->He shook his head, which only intensified the ringing in his ears. When had that started? With the shockwaves? During the fight with [[KnightInShiningArmor Chevalier]]?
->Or before all that? Before the Yàngbǎn?
->Had it ever ''stopped?''
->He thought of the [[EmotionControl Simurgh]], thought of all of this in the context of him being just one of her pawns.
->His head hung.
->Always a pawn. Always the expendable one.
-->'''Perdition''', ''Literature/{{Worm}}''

A person is {{Brainwashed}} so that, on a certain trigger (either a situation, or else a [[TriggerPhrase phrase]] only someone in the know would ever say), they will go from their normal self to TheMole; they will most often remember nothing afterward. Occasionally they can be programmed to do even more serious crimes, such as attacking their teammates outright, but their true value lies in the fact that their cover is so deep that not even ''they'' realise it.

If they or their team-mates discover the truth, expect a lot of angst. Whether or not they are are able to break free of their programming (or at least, soon enough for it to matter) will vary from story to story.

In spy and technothriller fiction, such agents are commonly known as "sleeper agents", or just "sleepers".

See also {{Brainwashed}}, BerserkButton, MoralityDial, TomatoInTheMirror, ConvenientlyUnverifiableCoverStory, AlternateIdentityAmnesia and LotusEaterMachine. Compare MemoryGambit, which is when you do this to yourself. May require {{Deprogram}}ming to cure, and if not cured sufficiently thoroughly is one of the causes of BrainwashResidue.

In Troper Addition this trope is MemoryGambit and NeuroVault meet DeepCoverAgent.
----
!!Examples:

[[foldercontrol]]

[[folder: Anime and Manga ]]
* This is how Yoh Hinomura effectively becomes ''Manga/CryingFreeman'': with the assassin doctrines of the 108 Dragons implanted in his subconscious, all it takes for him to start a mission is the same trigger phrase he heard when he was indoctrinated.
* ''LostBrain'' pulls this one.
* ''Anime/TengenToppaGurrenLagann'' has [[spoiler:Nia becoming the agent of the Anti-Spirals when the population reaches 1 million]].
* Happens in ''Manga/{{Naruto}} Shippuden'' with Sasori's spies ([[spoiler: Yuura]] and [[spoiler: Kabuto]]).
* [[spoiler: Anew Returner]] in {{Gundam 00}}. In this case, the trigger is the presence of a particular person: [[spoiler: her twin brother, Revive Revival, who gets captured midway the series and "resets" her.]]
* [[spoiler: Kirika]] from ''Anime/{{Noir}}''. She was an incredibly awesome assassin ''before.'' Fear what she became.
* ''Anime/CodeGeass'': Lelouch's mind-controlling HypnoticEyes lets him give people orders that cannot be refused, and in addition to the immediate {{Brainwashed}} victims, he can also create a ManchurianAgent by applying special condistions to the command. For example, he made a Britannian officer into a Manchurian agent that would see him as [[spoiler: Princess Cornelia (under whose command he was)]] when he grabbed his collar.
* Covered by the one-off character of Twyla in ''{{Voltron}}''.
* [[spoiler: Mitsuki, and probably the other Wolves]] in ''Manga/{{Doubt}}''
* Occurs in ''MahouSenseiNegima'' with [[spoiler: Shiori]]. In this case, it seems to simply be a decoy to keep Ala Alba from noticing something particular, but Mana [[GenreSavvy notes that they can't rule out the possibility]] of a TriggerPhrase.
* In ''TanteiGakuenQ'', [[TheSyndicate Pluto/Meiousei]] does this all the time to its clients and its own agents as a failsafe - on the trigger, they'll kill witnesses, or themselves, or go insane... and it's not pretty.
* In ''Manga/DeathNote'', [[spoiler: Light]] acts as a Manchurian Agent on behalf of [[spoiler: himself]]. One of the most ingenious plot twists in a series full of plot twists.
* ''DanceInTheVampireBund'' provides the nanotechnology known as the "Pied Piper" which when applied to vampires forces their mind to register any orders they receive as coming directly from their [[VampireMonarch overlord]] ("Release the insane werewolf and lock down your HQ so you are trapped with it? Of course My Liege").
* This is the power of one of Sinbad's Djinns in ''Manga/MagiLabyrinthOfMagic''. Zepar uses sound waves to interfer with people's minds and force Sinbad's Rukh into their bodies. [[spoiler:Princess Kougyoku is the only known one, and we witness how it happened. Sinbad confessed she is not the only one; there are two others, one in Sindria and another one somewhere else.]]
[[/folder]]

[[folder: Comic Books]]
* In ''ComicBook/AssassinsCreedTheFall'', [[spoiler:Daniel]] serves this role in [[spoiler:Warren Vidic]]'s EvilPlan to weed out the Assassin Order.
* BlueBeetle, in a memorable and bloody couple of issues of ''Comicbook/JusticeLeagueInternational''; they ultimately had to resort to a JourneyToTheCenterOfTheMind to get him deprogrammed.
* [[Comicbook/TeenTitans Titans]][=/=]ComicBook/TheFlash supporting character Frances Kane was originally programmed this way by her ''therapist'', probably contributing to her [[SuperpoweredEvilSide later mental problems]].
* In the comic book ''ComicBook/OneHundredBullets'', the phrase (used to cause old memories to re-emerge rather than force them to do something against their will) is "Croatoa."
* Subverted in an issue of ''ComicBook/JusticeLeague Adventures'', where this is attempted against the subject's will, but whoever it was made the mistake of choosing ''TheQuestion'' as their mole. He's so paranoid, he actually ''found himself out'' before he could do any damage.
* These turn out to be central to the plot of ''Hondo-City Justice'' - a large number of girls with alien DNA are triggered to kill the drokk out of any {{Yakuza}} members they happen to see. Asahara manages to overcome it.
* In the conclusion of the ''Comicbook/{{Daredevil}}'' "ComicBook/{{Shadowland}}" event, [[spoiler: Typhoid Mary]] was revealed to be Kingpin's Manchurian Agent.
* Inverted in the {{Marvel}} ''[[ComicBook/TheTransformers Transformers]]'' comics when Ratchet, forced by Megatron to rebuild [[TheStarscream Starscream]] as a Pretender, hides Starscream's true personality deep in his neural circuits. Megatron then sends the "new" Starscream against the Autobots and Decepticons on Earth. One shot from Hot Rod damages Starscream, and he ''immediately'' reverts to the DirtyCoward we all know and love.
* IDW's [[ComicBook/TheTransformersMegaseries Transformers comics]] has Nightbeat, who was reprogrammed by the inhabitants of the Dead Universe to kill Optimus Prime when the time was right. Nightbeat being [[SpottingTheThread Nightbeat]], he realises somthing's up, and has Hardhead accompany him when he goes investigating the planet he was captured on, so that if he turns Hardhead can kill him. He does, and Hardhead does as well. [[ComicBookDeath He gets better]], but the programming lingers until ComicBook/TransformersDarkCybertron, when Rodimus finally breaks him out of it.
** There's also Beachcomber, who was implanted with a cerebro-shell and sent to assassinate Blaster when the time was right. He almost succeeded. Blaster eventually recovers and finds out, and encourages Beachcomber to fight what's been done to him. It nearly kills the poor guy.
[[/folder]]

[[folder:Fanfiction]]
* [[http://www.fanfiction.net/s/5971984/1/The-River This]] Season 3 ''Series/BuffyTheVampireSlayer'' fic where Faith turned out to be a ManchurianAgent placed by Wes to infiltrate the Mayor’s organization and with a simple phrase, wake up and come back to fight with the white hats. But then there’s the big reveal in the finale, [[spoiler:the real Faith was the evil one from the start, Wes having made up the alternate Faith to give her a chance at redemption]].
* ''Fanfic/{{Pokeumans}}'': Theoretically, everyone (including ''you'') is one of these - the trigger is seeing a transforming Pokeuman, and afterwards everyone's memory of the incident is erased.
* [[spoiler:Gadget]] has become one in ''Fanfic/OfMiceAndMayhem''. She has a chip inside her head that automatically makes her kill a leader at 9 a.m. unless she is sedated. To make matters even worse for her, she has already poisoned a [[{{Qurac}} Middle East]] dictator to death in a test run which means that a human has been assassinated by [[spoiler:a Rescue Ranger]].
[[/folder]]

[[folder:Film]]
* The near-eponymous (technically speaking, the Manchurian Agent isn't the "Manchurian Candidate", but that's nitpicking) ''Film/TheManchurianCandidate'' (TheFilmOfTheBook). There are currently two adaptations, the 1962 adaptation and the 2004 adaptation.
* Arguably, the entire population of ''Film/TheMatrix'', being as how anyone who hasn't been freed from the Matrix can become an Agent at any time. It's arguable because, while the result is the same, from the perspective of anyone inside the Matrix they physically turn into an Agent.
* In the movie ''{{Zoolander}}'', the title character is hypnotized into becoming a berserk assassin when he hears the song "Relax" by Music/FrankieGoesToHollywood. As is ''every'' [[TheConspiracy major assassin in US history.]] Maybe not to that particular song, but the brainwashing thing.
* More or less the entire point of the movie ''Film/CurseOfTheJadeScorpion''. One of the key words was "Madagascar". Bonus points in that one of the people thus hypnotized was the detective in charge of his own investigation, and doesn't realize it.
* ''Telefon'' (1977). The KGB plant 51 such agents with fake identities in the United States, programmed to commit acts of sabotage on receiving a TriggerPhrase. Unfortunately a fanatical Stalinist opposed to détente steals the list of agents, and the Soviets have to send Charles Bronson to stop him.
* [[spoiler:Morgan Sullivan]] was his own Manchurian Agent in the movie ''Film/{{Cypher}}''.
* [[spoiler:Reggie Jackson]] was one in ''Film/TheNakedGun''.
* ''Film/GoingBerserk'' - John Candy's character is brainwashed by a cult to assassinate his fiancée's congressman father using a playing card as a trigger. Something goes wrong in the hypnotism though, and the trigger doesn't make him a cold-blooded assassin as much as a loud obnoxious asshole - HilarityEnsues.
* The second ''Film/JohnnyEnglish'' film has the bad guys use a compound to turn anyone into a hidden assassin before dying from a heart attack.
* {{Film/Salt}} Has a group of these trained from childhood.
** Technically, they are {{Deep Cover Operative}}s. They are not made to forget their origins but to blend into the American culture.
* The [[Film/UniversalSoldier UniSol]] [[CloneArmy clones]] in ''Day of Reckoning''.
* The Clone Troopers from ''Star Wars'' are an ''army'' of Manchurian Agents. Palpantine had a series of genetic "orders" implanted in them that he could activate when ready. Until than the Clone Troopers simply acted as normal, friendly soldiers. The only order we see is [[ThePurge Order 66]], which when said caused every single Clone Trooper who heard it to instantly consider any Jedi a traitor to the Republic and attack them. He also had plenty of failsafes to keep them loyal to him and him only.
** The Expanded Universe showed that some of the Clone Troopers were strong enough to resist Order 66 and that those who didn't hear it remained good (one Clone Trooper who was stuck on an uncharted world during the end of the Clone Wars later joined up with the Rebellion), but the vast majority of them succumbed to it and those who didn't were either forced into hiding or killed.
%% * ''Film/X2XMenUnited''. In conjunction with BrainwashedAndCrazy.
[[/folder]]

[[folder:Literature]]
* In the fourth ''ASeriesOfUnfortunateEvents'' book, [[spoiler:Klaus is repeatedly taken in and out of a brainwashed state, which is triggered by the word "lucky" and ended by the word "inordinate."]]
* In David Wingrove's ''Literature/ChungKuo'', a servant is made to attack General Tolonen.
* Richard Condon's ''Film/TheManchurianCandidate''. The TropeNamer.
* In Frank Herbert's ''{{Dune}}'', the Bene Gesserit can use psychosexual conditioning techniques (called hypno-ligation) to control people. They can trigger their victims by using code words.
** The ghola Hayt has a trigger word that is intended to trigger an assassination. His ability to resist it becomes something of a plot point.
* DeanKoontz' ''Night Chills'' has an entire town of sleepers triggered by the phrase "[[TriggerPhrase I am the key]]".
** In ''Literature/FalseMemory'', victims are programmed with two-step triggers: the name of a novel character, followed by a haiku. If the haiku is not recited for several seconds, the victim will become conscious again, with no memory of hearing the trigger or what they were doing immediately before. They will only respond to commands or statements; if asked a question (unless it is phrased as a command, i.e. "Tell me if you understand"), they will merely repeat it back.
* In the ''Franchise/StarWarsExpandedUniverse'', one of the [[Literature/XWingSeries X-Wing books]] used this. The trigger phrase, different for each agent, was a nonsensical problem (for example, "Those Wookiees are dancing in the parlor again") that instantly became the sole focus of the brainwashed person's life - and the only way to "solve the problem" was to carry out the preprogrammed mission, usually an assassination.
** An earlier ''X-Wing'' book had a version not triggered by a code phrase, caused by long-term torture and reconditioning in the Lusankya prison. These agents would be unaware of what Isard had done until they were triggered, at which point they became [[ApologeticAttacker Apologetic Adversaries]]. The example above was considered more dangerous because it could be engineered by only a day's worth of chemical treatments after kidnapping the target, and it also managed to stir up FantasticRacism by, for example, causing a fleetwide suspension on Twi'lek pilots.
* ''Film/TheIpcressFile''.
* Imriel in ''[[Literature/KushielsLegacy Kushiel's Mercy]]'': the trigger is kissing his beloved.
* Creator/LordByron was ''almost'' used as one of these in Creator/TimPowers' ''Literature/TheAnubisGates''.
* Inverted in the Literature/LordDarcy story ''A Case Of Identity'', where [[spoiler:Lord Seiger]] is a homicidal maniac when in his ''natural'' state, but has been constrained by mental healers' geas effects to be entirely harmless and trustworthy. [[spoiler: At least, until he's fed the correct trigger phrase by his superior in the Angevin royal spy organization, which unleashes his full AxCrazy lethality on enemies of the Crown.]]
* ''{{The Glass Books of the Dream Eaters}}'' features a trigger phrase known only to the highest echelon of the Cabal, used on those who have undergone the Process, that makes them [[spoiler:follow the instructions given by the person who uses the phrase to the letter.]] It varies based on several factors; it includes a colour ("blue" for those who underwent the Process at the Institute, "orange" for those who underwent it at Harschmort,) a Biblical reference ("Magdalene" for the recruited followers, "Caesar" for the officers, etc.,) the place they were recruited ("Royale" for the Hotel Royale, "Regiment" for the army,) and the words "ice consumption." So, for example, the Countess uses "orange Magdalene orange Royale ice consumption" on [[spoiler:Miss Temple, when trying to determine whether or not she underwent the Process at Harschmort.]]
* In the ''CaptainUnderpants'' books, Mr. Krupp turns into Captain Underpants when he hears fingers snapping, and returns to normal when water is poured on his head.
* Programming people is routine for protagonist's agency in Creator/OlegDivov's ''Brothers in Reason''. [[spoiler:The main character himself]] as well as [[spoiler:his half-brother]] are programmed to shoot [[spoiler:their father]] on sight, one with a gun and the other with a laser implanted in the forearm. The first one is revealed when he begins to suspect something and asks his half-brother to hypnotize him. When he becomes aware of the programming, he is now free to disobey it.
** It is standard policy for all agency employees to undergo brainwashing whenever a [[TheMole mole]] is suspected.
** This is the same agency that psychically zombifies the entire population of Earth into loving everything Russian, the ultimate psychotronic weapon.
* In the TabletopGame/{{Shadowrun}} novel ''Night's Pawn'', a MegaCorp executive's daughter is programmed to kill her father as soon as they're alone together. Worse, she's programmed to do so with a concealed bone spur that can't be detected on scans ... and that's designed to slit her own arteries as it emerges, causing her to bleed to death and thus be unable to explain what happened to her.
* In ''Literature/TheDresdenFiles'' novel ''Turn Coat'', there are abounding fears within the White Council of Wizards that there are traitors running amok after one of the Senior Council is murdered. It turns out that someone has been mucking with the heads of [[spoiler: the entire younger generation of wizards, turning them into sleeping assassins/suicide bombers, including Captain Luccio, the head of the Wardens.]] On top of that, [[spoiler: all of the other wizards have been quietly influenced by subtle mind-control enchantments over the course of the war.]]
* In ''Literature/TheStand'', Tom Cullen is hypnotized and programmed to be a spy for the Boulder faction. The full moon is his trigger for returning to report his observations. [[{{Catchphrase}} M-O-O-N, that spells moon]].
* Raul Diaz in ''Literature/MrBlank'' is referred to as a Manchurian Candidate. Brainwashed by so many different conspiracies, traded as a pawn, he even [[spoiler: gets activated to kill by accident.]]

[[/folder]]

[[folder: Live Action Television ]]
* Several episodes of ''Series/TheWildWildWest''.
* ''Series/{{Firefly}}'''s River Tam, although it's only really seen in TheMovie, ''Film/{{Serenity}}''. Her trigger was a subliminal message buried in a Fruity Oaty Bars commercial, which caused her to go into [[WaifFu martial-arts-killing-machine]] mode.
* [[spoiler: Talia Winters]] in ''Series/BabylonFive'', [[spoiler:and Garibaldi]] in season 4.
* Spike in season seven of ''Series/BuffyTheVampireSlayer''. The trigger is "Early One Morning," a song his mother used to sing when he was a child.
* The Romulans do this to [=LaForge=] in the ''Series/StarTrekTheNextGeneration'' episode "The Mind's Eye".
** In the ''Series/StarTrekDeepSpaceNine'' episode "Inquisition", Bashir is accused of being a ''willing'' one of these (as in, he agreed to become an enemy agent and then suppressed any knowledge of it in order to maintain his cover perfectly) [[spoiler: by Section 31. He's not, it's all just a test by the SecretPolice to screen him for initiation into their organization whether he likes it or not.]]
* ''StarTrekEnterprise''. In the MirrorUniverse, Mirror Tucker is tortured for hours after a suspicious overload shuts off the ship's cloaking device and internal sensors. Afterwards he accuses Mirror T'Pol of doing the deed and framing him for it.
-->'''T'Pol:''' You're mistaken.
-->'''Tucker:''' The hell I am! I think I'd remember if I had sabotaged the ship!
-->'''T'Pol:''' Not necessarily.
-->'''Tucker:''' [{{beat}}] What did you do to me?
-->'''T'Pol:''' I lured you away from Engineering with the promise of a sexual encounter. Once we were alone in my quarters, I implanted a telepathic suggestion. I compelled you to sabotage the power grid. After you completed the assignment, we melded again. I altered your memory of what had happened.
* This is the setup for ''Series/MyOwnWorstEnemy'', which features one.
** This is an inversion, though, as Edward Albright, the spy, is the original personality, and Henry Spivey, a quiet middle-management office employee with a wife and two kids, is the implanted cover.
** The whole premise of the show is the breakdown of the chip that separates the two lives and Henry becoming aware of his alter-ego. Cue the inexperienced Henry going on missions, and Edward sleeping with Henry's wife.
* A couple episodes of ''Series/StargateSG1'' use this. [[spoiler: The agents trigger to a particular event or time after being brainwashed to do so, kill the target(s) and then themselves.]]
* A ''Tekwar'' episode had an agent undergo this to infiltrate a criminal organization, which screens entries using a lie detector. The criminals somehow catch on and interfere with the switch, causing a personality crisis - resolved by the main character preparing to make the coup de grace.
* This was a favourite tactic of the aliens in the 1970s British sci-fi series ''{{UFO}}''.
** In "Kill Straker!" The aliens give Paul Foster a subliminal command to kill Commander Straker.
** In "The Man Who Came Back", Commander Straker's friend Collins turns out to have been brainwashed by the aliens into an assassin. His orders: kill Straker.
* Done twice in the ''Series/MacGyver'' episode "Brainwashed." Jack Dalton and Pete Thornton are both programmed with different code phrases buried in the speech to be given by the president of a fictional African country they're programmed to assassinate. The simultaneous missing weekend over which they were programmed is covered by FakeMemories.
* In ''Series/BigWolfOnCampus'', the Evil Werewolf Syndicate try to increase their numbers by doing this to Tommy; whenever he hears the code phrase he's supposed to bite the nearest person.
* The alien "sleeper agents" on ''Series/{{Torchwood}}''.
** Also in the episode "They Keep Killing Suzie", where a certain someone [[spoiler: Suzie]] encodes multiple triggers into a hapless man she met at a philosophical group [[spoiler:in order to get herself brought back from the dead and take over Torchwood]].
* [[spoiler:Mellie and Perrin]] in ''Series/{{Dollhouse}}''.
--> '''Adelle [=DeWitt=]''': There are three flowers in a vase. The third flower is green.
** It's not perfect, though. If someone realizes they're being triggered, they may resist, to an extent. Specifically, [[spoiler:Mellie resists when ordered to kill Paul, and opts to shoot herself instead]].
* The episode "Attack Angels" of ''Series/CharliesAngels'' features a villain who runs a business creating examples of this trope and selling their services to other villains.
* [[spoiler: Sharon "Boomer" Valerii]] from the 2000s ''Series/{{Battlestar Galactica|Reimagined}}''.
* Rocko from ''Series/PuppetsWhoKill'' was brainwashed into becoming an assassin for the government in one episode. The trigger to switch him between normal and brainwashed was to show him a Jack of Diamonds. Naturally, this led to a whole bunch of stuff happening that made the two scientists stop and note that they shouldn't have used something as common as playing cards for the trigger.
* ''Series/GetSmart'' - Max is abducted and brainwashed to assassinate the Chief over their usual chess game at the club - an employee is the KAOS agent behind the scheme and knows the Chief always wins, so he makes "Checkmate" the trigger. It's ''Get Smart''-- ''of course'' it doesn't work as planned.
** And the funny part at the end after the villain is defeated, Max is ''still'' reflexively shooting at anyone saying "Checkmate" and sheepishly explaining that a bad habit is hard to break.
* Creator/DerrenBrown's special "The Heist" was a real-life attempt at creating four of these.
** In case you're wondering... [[spoiler: [[ParanoiaFuel 75% success rate.]]]]
** In his ''The Events'' special, he picks a susceptible person in a cafe and then programs the guy to steal a TV when he sees a girl wearing red and holding a balloon. The guy does and then tries to come up with a lame excuse for his behavior when caught.
** He goes even ''further'' in the special "The Assassin". He picks a susceptible person from his audience and then spends some time programming him to respond to the polka dot pattern (which puts him into a susceptible trance after which he doesn't remember anything) and a specific ringtone (that causes him to think he's still at the shooting range firing at a target). The only other thing that is required is someone to tell him who the target is. In this case, it's StephenFry. [[spoiler:The guy successfully "assassinates" the actor in the middle of a crowded theater; luckily, Derren is there to clear things up and remove the conditioning]]. Derren keeps referring back to the assassination of Bobby Kennedy, whose killer Sirhan Sirhan has been claiming for decades that he's been programmed by the CIA.
* The ''Series/MissionImpossible'' episode "Mindbend", where brainwashing is used. They have a drug prepared to counter it...
** The second series episode "The Assassin", with hypnosis and biochips behind the ear.
* The ''Series/{{Vegas}}'' episode "Lost Monday" has Binzer being hypnotized into constructing and detonating a bomb. The hypnotist instructs him to respond to the trigger word "superstar".
* In the ''Series/{{Farscape}}'' episode "A Prefect Murder", Aeryn is turned into one via a mind-controlling bug. There's also a subversion: after being bitten. John pieces together what's happening just in time to hand over his weapon and leave the area.
* An episode of ''TheOuterLimits'' deals with a prep school which is a front for an agency training these. It is revealed at the end that their "recruits" have infiltrated many agencies, including law enforcement. Programming is done with an implanted computer chip, although it fails with someone who has ulcers due to a treatment formerly prescribed for it.
* In the (original) TV series of ''Series/{{V}}'', Ham Tyler is brainwashed to kill resistance leader Michael Donovan.
* In one episode of ''Series/InSecurity'', N'udu is brainwashed and assigned to kill his best friend.
* ''Series/DoctorWho'':
** One Dalek scheme involved sending Daleks to WorldWarII-era Britain to serve in the army. Their memories were altered so that they'd think they were actually British war machines. When the Doctor saw Daleks employed by Britain, he panicked and attacked them, declaring, "I am the Doctor and you are the Daleks!" This made the Daleks revert into the {{Omnicidal Maniac}}s we all know and love. At the same time, it confirmed that they actually were Daleks, allowing them access to a machine with which they could repopulate the Dalek species.
** The Auton Romans in "[[Recap/DoctorWhoS31E12ThePandoricaOpens The Pandorica Opens]]", [[spoiler:including Rory]].
** The ''entire human race''. The Silence's ability to control humanity via post-hypnotic suggestion ends up accidentally backfiring in the most spectacular way possible when one of them is recorded accidentally uttering the following words, which is then broadcast to the whole planet during the Moon-landing.
--> '''Silence''': You should ''kill us all on sight''.
* ''Series/MagnumPI'': During their service in Vietnam, Magnum and T.C. were captured by the Viet Cong. One episode revealed that a KGB officer had turned [[spoiler:T.C.]] into one of these. [[spoiler:They activated him in order to assassinate some Japanese dignitaries, but Magnum was able to stop the plot and T.C. was sent to a hospital for deprogramming.]]
* In a first-season episode of ''Series/LoisAndClark'' a magician hypnotizes people into becoming his willing slaves when they hear the phrase "moon and stars", with both Superman and Lois falling victim to this.
* ''Series/{{Supernatural}}'': Castiel spends most of Season 8 being controlled by Naomi, the head of Heaven's black ops division, only remembering this fact when called back to Heaven to report to her. [[spoiler: When the retrieves the Word of God tablet, however, its energy breaks her control.]]
* In ''PowerRangersRPM'', while [[spoiler:Dillon]] is the most obvious, [[spoiler:a ''significant percentage'' of the population of Corinth have been turned into cyborgs without their knowledge, to turn on the rest of the population when Venjix triggers the command.]]
* ''Series/TheNewAdventuresOfRobinHood'': In "The Hanged Man", the Sheriff uses a MadScientist to brainwash either Marion, Little John, or Tuck to kill Robin.
[[/folder]]

[[folder:Tabletop Games]]
* A number of social Charms in ''{{Exalted}}'' do this. The standout would be the Subsidiary Personality Implant expansion of Mind-Ripping Probe, which explicitly mentions setting a trigger condition for the hidden self to come out to play.
* The OldWorldOfDarkness allows plenty of this. VampireTheMasquerade and MageTheAscension give players access to Dominate and the Mind sphere, respectively, while World Of Darkness: Sorcerer provides [[PsychicPowers Psychic]] (and Hedge Magic and Technomagic) Hypnosis. All of those can be used to create a Manchurian Agent with deep programming. Project Twilight - a sourcebook for anti-supernatural government agents - even makes "Manchurian Candidate" a flaw that can be taken by players.
[[/folder]]

[[folder: Video Games ]]
* In ''VideoGame/{{BioShock|1}}'', [[spoiler: the main character would obey any command he heard that was accompanied by the phrase "would you kindly."]] Slightly different than most, in that it didn't put him into any kind of trance, it just made him decide that's what must be done. The details on how exactly it works are somewhat lost, as [[spoiler:the main character is a silent protagonist. And since the commands are all immediately handed to ''you'' as mission objectives, you really don't have much choice in the matter.]]
* Kilrathi defector "[[ShoutOut Hobbes]]" was revealed as one of these in ''VideoGame/WingCommander 3: Heart of the Tiger'', with the trigger phrase... "[[TitleDrop Heart of the Tiger]]".
* [[spoiler:Luke]] in ''VideoGame/TalesOfTheAbyss'', who was programmed to [[spoiler:unleash a [[WeaponOfMassDestruction hyperresonnance]]]] when he heard the trigger phrase.
* [[spoiler: Boyd, aka "The Milkman"]] in ''VideoGame/{{Psychonauts}}'' apparently had some sort of subliminal trigger implanted in his already fragmented mind by the BigBad. When [[spoiler: Raz accidentally]] released that trigger while exploring his mind, he followed those implanted orders to destroy the asylum and cover up anything that went on there. [[spoiler: However, it takes him quite a long time to finally do it, because the final passcode hadn't been given. Fred says it completely by coincidence as he leaves the asylum.]]
* [[spoiler: Alex Mason]] in ''VideoGame/CallOfDutyBlackOps'' is programmed to [[spoiler: kill President Kennedy]]. It's not outright stated whether this succeeded or not, but it's heavily implied.
-->[[spoiler:'''Mason:''' You tried to make me kill my own President!]]\\
[[spoiler:'''Dragovitch:''' ''(laughs) Tried?'']]
** It's also revealed that [[spoiler:Viktor Reznov managed to add onto that programming, sending him after the men responsible for the initial brainwashing.]] This bit comes up again in ''VideoGame/CallOfDutyBlackOps2'', where [[spoiler:one of Reznov's targets, Kravchenko, is revealed to have survived - when he shows up, one of the plot-changing decisions you get to make is whether to resist the brainwashing and let him talk, or give in and shoot him.]]
* In an overheard conversation in ''VideoGame/AssassinsCreedRevelations'', the [[TheKnightsTemplar Templars]] have in the past used brainwashed spies against the Assassins. Shaun Hastings suspects that [[spoiler: Desmond may be one after he killed Lucy while under the control of a Piece of Eden]], but there are hints that [[spoiler: Lucy herself could have been one.]]
** ''VideoGame/AssassinsCreedIII'' reveals that [[spoiler:Lucy was a willing traitor]] while [[spoiler:Daniel Cross was turned into this trope by the Animus]].
* A variation is featured in Chapter 2 of the Imperial Agent storyline in ''VideoGame/StarWarsTheOldRepublic''. [[spoiler:The Agent is programmed to carry out certain orders given after the command word is used and, while they still control their own thoughts and remember their actions, they are unable to disobey. The Agent doesn't realise they have undergone the procedure until the leader of the SIS cell they're infiltrating [[OhCrap forces them to obey him]] . The Agent also starts [[DisneyAcidSequence going insane]] as a side-effect.]]
** The other use of this in-game is the Children of the Emperor, crossing both the Consular and Knight arcs. Force-Sentitive infants and children throughout the galaxy are found by the Emperor's agents and brought to him. The Emperor then uses a Sith ritual to establish a PsychicLink with them, seeding them across the galaxy. At any time, he can activate that link and use them as vessels for his will and consciousness. The "children" are not usually aware of their status until the emperor has need of them, so they live ordinary lives, many as loyal Republic citizens, until the trigger causes them to betray their former friends and allies while exhibiting the usual [[DrunkOnTheDarkSide Sith degree of sanity]]. With the Knight, [[spoiler: Kira Carsen's parents surrendered her willingly,]] and the Emperor possesses her to try and kill the [[TheChosenOne Knight]] in Act One, when they're [[DangerouslyGenreSavvy still too weak to face him directly]]. Consulars will have their hands full with the rest of the "siblings," who range from diplomats and low-ranking Sith, to common Republic soldiers and even [[spoiler: Master Syo Bakarn, a senior member of the Jedi Council]]!
* In ''VideoGame/LegendOfHeroesTrailsInTheSky'', the [[spoiler: Male protagonist, Joshua Bright]] is revealed to be a Manchurian agent for [[spoiler: The Ouroboros]], giving [[spoiler: Cassius Bright's]] information to them while everyone else are asleep.
[[/folder]]

[[folder: Visual Novel]]
* In ''FateStayNight'', asking [[spoiler:Issei too much about Caster will trigger a bad end.]]
[[/folder]]


[[folder:Webcomics]]
* Oasis from ''Webcomic/SluggyFreelance'', when she sees Hereti-Corp's logo "Override B-1" is activated and she murders every H-C employee in sight.
* Unlike the common zombie-like revenants in ''Webcomic/GirlGenius'', the revenants from Sturmhalten appear exactly like normal people (well, as normal as anyone in a Creator/PhilFoglio comic) until their controller issues them orders, which they carry out against their will. Interestingly, some are capable of freedom within those constraints. (Such as killing a friend so he won't suffer a Fate Worse than Death.)
** Recently, [[DefectorFromDecadence Tarvek]] stated that the zombie revenants are actually only, "A statistical extreme," and that the sleeper agent revenants are actually far more common. It's just that, since the zombie revenants are far more obvious, they managed to divert attention from the real things.
* Gabriel (of ''PennyArcade'' fame) is responsible for the murder of the president of the U.S.A in one comic after presumably having the instruction planted in him after going to a psychotherapist (or something).
* [[spoiler:Mace Windu]] in ''DarthsAndDroids''.
* ''Webcomic/TheOrderOfTheStick'': The Monster in the Darkness has [[spoiler:"eat Redcloak (and spit out his [[SoulJar holy symbol]])" linked to the trigger "Redcloak betrays Xykon".]]
* Emily the SixthRangerTraitor from ''Webcomic/OurLittleAdventure'' [[spoiler: shed her [[MeatPuppet human shell]] and turned into a HumanoidAbomination under Angelo's command when she touched the first Magicant Piece.]]
[[/folder]]

[[folder:Web Original]]
* In the WhateleyUniverse, Team Kimba have worked out that Solange has created a Manchurian Agent among their friends. They ''still'' don't know who it is, but they're sure the agent has planted a blackmail note for Solange, and put a tracker in Fey's luggage.
* In ''Literature/{{Worm}}'', the [[OmnicidalManiac Simurgh]] ''mass produces'' these. As a powerful telepath, she gets into the minds of those she encounters and twists them until they will fulfill her needs. These agents can go undetected for years, acting perfectly normal until they get into position to influence something important, at which point they appear to snap. The Simurgh's impressive precognitive powers only makes this ''more'' effective.
[[/folder]]

[[folder: Western Animation ]]
* Haley in an episode of ''WesternAnimation/AmericanDad''. The trigger phrase? "I'm getting fed up with this orgasm!"
** Another episode had Steve react to a trigger that compelled him to assassinate a certain government official, as a throwaway gag.
* Using this, Sideshow Bob turned [[spoiler: Bart Simpson]] into a LaserGuidedTykeBomb in one episode of ''WesternAnimation/TheSimpsons''.
-->'''[[spoiler:Bart]]''': [[CreepyMonotone Time to blow up the clown]].
-->'''Homer''': Go. Blow.
* ''WesternAnimation/InspectorGadget'' did this once, with a game show that hypnotized its contestants (including the titular character) into reacting to the phrase "Going my way?" Turns out it did make him go their way...
* The brainwashing done by Dai Li in ''WesternAnimation/AvatarTheLastAirbender'' is activated by saying "(name), the Earth King has invited you to Lake Laogai." to which they respond by gaining MindControlEyes and saying "I am honored to accept his invitation."
* ''WesternAnimation/TheAdventuresOfJimmyNeutron'' in ''My Big Fat Spy Wedding'', where Jet Fusion is hypnotized to kill anyone who says "I have the Ring". The catch? Jimmy is the Best Man in the wedding of Jet Fusion and Beautiful Gorgeous. [[spoiler:Sheen and Carl discovers the trick, crash into the wedding to tell Jimmy, Jimmy then orders everybody in the church to say "I have the Ring" and Libby makes up a song which its lyrics are "I have the Ring, yes I have the Ring, I have the Ring right here". Cue to a whole musical number which included DNA Production's Founders Keith Alcorn and John A. Davis dancing in the Church]] CrowningMomentOfFunny? I think so.
* Mayor Adam West of ''WesternAnimation/FamilyGuy'' is a deep cover agent who is activated by the phrase "Boy, that Italian family in the next table sure is quiet." Also, [[spoiler: Meg is revealed to be a deep cover agent as well.]]
** Bonus points for doing this to a character whose [[spoiler:voice actress is fluent in Russian]].
* Luna Fatale in the animated series of ''ComicBook/SpirouAndFantasio''.
* Often discussed in ''WesternAnimation/YoungJustice''. Since Superboy is a clone from Cadmus, many were fearful that he's secretly programmed to spy and/or turn on the Justice League and their affiliates. [[spoiler: Superboy is confirmed not to be one. Same episode reveals Red Arrow is a sleeper agent.]]
* In the lost episodes of ''WesternAnimation/StarWarsTheCloneWars'', [[spoiler:the Clone Troopers]] are revealed to be this. [[spoiler:Seeing how we've discovered that their obedience conditioning doesn't make them mindless and have spent the entire series with them arguing that ClonesArePeopleToo, the chip in their head that enforces total obedience is probably the only way to explain how they all turned on the Jedi in Order 66]].
[[/folder]]

[[folder: Real Life ]]
* This was one of many forms of mind control researched by the CIA's Project MKULTRA and, out of all the things they tried, seems to have been the ''least'' workable (and for one of America's many insane ColdWar super-science pipe dreams is ''really'' saying something). At least that's the official story...
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