- Mutation Horror: slowly accumulating chaotic mutations. The victim gradually becomes increasingly twisted and deformed due to the growing influence of The Corruption, exposure to nuclear waste, Mutagenic Goo, or The Virus. There is no "end form", only ever-increasing levels of Body Horror usually involving asymmetric and chaotic changes and tumorous growths. This variety tends to end in either death, Face Monster Turn, or the victim's best attempts at screaming.
- Horrifying Metamorphosis: Slow Transformation into a known end form. Often part of the Viral Transformation process or a particularly unpleasant form of Metamorphosis or Baleful Polymorph. The victim experiences a disturbing slow change into his new form. The end result does not have to be body horror, but the process of adopting an entirely new body plan is likely to involve quite a bit of body horror.
- Traumatic Transformation: Rapid Transformation into a known end form. Some transformations condense all the horror of a targeted slow transformation into a brief, squicktastic Transformation Sequence. Often emphasizes the face and visibly reshaping skeletal structures, and is usually accompanied by the sounds of popping bones and rearranging organs. Nearly always painful or disorienting. Common in Darker and Edgier Animorphism: The transformation of a werewolf, for instance, when portrayed realistically. note
- Terminal Mutation: Targetless and Fast. A particularly nasty Cruel and Unusual Death involving rapid degeneration or mutation until death. See Rapid Aging, I'm Melting, and Shapeshifter Swan Song for just a few of the possible causes. Examples of this form should be placed on their respective pages unless they are particularly noteworthy as transformation horror as well.
- Mix And Match Mutation: Sprouting Combat Tentacles or a Shapeshifter Weapon can be disturbing enough, but when more and more are added to the mix you have the recipe for a Shapeshifter Mashup. Even more horrifying if it's involuntary, such as in the case of Power Degeneration, or an Adaptive Ability going totally haywire.
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Anime and Manga
- In Naruto, this happens when Naruto goes into four-tails mode, especially when his skin peels off.
- This happens to Tetsuo in AKIRA after being wounded by Kaneda during their fight at the stadium, as Kaneda tries to finish him off he starts twitching and moaning in pain when suddenly his mechanical arm bursts open and sprouts tentacles, he becomes gigantic and bursts out of his clothes, and he mutates into a massive blob creature that consumes everything in his path including his girlfriend Kaori and he is unable to control himself.
- In Princess Tutu, Rue's Transformation Sequence into Princess Kraehe involves lots of thorns and pain...
- Whenever the ponification process is described in The Conversion Bureau: The Other Side of the Spectrum, it's going to be this. However, it's not a free action - Mercy Kills are a common sight in the fic and its side stories, and Amputation Stops Spread. Special mention goes to the trials for the Flawed Prototype versions of the potion, which were so shocking and horrifying beyond words that it's almost impossible to fully describe.
- Although it isn't shown on screen, Lyra being turned into a human by a miscast spell in Helping...Hands? clearly qualified as a Traumatic Transformation, especially given Trixie's description of Lyra's new form. And her transformation back into a pony is described, in gruesome detail.
- Jade Chan in Webwork takes eight long, painful and humiliating years to transform into a spider demon. Parts of the change being so painful that she has to be placed in a coma to avoid the pain of her skin and bones melting while she grows an exo-skeleton. The initial act that started the change is so graphic that the author marked the section where is starts and ends so readers can skip over it.
- Lampwick's transformation into a donkey in Pinocchio. He initially doesn't know what's happening at first (and even Pinocchio thinks it's the booze), but once he does, he begs Pinocchio for help, calling out helplessly for his mama before he devolves into a wild, braying, panicked mess.
- An American Werewolf in London almost single-handedly popularised this tropes' connection to werewolves.
- In District 9, Wikus slowly transforms into a prawn.
- The Howling. Another particularly graphic example werewolf transformation, with the squick factor turned Up to Eleven thanks to effects artist Rob Bottin. His next gig would be The Thing (1982), widely considered a crowning achievement in body horror effects.
- In The Matrix, any human possessed by an Agent transforms into that Agent's appearance in a Silly Putty–style rearrangement of anatomy. Taken Up to Eleven by Agent Smith's Clone by Conversion ability in the later films, as the process takes place much more slowly and the victim appears to be fully aware of the fact that they are being overwritten by the Agent as it happens.
- Played for Laughs on A Goofy Movie, where Max dreams that he's turning into... his father.
- The trailer for Dracula Untold, shows us a close-up glimpse of Vlad's face peeling and shedding away during his transformation into a Vampire. This is a case of Trailers Always Lie as this happens when he is exposed to sunlight later in the film.
- In Penguins of Madagascar, the Medusa Serum turns penguins into hideous creatures with mismatched body parts, extra eyes, and other deformities.
- Willow: Of the Horrifying Metamorphosis variety, when Queen Bavmorda magically transforms an entire army into pigs. It's made explicit that the transformation doesn't affect what the victims are wearing, making a slow, painful process worse with constriction by clothing and medieval armor as they change shape.
- Invoked and inverted in Animal Farm: The other animals are horrified to watch the pigs, who were satirical allegories of Communist dictators, gradually become indistinguishable from the humans they overthrew, though the pigs barely seem to notice.
- Animorphs. Many, many examples throughout the series, played straight to the point of a Black Humor Running Gag. Most of the Animorphs freak out the first couple of times they try particularly exotic morphs, but after a while they get used to it. Shining examples include:
- Fish: You lose all your limbs and frequently spend a few moments either underwater with lungs or out of it with gills, and on at least one occasion a character spent several seconds with neither.
- The undiluted Transformation Horror of insect morphs. One has to become a Giant Insect/Human hybrid for the duration of changing from a human to an insect. (See The Fly if it hasn't hit you why that's horrifying yet.) Also, note that insects don't have eyelids, and frequently do have panoramic vision, so you have to watch it happen.
- The defiance of this trope is Cassie's, and one Andalite character's, talent. Rather than looking like several crimes against nature she can make the transformation nice to look at, even beautiful.
- In Black Bullet, this happens whenever some poor sap transforms into a Gastrea. His body bulges unnaturally as he transforms.
- H.P. Lovecraft's The Shadow Over Innsmouth. The hybrids become more and more like their Humanoid Abomination relatives as they age.
- Invoked in the Discworld novels: Angua absolutely forbids anyone to watch her while she is transforming from human to werewolf and vice-versa. Especially her lover Carrot, on the grounds that what he may see could put him off her for life. One man who did watch ran away, and went to sea to put the terrible sight behind him.
- Thinner by Stephen King: An obese lawyer begins losing weight after hitting a gypsy's daughter with his car. The friends who help him cover it up develop their own body issues.
- In The Southern Reach Trilogy, expedition members entering the Eldritch Location Area X are warned to avoid "contamination" in vague, unspecified terms. They only learn the exact nature of the contamination when their bodies begin transforming. Most turn into animals similar to the existing local wildlife, but sometimes the process goes wrong and results in a hideous abomination.
- The Change that werewolves go through in Red Moon Rising. It involves multiple bones breaking, permanent disfigurement that lasts even into human form, and is incredibly painful. The fact that it takes place in strict and militant government compounds certainly doesn't help.
- Eden Green graphically depicts most varieties of transformation horror; the central theme of the book is Horrifying Metamorphosis. In addition, the rationalist main character imagines many possible scenarios in which the needle symbiote can ruin a person forever.
- The Outer Limits (1995):
- "Quality of Mercy": During a future space war, a female cadet is locked up with a Major from another division when they're both captured by the aliens. The aliens start to transform her into one of them so they recruit her and use whatever useful knowledge she possesses, and her body gradually mutates further. Until the ending reveals that they're changing her back, and she was sent to spy on the Major so that he'd reveal the location of their forces.
- "The New Breed": A man injects himself with experimental nanotechnology to cure his pelvic cancer. The problem is that they don't stop there, or even at healing old scars and adjusting his eyesight so that he doesn't need glasses anymore. For instance, they interpret his inability to breathe underwater as a physical weakness, and he develops gills. It only gets worse from there.
- Raven and Chelsea slowly turn into cows in the Halloween episode of That's So Raven. They don't exactly take having long pointy ears and white, furry tails very well...
- In the first episode of the second series of Misfits, the shapeshifter's transformation sequences involve her clawing at her face and screaming in agony as the lights of the locker room flicker behind her. Made more unsettling by the fact that her eyes turn completely black in both pre- and post-transformation forms.
- The New Orleans swamp-dwelling Roux-Ga-Roux werewolf changes between its forms by ripping its own skin off, revealing the skin underneath.
- Celtic Mythology's Cú Chullain had an ability called "Warp Spasm", which basically made him The Incredible Hulk, but with a Nightmare Face. Standard "go from a regular guy to a beefy mass of Unstoppable Rage," with a side order of Eye Scream-one eye would swell until it popped out on the nerve, the other would shrink and recede into his skull. His mouth split (whether like mandibles or Glasgow Grin I don't know), his temples swelled up, his knees reversed orientation, and his hair got spiky.
- In Warhammer Fantasy and Warhammer 40,000, notable servants of Chaos tend to accumulate mutations as rewards (or punishments) from the Chaos Gods, and/or through exposure to raw Chaotic energy. Some of these mutations have a clear end goal, like the champion taking on the appearance of one of their god's daemons, but others follow no set pattern. Those who have received too many "gifts", or have fallen out of favour with the gods, risk devolving into insane, shapeless horrors called Chaos Spawn.
- Most of the early-mid game opponents in Bloodborne are some kind of werewolf-like creatures, who clearly were once men. When encountering Vicar Amelia, you actually get to see how exactly the transformation goes; and even a Gory Discretion Shot can't hide the fact that it isn't pretty.
- Traumatic Transformation happens when you put on the Deku, Goron, Zora, or Fierce Deity masks in The Legend of Zelda: Majora's Mask. Thank goodness it's possible to skip them after you see it for the first time.
- This trope is the main problem faced by the characters of Pandora's Tower. The protagonist's girlfriend, Elena, has been cursed to turn into an Eldritch Abomination, and the main goal of the game is to stop it before it's too late. The horror part is in full effect here, with the transformation growing more gruesome every second you waste.
- The Dead Space franchise is largely built around this trope: all of the Nightmare Fuel that's trying to kill you is the result of a mutagenic plague commandeering recently dead bodies for arts and crafts projects. The kicker is that we learn in Dead Space 2 and 3 that you just have to be mostly dead.
- Erazor Djinn while he transforms into Alf Layla wa-Layla in Sonic and the Secret Rings.
- Final Fantasy VII's resident Mad Scientist Dr. Hojo, and what happens to him when he downs one of his serums when Cloud and Co face him. Back in the day when FF7's graphics was top of the line, this looked horrifying.
- Many Sorceresses in Final Fantasy VIII appear to slowly mutate into no particular end form. One unnamed Sorceress boss looks less like a human being and more like a giant grub. Ultimecia's (quickly changing) One-Winged Angel forms deserve a honorable mention: first she fuses herself with a giant lion-like beast, and later turns into a form no less repulsive than the aforementioned grub woman.
- During Parasite Eve series Square again provide graphic depictions of this trope in their high-quality CGI movies, starting from rats, and ending with humans. That German Shepherd from first game deserves special mention. Poor thing.
- In Diablo II, the Wanderer's body has already been altering slightly due to his Demonic Possession, but in the cinematic for the final act, he goes through a transformation that an onlooker describes as "not meant for mortal eyes." At first, the skin on his face starts flowing, and then most of it is hidden as he transforms into Diablo in his full formnote .
- Runewriters: Severian and other shapechangers can turn themselves into various animals. This includes aberrants, the resident lovecraftian horrors. Watching someone turn into one on-panel is less than comfortable.
- This is a favorite trope of the SCP Foundation's community, and the collection contains many examples of all forms of transformation horror. Noteworthy examples include a sentient microorganism, The Clockwork Virus, The Seven Furs, and Gaia's Blood.
- Whateley Universe: Several of the students have experienced this to some degree or another due to their mutations, but four in particular stand out:
- Fubar, formerly 'Brainteaser', who had an encounter with... something... on the astral plane, which caused him to transform into a literally Lovecraftian creature which is unable to breathe air anymore. He's lived in a pool in the basement of Hawthorne Cottage for three decades now.
- Puppet, whose blood turned into a toxic green muck which is slowly killing her, thanks to a necromantic sacrificial ritual intended to turn her into the mage's super-powered catspaw. She has been on life support for over a year, as most of her major organs have shut down entirely, including her heart.
- Migraine, who attempted to use an experimental Devise to transform herself into an Exemplar, but instead was transformed into a Gigeresque insectoid monstrosity that was trapped in an immobile exoskeleton.
- Theophany, who, under the direction of a voice claiming to be God, transformed Folder into a girl with intention of making her his 'divine bride'. Folder's reaction when he attempted to consummate the marriage by force left Theophany looking like a crumpled piece of paper - alive, but horribly mutilated and distorted to the point that even Jobe was shocked.
- A .Gif file exists of a man doing the standard "Transform and Roll Out!" line from Transformers, and turning into an Organitek car- his spine and ribs pop out of his back to make him quadrupedal, his face tears into quarters to become the grille and headlights, his arms and legs become the fuselage, and it's best not to speculate on where the tyres come from.
- One episode of Danny Phantom has the main character trying to duplicate himself, only to horribly, horribly mutate himself: little heads on individual fingers, mouths for eyes, eyeballs sticking out and so forth. On the other hand, it is Played for Laughs.
- Men in Black: Alpha collects useful anatomy and additional limbs from alien species as he descends farther and farther into evil and madness. By his last appearance, he's pretty grotesque, and an excellent example of Mix and Match mutation.
- Spider-Man: The Animated Series. Poor Spider-Man underwent quite the horrifying metamorphosis into ManSpider several times in the "Neogenic Nightmare" arc, with each iteration being more severe than the last, eventually developed into full blown Mutation Horror. Later on, the Vulture absorbed Spidey's youth and powers... and also his unstable mutating DNA, meaning he sporadically changed fully or partly into the same creature.
- The Spectacular Spider Man has Connors' transformation into The Lizard, especially the part where instead of compressing slowly, his head partially implodes to form his new lizard head.
- In Street Sharks, this pretty much is what gene slamming is all about. Every time a person is turned into a fish/human hybrid, it involves them twisting around, screaming in pain. And since most of the designs involve the heads being directly fused to the bodies with no necks, it means that the transformation involves the subject's head changing shape.
- The Avengers: Earth's Mightiest Heroes! episode "Gamma World" has The Leader turn various people into gamma-irritated monsters. A few gruesome sights include the victims writhing in pain, The Wasp and Black Panther developing the features of their animal namesakes, and Iron Man's heart contorting.
- Garfield: His 9 Lives has the "Lab Cat" of segment 7 becoming a dog. In the original book it was scary but quick◊ but in animation it's a Painful Transformation that even resorts to only his shadow in the final takes.
- Steven Universe had Steven trying to learn how to use his shapeshifting powers, and his first successful attempt was to turn one of his fingers into a tiny cat head. Then another of his fingers into a second tiny cat head. Things escalated a bit out of control from there.
- Insects change form or size by shedding their skin and growing when their flesh is still supple. Sometimes this process fails. The results range from a bit odd to grotesque to downright Lovecraftian. And the insect's still alive...