser Grotesques. Some of them treat this as an apprenticeship, hoping to become Haemonculi themselves, but many are just bored with their decadent lives and want to spend decades as horrific abominations.
- Your player characters qualify as this in White Wolf's Changeling: The Lost for the New World of Darkness. Each and every changeling was once a human man or woman, until the day that The Gentry stole him or her away to Arcadia. There, they slowly lost most of their humanity and became bizarre faerie creatures themselves. The ones who managed to trick, sneak or fight their way back to Earth are the lucky ones; they still have something of a human mind left. Others remain in Arcadia until there's nothing human left — there's only the faerie. Even those lucky escapes aren't really human, physically, they're just wearing an illusionary cloak of being human called the Mask. And their mind is still rooted in Arcadia's madness, so they're slowly becoming less and less human mentally, anyway.
- In Geist The Sin Eaters, the titular Geists are alien and horrifically inhuman monsters. Except, really, they're actually very old human ghosts who have fused with an Anthropomorphic Personification of death.
- All of the Feldragons in Arc Rise Fantasia are heavily implied to be people of the Divine Race exposed to hozone without a dragon gem to protect them. Those that aren't Divine Race turned dragons are implied to be the results of Ignacy's experiments on Common Race people, including orphans.
- Dark Souls and Demons Souls are made of this. Pretty much every hollow you ever face is a human that gave up hope. Not only that but many of the bosses and all the black phantoms also qualify. Poor Artorias.
- Crewman Norris in Shin Megami Tensei: Strange Journey. He begins hearing voices as you begin exploring Sector Bootes, and then he reaches for the sector's central tower, the Palace of Pleasure. Next time you see him, he's being experimented upon, and the transformation ain't pretty. Worst part is, you can see how he slowly loses his mind as you traverse the sector.
- From the same company, the Hito-Shura. Ordinary High-School Student one moment. Godslaying Bad Ass Humanoid Abomination the next. Despite relatively few physical changes (only a horn in the back of the head and glowing full-body tattoos) Word of God is his entire body has become a demon's - the horn is actually a primitive brain or sensory organ allowing him to truly interact with demons, and the tattoos are actually subdermal streams of demonic lymph.
- And the victims of the Demon Virus in Digital Devil Saga all used to be humans. After infection, they gain a demonic side capable of manifesting through their bodies, spanning the whole range from a lowly slime to a gigantic dragon; either way, it hungers for the flesh and blood of man. It's necessary to keep the demon well fed and content, or it will slowly start eating at the infected person's mind, devouring the human identity and leaving the starved, crazed demon permanently in charge.
- Virtually all the monsters from the Resident Evil series (with the exception of a few based on animals) are humans infected with various viruses or parasites.
- The ghouls in the Fallout series. Apart from looking like corpses, they're not really very different from humans (they're more resistant to some drugs and they may live much longer), but some go mad, becoming Fast Zombie-esque "Feral Ghouls". Super Mutants are an even straighter example, as they actively kidnap humans to infect with the FEV (Forced Evolutionary Virus).
- Dead Space. Every single enemy you fight was once a human; even the significantly larger bosses are made of dozens or even hundreds of human corpses joined together into one big mass. The Lurkers are encountered just one room after a datapad with a list of the month's births, confirming that yes, these were somebody's babies before they were murdered and transformed, just like the grown-ups.
- The sequel introduces the Pack, a form of zombie made from prepubescent children who hunt in groups.
- City of Heroes has several, notably the Devoured, the Hamidon, the Rikti, and as you find out in one story arc, Malta's Titan robots..
- The Hamidon is definitely the worst case, being an amoeba the size of a city block, created through some terrible fusion of genetic engineering and dark magic, with maybe some divine empowerment thrown in. Eldritch Abomination comes to mind.
- The Dark Astoria arcs feature the Sentinel of Mot, who was once Marcus Valerius.
- An in-universe theory toward the Thorn bloodline of Bloodline Champions.
- This is fairly common in the Warcraft universe. Notable is the Demon Hunter Illidan Stormrage, who, after using a demonic artifact to gain power, was transformed into a demon.
- Illidan's got nothing on, well, every race on Azeroth AND beyond. Firstly, those that play it straight:
- Naga used to be Night Elf Highborn who were transformed by their queen, Azshara, when their city was sunk into the sea during the Sundering.
- The Broken, the Lost Ones, and the Eredar are all degenerated versions of the Draenei who were mutated by over-exposure to fel energy.
- The Forsaken were the humans who were stricken with a plague of undeath.
- World of Warcraft also inverts this when we discover that the Curse of Flesh caused mutation in many, if not all, of the Titan's creations. Earthen became dwarves, mechagnomes became regular gnomes, and Vrykul became Humans. These are all inversions since the transformations go from "monster" to man.
- There is a theory that Night Elves (from which all other elves are descended) descended themselves from Trolls who were exposed to the arcane energies of the Well of Eternity, once more inverting the trope.
- All but a small few of the demonic races were once regular beings that became so tainted by fel energy they eventually became full demons, usually caused by direct interference by the Burning Legion as an assimilation plot. Many night elves became full demons in the form of satyrs and many other races became part-way demonic such as chaos orcs and the felblood elves through similar corruption. The eredar are an odd case because the majority of the species became demons after siding with the Legion while a minority fled and became draenei, which is different because the previous cases had mainly the minority of their race become demonic.
- Only a few races like the Nathrezim are confirmed to be originally demonic.
- In Halo: Captain Keyes, when you eventually find him. He's been absorbed into a massive Flood organism, retaining enough sentience to contact you on your commlink through sheer force of will. Not to mention the fact that the Master Chief needs his neural thingywhatsit, requiring him to punch through what was left of his face into his brain. Hell, any human (or Covenant, if you consider alien races) that the Flood infects could be considered an example of this.
- In Halo 4, we find out that most of the Promethean Knights used to be human, who were harvested by the Didact to be made into weapons.
- Scorpion, from the Mortal Kombat series, was once Hanzo Hasashi, the leader of the Shirai-Ryu clan of ninjas. When their rivals, the Lin Kuei, slaughtered them, and their leader Sub-Zero killed him, he returned as a wraith fueled by a burning desire for revenge.
- Most, if not all, of the monsters from Clive Barker's Jericho.
- Kokiri are said to turn into the race of skullkids when lost. They're usually shown as more tragic enemies, you being able to talk with them as a child in The Legend of Zelda: Ocarina of Time.
- The same game mentions that Hylians would eventually be transformed into Stalfos when lost in the woods. Just as creepy, given that you actually meet a lost man in the woods who appears oddly gaunt and skeletal, and when you return from his fetch quest with what he wants, he's gone, and a Kokiri informs you he has become a Stalfos and seems positively joyed to claim eventually everyone lost in the forest will someday turn.
- All the NPCs in the Dark World of The Legend of Zelda: A Link to the Past, as the Dark World has the effect of transforming anyone who enters it into a form that matches his personality. Link, who in this game is apparently a coward who must overcome his fear, is transformed into a pink bunny rabbit without any means of protecting himself.
- Similarly, the Twilight in The Legend of Zelda: Twilight Princess turns normal humans into spirits, Link into a wolf, and does not seem to affect magic-users. Spirits (and Twili) will eventually transform into the inconsistently named "Twilit Messengers" (better known as "those screaming things that guard portals").
- Though they aren't actually monsters, Ezlo and Midna probably count.
- Done in at least two side quests in Final Fantasy Tactics A2. In one mission, a requester asks for help as he and his friends are trapped in a mine and is afraid he will become the ghosts that haunt the place. When you get there, you encounter a gang of ghosts and its leader weakly begs for help.
- In another mission, a requester asks for a Potion and Hi-Potion to treat some wounds/fatigue. When you meet the person, it's actually a zombie, but has retained enough sense and control to talk to Luso normally. When the zombie uses the Potion on itself, it winds up hurting itself and Luso has to stop it from drinking the Hi-Potion. That's when the zombie realizes it is dead and was wondering why clans were attacking and people at inns throwing rocks. Later on, you discover that the zombie is actually Frimelda, a former Blademaster. She fought battles with a Paladin and over time, he grew jealous of her success as a fighter while he failed to follow in her footsteps, so he drugged her and she became a zombie. You can heal her eventually and she will join your clan.
- One of the gifted somehow turned into a dragon, originally being a hume.
- In Golden Sun, the people of Bilibin wanted to build a castle out of wood for their queen. The tree that they put their axes into turned out to be sentient, and cursed all of the villagers of Bilibin and Kolima to turn into trees. Fortunately, this gets undone after his Heel-Face Turn.
- Hooray, we defeated the dragons! Wait... oh, crap.
- Necrid in Soul Calibur 2
Talim: What are you? ...you're human, aren't you?
- And for crying out loud, Nightmare.
- Subverted in the next game, when Siegfried is human again, and his armor lives on as the new Nightmare.
- And, of course, Lizardman.
- Raphael becomes infected with Soul Edge's evil and becomes some sort of vampire-like entity.
- Cervantes as a one time wielder of Soul Edge has been twisted into a ghost/zombie pirate.
- Subverted in SCV, when he becomes human once more.
- Charade and SCII Berserkers also count.
- Algol is another example.
- Don't forget Tira, who became a Malfested thanks to Soul Edge.
- Not literally a 'man' but close enough, Scorpiton from Patapon. He actually is Makoton, who sold his soul to a devil to avenge Aiton, a Zigoton you killed during the first half of the game.
- Dr. Nefarious from Ratchet & Clank, and despite the fact that he was once human, he hates humans with a passion, calling them "squishies" and other derogatory names.
- Stalkers in Half-Life 2 are humans taken prisoner by Combine forces for acts of rebellion or "simply being in the wrong place at the wrong time", according to Alyx. Their organs and genitalia are removed and their blood replaced with a saline solution, a metal plate welded over their "face" and a strong implication that they are rewarded for good behaviour with artifical limbs so that they can walk. Brrr.
- For that matter, the Combine soldiers themselves were once humans who have undergone memory replacement and had most of their organs replaced with cybernetic implants. The soldiers rise in rank by giving up more and more of their humanity. It's implied that all of the Combine's bio-weapons had similar origins.
- Final Fantasy X does this a lot. All the Aeons were human, and an optional superboss is a monk named Omega whose hatred of Yevon turned him into a gigantic, four-legged monster with the power to create novae.
- The most Disturbing / Saddest example however is Anima, who not only looked monstrous (a chained, gap-mouth giant corpse rising out a shell) but is Seymour's human mother, who basically had turned herself into one to give him the ability to return to his father's people. Now she rages at how evil he became.
- The fiends you fight in random encounters were once human souls. In fact, in the cutscene where the party reunites with Yuna in Home, you can see fiends forming from the souls of recently killed Innocent Bystanders in the background. And, of course, to top it all off, there's Sin, aka Jecht.
- Pretty much everybody in Nexus War: Demons, angels, undead, and several others. All were once human and have become utterly inhuman. Just about the only characters that don't fit this trope are Eternal Soldiers.
- StarCraft's Infested Terrans, which are a lot more open about it (since they're named, well, "Infested Terrans"). They're still horrific abomination suicide bombers, though.
- In StarCraft II: Wings of Liberty, an even more mutated form called "Aberrations" appears in a few missions. These get upgraded to a controllable unit in StarCraft II: Heart of the Swarm.
- Also from Heart of the Swarm, the unique Zergform Izsha, who serves as Kerrigan's equivalent of an adjutant and who can be charitably described as a "chitin-plated naga with claw-tentacles for hair", is eventually revealed to have been a Terran woman, a medic named Amanda Haley, who was mutated into this new form by the Queen of Blades when she sensed the woman's psionic potential.
- In Quake II and Quake IV, the majority of the enemies you face are people who have been captured and forcibly turned into cyborgs. Some aren't even turned into troops, they just get their limbs hacked off and used as scenery (but they still twitch and bleed when shot). In Quake IV, this happens to the player character, and you get to see it happen, from his point of view. Curious?
- In Knights of the Old Republic, rakghouls all used to be human before being bitten and infected. The player gets to meet some Outcasts and a terrified Republic soldier before they transform. Other parts of the EU use the rakghouls again, only this time there's a deranged Dark Jedi with a talisman that instantly transforms non Force-Sensitives into them. An old clone trooper holds out longer than most, but doesn't quite manage to kill her.
- Also invoked to describe the unusual nature of Darth Nihilus. Although he's been implied to be a Negative Space Wedgie, or even the hero's Enemy Without. All depends on who you listen to.
- Although not originally human, Sonic's were-hog form in Sonic Unleashed can be an example of the original mind/new body version.
- The Archie comics give us a much straighter example in Jules.
- Many Neopets characters like Edna the witch (now a green Zafara) and the Island Mystic (now a yellow Kyrii).
- Rapture's Big Daddies are revealed to be this in BioShock.
- In BlazBlue: Calamity Trigger, Arakune was once a person, [[spoiuler: A scientist named Lotte Carmine, more exactly]]. Litchi, an old friend of the person it used to be, hopes the original personality is still in there, but it doesn't seem to remember its previous life. Then it says her name...
- The trope's name was used word-for-word in Prince of Persia: The Two Thrones by the Prince to describe the giant, jawless boss he has to fight. And just like said boss, most of your enemies from the first and third game from the series are this.
- The Many in System Shock 2. It's really unnerving to having your enemy viciously assault you while screaming for you to run away or put them out of their misery.
- Silent Hill 3, possibly. "They look like monsters to you?"
- Dragon Age:
- The werewolves are humans suffering under a nasty curse, more progressive ghouls are humans, elves, or dwarves in advanced stages of the Taint infection, Broodmothers (who were, rather, once women), and Golems (who were living dwarves forged into stone soldiers by pouring molten lyrium through their eyes and mouth before hammering and chiseling them into the proper shape).
- If the Chantry's teachings are true, the first Darkspawn were this. The Dragon Age II DLC Legacy confirms them. The final boss of Legacy, the Awakened Darkspawn Emissary Corypheus, was one of the original Tevinter Magisters who tried to claim the power of the Golden City. David Gaidar has also heavily implied that the Architect from Dragon Age: Origins – Awakening is also one of these Magisters.
- Not truly a monster, but in Chrono Trigger, Frog used to be a human knight until being cursed with his current form. He doesn't let it get to him anymore.
- The Heartless and the Nobodies of Kingdom Hearts are composed of different parts of souls of people. While most are mindless, some retain enough sentience and knowledge of their past lives to lament their fate.
- Dawn of War: Dark Crusade invokes this with Macabee, an archaeologist who awoke things best left undisturbed and was turned into a Necron Pariah. When another race assaults the Necron stronghold, Macabee notes "I was like you, once, clinging to life and blind to the truth... deep in these catacombs, I was remade..."
- In the Diablo games, Humans possessed and altered to fit their shape by the Prime Evils, through Demonic Possession. Diablo's body turns back into that of Prince Albrecht in the first game when he's killed, and in Diablo II, all the Three Evils are in the bodies of possessed humans, which turn more and more monstrous in irregular stages.
- Parasite Eve 2 is a more nightmare fueled version than usual: every single one of the monsters in the game were people who worked on the "Second Neoteny" project, which was a project intended to transform large numbers of humans into monsters. Humans who VOLUNTEERED for the project. This makes the monsters even more horrifying, since once your attention has been called to it, you can easily see how they were altered from their original human form.
- Made even worse when it is revealed they used the Heroine's DNA to make start the process to begin with. So even the monster-part came from a human as well.
- In Wario Land 3, all the monsters in the game were humans transformed by the Hidden Figure.
- Pokémon Black and White has the Ghost Pokémon Yamask (and, by extension, Cofagrigus), whose mask is its face from when it was human. Its Pokedex entry states that 'it sometimes looks at its mask and cries'.
- In a similar manner to the Legend of Zelda examples above, ''Pokémon X and Y" gives us Phantump, who, according to the Pokédex, is formed when the spirit of a child who died after getting lost in a forest possesses a tree stump.
- Phantasmagoria: A Puzzle Of Flesh reveals that the Hecatomb was a human beingnote that transformed into a monster - one that retains only vaguely human-like characteristics.
- The Black Knights in 11eyes underwent an Emergency Transformation courtesy of Misao. As Misao is the only one of them technically alive, she's also the only one that can change back. It doesn't help that they're wearing the monsters of the Red Night as a sort of living armor.
- In King's Quest VI the Lord of the Dead was a man long ago, chained to the throne of the Underworld and enslaved as its ruler. The throne and his witnessing of unending tragedies slowly drained away the man's humanity and transformed him into something beyond comprehension.
- In Dragon Quest IX, the entire Gittish empire.
- In Portal 2, it's revealed that GLaDOS is less of an artificial intelligence and more of a human one; having been the product of Brain Uploading the consciousness of Cave Johnson's secretary, Caroline. Cave originally intended to upload himself, since he was dying, but told his staff that if he died before they finished figuring out how to do it, they should do it to Caroline instead, whether she was willing or not, so that she could run Aperture Science in his place.
- In inFamous 2, the swamp monsters were once humans, transformed by Bertrand. Bertrand himself can also change into a gigantic monstrous form.
- In the Game Boy Advance and PSP versions of Final Fantasy IV, Cecil's trial in the Bonus Dungeon includes a potential encounter with a Goblin who insists that he used to be human, and that the curse on him will wear off shortly. Indeed, if you don't attack him, the battle automatically ends and a man is standing where the Goblin was (killing the Goblin causes Cecil to fail that part of the trial, of course.)
- In Super Robot Wars Z2: Hakai-hen, The Dimesional Beasts are people who were fused with their mecha by Gaiou. The Reveal comes in 49.
- All of the main characters in Final Fantasy XIII are normal humans who were turned into l'Cie (servants of fal'Cie, the providers for Cocoon/Gran Pulse), which grants them strength and magical powers, as well as resulting in them being ostracised by the people of Cocoon. Also, it is revealed early on that any l'Cie who fail their task are turned into Cie'th, deformed crystal-covered monsters who wonder the world until they eventually lose their will and turn to stone. And even then they are still alive, and awake and suffering.
- Version 6 of Ao Oni has three of the four main characters converted into one of the monsters when they were killed.
- At the end of Magical Girl Lyrical Nanoha As Portable: The Gears of Destiny, the Unbreakable Darkness, the Eldritch Abomination that the cast had been fighting against for the entire game, is revealed to have once been a human named Yuri Evelvine.
- The Elder Scrolls:
- The Elder Scrolls III: Morrowind has the ash and corprus creatures. The former have been twisted by the magic of Dagoth Ur into humanoid abominations and the latter are infected with the corprus disease, slowly turning them into leprous zombies.
- The Elder Scrolls V: Skyrim has the Falmer, former Snow Elves who after losing a war against humans sought refuge with the Dwemer, a technologically-advanced race of underground elves.As part of the contract the Falmer agreed to eat a fungus which casued the lose of their eyesight and to become enslaved by their kin.Not only did the Snow Elves degenerate into something like Morlocks, but what the Falmer went through fundamentally changed their very souls; theirs can be trapped in normal soul gems like any other beast, while sentient beings like humans or elves require black soul gems.
- A major part of the Reapers' modus operandi in the Mass Effect series. It begins with their Husk grunt troopers in the first game, which are augmented by variations and husks made from alien species in the others. But the crowning achievement is the revelation in the climax of the Suicide Mission that Reapers are made by pasting up sapient species and implanting them in metallic superstructures — and their next target is humanity.
- The Collectors in Mass Effect 2 were originally Protheans the Reapers transformed into slaves.
- In Mass Effect 3 basically every major sentient race (save the quarians) gets their own monster version that they can be turned into. Add a couple of cross breeds for the charm.
- In Little Samson, Kikira the Dragon Lord, Gamm the Rock Lord and K.O. the mouse were all human once, but were transformed for various reasons. This is All There in the Manual and is nowhere brought up in the game.
- X-COM: Terror from the Deep has the Bio-Drones, whose UFOpedia entry reveals that they're actually made from living human brains that had been tortured to submission.
- The ultimate villain of the Baten Kaitos games, Wiseman, is implied to have been a human sorcerer who desired power so much that he abandoned his own humanity to obtain more.
- The faced Mechon in Xenoblade are eventually revealed to be Humongous Mecha piloted by Homs put through Unwilling Roboticization. It's implied subtly early on by minor antagonist Xord, but it doesn't really hit until the party cuts open one... only to find Fiora, the protagonist's supposedly-dead childhood sweetheart inside. It also explains why the Monado can't hurt them: the Monado can't hurt Homs, and Faces are Homs.
- After beating the final boss (and if the area preceding the final boss wasn't a clue of it already), Alvis reveals to Shulk that Zanza was once a human scientist (human as in you and me, not Homs) who wanted to become a god. Meyneth was also a scientist working with Zanza.
- The remake of Non-Human for Action 52 Owns. The titular creatures are horribly-mutated monstrosities, created when Dr. Murdon flooded a nearby village with mutagen.
- Fable and its sequels are heavy on this trope. Balverines are humans that got bitten, and hobbes are children whose souls were devoured by dark nymphs.
- Fable The Lost Chapters implies that this is how Jack of Blades operates, as he possesses people through use of his mask until he finds another host body. His dragon form is his true form, however.
- Many of the creatures you encounter in Fallen London were once men. Then, in many cases, they made deals with the Masters of the Bazaar...
- Don't Starve has Webber, who's Half-Human Hybrid of a spider. Since the spider tried to eat him while he was still a boy, it accidently merged with him.
- In Blood Omen, Dark Eden features several such monsters. When Kain first encounters one on his way there, he narrates;
The poor wretch was warped beyond recognition. To think that it was once human. ... Such strange creatures that had been spawned by this dark magic; things half insect and half mammal - human torsos grafted onto abominations of the flesh. Sick as it was, I could not help but admire its creator’s ingenuity.
- In Akatsuki Blitzkampf, this is what led to the creation of Blitztank. It begins as your typical mecha robot, but after they fight Akatsuki they start to slowly form words and trains of thoughts...
- This is implied to be the case with Five Nights at Freddy's 2's Marionette, as one of the post-mortem minigames shows a crying child outside Fredbear's Family Diner being murdered by the Purple Man, seconds before the Marionette lunges for you out of thin air. The Marionette's face resembles a mime or clown's, in that it's crying. Crying purple. Whatever it was before, it's... something else, now.
- Although (at the time of writing) it isn't even out yet, Bloodborne already has its own Nightmare Fuel page, due almost entirely to this trope.
- The Rats from Borderlands 2 are spindly bandits with cannibalistic tendencies. Their origin is shown in a series of side-missions in Borderlands: The Pre-Sequel!; the first Rats (referred to as Boils by the unaffected, though an ECHO message refers to one as a Rat) were Hyperion personnel infected with parasites made by a worker named Lazlo under orders from Colonel Zarpedon.
- The page image is from Nedroid, "Face It".
- Bogleech: I was two men!
- Demons in Dominic Deegan Were Once Men; we get to see some of the transitions. Most notable, of course, is Siegfried, whom we knew rather well before his death. ( In fact, he was the second recurring character to be introduced.) From this to this to this.
- Addressed in The Fancy Adventures of Jack Cannon; as a combined punishment-and-strategy, Frankie is turned into a monster, shaped roughly like his old human self, but bigger, stronger, and uglier, with glowing red eyes. Gavin remarks that the eyes were a mistake; they made him too monstrous, making him easier for Jack and his family to deal with. Gavin restores his original human eyes so that the next time they make him fight someone, his opponents will be thrown off balance.
- El Goonish Shive has Aberrations. We've only met one on-screen, but he no longer looks human. At all.
- Yu Gi Oh Card Game Gusto Fan Comic: Apparently, the Gishki fishmen were once members of the Ice Barrier, but were changed into their current forms using dark magic.
- Zhor from Drowtales Ariel's father was once a Dark Elf, but was turned into a Giant Spider to save him from life threatening injuries. He's been like this for centuries. As of Chapter 44, the local Mad Scientist clan restored his original body. Zhor is confined to a wheelchair and has trouble speaking since he's not used to being a Dark Elf again after spending hundreds of years as a spider.
- The Overfiends in Heart Core were once humans and other mortal creatures before they commited certain acts of evil, turning them into powerful demons that were taken under Royce's wings.
- In A Witchs Tale, Aquell was once human, but Alice needed her power and turned her into a mermaid in exchange for Oceria helping in the war.
- The trolls from Stand Still, Stay Silent used to be human. Look carefully.
- The SCP Foundation's SCP-835 (squick warning) as revealed in the uncensored report.
- All the monsters in Ruby Quest
- According to his song, Trogdor was originally a man, but then turned into a dragon-man before finally becoming a dragon completely.
- Web Serial Worm features Mannequin, once a meek Gadgeteer Genius striving to avert the Reed Richards Is Useless trope, now a member of the villain group called the Slaughterhouse Nine, encased in a special protective suit of armor that features retracting blades, unnatural ranges of movement, and detached limbs that he can swing, throw or fire from his suit using chains. Topping it off, he may only be a brain and a few organs that fit in the armored torso. And he did it all to himself. The Endbringers might fit this trope as well.
- Pretty much all the minions of supervillain Dr. Macabre in the Whateley Universe. He kidnaps teens, transforms them into monsters, and forces them to do his bidding. The one captured by the police is a girl who is now mostly ghoul: she has a mouth full of needle-sharp teeth and requires human flesh to survive, despite everything she has tried.
- The ending of the second part of Bee and Puppycat might hint that Puppycat was the cursed human in the fairy tale he told.
- The creepiest part of Ben 10: Alien Force is the revelation that the DNAliens were all once humans who had brain slugs put on their heads. It's never really addressed after "Max Out", which was the most serious and darkest episode of the entire series, though.
- Except for one where an amnesiac man who can only recall being taken by the aliens turns out to be a disguised DNAlien and is restored to being a human again at the end of the episode.
- In one episode of Invader Zim ("Gameslave 2"), the rat people in the labyrinthine parking complex Dib gets lost in claim this happened to them, but Dib is unconvinced. A female one actually says "I was once a man," causing Dib to respond, bewildered, "But... you're a woman."
- Parodied in Sealab 2021, in which a talking tree cobra claims "I was once... a man!" before saying "Just kidding, I've always been a snake."
- After Cobra Commander gets hit with altered fungus in G.I. Joe: The Movie and starts turning into a snake, all he can hiss is "I was once a man!" until the transformation is complete. Definitely the Trope Namer and what Sealab referenced in the above quote, despite not being "human" in the first place in this continuity.
- Although he got somewhat better in the series immediately following the movie with some assist, which justified in story the Power Armor he wore.
- Windfang, Wrath-Amon's literal Dragon from the animated series Conan The Adventurer. Once a famed general, he was taken prisoner during a battle in Stygia and transformed by Wrath-Amon. His wife-to-be ran from him in horror, leaving Windfang with nothing but 200+ years of servitude to the evil wizard. Wrath-Amon's second lieutenant Skulkar also was a human before a double whammy of sorcerous empowerment and necromantic curse turned him into and undead horror; unlike Windfang, though Skulkar definitely prefers being a monster (the episode with his backstory is also the one where he gets temporarily remade human, which horrifies him).
- On the heroic side, Greywolf's brother and sister also were cursed into wolflike monsters under a villain's control (although fortunately by the end of the episode their curse was mitigated into them being intelligent free-willed wolves for most of the rest of the series). Also, in one episode where Conan gets sent to a Bad Future, we see what happens when Jezmine's serpentman heritage is brought to the fore; she later turns into a giant snake in a Heroic Sacrifice to hold back Set so Conan can escape him - and then Fridge Horror hits you as to exactly why she would have that ability when she screams at Set as she "scales up" that she'd never let him touch her again...
- Generator Rex. After the Nanite event, every living thing was infected by nanites. Many EVOs were human at one point. And any one can go EVO at any time. And the only one who can cure them is a teenaged boy, and sometimes not even then.
- About half of the mutants in Street Sharks, with the other half being sea creatures-turned-mutants. The good news is that the mutations pretty much can't change one's free will, so fewer humans are gradually transformed by the Mad Scientist.
- Not true...the bad guy's working on a formula to make them under his control. He just keeps having the test subjects escape...
- The Big Bad, Skeleton King from Super Robot Monkey Team Hyper Force Go! was once a kind-hearted man called the Alchemist, who in fact was the one who created the monkey team to combat the monster he became. What makes his case really sad was that his transformation wasn't by choice.
- In an episode of Futurama, Leela encounters an octopus-like creature in the sewers that claims (in a deep, growly voice) that it "used to be a little blonde girl named Virginia".
- In Teenage Mutant Ninja Turtles 2003, the Turtles find an underground community of monsters who were once human, victims of the Foot Clan who were transformed into these creatures to mine valuable minerals. They get lucky, however; it takes many episodes, but Donatello is eventually able to find a permanent cure.
- Of course, since mutants are one of its main concepts, the trope appears in some way, shape or form in pretty much every iteration of the franchise.
- In the Adventure Time episode "Holly Jolly Secrets", it's revealed that the Ice King was a normal human man named Simon Petrikov until he bought an old crown and tried it on. He was driven insane by the visions the crown produced, heard voices telling him the secrets of ice and snow, and was physically changed into the frigid, blue-skinned Ice King. The final moments of the video depicting his descent show his desperate plea to stop him from hurting anyone while he tries to overcome his growing insanity.
- In "Finn the Human", it's revealed that the Lich was apparently a normal human who was mutated by the Mushroom Bomb's fallout into the undead Omnicidal Maniac we all know and fear. In "Jake the Dog", the alternate universe Jake is transformed into the Lich instead.
- In an episode of the 1990s Silver Surfer animated series, the Surfer and a group of researchers come across an enormous green blob monster on a universal library planet built by Precursors. It's the precursors (and the crew of a pirate ship) themselves after they devolved into this form and linked up with each other in a hive mind of knowledge.
- Played for Laughs in the Looney Tunes short "Mutiny on the Bunny". A horrid-looking and clearly insane man runs down the gangplank from Yosemite "Shanghai" Sam's ship and has just enough time to turn to the audience and declare "I was a human being once!" before running off screaming into the night.
- Said by Walter Lankoswski (aka Sasquatch) in the 1996 animated Incredible Hulk TV series near the end, after choosing to exile himself from humanity after he's permanently transformed and injures a child while fighting the Hulk.
- Samurai Jack; the title creature from "Jack and the Lava Monster" was once the king of a prosperous land until Aku attacked. Amused by the king's attempts to fight back, Aku imprisoned him in a stone for eternity. The king found a way to from the rock around him into a giant body (thus becoming the Lava Monster), and can only be freed and allowed to pass on to Valhalla if he is defeated in honorable combat by a mighty warrior.
- In Steven Universe, it's eventually revealed that the gem monsters the main characters fight are actually corrupted Gems.