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- Fullmetal Alchemist has Envy, when he was trapped in a flask. He was able to play on May Chang's fear for her clan and talk her into going back instead of taking him to Xing, which allowed him to escape and obtain a second Philosopher's Stone.
- Homunculus did much the same while trapped in his flask, using his knowledge of alchemy and the desperation of his captor to convince the Emperor of Xerxes to prepare the alchemic circle that destroyed the nation and gave Homunculus a body.
- Soul Eater's Medusa, for the brief time she was imprisoned, did absolutely nothing for Crona or Maka's peace of mind.
- The Thing Behind the Wall in Johnny the Homicidal Maniac. Nny has to keep it trapped by keeping the wall covered in fresh blood, which naturally does wonders for his already fragile sanity. Then the Thing gives two Styrofoam dolls in Nny's apartment sentience; The Plan was that they'd persuade him to commit suicide and thus release it.
- In Dark Empire, Luke Skywalker tries a version of this on the Reborn Emperor. He does some good, but is ultimately corrupted and his sister needed to talk him around.
- John Harrison (Khan) from Star Trek Into Darkness. After being locked in the Enterprise's brig, he almost immediately starts working on Kirk, needling him psychologically, feeding him information as it suited his purposes, and eventually ending up in an Enemy Mine situation with the Enterprise crew, rather than just remaining a prisoner.
- In U571, the German submarine prisoner continuously causes problems for the American crew, until he is killed.
- In Suicide Kings, a bunch of amateurs kidnap retired mafia boss Charlie Barrett for somewhat convoluted reasons. Needless to say, Charlie turns them all against each other in record time.
- Teaching Mrs. Tingle essentially uses this as a plot framework.
- In The Dark Knight the imprisoned Joker blows up the jail and works on a cop's psyche until he breaks out.
- Ruthless People at first, till it turns into A Match Made in Stockholm.
- In the film Southern Comfort, the National Guardsmen capture a one-armed French-only speaking local Cajun hunter and trapper, one of the Cajun's who were threatening them. They attempt to talk to him but he only speaks French. Nevertheless, just his presence is enough to poison the group.
- In The Avengers (2012), Loki is captured early on. Despite the team's best preventive efforts, it ends spectacularly poorly.
- In Silence of the Lambs, Hannibal Lecter is a death row prisoner who manages to drive at least one other inmate to suicide, and whose understanding of the serial killer mind threatens to unhinge Clarice Starling.
- Following the vogue of recent movies, Silva in Skyfall gets captured as part of his plan to get revenge on M.
- In The Wheel of Time, the heroes captured no fewer than three Forsaken individually, and between them they covered just about all of the risks inherent to this trope. Asmodean was (sort of) on Rand's side, so the danger he posed was mostly just if word got out about who he really was, but you have to question the wisdom of keeping around a character like Semirhage, who was once captured by the forces of Light during the War of Power. By speech alone she terrified her guards so badly that they smuggled her out of captivity rather than face the tortures she threatened them with.
- The Silmarillion. Morgoth turns the Noldor against each other in Valinor once he was released from captivity. Later, Sauron ended up corrupting and destroying the Númenóreans after they captured him.
- In The Three Musketeers, Femme Fatale Milady de Winter pulls this by seducing her jailer when captured in England, twisting the guy so much that he becomes an assassin, attacking The Duke of Buckingham (also a Historical In-Joke, as this event really happened).
- In the Second Apocalypse series, Anasûrimbor Moënghus during the time he was a prisoner of Cnaiür urs Skiötha's tribe. He seduced Cnaiür's mother, convinced Cnaiür to kill his father, and talked Cnaiür into setting him free.
- Buffy the Vampire Slayer: In season four, Spike was often this to the Scoobies.
- Ben from Lost makes his first appearance as the captive "Henry Gale", and spends his entire time in captivity playing mind games with the survivors and attempting to turn them against one another.
- A Silurian warrior woman in series 5 of Doctor Who . She managed to convince one of the people guarding her to act on her worst impulses.
- Star Trek: The Next Generation: In Descent, a captive Borg actually succeeds in turning Data against the Federation.
- In Metal Gear Solid: Peace Walker the player can capture Zadornov and keep him in a cell in an attempt to convince him to join your cause. Ultimately, he breaks out numerous times and goes into hiding, forcing Big Boss to waste time locating and recapturing him each time. Each time he escapes, he's been released by Paz, who's using him to divert attention while she makes modifications to Metal Gear ZEKE.
- In Call of Duty: Black Ops 2, Menendez (the game's big bad) gives up quite easily when the player catches up to him about 2/3rds of the way through the game. He's taken back to the USS Obama to be interrogated. You find out why he gave up so easily during the interrogation scene when the power goes out as a result of Menendez's followers launching an attack. Menendez mysteriously gets the drop on your buddy and then escapes; you find out later that your buddy is working with Menendez and in fact leads him to the ship's central computer where Menendez uploads a virus he had smuggled in. Whoops. Also, if you're dumb enough to spare him at the end of the game, and you didn't sacrifice Harper earlier, then he breaks out again and kills Woods.
- This is why the Brotherhood is trying to control The Darkness instead of destroying it in The Darkness 2. The Brotherhood captured The Darkness and guarded it for decades. And it kept talking to them until they eventually decided that destroying the world was the only way to save it.
- At the end of Diablo, the titular Big Bad is imprisoned in a crystal which is fused with the hero's body and mind, as Diablo simply cannot be killed. Cue the second game, where the hero is completely overtaken by Diablo who wears his body like a cloak. While this counts as Demonic Possession, it is implied that the process was gradual and did not rely solely on magic, but also at least partially on the personal influence and inherent malice of the demon. The same story also happened in the past with Tal Rasha and Baal.
- The Joker on the Batman: The Animated Series episode "Mad Love", who was able to talk his psychiatrist Harlene Quinzel into becoming Harley Quinn while still in Arkham. It was implied early in the episode that he compromised the ones before her in a similar fashion. (Even scarier, the Joker had figured out how to escape from his cell weeks before he actually broke out of Arkham, but stuck around a little longer because he hadn't corrupted Harley yet.)
- Batman does this in Justice League, when captured by Lex Luthor's villainous team. He bribes Ultra Humanite to save the Justice League from Luthor's Evil Plan and take down the team from the inside, frames the perfectly innocent Cheetah as his accomplice, drives a wedge between team members and generally makes a nuisance of himself, all while restrained. Then, as the kicker, he reveals in the climax that he could have escaped at any time but stuck around 'to keep an eye on' the Injustice Gang.