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* The first episode of ''WesternAnimation/{{Archer}}'' was tentatively entitled "Mole Hunt", where Archer starts a rumor about there being a mole in ISIS, causing everyone to, well, [[ExactlyWhatItSaysOnTheTin hunt for the mole]]. And it turned out [[spoiler: [[AccidentalTruth there really was a mole]].]]
* ''WesternAnimation/DannyPhantom'': Danny suspects new love interest Gregor is The Mole for the [[GovernmentAgencyOfFiction Guys in White]] because of his white clothes and his coincidental arrival at the same time as those guys. [[spoiler: He's not.]] Unfortunately, the reveal was too easy to point out. [[spoiler: Though I didn't suspect he was a {{Fauxreigner}}]]!
* Franchise/{{DCAU}}:
** In ''WesternAnimation/JusticeLeague'', it turns out that [[spoiler: Hawkgirl]] has been The Mole the entire time. [[spoiler: Albeit one who did a HeelFaceTurn and left feeling she required self-imposed penance, but still one that they had a hard time trusting for the rest of the run of the series.]]
** An odd variation of the theme occured in the ''WesternAnimation/BatmanBeyond'' multi-part episode "The Call". After a member of the Justice League was injured in a suspicious accident, Superman recruited Terry in an effort to find out if there was, indeed, a traitor among their members. [[spoiler: As it turned out, Superman himself was the traitor, but not intentionally; he was under the MindControl of one of the aliens he had kept at the Fortress of Solitude for so many years.]]
* ''WesternAnimation/FantasticVoyage''
** "The Menace from Space". Dr. Kasdan, an expert on interstellar biology, is added to the team when it investigates a manned space flight which has been infiltrated by a dangerous space life form. He turns out to be a traitor working for a hostile government and tries to sabotage the mission so that the ship will crash in the U.S. and release the life form there.
** "The Mind of the Master". When Guru suffers brain damage as the result of an attack by an unidentified opponent, the team must miniaturize and enter his brain to repair it. They take along a man who is Guru's oldest associate, and who is revealed to have been the man who attacked him.
* ''WesternAnimation/GIJoeRenegades'' has a couple of benevolent examples. Lady Jaye subverts Flint's efforts to catch the Joes, and Breaker had an inside man in Cobra for awhile.
* ''WesternAnimation/HuntikSecretsAndSeekers'' has one and it's [[spoiler:Zhalia Moon]].
* ''WesternAnimation/JonnyQuest'' TOS.
** "The Quetong Missile Mystery". Lieutenant Singh of the Quetong Police has sold out to General Fong.
** "Skull and Double Crossbones". Jose the cook is secretly a member of the pirate crew stalking the Quest team.
** "Treasure of the Temple". The Indian guide Montoya is in league with a ruthless treasure hunter.
** "The Curse of Anubis". Dr. Ahmed Kareem is actually the {{Villain}}.
* ''So the Drama'', the (first) GrandFinale to ''WesternAnimation/KimPossible'', has a rather obvious mole, who nonetheless fools everyone.
* ''WesternAnimation/TheLegendOfKorra'': In a WhamEpisode, we find out about [[spoiler:Hiroshi Sato]].
* ''WesternAnimation/NascarRacers'': Lyle was this at the beginning as he was officially a Fastex driver but was spying on them for Garner Rexton.
* ''WesternAnimation/ScoobyDooMysteryIncorporated'' is full of moles and [[ChronicBackstabbingDisorder traitors]], as you'd expect from a show that exemplifies the GambitPileup. [[spoiler: Marcie (a.k.a. Hot Dog Water)]] reforms, joins Mystery Inc., ''betrays'' Mystery Inc. to Mister E, betrays Mister E ''for'' Mystery Inc., and finally [[spoiler: [[HeroicSacrifice dies to slow down Pericles' robots]] so the gang can escape]]. [[spoiler: Freddy's real parents]] are obvious spies from the start, but who they're working for changes halfway through the plan, [[spoiler: and they die while attempting to change allegiances ''again'']].
* Parodied on ''WesternAnimation/TheSimpsons''.
-->'''Fat Tony:''' Now some unpleasant news. I have learned that someone in this room is a squealer.
-->'''Legs:''' We've narrowed it down to either Johnny Tightlips or Frankie the Squealer.
-->'''Frankie:''' Okay, it's me! I can't help it! I just like squealing! It makes me feel big!
* ''WesternAnimation/StarTrekTheAnimatedSeries'' episode "The Jihad". Near the end, party member Charr reveals himself as the person behind the theft of the Soul of the Skorr.
* ''WesternAnimation/StarWarsTheCloneWars'':
** [[Recap/StarWarsTheCloneWarsS1E6DownfallOfADroid "Downfall of a Droid"]]/[[Recap/StarWarsTheCloneWarsS1E7DuelOfTheDroids "Duel of the Droids"]]: R3-S6, a pseudo-SuspiciouslySimilarSubstitute for R2-D2 who briefly replaced the famous droid after he was captured, and tried to mask his attempts to kill Anakin and co. as accidents.
** [[Recap/StarWarsTheCloneWarsS1E9CloakOfDarkness "Cloak of Darkness"]]: [[spoiler:Captain Argyus, head of the Senate Commandos]]; the wow-factor in this case came from the fact that, as an [[spoiler:elite bodyguard in the employ of the Galactic Senate]], most would expect him to be as loyal as they come.
** [[spoiler:Clone trooper Sergeant Slick]] sold out the planet Christophsis in [[Recap/StarWarsTheCloneWarsS1E16TheHiddenEnemy "The Hidden Enemy"]]. What made it more surprising than [[spoiler:Captain Argyus]] is that he was [[spoiler:a clone. Men who you would not think would do that. Or be capable of such a thing due to their training/programming.]]
* ''WesternAnimation/StarWarsRebels'': The first season has [[spoiler:Senator-in-Exile Gall Trayvis, who, working for [[StateSec the ISB]], posed as a VoiceOfTheResistance to monitor rebel cells and lure troublesome ones such as the ''Ghost'' crew into "accidents". The crew winds up blowing his cover by escaping the trap set for them.]]
* Several in 1973-74 season ''WesternAnimation/{{Superfriends}}'' episodes.
** In "The Fantastic Frerps", Poly Lean is secretly an agent for the villain King Plasto.
** In "The Power Pirate", a space alien takes the form of Sir Cedric Cedric to fool the Super Friends.
* Terra in ''WesternAnimation/TeenTitans'', which is an adaptation of a famous story arc from [[Comicbook/TeenTitans the comic's]] 1980s heyday, "The Judas Contract". Unlike the comics, it's done with a sympathetic angle towards Terra.
** Also in ''WesternAnimation/TeenTitans'', Bumblebee is a mole for the Titans in Blood's school, although Cyborg doesn't know it and tries to fight her for real.
*** When Brother Blood finds out about this, he is not amused, as this was the second mole found in his school in such a short period of time (the other being Cyborg).
---->'''Brother Blood:''' (''getting more agitated as he continues speaking'') Another spy? Tell me, was anyone at my school actually there to LEARN?\\
'''Bumblebee:''' (''gets into a fighting pose'') I learned plenty.
* As shown on the characters page, Owen from ''WesternAnimation/TotalDrama Action'' was one for Chris, although he was rather reluctant, and had a legitimate reason for doing so.
* Shockwave from ''WesternAnimation/TransformersAnimated''. The Autobots know him as Longarm Prime, head of Autobot Intelligence.
** Sideways in ''Anime/TransformersArmada''. After switching between the Autobots and Decepticons several times, he is revealed to be an agent of Unicron, making both sides fight each other to fuel him with their hatred.
** And Sideways in ''Anime/TransformersCybertron'', not to be confused with the Sideways mentioned above, is a mole in the Decepticons working to...actually, it's never quite clear why he's there.
*** He wants the Cyber Planet Keys for himself, so as to annihilate Gigantion and avenge his homeworld Planet X, which was destroyed by one of its own weapons in a war with Gigantion. He eventually settled for being with the Decepticons, because he felt their aggression would serve him better. He sided with Starscream eventually, betting on the madbot {{Determinator}} who had the bearings to attack all the Autobots at once to get what he was after. Eventually Sideways bailed on the 'Cons entirely after almost getting vaporized by Optimus Prime, and thereafter worked solely with his fellow survivor Soundwave.
** [[spoiler: Tarantulas]] from ''WesternAnimation/BeastWars''. Turns out that he was working for [[spoiler: the [[OmniscientCouncilOfVagueness Tripredacus Council]]]] the whole time. [[spoiler: And possibly Unicron. [[HiddenAgendaVillain We're still not quite sure.]]]]
* A major plot point in ''WesternAnimation/YoungJustice'' is that apparently a member of the team is a traitor. Artemis seems to the most obvious candidate, though her debut episode and an issue of the tie-in comic make it seem like this is a red herring.
** A recent episode had the team leader, two supervisors, a member, and an outside friend sit down and discuss the possibilities. According to them, Artemis has suspect connections, Conner has suspect origins, and M'gann has a suspect story, while Wally, Robin, and Kaldur are "above suspicion". Make of that what you will.
*** In the end [[spoiler:The mole was nobody on the team. Wally, Robin and Kaldur were above suspicion after all, while Artemis, Superboy and M'gann were all blackmailed, but opted to come clean about their secrets rather than betray the team. Red Arrow was the mole (and he was an unknowing brainwashed one), and he was to be the mole for the Justice League (having worked his way into their ranks by the end of the season) and not the Young Justice team. Implying they had a mole in their team was just to sow dissent.]]
** In season 2, [[spoiler: Kaldur has pretended to undergo a FaceHeelTurn to spy on the villains. He is later joined by Artemis, who has faked her death and assumed a new identity.]]
* In season 2 of ''WesternAnimation/WinxClub'', [[spoiler:the new teacher Avalon]] is actually Darkar's spy in Alfea. The real [[spoiler:Avalon]] is locked up in Darkar's dungeon.
* ''WesternAnimation/{{Ben 10 Omniverse}}'': It is revealed in "Mud Is Thicker Than Water" that a Tetramand named Gorvan has infiltrated the Plumbers and has been stealing their weapons for Psyphon and his minions. Of course, the Plumbers were smart enough to have Lucy infiltrate Psyphon's gang as a {{Reverse Mole}}.
** Gorvan also did this in the video game ''VideoGames/{{Ben 10 Alien Force}}'' where he is a rogue Plumber who has been stealing alien tech to help the Highbreed build their Weather Tower in preparation for the war. He even tricked Ben Gwen and Kevin into stealing some of the items for him.
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