History SealedEvilInACan / WesternAnimation

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* ''WesternAnimation/TheFairlyOddparents'': Norm the Genie. He's released multiple times by Crocker, Chester and Timmy, and each time has a different scam towards his revenge on Timmy.
%%* ''WesternAnimation/{{Felidae}}'': Claudandus means "something that must be sealed".

* ''WesternAnimation/TeenTitans'':

* PlayedForLaughs in ''WesternAnimation/SouthParkPostCovid'', where in the BadFuture the group is trying to enlist the aid of a dangerous mental patient trapped in the local BedlamHouse who's revealed to be [[spoiler: Butters]]. Going by the name of Victor [[spoiler: [[RunningGag Chaos]]]], he became a charismatic, fast-talking [[HonestJohnsDealership used car salesman-type]]. Except instead of dealing in vehicles, he's made millions scamming people into investing everything they have into cryptocurrency- specifically [[https://en.wikipedia.org/wiki/Non-fungible_token NFTs]]. [[spoiler: When Stan and Kyle visit him, the head doctor is horrified to discover they left him a piece of paper, which he turns into a makeshift TinCanTelephone to manipulate the guard into [[ThePatientHasLeftTheBuilding letting him go]] [[TheCorrupter with his life savings]].]]

* ''WesternAnimation/{{Centaurworld}}'': [[spoiler:The Nowhere King]] was sealed in TheVoidBetweenTheWorlds in order to prevent him from destroying the two worlds, and in the Season 1 finale [[spoiler:is accidentally freed]].

* In ''WesternAnimation/AdventureTime'', Marceline's father, Hunson Abadeer, is sealed in the Nightosphere. Finn [[NiceJobBreakingItHero frees him, not knowing how evil he was]]. In the end, Finn manages to seal him back into the Nightosphere. Even worse is [[OmnicidalManiac the Lich]], the UltimateEvil who was imprisoned inside amber within a great tree by the legendary hero Billy. He finally broke free during the season 2 finale.

* In ''WesternAnimation/{{Animaniacs}}'', the Warner Brothers (and their sister Dot) were Sealed Zany in a Water Tower. In this case, it was more Sealed ''Chaos'' in a Can. The Warners keep breaking loose throughout the series and annoying people.

* The position of [[EvilOverlord Phobos]] and several of his most powerful minions for most of the second season of ''WesternAnimation/{{WITCH}}'' [[spoiler: until he gets released by the heroines]]. [[BigBad Nerissa]] was also once a Sealed Evil In A Can, but she escaped several decades before the series begins.
** She ends up being [[spoiler: Sealed Evil in a ''Jewel'']] at the end of Season 2.

* ''WesternAnimation/{{Trollhunters}}'': A major part of the series' MythArc is that [[BigBad Gunmar]] and his Gumm-Gumm army have been trapped in the dimension known as the Darklands for centuries, with his remaining minions on Earth trying to open a portal to free him. [[spoiler: He successfully escapes midway through Season 2.]] Another example is revealed in Season 3, [[spoiler: when we learn that [[GreaterScopeVillain Gunmar's master Morgana]] has been imprisoned inside the Hearthstone that Trollmarket is built around for just as long.]]

** Lapis Lazuli traps Jasper in a fusion in a Sealed Inside a Person-Shaped Can in the bottom of the ocean until the crystal gems freed her because she toke over the fusion and become much more powerful resulting in a Never Punish Your Enemy in a Way That Will Grant Him More Power.

** The [[TerribleTrio three Minions of Set]], a team of demonic warriors created by [[Myth/EgyptianMythology the Egyptian god]] [[GodOfEvil Set]]. These three monsters were NighInvulnerable and thus invincible against any mortal warrior, so the Pharaoh summoned [[PowerOfTheSun the sun god Ra]] to imprison the Minions in a tomb. Thousands of years later, Aku frees them, and then sends them to kill Jack. Though [[CurbStompBattle they do a number on Jack]], so much so that he is forced to flee whenever they find him, in the end Jack summons Ra for a second time; and Ra, apparently savvy that this trope never works, decides to just destroy the Minions with ease.

** In the backstory, the BigBad [[EldritchAbomination Aku]] was sealed away within a tall black tree by Jack's father (the Emperor of Japan) after Aku's initial rampage through his kingdom. In the first episode, Aku is released once again when the tree gets zapped by energy from a solar eclipse, allowing him to destroy human civilization and TakeOverTheWorld.
** The [[TerribleTrio three Minions of Set]], a team of demonic warriors created by [[Myth/EgyptianMythology the Egyptian god]] [[GodOfEvil Set]]. These three monsters were NighInvulnerable and thus invincible against any mortal warrior, so the Pharaoh summoned [[PowerOfTheSun the sun god Ra]] to imprison the Minions in a tomb. Thousands of years later, Aku frees them, and then sends them to kill Jack. Though they do a number on Jack- so much so that he is forced to flee whenever they find him- in the end Jack summons Ra a second time, and Ra, apparently savvy that this trope never works, decides to just destroy the Minions with ease.

* ''Fanfic/TheDragonPrince'' has Aaravos, an elf mage who was imprisoned long ago in a GildedCage by the Dragon King, his only contact with the outside world being a MagicMirror. After [[BigBad Viren]] figures out how to work the mirror and makes contact with him, he becomes a WillingChanneler for Aaravos' magic, turning it into a LeakingCanOfEvil situation.

** Discord had been [[TakenForGranite imprisoned in a stone statue]] by Celestia and Luna since ancient times for the suffering his rule brought everyone in Equestria. However, his prison weakened over time, and the Cutie Mark Crusaders release him by [[NiceJobBreakingItHero creating discord (fighting) in front of him]], giving him the power to break free. The Mane Six put him back in his can at the end of the two-parter. Eventually, though, they release Discord and [[HeelFaceTurn reform him]] when Celestia decides she has use for his powers.

* ''WesternAnimation/JusticeLeague'': Hades, Greek God of the Underworld. Released by Felix Faust in the hopes that Hades will grant him "ultimate knowledge" in return. Hades naturally betrays Faust by [[spoiler:causing him to instantly age to an old man since "Ultimately, pain and suffering are all humans will ever know."]]

* ''WesternAnimation/RandyCunninghamNinthGradeNinja'': The Sorcerer, who is sealed below Randy's school and seeks to free himself by causing chaos with the people he mutates.

** In an episode of ''WesternAnimation/SonicSatAM'', Robotnik steals a computer of magic spells from the [[HeelFaceTurn formerly evil]] wizard Lazar, and Sonic attempts to get it back. When asked why he can't just destroy the computer, Lazar says that would release all the evil it contains.

** The Preeminent is an EldritchHorror that serves as the ruler and embodiment of the Cursed Realm. Trapped in an alternate dimension, she sends her ghost warriors, namely Morro, to find the Realm Crystal to free her in her quest to curse all Sixteen Realms (including Ninjago).

* ''WesternAnimation/BeastWars'' brought us [[PsychoPrototype Protoform X a.k.a. Rampage]]. He was the result of Maximal experiments to produce an immortal super-soldier by copying Starscream's mutant spark. They succeeded in producing [[GoneHorriblyRight an unkillable serial killer that slaughtered human and Cybertronian alike]]. After eventually capturing him, the Maximal Elders sealed in up in a stasis pod, then turned him over to Optimus Primal's to dump on some desolate asteroid since they couldn't figure out how to destroy him. Several adventures later and the monster was unleashed again and recruited by the Predacons.