History ArcVillain / WesternAnimation

** ''WesternAnimation/3Below'': General Morando.

** ''WesternAnimation/{{3Below}}'': General Morando.

* ''WesternAnimation/{{Kaeloo}}'': Season 5 focuses the main characters fighting Rules, who [[spoiler: gets a HeelFaceTurn and befriends them]] at the end of the season.

** Season 1: [[EvilOverlord Captain Grime]]
** Season 2: [[MultiversalConqueror King Andrias Leviathan]]
** Season 3: [[TranshumanAbomination The Core]], with Andrias serving as TheDragon. [[TerminatorImpersonator Cloak-Bot]] and [[AgentPeacock Mr. X]] serve as [[TheHeavy The Heavies]] for the first half of the season.

** The original ''WesternAnimation/AvatarTheLastAirbender'':
*** Commander/Admiral Zhao was part of a BigBadEnsemble with Zuko in the first season, but he was barely even mentioned following that (due to having provoked the anger of a powerful spirit, and being imprisoned in a PsychologicalTormentZone as punishment). In the next season, the most we have is that he was the first that entered the library made by Wan Shi Tong, which led to...problems when Team Avatar showed up in it.
*** Long Feng in the latter half of the second season, who ends up making the mistake of getting into a BigBadDuumvirate with [[MagnificentBastard Princess Azula.]]
*** The "Combustion Man" for the first half of Season 3. He is the biggest recurring threat against Team Avatar before the Day of Black Sun and the first villain faced right after. His final appearance [[spoiler:is tied to Zuko's HeelFaceTurn, which directly leads in to the second half of the season.]]
** ''WesternAnimation/TheLegendOfKorra'' has one per season.
*** Book 1: Amon/[[spoiler:Noatak]]
*** Book 2: Unalaq and [[spoiler:Vaatu]]
*** Book 3: Zaheer and the Red Lotus
*** Book 4: Kuvira

*** Arc 1: Vilgax, who indirectly makes several attempts to take the Omnitrix from Ben while he's still recuperating from the injuries he received from [[spoiler:Xylene's ship]], only going after Ben himself once he has fully recovered.
*** Arc 2: Kevin 11, who ends up mutating into an amalgam of Ben's first ten alien forms and, blaming Ben for this, attempts to get revenge on him. He joins forces with Vilgax in the season finale to take the Omnitrix from Ben before a failed attempt at a double-cross leaves them both trapped in the Null Void.
*** Arc 3: [[spoiler:Zs'Skayr, who is revealed to be TheManBehindTheMan to the horror-themed aliens Ben and his family come across, planning to block out the Earth's sun.]]
*** Arc 4: The Forever King, [[spoiler:Driscoll, a disgraced Plumber who joined the ranks of the Forever Knights and serves as TheManBehindTheMan to recurring villain, Enoch]].

*** Arc 1: The [=DNAliens=], humans who have been enslaved and mutated by the Highbreed.
*** Arc 2: The Highbreed, an alien race that seeks to wipe out all life in the universe [[spoiler:to ensure they don't die alone after years of inbreeding to maintain their blood purity have left them on the verge of extinction]].
*** Arc 3: Vilgax, who makes his return after stealing the powers of ten heroes so he can get his revenge on Ben.

*** Arc 1: Aggregor, [[spoiler:before Kevin sacrifices his sanity to gain the power necessary to stop him, leading him to become the FinalBoss, Ultimate Kevin]].
*** Arc 2: A BigBadEnsemble between the Forever Knights ([[spoiler:now led by the founder, Sir George]]), Diagon, and Vilgax. [[spoiler:Sir George ends being ALighterShadeOfBlack, only seeking to end the threat of Diagon to the point he would cooperate with Ben's team. After Diagon kills George, he is successfully usurped and absorbed by Vilgax, making the latter the FinalBoss.]]

*** Arc 1: Khyber (working for Malware, the real villain)
*** Arc 2: Malware
*** Arc 3: The Incurseans
*** Arc 4: Albedo
*** Arc 5: Zs'skayr and Lord Transyl
*** Arc 6: Vilgax and Eon
*** Arc 7: Proctor Servantis and the Rooters
*** Arc 8: Mad Ben
*** Arc 9: Vilgax and Maltruant

** Season 2: [[spoiler: General Lunaris]]
** Season 3: [[spoiler: Bradford Buzzard and F.O.W.L.]]

** Season 1: [[KnightOfCerebus Toffee]]
** Season 2: [[NotSoHarmlessVillain Ludo]] [[spoiler: manipulated by [[BackFromTheDead Toffee]]]].
** Season 3: [[KnightTemplar Miss Heinous]] [[spoiler: revealed to be [[FallenPrincess Princess Meteora Butterfly]].]]

** Season 4: [[MageKiller Wizards of the Black Circle/The Fairy Hunters]]

** Season 5: The Red Skull for the Six Forgotten Warriors arc; Doctor Doom during the Secret Wars three-parter; and Spider-Carnage in the Spider Wars finale.

** ''Island (2023) Part 1'': [[TheStrategist Bowie]]
** ''Island (2023) Part 2'': [[BitchInSheepsClothing Julia]]

** ''Island (2023) Parts 1 and 2'': [[BitchInSheepsClothing Julia]]

** ''Island (2023 Part 1)'': [[TheStrategist Bowie]]
** ''Island (2023 Part 2)'': [[BitchInSheepsClothing Julia]]

** ''Island (2023 Part 1)'': [[MasterStrategist Bowie]]

** ''Island (2023)'': [[BitchInSheepsClothing Julia]]

** ''Island (2023)'': [[BadInfluencer Julia]]

** ''Revenge of the Island'': [[FarmBoy Scott]]

** Season 1, ''Island (2007)'': [[AlphaBitch Heather]]
** Season 2, ''Action'': [[GoGetterGirl Courtney]]
** Season 3, ''World Tour'': [[TheChessmaster Alejandro]]
** Season 4, ''Revenge of the Island'': [[FarmBoy Scott]]
** Season 5, ''All-Stars'': [[SplitPersonality Mal]]
** Season 7, ''Island (2023)'': [[BadInfluencer Julia]]

** Season 1: Trix
** Season 2: Lord Darkar/The Shadow Phoenix
** Season 3: Valtor
** Season 4: Wizards of the Black Circle
** Season 5: Tritannus
** Season 6: Selena
** Season 7: Kalshara and Brafilius
** Season 8: Valtor again

** Season 3/ The Sins of The Father Arc: The Green Goblin

* ''WesternAnimation/SpiderManTheAnimatedSeries'': While the Kingpin is the overall Big Bad, each season (save the fourth) has an additional prominent threat:

** Season 3/ The Sins of The Father arc: The Green Goblin

** Season 3: The ''[[PsychoPrototype Scorpius Rex]][[spoiler:, Both of them. Doctor Henry Wu takes this role after the ''Scorpius Rexs'' get defeated]]