A type of reveal where misdeeds depicted in the work were in fact committed by two agents (man or beast), either separately or working together.
A less crowded version of Everybody Did It
. As this is a Plot Twist
trope, this page is Spoilered Rotten
Anime & Manga
- In the Death Note manga (and anime), it's revealed that a second death note made its way to Earth. Light eventually takes advantage of this and works with accomplices more than once.
- Rather confusingly done in The Long Halloween. When the Holiday Killer is apprehended and revealed to be Alberto Falcone, he tells the police that there was another Holiday Killer, but he refuses to elaborate. Batman interprets this as a reference to Harvey Dent aka Two-Face, who had killed Carmine Falcone on Halloween and thus (metaphorically) inherited Holiday's mantle. But in the very last scene, Harvey's wife, Gilda, monologues that she was actually the one responsible for Holiday's first victims. Whether they were telling the truth, or had simply lost touch with reality due to grief, is not entirely clear.
- After the killer Santa Claus's identity is revealed in To All a Goodnight, it is shown to the audience that there is also a second one.
- When the killer crocodile is captured in Lake Placid, another one immediately appears.
- In the first Scream (1996), it turns out that there were two killers. This was also true in Scream 2, but by then it was expected. (However, Scream 3 had only one killer. But Scream 4 returned with the duo of Ghostfaces.)
- Used in Hell Night. A bit of an odd example as the legend that surrounds the setting tells about one "deformed guy hiding in the house", and doesn't explain who the second deformed guy is.
- In the sex comedy Video Vixens, a film-within-the-film, an X-rated Dragnet parody, involves a serial rapist who is actually identical twins; one would go out raping while the other is seen in public doing something mundane as an alibi. The next night they'd switch places. (Yes, despite the description, it's a comedy.)
- A Russian joke goes: the Chinese army desperately tries to cross a mountain pass guarded by one Russian soldier. 100,000 Chinese try to storm the pass, no one returns. 200,000 Chinese try to storm the pass, no one returns. 500,000 Chinese try to storm the pass, one badly wounded soldier returns and yells: "Ambush! There are TWO of them there!"
- The Blue Paint killer in CSI: Crime Scene Investigation. The first ep has the believed killer escaping execution due to more bodies being found, then he dies at the end. In the later ep, more cases popped up, and the group realized the executed man was just the apprentice. The guy captured in that episode was the real main killer. Both men did the crimes, though.
- Psych: In season 3, Shawn captured serial killer Mr. Yang. It isn't until a year later that it was revealed that she had a partner, Mr. Yin (Mary was killed after figuring this out). A year after that, it was revealed that Yin was Yang's father, and, though they worked together, he was actually the one who committed the murders.
- In Persona 4, there are actually three. One copycat, one pawn who thought he was defeating the killer (while actually creating new victims) and then the original killer that orchestrated the whole scheme. There's also a Man Behind the Man, who had nothing to do with the killings but caused them indirectly by empowering the original killer.
- In Knights of the Old Republic, the Jedi council asks you to investigate a murder with two suspects, each accusing the other. Turns out they both did it, but not intentionally, they just happened to act on their separate plans simultaneously. Then it turns out to have been a Secret Test of Character — the Jedi master "assisting" your investigation had already solved it on his own.
- In Professor Layton and the Unwound Future a major reveal is the real identity of future Luke and his real motive.
- In Nine Hours, Nine Persons, Nine Doors, the True Ending of the game reveals that the mastermind behind the Nonary Game, Zero, is actually two of the game's participants.
- Similarly, eventually it's revealed that there are two masterminds behind Monobear, the villain of Dangan Ronpa, collectively known as Super High-School Level Despair. There's a subversion, though: the mastermind who was manually controlling the bear murdered her accomplice early in the story, by baiting her into breaking the rules. This was done to hide the fact that they had swapped identities.
- A possible theory about the truth of Rokkenjima in Umineko no Naku Koro ni is that the events are caused by two teams working independent of each other, one planning and one opportunistic. The first one is the servants and one of the siblings (which one depends on the arc) led by Yasu who plans the murders (the one among the sibling and a few of the servants think it's just a game) in order to become free from his/her fate or that Battler solves the case and finds out the truth. The other one would be Kyrie who took a chance when the gold was found and is hinted to be the main culprit.
- Phoenix Wright: Ace Attorney Has between one and four antagonists for the final case of the original trilogy depending on how you count.
- Ace Attorney Investigations: Miles Edgeworth
- A contradiction arises from initially missing this in case one.
- Kinda averted in case 5 since Yew didn't kill anyone, this time. She just helped with the body disposal.
- The sequel follows by having multiple "killers" in case one. The problem is figuring out (and proving) who did what and why. DeKiller attempted to kill the president, the killer of the bodyguard was the other bodyguard and the indicted murder only agreed to help stage a fake assassination of the president.
- xkcd has a cartoon proposing a parodic compromise with the 9/11 "truthers": One of the twin towers was destroyed by a secret US government conspiracy and made to look like an Islamic terrorist attack... and the other tower actually was destroyed by Islamic terrorists. Both attacks happened on the same day by complete coincidence.
- The Hillside Strangler turned out to be the Hillside Stranglers, Angelo Buono and his cousin Kenneth Bianchi. The police in that case had actually guessed beforehand that they might be dealing with two killers, thinking that two men would have an easier time carrying and dumping bodies around Los Angeles suburbs.