The animators did a pretty good job drawing the [[EldritchAbomination scariest creatures imaginable]].

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* ''WesternAnimation/AdventureTime'':
** Hunson Abadeer, an unkillable, hideous monstrosity who rules [[EldritchLocation the Nightosphere]] in a perpetual state of chaos and pain, has a OneWingedAngel form Lovecraft would have been proud of, and whose first order of business when he managed to escape was to [[YourSoulIsMine suck up the souls]] of everyone in Ooo. According to [[ComicBook/AdventureTime the comics]] he became ruler of the Nightosphere by deposing some even nastier abominations.
** Prismo is a being of unlimited power who lives outside of time and space at the centre of TheMultiverse, casually creates (and ''destroys'') entire {{Alternate Universe}}s, and doesn't even have a physical form so much as he's a projection of the Time Room, but fortunately [[DidWeJustHaveTeaWithCthulhu he's a pretty friendly guy]]. In the WhamEpisode "Wake Up" [[spoiler:Prismo's true form is revealed to be a sleeping old man who manifests whatever he dreams about in the real world.]]
** Bella Noche is "a being of pure AntiMagic" from another dimension. It first appears as a slimy green head, and upon entering our dimension it is a giant black cube that constantly expands and neutralizes the magic in anything it comes into contact with. Attempts to stop the expanding cube only caused it to expand and mutate further. [[spoiler:Doesn't stop Betty from defeating it by [[DidYouJustPunchOutCthulhu punching it in the face]].]]
* ''WesternAnimation/DextersLaboratory'':
** The monster in "Dee-Dimensional".
** The interdimensional beast "Jojo" in "Mandarker". He apparently helped Mandark write the book ''The Magic of Science by Mandark and Jojo'', but when Mandark summons him as part of a science fair project, he goes berserk and tries to eat Dee Dee.
* The spirits Raava and Vaatu from ''WesternAnimation/TheLegendOfKorra'' are the manifestations of peace and chaos respectively. Every 10,000 years the two battle for control of the universe, and although neither one can be killed by the other (they'd just re-emerge in time for the next round), if Vaatu wins he'll cause TheEndOfTheWorldAsWeKnowIt. Before he became the first Avatar,[[NiceJobBreakingItHero Wan accidentally released Vaatu and started a massive war between humans and spirits]], but Vaatu shot himself in the metaphorical foot [[NiceJobFixingItVillain by letting Wan live, allowing him to become the first Avatar and imprison Vaatu in the Spirit World]].
* ''WesternAnimation/Ben10UltimateAlien'':
** Lucubra, the main antagonist of the episode "The Creature From Beyond" [[spoiler:and one of the breed of monstrous minions to the BigBad of the season, Diagon]]. This extra-dimensional horror boasts SuperStrength, NighInvulnerability, FrickinLaserBeams, and the power to devour a person's thoughts with MindControl as a bonus.
** Diagon. It's held behind the same seal as Lucubra, but is ''much'' worse (Gwen says compared to Diagon, Lucubra is an ''insect!''). In the next episode, they're actually shown the Diagon, and while the audience doesn't see it ([[TrailersAlwaysSpoil though commercials very clearly show him]]), Gwen and Kevin react to seeing him as if they were ''in pain''. [[http://ben10.wikia.com/wiki/Diagon Just take a look.]] He comes from another dimension, is referred to as an "Old One" by Charmcaster, and has enough power to match and defeat a powered up Way Big (one of Ben's most powerful aliens, if not THE most powerful).
* Franchise/{{DCAU}}:
** ''WesternAnimation/SupermanTheAnimatedSeries'' had as a one-time threat a HiveMind alien blob thing that called itself "Unity". Using a creepy preacher as its primary avatar, it turned [[spoiler:Smallville]] into a TownWithADarkSecret and nearly absorbed all the townsfolk into itself.
*** In the comics, Ian Karkull is a guy with shadow powers, but in this, it's like the writers didn't know if they wanted Cthulhu or Satan and so ''combined them''. A common hood gets his hand on a tablet and reads it aloud. ''Bad'' idea. He becomes the host to a shadowy tentacled ''something'' that wants to create HellOnEarth and basically overwrites the Daily Planet with his own unreality, everyone caught within, Lois and Jimmy included, becoming possessed and transformed by the demonic creatures that live there. There's a seemingly bottomless pit in the center. In the end, Superman has to chase the dropped tablet (ComicBook/DoctorFate needs the original tablet to undo it all) down this pit, and it turns that if you go far enough, farther than the eye can see from the surface, the pit ''does'' have a bottom. The bottom ''has a mouth.'' The bottom is also '''rising.'''
** In a two part ''WesternAnimation/JusticeLeague'' episode "The Terror Beyond", Comicbook/{{Superman}} and Co. go fight [[LawyerFriendlyCameo Ichthultu]]. A giant alien monstrosity not bound by time or space going up against a group of superheroes in a work that sits firmly on the Idealistic side of the SlidingScaleOfIdealismVersusCynicism? The [[DidYouJustPunchOutCthulhu beatdown]] was the source of much awesomeness.
* In its planning stages, ''Disney/TheEmperorsNewGroove'' originally had VainSorceress Yzma summon a force of darkness, called Supai, to [[TheNightThatNeverEnds blot out the sun and plunge the entire world into eternal night]].
* One of these in ''WesternAnimation/{{Futurama}}'' [[spoiler:[[DidYouJustRomanceCthulhu attempts to date and have sex]] with the entire universe]] in the second movie.
* ''WesternAnimation/GravityFalls'':
** An [[EasterEgg easter egg]] in the episode "Irrational Treasure" lists on the top-secret Northwest Cover-Up document that there is an enormous, evil, time-devouring baby from another dimension [[SealedEvilInACan that is frozen in an Antarctic glacier]]. "The Time Traveler's Pig" reveals that the "Time Baby," as its mortal supplicants dub it, is eventually released and conquers the world... or at least establishes the TimePolice.
** Bill Cypher, a [[SinisterGeometry pyramid-shaped]], [[RealityWarper reality warping]] demon who invades people's dreams. "I'LL BE WATCHING YOU..."
* ''WesternAnimation/TheGrimAdventuresOfBillyAndMandy'': The Nergals, especially Junior. In addition to [[VoluntaryShapeshifting shapeshifting]], he can walk through walls, freeze people in stasis, and spawn bat-like imps from his own body. His true form is so hideous that they didn't even show it onscreen until it (ostensibly) appeared in "The Greatest Love Story Ever Told Ever". Note that Junior isn't ''always'' evil. (If you don't make him angry, he can be somewhat decent.)
* Short-lived (only 13 episodes long) 80's {{Hasbro}} series ''{{WesternAnimation/Inhumanoids}}'' revolved around the heroic "Earth Corps" fighting against ancient, {{kaiju}}-like horrors from the center of the Earth. The three main antagonists were Metlar (giant mineral-based demon who throws globs of molten rock/iron at his foes), D'Compose (rotting zombie dinosaur who could revive the dead and turn the living into decaying zombie slaves with a touch) and Tendril (Cthulhu-like [[WhenTreesAttack plant-monster]]). Others appeared in several episodes, like Gagoyle and Ssslither, whilst recurring foe Nightcrawler was a HumanoidAbomination created by D'Compose from the corpse of a human enemy.
* An episode of ''WesternAnimation/MovilleMysteries'' revealed the school janitor was a former AdventurerArchaeologist who had one these (all we see of it are red tentacles) [[SealedInsideAPersonShapedCan sealed]] in [[EvilHand his big toe]].
* ''WesternAnimation/MyLittlePonyFriendshipIsMagic'' has plenty of giant scary monsters in it, but few are more eldritch-like than the [[EmotionEater Windigos]]; horrifying, [[EvilIsDeathlyCold icy]], ghostlike [[HellishHorse horses]] that create blizzards wherever they go and feed on hatred and anger. They like to freeze everyone who has negative feelings and entomb them in ice, presumably to [[AndIMustScream feed on their anger and hatred forever]]. [[spoiler:Thank [[OhMyGods Celestia]] that the founders of Equestria were able to oust them with ThePowerOfFriendship]]. It's subtly implied that they manipulate ponies' emotions to make them more hateful, and that they're ''still around'' and will always exist [[AsLongAsThereIsEvil as long as ponies continue to have conflicts]].
* The demon that [[BigBad Mok]] wants to summon in ''WesternAnimation/RockAndRule'' lacks a fully defined, stable form, has immense power, and its actions are more akin to an all-consuming supernatural force of destruction than those of a recognizably sentient being.
* In ''WesternAnimation/SabrinaTheAnimatedSeries'' when Sabrina, Harvey and Salem are trapped inside Harvey's comic book world, they encounter an entity known as the Dreaded Dysphilia. It appears as a flying blob of fungus that erases everything in its path forever, and Harvey's negative self-esteem makes it bigger. That's right - a monster that is powered by the negative self-esteem of a ''teenager''. What's more is that it's completely alien to the comic book world - Harvey didn't even create it.
* In the backstory of ''WesternAnimation/SamuraiJack'', the gods, Odin, Vishnu and Ra, hunted and defeated Evil itself, a black mass of pure ''nothing''. A single fragment survived and fell to Earth and eventually becoming [[BigBad Aku]].
* While most of the monsters in the ''Franchise/ScoobyDoo'' franchise are [[ScoobyDooHoax fake]], the occasional real one shows up. The BiggerBad of ''WesternAnimation/ScoobyDooMysteryIncorporated'' is an evil annunaki, which are extra dimensional beings that usually communicate by possessing animals. The unnamed entity spends most of the series [[SealedEvilInACan sealed in a coffin]], but still manipulates the creation of mystery solving groups and either attracts or creates the various crooks in costumes, as well as [[TheCorruption stealing and imprisoning the best parts]] of people that live in Crystal Cove. When released, it [[HellOnEarth unleashes hell and animal headed minions on the town]] and [[ToServeMan starts eating the residents,]] swearing to [[OmnicidalManiac eat entire galaxies and eventually the universe]]. Yes, the offspring of Satan and Cthulhu made an appearance on a Scooby-Doo show.
* The prime antagonist of ''WesternAnimation/ShadowRaiders'' is the Beast Planet, a PlanetEater the size of a gas giant that [[ImplacableMan never stops, tires, or negotiates]], [[WeHaveReserves produces an unlimited supply]] of scary-looking {{Mooks}}, and '''is completely NighInvulnerable'''. They only defeat it by [[spoiler:teleporting it away, and it then just starts eating other planets and may well have absorbed the teleporter technology...]]
* ''WesternAnimation/SouthPark'':
** The Wall-Mart store chain, which exists [[AsLongAsThereIsEvil As Long As There Is Capitalism]].
** In "Coon 2: Hindsight" and "Mysterion Rises", DP (formerly BP) drill into another dimension and release Cthulhu.
** Cartman becomes one in "Trapper Keeper" when he is assimilated.
* {{Retcon}}s to the ''Franchise/{{Transformers}}'' backstory turned the [[PlanetEater planet-eating]] Unicron into an Eldritch Abomination, not only giving him the power to move between dimensions and universes, but also insinuating that a piece of his dark soul inhabits all of the Transformers since the beginning, meaning that any one of them could turn into a servant to his apocalyptic hunger. His [[https://www.youtube.com/watch?v=4lo7JPLJUUU first appearance]] in ''WesternAnimation/TransformersTheMovie'' shows how abominable he is when he devours a throwaway planet in all its gruesome detail in a way that reeks of a CosmicHorrorStory. Shots of his bizarre pseudo-biological inner workings make his strangeness even more pronounced.
** He does ''not'' [[PlanetEater eat planets]] for sustenance - he gets ''that'' from [[AsLongAsThereIsEvil hatred and strife]], and will exist so long as these things do. No, he eats planets because he's offended by existence. All of it. So he's trying to eat it. All of it. Every dimension. He's already devoured approximately 20% of all known existence in the {{multiverse}} and is eager to continue his binge. When he's done, ''space itself as we know it'' will be ''eaten''. He apparently [[ApocalypseHow once destroyed reality itself]], and the only reason that anything exists at all is because he missed a couple of fragments and fell asleep, allowing them to rebuild.
** In ''WesternAnimation/TransformersPrime'', Dark Energon is revealed to be Unicron's blood. This is a substance that makes anyone that uses it hear Unicron's thoughts, gives them a serious power boost, causes feelings of intense nausea and illness upon first contact (though eventually it is possible to build up a resistance), almost kills a human ([[spoiler:Raf, to be exact]]), and resurrects dead Transformers as mindless berserkers, allowing living ones with enough Dark Energon to control them [[spoiler:unless Dark Energon is mixed with something such as synthetic energon]]. If his blood can do that...
** Dark Energon isn't the only version of Unicron's blood that did horrifying things; Angolmois (From ''Anime/BeastWarsII''. Dark Energon is basically Angolmois by another name, though the makers of ''VideoGame/TransformersWarForCybertron'' say it's pure coincidence.) is liquid chaos, causing completely random and often puzzling effects. In the comics, it made someone into a Herald without them even realizing it, mutating them into monsters that frothed green and granting extreme amounts of power.
** The Swarm in ''Transformers: Generation 2'' was born from a long-lost ritual of Transformer reproduction that their god Primus never intended them to retain, and is obsessed with destroying all mechanical life in the known universe.
** The big reveal of ''Anime/TransformersArmada'' is that [[spoiler:the Mini-cons are created from Unicron's cells]]. Keep in mind how powerful ''they'' are, especially when brought together. EarthShatteringKaboom power in the right combination, and this [[spoiler:magic, pretty 'song' they do]]. It's all part of ''him''.
* ''WesternAnimation/TheTrapDoor'' is full of these things (including the main character's employer). Some of them really quite nightmarish. [[WhatDoYouMeanItsForKids It's an 80's British claymation kids' show.]]
* An episode of ''WesternAnimation/TheWildThornberrys'' set in Africa had Eliza and Darwin venture into a forbidden patch of the jungle where a demon, monster, or something even worse supposedly dwelled. The seemingly supernatural events that occur throughout the episode ''could'' be regarded as Eliza simply hallucinating from panic and fear... [[RealAfterAll until the very end]].

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