->'''Garak:''' I'm glad to see the plan is going as scheduled.\\
'''Jem'Hadar Soldier:''' What plan is that?\\
'''Garak:''' You mean no-one told you? You see, I pretend to be their friend... and then I shoot you. ''[shoots him]''
-->-- ''Series/StarTrekDeepSpaceNine''

Every so often, a hero (usually a police officer or spy) will pretend to go to TheDarkSide in order to reach the BigBad. This is not the same as TheInfiltration; in this case, the hero keeps his true identity, but convinces the bad guys that his loyalties have switched. Frequently many of the good guys end up believing it too.

The hero will often have to persuade the bad guys of his authenticity by [[ShootYourMate attacking one of his 'old' comrades]] or [[IfYoureSoEvilEatThisKitten doing something else evil]]. Another frequent tactic is for the hero ''not'' to contact the bad guys, but instead just arrange for his life to fall apart -- get fired from his job, start to drink, and so on -- and wait for his enemies to contact him.

The audience is usually told in advance that the hero is doing this, but occasionally [[{{Superdickery}} they are not.]] Often it is subject to a sort of UnspokenPlanGuarantee: if the audience knows, the bad guys are more likely to know as well.

Compare the inverse, the HeelFaceMole.

'''As a betrayal trope many examples will contain spoilers.'''


[[folder:Anime & Manga]]
* [[spoiler:Chiyuri]] from ''LightNovel/AccelWorld'' ended up in this for [[spoiler:joining Dusk Taker]], but it turns out [[spoiler:she didn't. She only sticks on his side to become strong enough and see that her ability known as 'Citron Call' can reverse time to give back Haru's wings that Nomi has stolen from him.]]
* In ''Manga/{{Beelzebub}}'' [[spoiler:Himekawa pretends to desert his TrueCompanions in favor of a stronger guy. Turns out the machine everyone thought was helping his new crew out was actually storing up Baby Beel's energy until it was enough to handle Takamiya and Lucifer. Himekawa proceeds to destroy the million-dollar machine to release the energy the second he has confirmation that it is enough and dismisses the loss as "pocket change" before revealing he held Beel's third crest all along, all but stating that his loyalty has always been to Oga.]]
* ''Manga/{{Bleach}}'':
** [[spoiler: Byakuya]] does a pretty good one in the Zanpakuto arc. The ally he has to kill is [[spoiler: his sister Rukia's Zanpakuto, Sodeno Shirayuki]], and he does it without flinching [[TheStoic (of course)]].
** [[spoiler:Uryu Ishida]] pretends to join the Vandenreich in an attempt to assassinate their leader, Yhwach. However, Yhwach sees through the ploy immediately and [[KickedUpstairs appoints him his successor]], meaning everybody's eyes will be on him and an assassination attempt will be all but impossible. [[spoiler:While Uryu's assassination attempt was on a far bigger scale than merely a sneak attack on Yhwach (namely, spreading the innocuous-looking components of a ''FantasticNuke'' all over Yhwach's palace to wipe out the entire Vandenreich, to be triggered while Yhwach is sleeping), [[TheDragon right-hand-man Haschwalth]] figures out his plan anyway.]]
* [[spoiler: Hinata]] from ''Manga/BloodyCross''. At first it looks like he's a traitor who tried to kill Tsukimiya and sided with Arcana, but it turns out he's a fake defector who's still working for Tsuduki.
* [[spoiler: Rowan Dietrich]] from Anime/BlueCometSPTLayzner becomes this during the last arc.
* [[spoiler: Lelouch]], along with [[spoiler: Suzaku]] from ''Anime/CodeGeass'' pull this off at the end of the series. They ''pretend'' to become the new [[BigBad villains]] who take over the world, but it turns out [[spoiler: Lelouch had planned his own death to bring world peace]].
* ''Anime/DigimonSavers'': [[spoiler:Kurata rolls out the red carpet Touma to do this. Touma goes so far as to get into a fistfight with Masaru and nearly kills Ikuto and Yatagaramon.]]
* Franchise/DragonBall:
** In ''Anime/DragonBallGT'', Gill appears to betray the team to the machine mutants. Only Trunks is in on the plan.
** In the Garlic Jr. Saga of ''Anime/DragonBallZ'', Piccolo did a variation of faking defection to Garlic Jr: He ended up being bitten by one of the Black Water Mist-infected characters, and then faked infection himself and fought Gohan and Krillin ruthlessly in order to get close enough to Garlic Jr. and then free Kami and Mr. Popo. He only let Krillin in on the plan when he was "biting" him on the neck, resulting in Krillin faking defection as well.
* [[spoiler:Gajeel]] was revealed to be one of these for the ''Manga/FairyTail'' guild.
** Also Gray in a filler arc. [[spoiler:Gray does this a second time, along with Levy, in the manga's Avatar mini-arc.]]
* [[spoiler: Saruhiko Fushimi]] does this ''brilliantly'' in ''[[Anime/{{K}} K: Return of Kings]]''. Since he is one of the few Clansman known to have left one Clan to join another, he and his King use that reputation, stage a fight in front of the whole Clan, and have him storm off and [[spoiler: reactivate his JUNGLE account]], making it look like a regular case of ChronicBackstabbingDisorder. When his true plan and choices are revealed, it turns ''everything'' that has been shown of that character so far on its head. His King even goes to the Clansman of his old Clan who still holds a grudge over his original "betrayal", and tells him that there is one way for the Fake Defector to survive - that is, to actually betray his King and join the Clan he's infiltrating. "You are his friend, and know him well. Do you think that's something he would do?" And even that character knows it isn't.
* [[spoiler:Conrad]] pulls one of these in ''LightNovel/KyoKaraMaoh''.
** The event reshapes the entire series and leads to huge amounts of character development--you can pretty much divide the series into 'before' and 'after' this arc, with a brief transition period between his disappearance and his reemergence as Belial's new [[TheDragon Dragon]].
** The audience is not let in on the arrangement, nor is any other living hero. We are given blatant foreshadowing of the apparent FaceHeelTurn about three minutes before TheReveal.
*** [[spoiler: Conrad]] wears a similar coat and has a similar scene in the same arena in season three, and you can see Yuuri's stomach turn over as he says half-jokingly 'not this again.' Conrad reassures him. Then he [[CrowningMomentofAwesome declares his own bid]] for the Shimaron throne [[RefugeInAudacity on the strength of]] an unbroken family line that lost power ''four hundred years ago.'' Certainly messes with everyone's [[ThePlan plans.]]
** The fact that they ''still have'' [[spoiler: Conrad's severed left arm in its original sleeve]] while he's walking around with two working arms is a big tip-off that something more convoluted happened than just the most loyal person ever deciding to betray his king, or even BrainwashedAndCrazy. [[spoiler: It's basically 'cause GodIsEvil. Or..possessed by evil. Basically God is playing XanatosSpeedChess with himself, without anyone else suspecting there's more than one will nudging the pieces. Yuuri is the culmination of the good ''and'' evil plots, because there's no way either of them would have succeeded in getting there if they hadn't built on the other's foundations for their own purposes. YouCantFightFate and yet he very much has a choice and control.]]
* In the ''Manga/{{The Legend Of Zelda Four Swords|Adventures}} Plus'' manga, [[spoiler:the Violet Link]] pulled this off in order to learn of the enemy's plans, even [[spoiler:knocking out the Green Link]] in order to prove his "loyalty".
* Chie pulls this off in ''Anime/MaiOtome'' by pretending to side with the Valkyries as part of two separate plans:
## To wrest them and any other Otomes who may have sided with Nagi from his control, and
## To [[BreakTheHaughty knock Tomoe off her high horse]], [[BatmanGambit knowing fully well that]] she would take the first opportunity to sell them all out. [[spoiler:The first part succeeds easily, but the second? Not so much, as Tomoe is too [[{{Pride}} stubborn]] to be swayed into a HeelFaceTurn, and [[VillainousBreakdown snaps]] instead]].
* In ''Franchise/{{Pokemon}}'', it is implied in the beginning of the Manaphy movie that Jack Walker had to pull off a fake defection in order to get close to Phantom and retrieve Manaphy's egg to prevent him from accessing the Samiyan Sea Temple.
* In ''Manga/{{Naruto}}'', [[spoiler:Itachi Uchiha]] of the criminal organization Akatsuki is revealed after his death to have been a double agent who was loyal to [[spoiler:Konoha]] the entire time. In fact, the real reason [[spoiler:he killed his entire clan]] was to prevent a civil war which would have devastated the village; in exchange, his superiors promised that they would [[spoiler:spare his brother Sasuke.]] Viewing his previous behavior in light of this revelation makes it pretty clear that he was doing best to delay Akatsuki and not kill anyone.
* In ''Manga/OnePiece'', in the filler AlternateUniverse ''Detective Memoirs of Chief Straw Hat Luffy'', Zoro, a traveling monk, appears to be an AloofAlly, helping out Vivi when the Buggy Clowns chased her. Buggy decides to hire him to defeat Luffy. But during the fight, Zoro intentionally has Luffy hit all of Buggy's crew. And when Mohji and Cabaji tries to attack Vivi, he stopped them.
** Recently in the story proper Brook pretends to enjoy Jora's "art" in order to trick her into changing his cane and violin back to normal so he can cut her up.
* Nancy does this with Yomiko in the ''Anime/ReadOrDie'' {{OAV}}, while quoting "to deceive your enemy, first you must deceive your friend".
* In the GrandFinale of ''Anime/SailorMoon'', [[spoiler:Sailor Uranus and Sailor Neptune do this, and even [[ShootYourMate kill Pluto and Saturn]]]] in order to gain Sailor Galaxia's trust ([[DisneyDeath don't worry, they get better]]). Of course, as it turns out, they only did it because the AppliedPhlebotinum handed out to Galaxia's henchmen was the only weapon that could defeat her. [[spoiler: Or so it seemed.]]
** This scene often appears in the ''Theatre/SeraMyu'', or stage musicals, and even has its own song.
** In an earlier arc, Sailor Moon herself feigned a falling out with the other senshi and attempted to join the Dark Kingdom so she could find the entrance to the Dark Kingdom. [[spoiler: Pity she tried this on the most cunning of the Dark Kingdom's servants...]]
* In the Hades saga of ''Manga/SaintSeiya'', all of the Gold Saints who died during the events of the 12 Temples arc are ressurected after swearing loyalty to Hades, God of the Underworld. Thus, they lead an invasion to the Sanctuary with the intent of assassinating Athena, [[spoiler:eventually succeeding it]]. We then learn that the reason behind their betrayal was to [[spoiler: a)kill Athena so she can awaken her Eighth Sense and descend into Hades's Underworld without being bound by its rules, and b)shed the Goddess's blood in order to ressurect Athena's Cloth so she can use it to fight the Lord of the Underworld.]]
* [[spoiler: Yukimura]] pulls one in ''Manga/SamuraiDeeperKyo''.
* Soul Eater in the first episode of ''Manga/SoulEater''. It's hard to tell if Maka was in on it, but if so, she's quite the actor.
* Mirage pulls one of these in ''Anime/TransformersRobotsInDisguise''. After having a genuine fight with his team, he realizes that the Predacons have been listening in and promptly takes advantage of the situation to pretend that he wants to defect.
* In the ''Manga/{{X1999}}'' anime, Arashi joins the Dragons of Earth to save her boyfriend Sorata from sacrificing himself for her. When Fuuma [[IfYoureSoEvilEatThisKitten gives her an order to kill him though]], she betrays him. [[spoiler: Sorata ''almost'' manages to take Fuuma down... but he still ends up dying for her sake.]]
* During season 2 in ''Anime/YuGiOhGX'', almost every student from the Obelisk Dorm or Ra Dorm gets brainwashed after being defeated and joins the Society of Light. However, it is strongly implied that Daichi Misawa fakes being brainwashed as his goal was only to join the Society of Light, so he will be acknowledged as a good duelist and not being ignored. Unlike others, he lost on purpose to join the Society and he never shows any arrogance like the other members, shows expression of wanting to challenge the leader Saiou, and notably, he does not lose a duel to "snap out". While he's clearly on the side of the villains at that time, he is not antagonizing the heroes either.

[[folder:Comic Books]]
* Comicbook/{{Nightwing}} becomes a fake defector in the year following the ''ComicBook/InfiniteCrisis'' storyline. This was done to give him additional credibility among several rival gangs. His success is debatable; on one hand Slade asks him to train his daughter Rose as the new Ravager, but on the other hand, his actions lead to an encounter with Comicbook/{{Superman}}. Revealing both Slade's insight and foresight, [[spoiler: Slade prepares a gizmo to give Nightwing's heartbeat the sound of a truthful man rather than a liar]].
* Post BadassDecay, Juggernaut (an [[ComicBook/XMen X-Man]] at the time) is ordered to fake-defect to gain intel on the New Bastards on the Block. Unfortunately, Juggernaut's kindred-spirit Squid Boy was not in the loop and, getting caught in the crossfire during a battle, tells Juggernaut he'll never forgive him before promptly expiring. Ouch.
* The Trickster and the Pied Piper attempted to infiltrate their old friends, Comicbook/TheFlash's RoguesGallery -- an apparent reversal of their {{Heel Face Turn}}s. When they appeared to have been complicit in the murder of Bart Allen, the Flash, they found it impossible to convince people of their sincerity.
* ''Franchise/StarWars: ComicBook/DarkEmpire'' had Luke Skywalker falling to the Dark Side, if only to try to bring it down from within.
* In ''Franchise/StarWars: KnightsOfTheOldRepublic'', Ulic Qel-Droma pretends to be a [[FallenHero fallen Jedi]] in order to take down a cult of darksiders. Unfortunately, he [[BecomingTheMask adopted the persona a bit too well.]]
* The ''ComicBook/SquadronSupreme'' limited series sees the entire team pretending to be brainwashed into joining the Institute of Evil.
* The first story arc of ''ComicBook/UltimateXMen'' has Cyclops storming off and joining Magneto's Brotherhood of Mutants. Guess why he does it.
* ComicBook/{{Quicksilver}} does this is ''ComicBook/WestCoastAvengers'', pretending to join [[spoiler:Magneto and a temporarily insane Scarlet Witch.]] He soon gets discovered, though, because he did everything he could to avoid [[ShootYourMate harming the Avengers]].
* ''ComicBook/BlakeAndMortimer'': ''The Francis Blake Affair'' involves Francis appearing to have defected, with MI6 and the police looking for him. Naturally, it was a feint to discover the identity of the MoleInCharge, although his nemesis Olrik doesn't buy it for a second.

[[folder:Fan Works]]
* In [[http://www.fanfiction.net/s/6287337/1/The_Chong_Sheng_Trilogy_Revolution The Chong Sheng Trilogy's]] third installment, [[spoiler: Mai does this]] in a particularly horrifying example. Subverted slightly in that she's also trying to avoid execution with the rest of Zuko's advisors. In order to prove it, [[spoiler: she's [[IfYoureSoEvilEatThisKitten forced to torture a captured Zuko]] while Katara is ForcedToWatch. Zuko buys the act completely at first, but Mai lets him know her true intentions by the marks she carves into his arms.]]
* In ''Fanfic/WinterWar'', [[spoiler: Hisagi]] apparently defected to Aizen during the Fake Karakura Town battle when it became obvious [[TheBadGuyWins that he was going to win]]. He did so at Yamamoto's orders... but with Yamamoto and everyone else who was in on it dead, LaResistance believes he defected for real. Even when he contacts them and offers to help them [[StormingTheCastle invade Hueco Mundo]], they have no way of knowing if he's genuinely on their side... and neither does the reader, until we get a chapter in his POV a while later.
* [[spoiler: Zecora]] in Fanfic/FalloutEquestria. Tragically, her plan to assassinate the Zebra Caesar might have worked if [[spoiler: she hadn't ran into [[SociopathicSoldier Applesnack]] during her 'escape'. He beat her to death.]]
* In ''Fanfic/SometimesIHateTheLifeIMade'', Skye fakes to side with Ultron.
* In ''Fanfic/TalesOfBleachUnrealSociety'' [[spoiler:Orihime]] joins Cruxis as one of its Seraphim, but in reality [[spoiler:she is on Kratos' side]]. Considering the person involved and a conversation that happens before this incident, the fact that it's this trope and not a true and tried FaceHeelTurn should be obvious.
* In ''FanFic/LovehammerInc'' Angron feigns pledging his Legion's allegiance to Khorne, before turning upon the War God's army and personally attacking Khorne's greatest champion.
* In ''[[https://www.fanfiction.net/s/11999389/1/The-Rehabilitation-of-Dawn-Bellwether The Rehabilitation of Dawn Bellwether]]'', after finding that the new conspiracy is led by [[spoiler: her own abusive father, Aster Bellwether]], who intends to [[spoiler: perform multiple simultaneous terrorist attacks all over Zootopia to make it a prey-only city, and ultimately a sheep-only city]], Dawn seems to revert to her old predator-hating ways. However, as soon as the other conspirators are distracted, [[spoiler: she sabotages a pump, unleashing the deadly night howler gas upon them [[HeroicSacrifice and herself]], giving her real friends a chance to escape.]]

[[folder:Films -- Live-Action]]
* There's an example of a reverse of this trope in ''Film/TheLivingDaylights'' in which Koskov pretends to defect to the West. Turns out he's playing both sides against the middle and used the defection as an opportunity to get his girlfriend offed by Film/JamesBond (who doesn't actually do it and ends up taking off her clothes later in the movie).
* Kyra joining the Necromongers in ''Film/TheChroniclesOfRiddick'', only to help Riddick when he faces the Lord Marshal in the final fight. Of course, when she joined them, she thought that Riddick was dead. It's only when he comes back does she decide to help him.
* In ''Film/XMenFirstClass'', Darwin does this to Sebastian Shaw's group of evil mutants as a ploy to give his teammate Havok a clear shot at Shaw's group (Darwin's own mutant ability will protect him from Havok's attack, and their friend but genuine traitor Angel, who wouldn't be safe otherwise). [[spoiler:[[BlackDudeDiesFirst It doesn't turn out so good for Darwin]] when Shaw's group survives unscathed due to Shaw's mutant ability allowing him to absorb Havok's attack.]]
* Interestingly done in ''Film/ThePrestige''. Angier sends his assistant, Olivia to work for Borden and feed him information. Knowing Borden would be suspicious, he tells her to admit that Angier sent her as a spy, but to claim that she was so mad at Angier for treating her like a pawn that she's willing to feed him information about Angier. In other words, the whole plan is completely transparent, both sides know full well she's working as a double agent, but neither can be sure whether she's a defector or a fake defector.
* In ''Film/TheGodfather'', Don Corleone send Luca Brasi to infiltrate the Tattaglia family to garner information on Sollozzo, but Sollozzo is wise to the plot and Luca ends up sleeping with the fishes.
* In the film version of ''Film/AbrahamLincolnVampireHunter'', [[spoiler: Lincoln's friend Speed pretends to sell Lincoln out to the vampires as part of a BatmanGambit to lure [[BigBad Adam]] into a trap. Unfortunately, he pays with his life]].
* The trope is used as a minor MindScrew to the audience and a major one to the protagonist in ''Film/TotalRecall1990'', as [[spoiler:Hauser]] tricks Quaid [[spoiler:who ''is'' Hauser, post memory wipe]] into thinking he has betrayed Cohagen when in fact it's all an elaborate gambit ''by'' Cohagen. Throw in [[spoiler:not one, but two moles]] and you've got one hell of a manipulative conspiracy.
* In the charmingly goofy family B Movie ''Mystery Monsters!'' (Released on DVD and Netflix as ''Goobers!''), protagonist Tommy's plan for freeing the monsters involves convincing BigBad Queen Mara that {{Jerkass}} Jimmy has sold Tommy and Susie out. The audience is not informed in advance, and to try to sell it that he's really betrayed them, Jimmy's HeelFaceTurn beforehand is seemingly transparently phony, with a little more than a HeelRealization that he's a selfish, obnoxious jerk who is both hated by everyone and deserves to be spurring on his desire to be something else.
* In ''Film/IRobot'', Sonny pretends to be swayed by [[BigBad VIKI]]'s "undeniable" [[WellIntentionedExtremist logic]], and suddenly holds Dr. Calvin hostage. It's all a ploy to get them safely out of the room with VIKI so they can head towards her positronic brain and shut it down, but it's only when Sonny winks at Spooner (a gesture Spooner had earlier described to him as a sign of trust) that he and the audience realize what's going on. Poor Dr. Calvin is still out of the loop.
-->'''Dr.Calvin:''' ''[as they rush up the staircase]'' I assume we'll discuss what just happened later?
* During the climax of ''Film/TheNegotiator'', Roman is trying to convince BigBad [[spoiler: Frost]] to talk, but Sabian notices that it's not working, drags Roman out of hiding, and [[spoiler: shoots him, stating that in compensation, he wants half of the money that Frost stole. Frost agrees, destroys the evidence, and walks out of the house to find that his entire agreement with Sabian was broadcast to the police, implicating him quite effectively. Sabian only shot Roman non-fatally.]]
* In ''Film/CounterfeitTraitor'', Eric Erickson is this, in the movie dramatization of what he did, as noted in the "Real Life" section below.
* In ''Film/StarTrekFirstContact'', Data is seduced by the Borg Queen with the promise of becoming more human by having human skin grafted onto his body and serving as her consort. He pretends to join them by deactivating the ''Enterprise''[='s=] self-destruct and firing at the Phoenix... and deliberately missing. He gets to deliver a BadassBoast ("Resistance. Is. Futile.") before killing the Borg Queen and defeating the Borg single-handedly. Data notes that he actually considered the offer for 0.68 seconds -- for an android like him that is an eternity.
* A long-term example in ''Film/TheGoodShepherd'', where a Soviet defector named Valentin Mironov spends years working with [[Creator/MattDamon Edward Wilson]] in Wilson's counterintelligence unit. Another Soviet defector later shows up to claim that he's the real Mironov, while the first one is actually Yuri Modin, a KGB agent. They don't believe the second "Mironov" and torture him until he jumps out a window to his death (it doesn't help that he's dosed with LSD at that point). The first "Mironov" offers to take a polygraph test to prove that he is who he says he is, but Wilson refuses. Later, though, Wilson shows up on Mironov's doorstep in the middle of the night and demands that Mironov play his accordion. When Mironov agrees and asks why, Wilson replies that he wanted to finally hear something from "Mironov" that was true. Obviously, he figured out that the second "Mironov" was the real deal.
%%* ''Film/TheHungerGames'': Peeta, when he allies with the careers.
* Loki in ''Film/{{Thor}}'' was raised believing that the Frost Giants are monsters and the arch enemy of Asgard. After being told by Odin that he actually is one that Odin and his wife adopted centuries ago, he tricks his biological father Laufey into believing that he wants him to kill Odin, only to kill Laufey himself, [[EngineeredHeroics making it look as if he saved his adoptive father's life]] and hoping to [[WellDoneSonGuy regain his love this way]].
* In ''Film/PiratesOfTheCaribbeanTheCurseOfTheBlackPearl'', [[MagnificentBastard Jack Sparrow]] briefly fakes a betrayal to [[LargeHam Barbossa]]'s side at the end of the movie, only to use it to arm himself and Will in preparation for the final battle.
* Twice in ''Film/{{Deewaar}}'':
** Vijay tells Samant when and where Daavar's gold shipment will arrive, so Samant can steal it. He also promises to give Samant more valuable information. It doesn't last long, however; immediately after, Vijay steals the gold right back.
** Darpan tells Samant where Vijay will be at a given point, so Samant can have him killed. The whole thing was Vijay's plan to get a mole inside Samant's organization.

* ''Literature/ASongOfIceAndFire'':
** The ''[[HonorBeforeReason beyond]]'' [[HonorBeforeReason honorable]] Jon Snow becomes a fake defector in order to spy on the wildling king, Mance Rayder, for the Night's Watch at the orders of his superior officer, Qhorin Halfhand; he is forced to kill [[spoiler: Qhorin Halfhand]] as Qhorin ordered him to do in order to gain the trust of the wildling leaders. And then to have sex with his new wildling girlfriend every night to maintain their trust. How ''else'' would he convince them he's forsworn those vows of chastity he honors so much? He ''does'' feel very bad about all this. During his role as fake defector -- though he comes to see ordinary wildlings as regular men, women and children and feels compassion for them -- he learns of the wildling king's plans to attack the Wall and must work to prevent this and warn the Night's Watch. He comes to fall in love with aforementioned wildling girl but must leave her as he has always been loyal to the Night's Watch and must fulfill his duty.
** The Westerling family counts as well. The family is of minor nobility and are sworn to the Lannisters. After their daughter Jeyne, likely the only family member who doesn't fit this trope, marries the King in the North, Robb Stark, leader of one of the armies opposed to the Lannisters in the War of Five Kings, the Westerlings pretend to declare loyalty to the Starks. However, Robb's direwolf Grey Wind, an EvilDetectingDog, indicates that something is wrong about the family. Later, Jeyne's mother reveals to Jaime Lannister that she has been in contact with his father, Tywin Lannister, the head of the Lannister family, and was aware of the planned betrayal of Robb Stark at the hands of one of his sworn families. She also gave her daughter drugs to prevent conception, thus ensuring the male line of the Stark family died with Robb (or so she thought).
*** [[spoiler: Wyman Manderly, ever loyal to the Starks]], pretends to defer to the [[spoiler: Freys and Boltons]] when it's really all a ruse to [[{{Pun}} dish up]] some revenge of his own.
* Fiona Samson in the ''Literature/BernardSamsonSeries'', who was playing this for a seriously long time.
* Creator/JohnLeCarre novels use this a lot - with large amounts of detail on how you go about doing this (slowly dropping out of society, becoming a drunk, etc). Alec Leamas's defection to East Germany in the first half of ''Literature/TheSpyWhoCameInFromTheCold'' is probably his most famous example.
* Successfully pulled by [[spoiler:Sir Horace Harkness]] in the ''Literature/HonorHarrington'' series, when their ship was taken by Havenite StateSec. A life of [[AntiHero smuggling and bootlegging]] certainly paid off -- he managed to deceive his watchdogs, hack the enemy ship's central computer, free his mates, and blow the entire ship to Kingdom Come after making a clean getaway. He was deservingly [[spoiler:knighted]] for this performance.
* [[spoiler:Professor Severus Snape]] of the ''Literature/HarryPotter'' series. Interestingly, he defected to both sides at different points, so we're kept guessing for most of the series about which side he's a ''fake'' defector to. (Fans debated it to hell and back.) It all ends with a very unusual twist: his deception is successful but [[spoiler: his mission fails. Voldemort believes Snape, but kills him anyway, out of expediency. That said, he was able to prevent a whole lot of worse abuse towards the students of Hogwarts using his position as Headmaster, and was able to give Harry his all-important memories about Voldemort's extra Horcrux, so in a way he succeeded.]]
* Subverted in ''Emperor: The Gods of War'' by Conn Iggulden, where [[spoiler:Brutus actually has done a face-heel turn and betrayed Caesar. However Caesar and his generals play it out as a fake defector, and even Brutus himself does so in order to get into Caesar's daughter's bed.]]
* In ''Literature/WatershipDown'' Bigwig tells the [[PoliceState Efrafans]] that he's a member of the [[CityGuards Owsla]] who escaped the destruction of his warren by Men, which is true except Bigwig neglects to mention that he's part of a group of similar refugees hoping to spring some of the Efrafan does for their own warren.
* Lara of the ''[[Literature/XWingSeries X-Wing]]'' series started off as a bad guy playing TheMole in the New Republic. She caused the near-total destruction of an X-wing squadron, then went back to the Imperials, got disgusted by her newest boss's insistence that WeHaveReserves, and engineered his death. Then, awaiting another chance, she went undercover among the New Republic again, joined an X-wing squadron, and started BecomingTheMask and finding that GoodFeelsGood, so she switched sides and started getting close with the only survivor of the X-wing squadron she'd destroyed. ''Then'' her true origin was revealed and she was forced to flee and rejoin the bad guys as a fake defector, contributing to a major New Republic victory. It ends [[spoiler: on a bittersweet note at first (she has to live the rest of her life under a different identity to avoid being condemned to death for her actions as an Imperial agent), but a later book shows that things went all the better for her, as she started both a family and a successful business with the aforementioned survivor.]]
* In Creator/OrsonScottCard's novel ''Literature/ShadowPuppets'', Suriyawong spends most of his time working his way up to being the BigBad's second-hand man [[spoiler:so that when the time comes he can give the good guys a chance to shoot the BigBad in the head]].
* In Creator/TimPowers's novel ''Literature/{{Declare}}'' his protagonist Andrew Hale is more or less shoved into making a false defection in order to get close to his nemesis Kim Philby.
* In Creator/SandyMitchell's TabletopGame/{{Warhammer 40000}} ''[[TabletopGame/DarkHeresy Scourge the Heretic]]'', when they are [[TheInfiltration infiltrating a smuggling operation]], Kyrlock claims to have deserted the Imperial Guard and need to escape. Later, [[spoiler:when their guide [[AttemptedRape attempts to rape]] a girl also waiting to be smuggled, and Elyra is unable to get him to back down, Kyrlock tells him that while Elyra doesn't want to share, he would be willing. This [[EvilCannotComprehendGood lets him get close enough]] to bring the man down. Though it is over in a couple of minutes, Elyra is nearly convinced that he means it; when he says [[PowerOfTrust he knew she would back him up]], she is embarrassed and can not admit how close it came.]]
* Happens many times in ''Literature/RomanceOfTheThreeKingdoms''. Especially noteworthy is just before the battle of Chi Bi; after Cao Cao's loyal admiral is executed [[FeedTheMole thanks to a plot of Zhou Yu's]], the admiral's brothers use it as a cover story for their supposed defection. However, they are easily discovered, but Zhou Yu just proceeds to [[FeedTheMole play along]] so as to plant his own Fake Defector to defeat Cao's giant navy.
* Also common in Kamakura-era retellings of the ''Literature/TaleOfGenji''. Many scenes in Genji make it clear that Genji was having an affair with the Emperor's chief wife, and even fathered her child. To avoid the unpatriotic implications, the retellings would have them go through the same conversations... but later reveal they were faking the whole thing to fool their enemies! And then NINJAS ATTACK!
* As of ''[[Literature/TheWheelOfTime The Gathering Storm]]'', [[spoiler:Verin]] is revealed to be one of these, having [[spoiler:joined the Black Ajah to save herself, then studied it and eventually brought it down from within. Considering how well she fooled her fellow Blacks, and the LoopholeAbuse she used to be able to divulge all (which also entailed a HeroicSacrifice),it's tempting to call her a [[MagnificentBastard Magnificent Bitch]] despite still being one of the Heroes. She's certainly mistress of ThePlan.]]
* Briefly done by Ax, of all [[strike:people]] Andalites, in ''Literature/{{Animorphs}}''. It was a spur-of-the-moment idea, and he only stuck with it long enough to get into a better position to fight back.
** In a more extended version, Ax fakes defecting to, er, his own side, technically--when a small Andalite squad comes to Earth, the Animorphs (rightly) suspect their motives and pretend to break up, freeing Ax to go join up with the Andalites and find out what they're up to.
* In Creator/TomClancy's ''[[Literature/JackRyan Cardinal of the Kremlin]]'', Jack Ryan pulls this, staging several 'incidents' to trick the Russians into trying to recruit him, including a rather public incident involving a gay senator. He's not actually going undercover, though -- he just needs to arrange a one-on-one with the KGB Chief, so he can blackmail HIM into defecting, bringing along the titular [[TheMole mole]].
* In the ''Franchise/StarTrek'' [[ExpandedUniverse Double Helix]] novel "Double Or Nothing", Mackenzie Calhoun needs to infiltrate the Big Bad, so he punches out an admiral. (He was supposed to have a loud argument with him, but he decided that he needed to be punched...to make the charade more authentic, of course). [[spoiler:It is subverted, however, in that the Big Bad sees right through it and keeps it hidden until the big moment.]]
* The female lead of the ''Literature/JamesBond'' novel and film ''Literature/FromRussiaWithLove'' was told that her mission was to become one of these to leak false intelligence to the West. [[spoiler: Her mission is actually a set up to lure Bond into a situation where SMERSH/SPECTRE (Depending on the adaptation) can kill both of them in a manner that embarrasses the British government.]]
* In Literature/TheDresdenFiles novel ''Literature/{{Changes}}'', [[spoiler: Martin]] pretends to defect to the Red Court, serving as a DoubleAgent and setting up [[spoiler: their total destruction]]. The protagonist was incredibly surprised, naturally.
* In ''Literature/LuckyStarr and the Rings of Saturn'', Lucky Starr allows himself to be captured by Earth's enemies, the Sirians, and then gives away one of his fellow Councilmen of Science to the Sirians and testifies about his betrayal for Sirius at an interstellar conference. [[spoiler:Of course, it's all an elaborate ploy to get on the stand and present testimony that is devastating to Sirius.]] The act is especially hard on Lucky's sidekick and best friend Bigman, [[WeWouldHaveToldYouBut who believes Lucky is turning traitor in exchange for his, Bigman's, life]].
-->'''Lucky:''' [You] gave me the opportunity to make it look as though I were sincerely swapping Wess's freedom for your life. It took less acting to do that than to give Wess away under any conditions I could have dreamed up in your absence. In fact, as it was, [[HeartwarmingMoments I didn't have to act at all]]. It was a good swap.
* In ''Literature/TheHungerGames'' it seems like Peeta has teamed up with the careers to kill Katniss. In actuality he teamed up with them to lure them away from her and help keep her alive.
* In ''Literature/ChristianNation'', the protagonist convincingly fakes being "born again" so that he could escape being executed by the American theocratic government.
* In ''Literature/TheBlackCompany'' you have [[spoiler:Blade,]] who "defects" after Croaker suspects him of having an affair with [[spoiler:Lady, Croaker's wife.]] In the months long con that followed, Croaker repeatedly sent the religious fanatics of his own army against [[spoiler:Blade's forces, thinning his pressed army of the malcontents while Blade turned nearly his entire enemy force to the Company side.]]
* Seen in the ''Warrior'' trilogy of ''[[Franchise/BattleTechExpandedUniverse BattleTech]]'' novels about the Fourth Succession War, with not a clue whatsoever to an uninitiated reader until {{the Reveal}} late in the final novel. Of course, the surprise will likely be lost on most modern readers already familiar with the universe's backstory who'll recognize the name [[spoiler:Justin Xiang Allard]] easily enough; it worked better when the books (some of the first ever written) were still new.
* In ''Literature/WarriorCats'', it appears that Tigerheart is eagerly following his grandfather [[BigBad Tigerstar]]'s teachings, but he's really spying on Tigerstar and the Dark Forest, unbeknownst to the reader and other characters (even Ivypool, who worked as a spy herself after joining and realizing that they're really hell-bent on destroying the Clans.)

[[folder:Live-Action TV]]
* [[spoiler:Wolf]] of ''Series/TheTenthKingdom'' is a particularly well-done version of this trope. It keeps you guessing, even right up to the very end, which side he will truly turn out to be on. It helps that, as a deconstruction of many fairy tale tropes, Happy Ever After was not guaranteed by any means, and the ending [[BittersweetEnding still remains rather dark]]...
* ''Series/GameOfThrones'':
** After Winterfell is taken by the Ironborn, Osha offers to pledge herself to Theon supposedly to save her own ass. In actuality, she is revealed to be doing it to gain Theon's trust and to allow her to help Bran, Rickon, Hodor and the direwolves escape Winterfell.
** [[HeroicBastard Jon Snow]] joins the wildlings in ''Valar Morghulis'' and remains with them throughout Season 3, convincing them that he's a ''bona fide'' defector. Killing [[spoiler:Qhorin Halfhand]] (under Qhorin Halfhand's orders) in a one-on-one combat, along with his admission that he ''was'' unhappy with Mormont's decision to ally with Craster, went some ways toward convincing the wildlings. That being said, subtlety is ''definitely'' not Jon's strong suit, since both Orell and Ygritte immediately pick up on the fact that he's working as a Fake Defector.
--> '''Ygritte:''' You're ''loyal'', Jon Snow.
* Spock did this in ''Series/StarTrekTheOriginalSeries'' episode "The Enterprise Incident" to help Kirk steal a Romulan cloaking device.
* ''Series/StarTrekTheNextGeneration''
** In the two-parter "Gambit", Picard (rather inadvertently) [[TheInfiltration goes undercover]] with a group of SpacePirates; when Riker shows up, Picard sets him up as the fake defector to keep him alive. Meanwhile they had to act like [[WeDoNotKnowEachOther they didn't know each other]] and would happily kill one another.
** In the appropriately titled "The Defector", a Romulan officer falsely claims to be a middle-ranking clerk of negligible importance who had come across some important information about a secret base which the Romulans planned to launch an attack on the Federation from. [[spoiler:His defection was sincere, but he was lying about his identity. He wanted to warn the Federation about the attack so a war could be prevented, but he did not want to further betray his homeworld. He finally admits that he is an Admiral and agrees to hand over any required information to the Federation. Tragically, it turns out that he is the UnwittingPawn, [[FeedTheMole fed false information]] by [[MagnificentBastard Commander Tomalak]] to lure the [[CoolShip Enterprise]] into crossing into the Neutral Zone first so they could ambush them and justify an invasion of the Federation. Fortunately, [[BaldOfAwesome Captain Picard]] arranged ahead of time for the [[TheCavalry Klingons]] to sneak in with them in case they needed rescuing. Both sides retreat without a war starting.]]
* ''Series/StarTrekVoyager''
** A subtle variation, over multiple episodes of Season 2. [[spoiler: Tom Paris starts showing up late, picking a fight with his superior, starts the crew gambling. He lines up a new job and is leaving the ship forever.]] Instead of getting approached by the other side they decide to kidnap him, exactly according to plan.
** In "Counterpoint" [[spoiler: an officer for an anti-telepath society seeks sanctuary on ''Voyager'', claiming to have never really agreed with the policy and to have worked to stop his subordinates finding out how ''Voyager'''s crew were smuggling refugees. It turns out to be an elaborate sting to find the wormhole the refugees are escaping to and destroying it. Janeway [[OutGambitted out-gambits]] him]].
* Jack Bauer in ''[[Series/TwentyFour 24]]'' series 3, breaking out Ramon Salazar from prison was [[GambitRoulette an elaborate sting operation]]. In order to convince the Salazars that he had gone to the bad side, he had to point an (unloaded) pistol at Chase's head and [[ShootYourMate pull the trigger]]. He is assisted by Gael Ortega, who goes so deep undercover as a mole that CTU arrests and interrogates him before realizing their mistake.
** This is in addition to the cocaine habit he starts in the same season to convince Salazar of his defection. [[MemeticBadass Proving once again that Jack Bauer is a badass.]]
*** Done again by [[spoiler: both Tony Almeda and Jack]] in the season 7. Also [[spoiler: Greg Seaton]] fakes a bad-to-good defection.
* Jack Bristow in ''Series/{{Alias}}'', pretending to leave the CIA to work for SD-6.
* Gary Best in ''Series/TheBill'', whose undercover assignment involved faking his sacking for assault. Adam Okaro and Lewis Hardy also did this. The latter shot to miss Roger Valentine.
* ''Series/MissionImpossible'' had at least one such episode, if not more. And then there are the episodes where they have to convince an enemy agent that a real defector is actually a fake defector so that [[CassandraGambit the intelligence they leaked will be disregarded.]]
%%* ''Series/MiamiVice'' had one of these as well.
* Same can be said for ''Series/StarskyAndHutch''.
* The abrupt SeriesFinale of ''Series/{{Angel}}'' involved a similar device.
** In an earlier episode, Angel {{Neck Snap}}ped his teammate (who was part demon and able to survive such an attack) to get a Nazi-like team to accept him so he could figure out their plans.
* In an episode of ''Series/GetSmart'', Max is "fired" from CONTROL and becomes a drunk, all part of a scheme to get him approached by KAOS so he can learn their latest evil plan.
** It turns out to be somewhat pointless, [[spoiler: as it turned out that the KAOS unit was long defunct, and being run by [[FlockOfWolves infiltrators]] from various government agencies.]]
* ''Series/LawAndOrderCriminalIntent'' has an episode where Goren is forced on leave and ends up working with some bad cops, and his partner nearly shoots him. Yeah, it was all planned by Goren and the captain.
* ''Series/BuffyTheVampireSlayer'':
** In the season 3 episode "Enemies," Angel pretends to have turned into his [[SuperPoweredEvilSide evil alter ego]] Angelus. Buffy is in on the plan, but the audience doesn't find out until [[CrowningMomentOfAwesome the moment when Angel reveals himself.]]
** Angel used a much shorter version of this in Spike's first episode. During Spike's attack on Sunnydale High, he strolled right up with Xander in a headlock, claiming to have been playing Buffy. Spike didn't buy it, having known Angelus ''much'' better than [[spoiler:Faith]] did.
* In several episodes of the second season of ''Series/StarTrekVoyager'', Tom Paris becomes sullen and insubordinate so his fake defection (part of a mission to root out an informant) looks real. He goes as far as setting up a gambling ring and skimming from the betting pool to increase the appearance of an unreliable, unethical officer.
* ''Series/{{Battlestar Galactica|2003}}'':
** In order to get to her daughter on board a Cylon Baseship, Athena tells Caprica Six that she thinks that Hera is safer there.
** [[spoiler: Boomer]] does that too. [[spoiler: Ellen]] thinks that [[spoiler: Boomer]] helped them escape. [[spoiler: Boomer]] only pretended so to get access to ''Galactica'' and steal [[spoiler: Hera]].
* ''Series/StargateSG1'':
** In the episode "Shades of Grey", Colonel O'Neill gets suspended from duty for stealing technology from aliens. This allows him to infiltrate a group of bad guys, but in the process he alienates his team, who are quite shocked at his behaviour (not being in on the plan). Of course, they're all friends again by the next episode. Interesting thing is that in that episode Daniel appears to have a friendly talk to Jack at the end, and reveals he came because he lost the draw.
** Teal'c fools Ba'al into believing he was brainwashed in "Stronghold".
** Teal'c is also brainwashed by Apophis into thinking that he was this trope, when he was "really" still loyal to Apophis.
** Carter also had to pretend to be infected by a Goa'uld symbiote clone among an entire town infected by them to trick them into being arrested by the SGC. In order to sell the deception, she also had to hit one of her allies beforehand. It worked because Carter was once the unwilling host to a Tok'ra symbiote (same species, different ideology), and any host or former host has some [[{{Unobtainium}} naquadah]] in his or her blood that can be sensed by a symbiote.
* Mason Drake in ''Series/LoisAndClark''. Immediately after Lois and Clark agree to share their information with her (against Lois' judgment), she's sharing it with Intergang's TheDragon. Immediately after ''that'', though, it turns out this is part of Lois' plan to [[EngineeredPublicConfession make him incriminate himself on tape]].
* The opening quote of this article, from ''Series/StarTrekDeepSpaceNine'', turned out to be in a holodeck scenario. But the scene was such a perfect fit to Garak's devious personality that most fans forget he didn't really do it.
* In ''Crime Story'', the lawyer for the Federal task force that is trying to take down BigBad Ray Luca, pretends to be drunk and gets kicked out of the agency, so that he can become Luca's lawyer, and then inform the task force about everything Luca is doing. However, Luca points out to one of his henchmen who questions whether the lawyer would be loyal to Luca, that even if this lawyer was pretending to go to his side, because of lawyer-client confidentiality rules, nothing he tells the feds can be used against him.
* In season four of ''Series/{{Chuck}}'', Sarah pretends to betray her team in order to infiltrate Volkoff Industries to rescue Chuck's mother.
* Bo pretended to be a dirty cop for a while on ''Series/DaysOfOurLives''.
* ''Series/{{Lost}}'':
** In the episode "The Economist," we see Hurley questioning Locke's leadership. In his next scene, he tells Sayid and Kate that he has abandoned Locke's group. It turns out to be a ruse, to which the audience was kept in the dark.
** Benjamin Linus pulls this in "What They Died For", even going as far as to [[spoiler: kill Charles Widmore (though that part probably wasn't an act)]] to convince the Man in Black where his loyalties lie. Oddly enough, he doesn't actually accomplish much, other than to [[spoiler: allow Miles and Richard to escape the Man in Black's wrath and eventually get off the island]].
* Sgt. Miller pretended to collaborate with a criminal gang in an episode of ''{{Series/Heartbeat}}'', though the writers didn't even try to explain why he didn't tell the other police what was going on.
* Hiro from ''Series/{{Heroes}}'' [[spoiler: pretends to stab Ando with a katana in order to join the other side.]]
* In the ''Series/PushingDaisies'' episode "The Norwegians", Olive resents the fact that she is perpetually LockedOutOfTheLoop and decides to join the Norwegian detective team that is trying to put Emerson out of business and would have exposed Ned in the process. It's revealed that she was faking all along in order to throw them off the track.
* {{Sentai}} examples:
** In ''Series/KousokuSentaiTurboranger'' Pink Turbo winds up joining the bad guys in attempt to recover an antidote for the poisoned Blue Turbo by fighting alongside the monster of the week and "accidentally" getting poisoned by it as well forcing it to give her the antidote. Oddly enough this didn't seem to be planned in advance at all, she just happened to take a hit to her head during a battle and decided to [[FakingAmnesia fake memory loss]] to join the bad guys. The other guys had no idea what she was doing until the Reveal when Blue was shown to be healed. She even was perfectly willing to shoot a machine gun at them as part of her plan.
** ''Series/ChourikiSentaiOhranger'' repeated this plot only this time had it fail. Ohyellow joins the bad guys in attempt to recover an antidote however unlike Pink Turbo faking amnesia Ohyellow faked cowardice and surrendered instead. Ohyellow also lets herself get hit by the poison darts and tries to get the antidote however she wore a bulletproof vest to protect herself unlike Pink Turbo who allowed herself to be poisoned. Since Ohyellow doesn't take as many risks the bad guys aren't fooled and give her a fake antidote instead. They then need to use a backup plan instead.
** A not-so-much copy-paste-from-Turborangers Fake Defector plot is also shown in ''Series/ChoujinSentaiJetman'', the 'fake defector' none other than [[TheHero Red Hawk]] himself, pretending to join the bad guys so they will return his girlfriend-turned-evil. Turns out he was trying to sneak into their base and destroy their mean to transport themselves into the real world. Plan failed, but in the end, their chief praised him and his teammates for being powerful and cunning enough to break through the enemy's defenses.
** Happens again in ''Series/BakuryuuSentaiAbaranger''; Maharo (who was [[TheDragon a dragon]] for the villians before her HeelFaceTurn) makes a deal with Abarekiller and rejoins the villians with all of her former power restored. The heroes quickly learn that this is all part of her plan to A) free Asuka from the dark armor and B) get close to the Big Bad and wait for a chance to strike. The first half of her plan goes smoothly, but not the second half.
** ''Series/KaizokuSentaiGokaiger'' has Luka attempt this to free herself, Joe, Don and Ahim in episode 16... and [[spoiler:it fails right off the bat, because Basco, the one who had kidnapped them, didn't buy it for a second.]]
** And in the other hemisphere, Kat tried this in an episode of ''Series/MightyMorphinPowerRangers''; when Tommy went to search for the Zeo Crystal (a powerful magical item Master Vile wanted, that had been protected from him with a spell that would destroy anything evil that touched it), Kat thought she could buy Tommy time by approaching the Zedd and Rita and saying she wanted to rejoin them. Unfortunately, they showed surprising genre-savvyness (for them) this time, and wouldn't trust Kat unless she first submitted herself to a brainwashing device (not mentioning until she agreed to this that it would be irreversible once complete, also mentioning then that Tommy's past as the Green Ranger would still cause the spell protecting the Crystal to react. (He still managed, even having to struggle through some personal demons to do so, and got back in time to rescue Kat and the Ninja-Falconzord too.)
** [[BigBad King Mondo]] had a MonsterOfTheWeek use this trick in ''Series/PowerRangersZeo''. (The viewers knew what the plan was, but the heroes didn't, so you honestly can't blame the Rangers for wanting to believe the guy was sincere.)
** ''Series/PowerRangersOperationOverdrive'' involves a Fake Defector plot when the Rangers need to acquire a Houou statute from a villain faction.
* Done in ''Series/TheUnit'', which takes it pretty far... [[spoiler: Sam [=McBride=], to find BigBad Leon Drake, "attempts" to rape Bridget Sullivan (who isn't in on this), engages in a shootout and kidnaps Molly Blaine. The result of this is Molly separating from Jonas and Jonas telling Colonel Ryan that he's no longer fit for command, to which Ryan eventually agrees, taking a promotion]].
* ''Series/{{Farscape}}'':
** It is revealed late in season 4 that Scorpius has pulled one of these on the Scarran emperor. For a time, it is unclear if his devotion to the Peacekeepers was the real fake, but when he helps destroy the Scarran's evolutionary edge, it becomes obvious that his loyalties never lay with them.
** Same season, Braca. He appeared to have switched his loyalties to Grayza following the destruction of Scorpius' Command Carrier at the end of Season 3 - gleefully aiding in torturing him for information and even shooting him. However, it was all part of another of Scorpius' plans. Braca even acted as TheMole for Scorpius while the half-breed was hiding out on Moya.
* ''Series/DoctorWho'':
** Adric does this not once but ''three times'' during his tenure as a companion. Unfortunately, most fans miss the "fake" part (except in "Four to Doomsday" where he actually ''does'' side with the villain, but only because [[HorribleJudgeOfCharacter he seriously believes that Monarch's intentions are benevolent]]) and use it as credibility towards his status as TheScrappy.
** The Doctor himself does it in "The Almost People" when he briefly pretends to be in on the doppelgangers' murderous plan so that he can undermine it later.
** And again in "The Claws of Axos," when the Doctor pretends to abandon Earth to the Axon menace to escape with the Master in his TARDIS, only to lure the Master into the heart of the Axos alien being and deal with them both.
** Canton Everett Delaware III in between "The Impossible Astronaut" and "Day of the Moon", to get Amy, Rory, River, and the Doctor all back in one place.
* Mulder of ''Series/TheXFiles'' does this in season five's "The Pine Bluff Variant". He even had to hide it from Scully, who was not pleased that she was kept out of the loop.
* During the oft-maligned Leviathan story arc of the cult classic Gothic soap opera ''Series/DarkShadows'', several characters who had managed to resist or overcome the power of the Leviathan cult later pretended to fall back in with said cult in order to help take it down.
* In an episode of ''Series/ArrestedDevelopment'', Michael and Gob formulated a plan to get back at Oscar for his cruel pranks on them as children which drove the two brothers apart. Gob immediately went to Oscar and told him the plan, or so it seemed. Gob's defection was fake and part of the plan from the beginning. It was believable because Gob would have had no qualms about betraying Michael for real.
* Jane attempts this in the fourth season finale of ''Series/TheMentalist'', hoping to convince Red John that he'd truly given up and was willing to join him. He even goes so far as to [[spoiler: pretend to kill Lisbon and bring her head to Red John as a gift]]. Needless to say, things didn't go as planned.
* Steve Jinks in ''Series/{{Warehouse 13}}'' is fired after pulling a gun on Mrs. Frederic when she insisted on torturing a detainee. He's then recruited by TheDragon to work for the BigBad. The whole thing was planned by Mrs. Frederic and Jinks off screen, and they were the only ones in on it until Jinks revealed the plan to Claudia late in the game. [[spoiler:Unfortunately, Sykes has his [[TheDragon Dragon]] kill Jinks after his usefulness runs out. Fortunately, Claudia manages to revive him with Johann Maelzel's Metronome, and Jinks reconnecting with his estranged mother in a later episode brings him back fully]].
* On ''Series/BrooklynNineNine'', at the end of season 1, Jake Peralta goes undercover into the mob and pretends as if he was fired from the NYPD and now harbors bad feelings towards them.
* On ''Series/KamenRiderExAid'', Kamen Rider Lazer/Kiriya Kujo is revived by the series' true BigBad [[spoiler:Masamune Dan]] and is originally shown to be sided with [[spoiler:Masamune's]] side instead of Emu/Ex-Aid's side. Turns out, [[spoiler:all of this is a ploy by him to swipe back the Proto Gashats that Masamune stole earlier in the story, taking full advantage of his tendency to lie to fool Masamune that he has willingly joined his side following his revival.]]

[[folder:Myths & Religion]]
* In ''Literature/TheAeneid'' and ''Literature/TheOdyssey'' Sinon surrenders to the Trojans, after claiming to have defected from the Greeks, for the express purpose of convincing the Trojans that the Trojan horse was a gift. He also added the detail that they [[SchmuckBait under no circumstances]] should bring it into the city because then it would make the city invincible. You know the saying "never trust Greeks bearing gifts?" In context that's actually about Sinon in specific. OlderThanFeudalism.
* In the Biblical Literature/BookOfJudith (considered Apocrypha by Jews and, following them, Protestants), our heroine convinces the Assyrian general Holofernes who is besieging her city that she will betray the Jews to him. Then she waits for him to get drunk and [[http://en.wikipedia.org/wiki/File:Caravaggio_Judith_Beheading_Holofernes.jpg does this.]]
* In 1st Samuel, David decides to offer his services to a Philistine lord in order to hide himself from King Saul. It works for a little over a year until the other Philistine lords see him and the other Hebrews with David and suspect that he is this trope working undercover to take down the Philistines from within in order to please his "true master".

[[folder:Tabletop Games]]
* In the ''{{TabletopGame/Battletech}}'' universe done by [[spoiler:Justin Allard whose fall from grace was manufactured to give him credibility with Capellan Confederation]]
* In ''TabletopGame/{{Warhammer 40000}}'', the Alpha Legion's true allegiance is to the Emperor, in the most twisted way possible.
* In ''TabletopGame/WraithTheOblivion'', an entire Guild, the Mnemoi, pretended to become corrupt to hide that they had been entrusted with saving the memories of Charon, ruler of Stygia, until he could come back. Unfortunately, it worked a little ''too'' well; the Mnemoi were hunted down fanatically, and by the time Charon did return, so many of his memories were missing because those who held them had been destroyed.

[[folder:Video Games]]
* ''VideoGame/MetalGearSolid3SnakeEater'' is a deconstruction of the trope. [[spoiler:The Boss]] "defects" to the side of BigBad Volgin, but after Volgin decides to nuke one of his research facilities from an American plane she provided, using an American "Davy Crocket" launcher it was carrying, the U.S. top brass shifts the blame for the incident onto [[spoiler:The Boss]] to cover their own asses ([[spoiler:which [[HeroicSacrifice she willingly went along with to protect her country's interests]]]]), and her defection suddenly becomes a one-way street, making it necessary for Snake to kill her in order to prevent WorldWarThree from erupting. Tragically, Snake learns her defection was fake only after her death.
** It gets even worse in ''[[VideoGame/MetalGearSolidPeaceWalker Peace Walker]]'', when it is revealed near the end that [[spoiler: Not only was the launching of the nuke planned, but the true objective of both the Virtuous Mission and Operation Snake Eater was to kill off The Boss from the start by a single deviously cunning strategist. Coldman even admits (with a sickening amount of glee and satisfaction) that he was the one who set The Boss up.]]
** In every single ''VideoGame/MetalGearSolid'' game (up through 3 at least), in fact, [[spoiler:Revolver Ocelot is a fake defector]] to whomever the current game's BigBad is. He always, ''[[DoubleAgent always]]'' double-crosses his apparent boss at the end. Even more than that, he's not even typically working for the people he "defected" from, but is solely loyal to [[spoiler:the Pro-Big Boss faction]].
*** In fact he gave [[ChronicBackstabbingDisorder such behavior]] its [[TropeNamer name]].
*** Other than the chronic backstabbing moments, Ocelot's backstory is that he originally worked for the NSA until he and a colleague of his defected to the Soviet Union. However, it was suggested to be a fake defection due to still working for the CIA. [[spoiler: [[LikeFatherLikeSon Like mother, like son]].]]
* One story option, which will happen most of the time in ''VideoGame/TalesOfSymphonia'' unless you [[spoiler: choose Kratos at the Flanoir doctor scene]], features [[spoiler:Zelos doing this, in part to get one of the required elements to create the Eternal Sword. In the other story path, he really does join the villains and you have to kill him.]]
** If you piece all the story together, Kratos plays with this trope as well. [[spoiler:Ultimately, Kratos doesn't believe in Mithos' vision of the world, but his inherent fatalism -- and the knowledge of what happened last time he tried -- keeps him from truly abandoning the Cruxis leader. This leads to Kratos playing the two of you up against each other and helping in his own fashion, hoping that ultimately Lloyd will win so Kratos will be able to die. He'll never actively oppose Mithos unless you choose him in the aforementioned scene, however.]]
* Subverted in the UBW route in the ''VisualNovel/FateStayNight'' game by [[spoiler:Servant Archer]], defecting to one side, betraying ''them'', then turning around and attacking his ''original side'', revealing himself to have been [[ThePlan acting in his own personal interests all along]].
* Jowy Atreides from ''VideoGame/SuikodenII'' is an archetypical example of this trope (and a classic [[TheStarscream Starscream]]. Originally the main character's best friend and ally in the oncoming war against the demonic and [[AxCrazy psychopathic]] [[TheCaligula Prince]] Luca Blight (not the Luca above), he betrays said best friend and joins up with Luca, believing that the only way to stop him is from the inside. His plans are successful and in the end of the game, you can choose whether to fight him to the death of not.
** [[spoiler: Sialeeds]] does this when she betrays the heroes in ''VideoGame/SuikodenV'' for the same reasoning as Jowy's: kill the corrupt people of the Senate from the inside so that no one will oppose the [[TheHero Prince]] and Lym.
* Axel in ''VideoGame/KingdomHeartsChainOfMemories'' pretended to help [[TheStarscream Marluxia]] for most of the game (even killing [[spoiler:Vexen]] in the process), then turns around and ruins his plans.
* The "staged breakdown" version of this is the premise of ''VideoGame/SplinterCellDoubleAgent'', except that the death of Sam's daughter was very real; that MythArc is to be continued in ''Conviction''.
** Except ''[[VideoGame/SplinterCellConviction Conviction]]'' reveals that [[spoiler:Sam's boss hid Sam's daughter away and faked her death]].
* [[spoiler: Megan Kher]] in the Playdom game VideoGame/GardensOfTime. [[spoiler: With help from [[TeamDad Alistair]] and [[FieryRedhead Eleanor]], she pulls this on none other than ''Julius Caesar''. Or better said, his younger and {{face heel turn}}ed self. [[ItmakesSenseInContext It's a long story]].]]
* In ''VideoGame/LunarTheSilverStar'', when the party obtains the Dragon Helmet, Nash betrays them and takes it to Xenobia. He couldn't explain beforehand that he was planning to double-cross the Vile Tribe, and he returns injured but with the Dragon Helmet intact. This is altered in the remakes.
* In ''VideoGame/MassEffect3'', the [[spoiler:cloned Rachni queen, assuming you killed the real queen in ''1'']] will pull this on you just to get access to your big emergency superweapon project, then sabotage the project on behalf of the Reapers. [[spoiler:The real queen, should she still be alive, is genuinely on your side though, and her brood of worker drones will provide you with more War Assets than some ''fleets''.]]

[[folder:Web Comics]]
* [[spoiler: Darth Maul]] attempts to do this in ''Webcomic/DarthsAndDroids'', pretending to betray [[spoiler: Palpatine for Nute Gunray.]] Unfortunately, [[spoiler: Gunray]] sees right through it.
* In ''Webcomic/AmericanBarbarian'', [[http://www.ambarb.com/?p=124 Rick's ploy for getting to Two Tank Omen]]
* ''Webcomic/TheLegendOfMaxx'': [[spoiler:Maxx defects to the Naiad side and joined forces with Xylan, but it's revealed to be a ploy so he can stab Xylan in the back and get the Naiad's sword.]]

[[folder:Web Original]]
* In ''Roleplay/TheGamersAlliance'', [[MagicKnight Briss]] betrays the Grand Alliance and escorts one of the heroes' enemies to Trinity Gask where he hopes to meet with BigBad [[DarkMessiah Glaurung]] [[WellIntentionedExtremist Losstarot]] and gain her trust. However, it's only an act on Briss's part because he's still secretly loyal to the heroes and see his defection as the only means to appear to genuinely join the villains and gain their trust so that he can proceed with his plan to gather intel. Things get a bit more complicated for him when he is reunited with his old fling Tiyana in the city and learns that she is working for the villains ''and'' is pregnant with his child.

[[folder:Western Animation]]
* Fluttershy becomes one in the two-part episode "The Cutie Map" in ''WesternAnimation/MyLittlePonyFriendshipIsMagic''. Despite all of [[TheUnsmile the fake smiles]] that the Equal Ponies put on, Fluttershy found them genuinely charming. It's this kindness that allowed Fluttershy and the rest of the Mane Six to convince cult leader Starlight Glimmer that Fluttershy was interested in joining them, when all Fluttershy really wanted to do was find their cutie marks. [[spoiler:This later gets exploited again by the Mane Six to expose Starlight Glimmer as a {{Hypocrite}} who doesn't follow her own philosophy.]]
* ''WesternAnimation/{{Gargoyles}}'':
** In the episode "Revelations," as an initiation into the Illuminati, Matt Bluestone leads Goliath into a trap set by Mace Malone at the Hotel Cabal, where they intend to break him mentally and then interrogate him. Matt ultimately reveals his true intentions when he saves Goliath from being outright killed by Mace. Viewers learn in the end that Goliath was in on it from the beginning. Additionally, Matt gets into the Illuminati regardless, as the only person who realized his intentions was Mace, who is left trapped in the hotel for his failure and driven insane.
** In "Protection," Elisa goes undercover as a CorruptCop to get evidence on Draco's protection racket. Out of the loop, Goliath and Broadway notice what appears to be strange behavior and are confused by what's gotten into her. However, they pick it up fast enough and even join in the deception to help bring Draco down.
* ''WesternAnimation/CodenameKidsNextDoor'':
** "Operation: M.A.U.R.I.C.E." reveals that the title character, a chicken-pox researcher kidnapped by Cree, was not really decommissioned when he turned thirteen, and instead became a DeepCoverAgent.
** Chad (Numbah 274) is revealed in "Operation T.R.E.A.T.Y." to have never actually stopped working for the KND, [[GoodIsNotNice not that it made him any less of a jerk]].
* There was one of these in ''WesternAnimation/BeastWars'', with Rattrap pretending to join the Predacons. Ironically, in the first season of the sequel series ''WesternAnimation/BeastMachines'', he actually goes over temporarily. [[spoiler: Well, sorta... Megatron was insanely vulnerable, and he made an agreement to make sure the heroes DON'T kill Megatron. Ironically, Megatron keeps his word, outfitting the weaponless Rattrap with MASSIVE weapons. It appeared he even would have let Rattrap keep them when the battle continued, except Rattrap refused the weapons. (Turns out Rattrap's a HACKER now.)]]
* Autobot Punch of ''Franchise/TransformersGeneration1''. He changes his robot mode's appearance to infiltrate the Decepticons as "Counterpunch."
* On ''WesternAnimation/ExoSquad'', Marsala does this once. Oddly, in a much later episode, the Neo Megas sorta pull one on him.
* Raimundo pulls this off on one of the {{Big Bad}}s in ''WesternAnimation/XiaolinShowdown''. His efforts were aided by the fact that he once [[FaceHeelTurn actually did it for real]].
* ''WesternAnimation/TheSimpsons'' did this one too. In the episode "A Star is Torn" has Homer acting as Lisa's agent in an ''Series/AmericanIdol''-like contest. After a fight, Homer pretends to desert Lisa and team up with [[strike:Cameron]] Johnny Rainbow. At the end of the episode, Homer is revealed to actually be [[FamilyUnfriendlyAesop sabotaging Johnny Rainbow's chances all along]].
-->'''Homer:''' He's about to learn the most important lesson in the music business: don't trust people in the music business.
* ''WesternAnimation/TinyToonAdventures'', of all shows, pulled this off with Plucky Duck. With Acme Looniversity due to play its hated rival, Perfecto Prep, in the championship game, Plucky seems to betray his Looniversity friends and begin giving Perfecto Prep inside knowledge of the Looniversity's game plan, up to and including a copy of their playbook. On game day, Plucky gives Perfecto Prep advance knowledge of the plays the Looniversity plans to use...and the Prep students suffer a humiliating defeat, with the final play not only being completely different from Plucky's signal, but with Plucky himself scoring the game-winning touchdown. In the end, it's revealed that Plucky was made into a fake defector [[ThePlan to sabotage Perfecto Prep's attempts to cheat.]]
* In the third episode of ''WesternAnimation/TaleSpin'''s pilot series, "Plunder & Lightning", [[HeartwarmingOrphan Kit Cloudkicker]] [[spoiler: pretends to betray Baloo, Molly and Rebecca in the Iron Vulture to his former mentor Don Karnage, to allow them to escape. The fake deception is so convincing and surprising that Baloo believes himself betrayed, and angrily leaves Higher For Hire with the Sea Duck to Louie's to party his cares away, until he hears Kit desperately radio for help in the fourth episode.]]
** Watching that scene, it seems that the only reason Karnage bought it was ''because'' Baloo himself bought it... he seemed fairly skeptical, then looked at the unfeigned rage on Baloo's face and ''that'''s what sold him on it.
** That and Kit actually went so far as to [[BreakTheCutie snap at Molly and make her cry]].
* Both Cyborg and Robin do this in ''WesternAnimation/TeenTitans''. Robin was less successful, as Slade has already figured out who "Red X" is.
* An episode of ''WesternAnimation/{{Cyberchase}}'' features Digit pretending to have gone bad again and being rehired by Hacker, in order to prevent Hacker from finding the secret of invincibility.
* The ''WesternAnimation/AdventuresOfTheGalaxyRangers'' episode "Renegade Rangers" was all about this trope, with the heroes pretending to go criminal in order to get to the Black Hole Gang. [=MaCross=] (second in charge) never believed it for a second, but Daisy O'Mega, a former BountyHunter who went renegade herself, is taken in by the ploy (and Shane's ChickMagnet ability).
* The titular heroes in ''WesternAnimation/{{Centurions}}'' did this in two episodes, "Max Ray... Traitor" and "Cyborg Centurion". A guest star used the same ploy in "Atlantis Adventure".
* Duke from ''WesternAnimation/TheMightyDucks'' feigned returning to a life of crime after an old member of his mob came to Earth to find out what he was stealing, and why, for Dargaunus.
* Done in an episode of ''WesternAnimation/DudleyDoRight'' so he could infiltrate Snidely Whiplash's fur-smuggling ring. The unspeakable evil act that got him thrown out of the Mounties? [[FelonyMisdemeanor Eating peas with a knife]].
* The ''GIJoe'' two-parter "The Traitor": When Cobra learns that the Joes have developed an armor treatment that makes their vehicles impervious to their weapons, the Twins approach Dusty and [[spoiler: offer to pay his mother's medical bills in exchange for the formula. At first, Dusty only gives them information on the Joes' strategy to stop their next attack, but as the expenses pile up, he eventually steals the formula and turns it over to them,]] which is followed by Duke being knocked into a coma when [[spoiler: a "trap" he and Flint set for Dusty backfires and he's trapped on an oil rig that explodes.]] Dusty is convicted at court martial and given a life sentence, but Cobra attacks as he's on his way to prison and break him out. Fully indoctrinated with the bad guys, he leads two Cobra raids on chemical plants to acquire materials for their mind control gas and even helps capture an entire squadron of Joes. When Cobra Commander gives Dusty the honor of testing the mind control gas on the captured Joes, Dusty [[spoiler: instead releases the gas into the main chamber, where it corrodes the armor-treated Cobra vehicles and {{Mooks}}, then frees the Joes and escapes.]] It turns out that [[spoiler: the Joes knew the armor treatment was unstable and ''wanted'' Cobra to get it, so Duke and Dusty came up with the plan to get the formula into their hands... but nobody else knew that Dusty's defection was all an act. (Also, the chemical combination that created the mind control gas could also be turned into a compound that neutralized the armor treatment, resulting in the hilarious scenes of both tans and uniforms completely disintegrating.)]]
* From ''WesternAnimation/YoungJustice'' [[spoiler: the truth of Kaldur's supposed FaceHeelTurn.]]
** Red Tornado was this in the first season. He seemingly defects the Justice League for his evil siblings Red Torpedo and Red Inferno but it turns out he did it in order to locate their creator T.O. Morrow
* Rogue does this is ''WesternAnimation/WolverineAndTheXMen'', but the X-Men actually don't believe her at first and lock her up when she comes to warn them about the Brotherhoods plan, until they start doing exactly what she said they would do. This is because it seemed she had done this in an earlier episode only to lure the X-Men into a trap. It's ambiguous as to whether she was pulling a fake defection all along, or legitimately joined the Brotherhood, only to later change her mind and claim she was so the X-Men would take her back.
* A later episode of ''WesternAnimation/KimPossible'' refers to this as a "Scenario 17", which Kim's Cousin Larry executed against Professor Dementor with remarkable skill and cunning, only because he believed it was a LARP session for his birthday.
* ''WesternAnimation/{{Detentionaire}}'': Lee needs an in on the Down With Lee Club, so he and Cam stage a fight so Cam can gain entrance. [[spoiler:It doesn't end up working, as [=RadCircles=] tips off the other club members about the ruse.]]
* The episode "Operation Beifong" from ''WesternAnimation/TheLegendOfKorra'' reveals that [[spoiler: Zhu Li only pretended to betray Varrick so she could get close to Kuvira and sabotage the superweapon the Earth Empire is trying to build.]]
* The 1960's ''WesternAnimation/SecretSquirrel'' series episode "Not So Idle Idol" had Secret pretend to switch sides in order to locate an idol stolen by Yellow Pinkie.
* ''WesternAnimation/NASCARRacers'': In "Duck Out of the Way", Fastex Team's chief mechanic leaves Fastex and joins Rexcor to find out how Rexton was sabotaging Fastex cars.

[[folder:Real Life]]
* Sicinnus: the private tutor of Themistocles' children took a message to King Xerxes at the Battle of Salamis advising him to attack. Whereupon the Persian fleet fell into an ambush.
* During the [[UsefulNotes/ThreeKingdomsShuWeiWu Three Kingdoms of China]], this sort of trick was sometimes pulled. In 228, for example, Zhou Fang, the commander of Wu's Poyang commandery, offered to surrender the city of Huan to the Wei general Cao Xiu. The whole thing was a plot to draw Cao Xiu out and kill him, as he'd been a major thorn to the Wu empire for years. Some of Cao Xiu's colleagues realised it was most likely a trap and tried to warn the Wei Emperor, but Cao himself realised he'd been had and tried to withdraw before falling into the trap. Wu's forces still demolished his forces and he later died of his wounds, so it was a partial success.
** One of the most famous examples happened before the Battle of Chibi, where the general Huang Gai sent letters to Cao Cao offering to defect. As Cao Cao had been receiving many such letters from various officials over the past few weeks, he had no reason to be particularly suspicious of Huang Gai. However, Huang Gai's ships pulled barges full of flammable material behind them and rammed Cao Cao's fleet, which combined with unseasonal winds sent fire raging through Cao Cao's fleet. Huang Gai himself nearly died during the course of the action, but was rescued by his old friend Han Dang.
* Eric Erickson was an American-born Swedish businessman who pretended to have converted to Nazism in order to visit Germany -- and scout German petroleum facilities for targeting by Allied bombers.
* This was actually a pretty common phenomenon during the UsefulNotes/ColdWar... in order to diminish the effectiveness of REAL defectors, the USSR sent several false defectors to flood US intelligence agencies with conflicting stories. One famous example came during the Golystin-Nosenko controversy, which ultimately led to the CIA shifting completely away from human intelligence to signals intelligence (e.g. wiretapping, satellite photos, cryptography...)
* One reason that the Germans had such poor intelligence in UsefulNotes/WorldWarTwo was that one of the finishing instructors in the spy school was actually an MI6 plant, allowing them to pick up virtually every German spy in the first few weeks.
* Contrary to popular belief, Wrestling/VinceRusso was not one, but when he left for WCW he was so bad that Wrestling/VinceMcmahon and others would ask if Russo was still on their payroll.
* In 1942, a German battalion housed in a Russian village needed to get into the rear of a Soviet unit. An [[BadassGrandpa 83 year old guy]] named [[https://en.wikipedia.org/wiki/Matvey_Kuzmin Matvey Kuzmin]] volunteered to lead them there for a good sum and a hunting gun. Before they left, Matvey sent his grandson ahead to warn the Soviets. The German commander shot him once the ambush became obvious, but the 50 dead and 20 captured men (the news reported four times that, of course) were enough to make Matvey the oldest ever Hero of the Soviet Union.