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Parasitic Horror

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Parasitic Horror (trope)

"As the writhing, teeming mass of mindworms swarmed over the outer perimeter, we saw the defenders recoil in horror. 'Stay calm! Use your flame guns!' shouted the commander, but to no avail. It is well known that the Mind Worm Boil uses psychic terror to paralyze its prey, and then carefully implants ravenous larvae into the brains of its still-conscious victims. Even with the best weapons, only the most disciplined troops can resist this horrific attack."
Lady Deirdre Skye, "Our Secret War", Sid Meier's Alpha Centauri

Parasites are organisms which depend on feeding off living hosts for their survival. For sapient creatures such as humans, this is an inherently horrific concept as it violates all our ideas about bodily autonomy and how we interact with other creatures. While nobody wants to be Eaten Alive by a lion or a bear, "regular" predation is at least intelligible to a species of evolved hunter-gatherers. Parasitism registers as pestilential and insidious, not a normal part of the circle of life but some aberrant perversion of nature.

In fiction, this often takes on far more extreme forms, being infected by parasites the size of your fist, ones that take over all of your motor functions, or horribly mutate your body. It may be the offspring of some other lifeform implanted into you against your will, based off the similar behavior of parasitic wasps. Sometimes, they will get inside your body through Orifice Invasion, otherwise, they'll just burrow into your skin. In some cases, the parasite might even be both intelligent and malevolent.

Sub-Trope of Body Horror.

Super-Trope to Puppeteer Parasite, Chest Burster, Parasite Zombie, Parasites Are Evil, Womb Horror, and The Infested.


Examples:

    open/close all folders 

    Anime & Manga 
  • Manhole's story revolves around the Filaria, a fictional parasite that burrows its way into human brains and robs them of basic desires including appetite, sex drive, and even lethargy, prompting the victims to act purely on routine. For example, an infected housewife mindlessly chops food nonstop, not even noticing when she starts chopping off her own fingers.

    Fan Works 
  • Abraxas (Hrodvitnon): Two of Ghidorah's "children" cause this. When the Many are being injected into their first human victims, it looks like something is slithering under the body's skin. One of the unborn Zmeyevich kicking like a regular baby against its mother's belly is just a little bit more visible than is human.

    Film — Live-Action 
  • Alien (1979): The Inciting Incident is when a scorpion-like alien hatches and subsequently facefucks an astronaut. Shit officially hits the fan when the larvae it implanted tears its way out of a his chest cavity.
  • The Bay is a Found Footage Film that starts out as a documentary of the Fourth of July celebration at Claridge, Maryland, only for the town to succumb to a plague of a mutated species of Cymothoa exigua spawned from the polluted bay. They infect the people through the water supply and eat them alive and spawn until they die, where they escape their host and jump to a new one. By the end of the film, nearly everyone in the film had died after the US government quarantined it, the footage leaked by the reporter that survived.
  • Fantastic Beasts introduces a nasty concept into the Harry Potter universe: the obscurus parasite. These little monsters attach themselves to individuals whose magical abilities are out of their control or forcibly curtailed, and proceed to drain the magic from their victim, leading to a life of unbearable pain whose only consolation is that it's usually very short. As a side effect, the victim (called an obscurial) has no access to their magic, often leading the unaware to consider them a Squib. Fantastic Beasts: The Secrets of Dumbledore reveals that a character we'd known about for a very long time was an unusually long-lived victim of an obscurus: Ariana Dumbledore.
  • Growth is about an island that unwittingly hosts a secret government laboratory studying parasites. While they're intended to produce extremely big, shiny pearls, this is only a proof-of-concept. They are accidentally released, first infesting a creepy kid (who, does, as a matter of fact, have them swarming out of her eyes), then overrunning the whole island. The Cruel Twist Ending of the film shows that those pearls are actually their eggs, and they're hatching...
  • The Mummy Trilogy: Scarab beetles can quickly burrow into a person's skin and eat them from the inside out. They are especially fond of human brains.
  • The Ruins: The evil vine not only eats people (or drinks their blood), but it also infects them with spores which then proceed to grow inside the victim. One of the main characters ends up killing herself as she tries to cut them out.
  • Sputnik: The alien lives in the host's oesophagus and stomach, and secretes a toxin that knocks out the host and relaxes his muscles so the alien can exit via the mouth to hunt and feed, which it does every night. Once outside the body and ingesting oxygen it grows from a snakelike form to a multi-limbed Starfish Alien 1.5 metres in length. It's speculated that the alien is using the host as a spacesuit until it becomes fully adapted to Earth's environment, whereupon it will discard the host like a cocoon (turns out the relationship is symbiotic).
  • The Thing (both 1982 and 2011): The titular villain is an extraterrestrial single-celled organism that can infect its victims by mere touch and hides inside of them. If its cover is blown, the Thing creates a horrific pandemonium of meat, tentacles, and mouths out of its host's body. To hide and hunt efficiently, the Thing orchestrates paranoia to the heroes, causing them to accuse each other for being the alien menace.
  • The Ugly Stepsister: Elvira is seen as pudgy and her teacher offers her a way to fix that, giving her a tapeworm egg to swallow. Sure enough, she does and while becoming much thinner, also gets malnourished to the point her hair begins falling out, and even starts puking up tapeworm eggs.
  • Venom (2018) is a subversion of this. While Eddie is initially terrified by the Venom symbiote using his body as a host, and is especially horrified by his new diet of human brains, Venom is actually sentient and able to be reasoned with — and, as consolation, being his host also grants Eddie all kinds of cool superpowers. They grow to genuinely like and trust one another, to the point where Venom is hurt and angered by being called a parasite, insisting their relationship is mutually beneficial. By the end, Eddie's grown to like having Venom around, and offers the compromise that they only eat bad people, to which Venom agrees, allowing them to become a full-on Horrifying Hero.

    Literature 
  • All Tomorrows: On one world that resisted their invasion, the Qu punished the people living there by transforming some of them into an array of parasites. Some were tortoise-sized and ambulatory, others were fist-sized and lived attached to hosts, and there was even one variety that infested the wombs of its victims. Most of them went extinct after the Qu left, but one variety subverted this, as they went on to regain sentience and formed a symbiotic relationship with their hosts.
  • InCryptid:
    • Apraxis wasps sting prey (often humans) and lay their eggs in it, with the nymphs incubating in living or dead bodies, and absorbing the victim's mind into the wasp Hive Mind in the process. And even burning the body doesn't destroy the microscopic eggs, just puts them into the soil.
    • Alkabyiftiris slime is a Festering Fungus that acts as a Puppeteer Parasite to its hosts, with them still semi-conscious as it slowly takes over their body. After about an hour, the slime causes permanent brain damage.
  • A Little Vice: The seeds that empower the Beasts are this, and push the hosts towards their desired behaviour.
  • Other Covenants: In "The Sea of Salt", the yellow stars worn by the prisoners are actually starfish-like creatures feeding on them.
  • Things Have Gotten Worse Since We Last Spoke: The last parts of the book involve Agnes being convinced by Zoe to consume raw insect-infested meat, willingly giving herself a tapeworm in order to fulfill her desire to be a mother.
  • The Troop involves a parasite-based bioweapon created as a side-gig to a genetically engineered tapeworm diet aid. While the diet aid was meant to become The Symbiote, the bioweapon took all the bad things about them and cranked them up, and added a few more besides.

    Live-Action TV 
  • Babylon 5: The episode "Exogenesis" features giant centipede-looking alien critters who are shown sinking into the flesh and bonding to the spinal columns of assorted lurkers in Downbelow, where they seem to take control of their hosts' bodies. Contrary to what Marcus and Doctor Franklin initially think, the Lurkers aren't victims, but volunteers, and the alien critters are actually symbionts, sharing their memories with the Lurkers in exchange for the ride. Basically what the Trills from Star Trek would be if the Federation didn't know about Trills.
  • One episode of Earth: Final Conflict introduces a parasitic worm that burrows into the body of its host, making them completely unafraid of everything, up to and including death. However, after an hour, the parasite will kill the host.
  • The Expanse: In season 4, Holden and Amos are trapped on an alien planet with the other colonists and have sought refuge in the ancient artifacts. It later turns out that the water contains parasites which nestle inside their eyes, slowly causing them to go blind.
  • In one episode of Primeval, a flock of dodos manages to escape into a building in the present day. The dodos themselves are about as dangerous as you might expect, but they bring with them a highly infectious worm-like parasitoid that can also transfer to humans.
  • Stranger Things: The Mind Flayer manages to leave a bit behind when it injures El, which starts wriggling and painfully crawling around under her skin later. Jonathan has to cut her leg open and try to dig it out with his fingers while they're all hiding from the Mind Flayer.
  • Torchwood: In "Fragments", Owen's fiancee Katie manages to become infected with an alien parasite that incubates in her brain, giving her symptoms similar to early Alzheimer's. When threatened, the parasite is capable of releasing a gas that kills both Katie and the doctors operating to remove it. Needless to say, the scene where Owen and Jack burst into the operation room to find them dead and a starfish-like being on top of Katie's exposed brain is not a pretty sight.

    Multiple Media 
  • Star Trek:
    • Star Trek II: The Wrath of Khan features Ceti Eels, which burrow into their victim's head through the ear canal and attach themselves to their host's brain. This has the side effect of making their victims extremely susceptible to suggestion. Khan uses this to hijack the starship Reliant and force Captain Tarrell and Commander Chekov to lure Enterprise into an ambush. When Khan orders Terrell to kill Kirk, he's able to resist the eel's influence just enough to eat his phaser before Khan can force him to murder the Admiral.
    • The Star Trek: The Next Generation episode "Conspiracy" plays the parasites for various types of horror: firstly, they change people's personalities, secondly, they make people violent and super-strong, thirdly they themselves look pretty gross with their appendages sticking out of the person's neck, and fourthly, some of them breed in somebody's stomach, causing him to explode.
  • Ultra Series:
    • Ultraman: The Next: Beast the One, the Big Bad of the film is a parasitic, space demon who merges with a human host and slowly overrides their mind, body and finally, kills them altogether, absorbing its host into itself. It can do the same with other living creatures for the sake of augmenting itself.
    • Ultraman Z: Celebro, Big Bad of the series, is a space entity that takes possession of various organisms to carry out his evil plans. His possessions are shown to be rather unsettling as his body language shows signs of twisting the bodies and actions of those possessed to suit his needs and his possessions are shown as rather painful.

    Tabletop Games 
  • Blackbirds RPG: Those who gain the attention of the Child of Longing or are otherwise touched by her influence will often be afflicted with a horrifying transformation simply called the Change. The afflicted suffer a variety of symptoms from voracious hunger to memory loss, but the most viscerally horrifying is the innumerable flesh-eating Caoimhe moths gestating within their bodies. At its final stage, the victim is reduced to little more than a human bomb filled with the moths, magically kept alive and conscious while being trapped in an agonizing existence of waiting to explode while feeling thousands of flesh-eating insects crawl through their body.
  • Dungeons & Dragons:
    • Illithids (a.k.a. Mind Flayers) are parasitoidic, meaning their young can only (properly) mature inside a living host (when they don't, the result is a Neothilid), and kill them when they "hatch". In this case, the larvae eat their hosts brains over the course of around a week, and replace everything south of the nose with tentacles. It gets more complicated when different races get involved, but the basic concept remains the same.
    • Slaad come in two basic varieties (red and blue). Red slaad infect someone they strike with their claws with a slaad egg that will eventually hatch into a blue slaad than chews its way out of its host, killing them in the process (the process is a Shout-Out to the chestburster from Alien). Blue slaad inflict a supernatural disease with their claws that eventually mutates the victim into a red slaad if it's not cured. If the victim of either kind of slaad is an arcane spellcaster, however, the result is a green slaad that's smaller than a red or blue slaad but instead possesses magical abilities.
  • Pathfinder:
    • Boregrubs are parasitic worms that infest rotten wood and leap out when they sense suitable hosts (i.e., player-characters). Boregrub-infested doors are a common booby-trap in Haunted House-themed dungeons.
    • A certain Cthulhu Mythos-themed module has Dark Young of Shub-Niggurath born this way. They provide the host with immunity to mind-control for a couple of days before exploding out of their heads in a welter of gore and tentacles.
  • Warhammer 40,000:
    • The tyranids have several abilities involving weaponized parasites:
      • Devourers are a Living Weapon analogous to a heavy machine gun, which fires nerve-eating maggots.
      • The Hero Unit "The Parasite of Mortex" has a special attack that causes infantry units killed by it to be replaced with a Ripper Swarm, representing them being devoured from the inside out by the ravenous, larval bioform.
      • Mind-control worms are available as wargear.
    • The chaos god Nurgle, being a reflection of people's feelings of acceptance towards the bad part of nature, holds sway over parasites among other illnesses.
      • One of his daemonic gifts is a Beneficial Disease in the form of a huge parasite that makes whatever vehicle it infests more healthy (although this technically makes it a symbiote, it's still a huge worm suckling on the vehicle's Machine Spirit).
      • Those infected by his plagues often end up infested with maggots, either mundane or daemonic, that are attracted by the stench of the victims rotting flesh.
      • The Nurgle Champion Typhon has a mutation called the "Destroyer Hive," which resembles a termite mound growing out of his back. At will, it can disgorge a swarm of daemonic wasps.

    Video Games 
  • Aliens: Dark Descent: you can find a Data Pad of someone knowingly infested with a Chest Burster, who notes that her blood test has come back as a mess of exotic retroviri and prions. If being forcibly impregnated by a parasitoid Bioweapon Beast wasn't bad enough, it's re-writing her DNA and melting her brains on top of it. It's a wonder the Extraction Device (a peice of Wargear that allows you to safely remove a Chestburster) works as-advertised. It's also noted on a different pad that whatever it is Face Huggers squirt down someone's throat is "parasitic at the cellular level," inducing a sample of human tissue to violently react to it.
  • Alien vs. Predator:
    • Alien vs. Predator (Capcom) has bio-engineered Face Huggers that act like Puppeteer Parasites. Their hosts boat up, turn blue, and shamble about begging for death. They can also spawn multiple chestbursters and live.
    • The Alien campaign of Aliens versus Predator (1999) starts with the Xenomorph Player Character gnawing its way out of a host's chest cavity.
    • Aliens vs. Predator (2010), Leutennant Tequila is infested by a chestburster, and she notes that (in sharp contrast to everyone else in any Alien/s related media) that the Xenomorph larvae is actually quite painful, and it causes her extreme discomfort until she can be put into a Hypersleep capsule near the end of the Marines campaign.
  • The plot of Baldur's Gate III concerns the protagonists being implanted with illithid tadpoles, seeking a cure before the parasite eventually consumes their brains and transforms their bodies into mind flayers. The opening cutscene demonstrates the implantation of these tadpoles, showing them entering their victim's skulls by crawling around their eyeballs.
  • Blasphemous II: An NPC in the Choir of Thorns was "blessed" by the Grievous Miracle by filling his body with bees that produce an endless amount of honey, leaving him both crawling with bees and constantly oozing honey from his mouth and various wounds.
  • Brutal Orchestra: In addition to the fish and worms entering corpses parasitically, there is also the party member example in Longliver. Longliver is a parasitic worm with a nasty case of Horror Hunger and enters either the enemy in front of it or an ally to deal damage or heal.
  • Castlevania:
    • In Castlevania: Symphony of the Night, Beelzebub makes an appearance as a huge zombie subjected to Unwilling Suspension by way of immense meat hooks and chains. He attacks by dripping maggots and spitting flies on Alucard.
    • Castlevania: Lament of Innocence has its first and bonus bosses be examples. The first boss is a huge, disembodied brain infected with an equally-huge brainworm. The bonus boss, the Forgotten One, is a Big Red Devil chained up in the basement who also attacks by spawning gigantic maggots from holes in its flesh.
  • Destiny has the larvae of the Worm Gods, which are in each and every single member of the Hive race. The larvae give their hosts immortality and, when supplied with enough death and destruction, the ability to bend reality to their whim. However, if they are not sustained with enough death, destruction and wanton murder, they feed on their hosts. The Hive have turned this grotesque relationship into a religion.
  • Endoparasitic sees Cynte infected with a parasite that he is only able to keep at bay with vaccines syringes scattered across the research facility.
  • Home Safety Hotline:
    • The False Beet takes root in your stomach to siphon your nutrients if you eat it. Worse yet, there is no known treatment that won't end with the death of the victim, and while the handbook doesn't mention it, the customer who calls about it implies its also excruciatingly painful.
    • Unicorn Fungi are growths that appear as horn-like shapes on the head of animals, and will force said animals to perpetually dig around the place according to its needs.
  • The Last of Us revolves around a Zombie Apocalypse caused by a mutated strain of the Cordyceps fungus, which turns people into bloodthirsty zombies and, over time, covers the victims in fruiting bodies, starting with the head.
  • Resident Evil 4 and Resident Evil 5 involve a mutative Puppeteer Parasite known as Las Plagas. They often reveal themselves as carnivorous arthropods growing on people's spines after their host gets decapitated.
  • Scape and Run: Parasites is a Game Mod that turns Minecraft into this, and has updated to the point where practically every mob in the Overworld could be warped into an unrecognizable monster. Even the Ender Dragon and the player aren't safe from the Call of the Hive as it gradually spreads across the world.
  • Sid Meier's Alpha Centauri: The dominant native lifeform of Planet, Mindworms are small, maggot-like creatures that attack in massive swarms and paralyze their prey with psychic terror before laying their eggs inside the brains of their conscious, screaming victims... and they always make a beeline towards the biggest sources of pollution. Fun.
  • In Skies of Arcadia, when the crew reaches The Empire, a certain enemy is a homeless man being piloted by a gigantic cockroach-like insect.
  • In Splatterhouse 3, the player-character's wife is infested with demonic Puppeteer Parasites called "Boreworms". You only have so much time to literally beat them out of her before they eat her brains and she dies of them.
  • StarCraft's Infested Terrans are stuffed so full of alien parasites that they (both the poor Space Marine and all his new passengers) are bursting out of their spacesuits.
  • Zoochosis revolves around a night-shift zookeeper discovering strange parasites have infested the zoo animals, causing them to slowly mutate into horrifying, vicious monsters.

    Web Originals 
  • A certain Creepypasta involves a man on a bet to lose weight take anabolic steroids and a tapeworm pill together. The tapeworm becomes giant and eats all his organs.
  • Deep Root Disease from Gemini Home Entertainment involves an alien "plant" growing on human hosts, spread by insectoid creatures called "Woodcrawlers." As it grows, it converts humans into "fake people," who are aggressive and territorial. It eventually reduces them to a tangle of red fibres in the vague shape of a person who Can Only Move the Eyes. This phase is actually a carniverous plant called "Nature's Mockery."
  • Mortasheen, a horror-themed Mon world heavily influenced by real-life biology, has too many parasite-based monsters to list individually. Wormbrains are Puppeteer Parasite flatworms that control genetically engineered host bodies. Botanical monsters are cultivated as parasites of natural plants. The Genetimorph and Under fiend are dangerous parasitoid creatures whose offspring are Chest Bursters, whereas the Wrigglegeist is an endoparasite that lives harmlessly inside an unwary host. Still more parasites feed off of weirder things like genetic material and neural activity.
  • The titular being in The Worm is a psychic parasite; it can latch itself onto the psyche of anyone who knows it exists and torments them in their dreams, feeding off their fear and other negative emotions. It can be spread from person-to-person by having someone already infected tell someone else about it.

 
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Video Example(s):

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Nestor

If Rafta infects Nestor, his head will become a parasitic creature that takes over Eugene's body...or alternatively, yours.

How well does it match the trope?

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Main / PuppeteerParasite

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