[[quoteright:350:[[Film/Terminator2JudgmentDay http://static.tvtropes.org/pmwiki/pub/images/t2guardtwins_3336.jpg]]]]
[[caption-width-right:350:Watch out, Don Stanton. Your identical twin brother is about to kill you in five seconds.[[note]]On the left is Don Stanton as Lewis, the hospital security guard. In the background is twin Dan Stanton playing the T-1000 mimicking Don.[[/note]]]]

If you want to pull out some kind of {{doppelganger}} in an episode of TV, the ideal way to achieve it would of course be to bring in a whole other actor who just happens to look exactly like the actor you're duplicating. Unfortunately, actors generally don't have identical twins hanging around.

But hey, sometimes they do! Twins have a certain advantage when it comes to getting in movies and TV. For one, child labor laws limit the amount of filming a kid can do in a single day. When you've used one kid to the daily quota, there's always the backup kid. For another, identical twins make excellent doubles, which works even if the twin isn't an actor.

Not to be confused with BackupTwin. And the title is not referring to [[TwinThreesomeFantasy inciting a three way between twins]]. Come on, guys.
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!!Examples:

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[[folder:Film]]

* ''Film/Terminator2JudgmentDay'':
** There is a shot where Sarah Connor appears on screen at the same time as the T-1000 is mimicking her. This shot was achieved using Linda Hamilton's twin sister Leslie Hamilton Gearren as the T-1000. Apparently the filmmakers were not aware until production commenced that Hamilton had a twin because the original plans were to use more complex camera tricks and film editing.
** Gearren is also used in a DeletedScene that appears to show Schwarzenegger in a mirror while Hamilton is working on the inside of his head; this was actually a clever set piece done entirely without camera effects through the use of an empty mirror frame, the Hamilton twins, and a Schwarzenegger dummy with an open robotic skull. [[note]]That, or there is something the voters of California need to know.[[/note]] They also use Leslie in Sarah's dream sequence.
** As pictured above, the twin brothers Don and Dan Stanton allow one to play a mental hospital security guard and the other playing the T-1000 in his form to appear onscreen at the same time.
* Don and Dan Stanton also played two scientist twins in ''Film/Gremlins2TheNewBatch'', and had a minor part (a cameo, basically) in ''Film/GoodMorningVietnam''.
* ''Film/{{X-Men}}'': Amusingly enough averted in the first movie. Mystique impersonates Bobby "Iceman" Drake (ShawnAshmore), and in one scene, the real Iceman walks by a door shortly before the fake Iceman comes out of it. The director states in the commentary that he didn't know he'd managed to hire somebody with an identical twin who could easily have played the double and went to the bother of doing two takes spliced together. They did make use of twins in the sequel though, when Mystique walked past the janitor while doing some undercover work.
* Funnily enough, Aaron Ashmore (Jimmy Olsen) had the part of BOTH twins in a movie called ''Film/MyBrothersKeeper'', while they used Shawn for stuntwork.
* PenelopeCruz's younger sister Mónica (who looks exactly like her) was used as her double in ''Film/PiratesOfTheCaribbean: On Stranger Tides'' to [[HideYourPregnancy hide the fact that Penelope was pregnant]].
* ''Seventeen Again'': The entire plot is that the grandmother is [[FountainOfYouth rascalized]]... and becomes the [[IdenticalGrandson spitting image of her granddaughter]], played by Tia Mowry. The rascalized grandma, naturally, is then played by Tamera Mowry, Tia's twin sister. (And just for kicks, the granddaughter's younger brother is played by...the twins' younger brother Tahj.)
[[/folder]]

[[folder: Live Action TV ]]
* ''Series/BuffyTheVampireSlayer''
** In "The Replacement", Xander is split into the strongest and weakest elements of his personality. Nicholas Brendon's twin Kelly Donovan guest starred -- but was only included when they had to be in the same shot together, due to the fact that Kelly Donovan isn't (primarily) an actor.
** Also, Nicholas Brendan was so sick in "Intervention" that Kelly played Xander for his fight scene. He went on to be Nicholas's stand-in throughout the rest of the series.
* ''Series/{{Charmed}}'': Young Wyatt Halliwell was played by the twin actors Jason and Kristopher Simmons, throughout his run in the series, exempt only in the cases of his older, future self appearing.
* ''Series/{{Dollhouse}}'': in "The Attic", Enver Gjokaj's non-actor twin was used in a dream where Victor had to continually fight an enemy version of himself.
* ''Series/{{Sliders}}'': For three episodes, Rembrandt's double was played by Cleavant Derricks' twin Clinton Derricks-Carroll. In the first of these, they actually looked so different that it was preposterous Rembrandt's friends could get them confused. (The show even included a cringeworthy "how'd they do that?" scene with the doubles repeatedly circling each other in awe and touching each other's faces.) In the second, makeup made them sufficiently indistinguishable that they traded roles for the final scene, with Clinton playing the Rembrandt who slides away with the group. Few viewers noticed. In the low-budget Sci-Fi Channel seasons, Cleavant played all the Rembrandts.
* ''Series/FullHouse'': Mary Kate and Ashley Olsen spent eight years alternating in the role of Michelle, for the standard child labor law workaround. They were on screen simultaneously several times: a nightmare scene where Uncle Jesse sees two Michelles, an identical distant cousin visiting from Greece, a GoodAngelBadAngel scenario, and a dream sequence in the final episode when Michelle had amnesia and the other Michelle represented the memories that she'd forgotten.
* ''Series/BigBrother'': Reality TV example: In the Australian Big Brother house, a pair of twins posed as one housemate and would swap in and out at Big Bro's command. This happened in a season of the American version as well
* ''Series/{{Animorphs}}'': Jake (Shawn Ashmore) gets taken over by a Yeerk. The team needs a fake Jake while he recovers from the infestation. Ax morphs into Jake, a role played by the actor's twin Aaron. ''Far'' from the last time these two would be in the same show.
* ''Series/JukenSentaiGekiranger'' had an episode where the [=MOTD=] creates an EvilTwin of [=GekiBlue=], who was played by the actor's identical twin brother. These two have a habit of showing up in each other's shows.
* In episode 25 of ''Series/GoseiSentaiDairanger'', when the Dairangers fought evil clones of themselves, Kazu's evil clone was played by Daisuke Tsuchiya, the real-life twin brother of Kazu's actor, Keisuke Tsuchiya. The roles were later inverted in ''Series/BFighterKabuto'', where Daisuke was the main hero (Blue Beet), while Keisuke played his evil twin (Black Beet).
* When Jill Hennessey of ''Series/LawAndOrder'' was playing Claire Kincaid on a crossover with ''Series/HomicideLifeOnTheStreet'', she was mostly absent from the ''L&O'' set in New York. The producers brought her identical twin sister Jacqueline -- an occasional actress -- in to play Claire in the episode "Corpus Delicti" in wide shots, reaction shots and inserts, while Jill still filmed the dialogue scenes.
* In 1977, a year after Deirdre Hall began playing Dr Marlena Evans on ''Series/DaysOfOurLives'', her twin sister Andrea was brought in to play Marlena's twin Samantha. Samantha was later killed off, but Andrea Hall again returned to the show to play Marlena's doppelganger Hattie from 2000-2001.
* The [[SidAndMartyKrofftProductions Sid and Marty Krofft]] show ''Series/ElectraWomanAndDynaGirl'' did an episode where the evil Spider Lady turns herself into a look-alike of Electra-Woman. Once again, Deirdre Hall was Electra-Woman, while the Spider Lady doppelganger was played by Andrea Hall.
* Mexican telenovela ''La Usurpadora'' used actress Gabriela Spanic's twin sister Daniela for a fight scene and a few other scenes that would have been tricky to film with one actress alone.
* ''Scoundrels'' inverted, Patrick Flueger plays both Cal and Logan West. Coincidentally, they don't appear in many scenes together.
* An episode of ''Series/TheLatestBuzz'' involves Amanda dating a guy who looks exactly like Wilder, naturally he was played by Munro Chamber's twin.
* In the ''Series/AreYouAfraidOfTheDark'' episode "The Tale of the Chameleons," the story involved a chameleon who turns into a evil doppleganger of a teenage girl and tries to kill her and steal her life. Who else would they get but Tia and Tamera Mowry?
* The Mowry twins actually subvert this in ''Series/StrongMedicine''. Dr. Kayla Thornton, the local ex-TeenGenius HospitalHottie (Tamera), ''does'' have a twin named Kesha (Tia), but she only appears once in the plot. [[spoiler: And Kesha turns out to be TheOphelia, contrasting with SugarAndIceGirl Kayla.]]
* Done in ''Series/HouseOfAnubis'' where Jade Ramsey's twin, Nikita, was brought into the show for a few episodes to play Patricia's identical, yet [[PolarOppositeTwins completely opposite]] twin sister, Piper.
* In ''Series/OrangeIsTheNewBlack'', Laverne Cox's twin brother plays her character before her transition from male to female.
* ''Series/{{Smallville}}'', where AaronAshmore plays Jimmy Olsen, and Shawn Ashmore makes the occasional double work possible.
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[[folder: Professional Wrestling ]]

* While not actually a twin, wrestler Kurt Angle's older brother Eric looks quite a lot like him and is also a wrestler. On several occasions, WWE pulled a "switched Angles" plotline to let Kurt cheat his way to victory while his opponent was cluelessly attacking Eric.
* Also there's the Bella Twins, Brie and Nikki. Brie debuted first and, whenever she was in trouble, she rolled under the ring to let Nikki finish the match. Now they wrestle as a tag team. The twins revealed in an interview that in the early days when only Brie was wrestling regularly, sometimes Nikki would pretend to be her and go out and wrestle the match as her. They later revealed in another interview that one sister once had to break up with her boyfriend but couldn't go through with it, so the other sister did it in her place.
** Possibly subverted during a match with Maryse: Brie was hurt, so Nikki pulled her sister out of the ring while the ref was busy chastising Maryse. Maryse saw the switch and nailed Nikki with a [[FinishingMove French Kiss]].
** Parodied in a match where the twins wrestled Maryse and Wrestling/JillianHall. Jillian rolled Maryse out of the ring and lay down in her place attempting to pull the switch. Of course Jillian and Maryse aren't twins and the ref wasn't fooled.
* When the Wrestling/{{WWE}} acquired Dave Hebner's twin brother Earl from NWA, the creative got an idea where Ted [=DiBiase=] would hire Earl to impersonate Dave in order to screw Hulk Hogan out of the title. Thus, the infamous EvilTwin Referee match was born.
* Another not actually a twin example, the wrestling team "The Killer Bees" often donned their masks at the end of a match so that they could swap without using a tag and not have the referee realise the wrong man was in the ring.
* Irish wrestler Kasey Owens frequently would have her twin sister Leah hide under the ring and swap places with her to win matches. They don't do it regularly though as Kasey frequently alternates between brown and red hair, and Leah has a different set of tattoos.
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[[folder: Western Animation ]]

* Semi-example; when TheWho made a guest appearance as themselves on ''TheSimpsons'', Pete Townshend had a sore throat and wasn't able to read his lines, so his soundalike younger brother, Simon Townshend, read the lines on his behalf.
* ''WesternAnimation/TheClevelandShow'' had a fake LiveEpisode. When the AnimatedActor cast came on stage at the end, there were two copies of Rollo, implying this trope.

[[/folder]]

[[folder: Real Life]]
* Former professional baseball player and known goofball Jose Canseco once tried to have his twin brother Ozzie [[http://sports.espn.go.com/sports/boxing/news/story?id=6265329 take his place]] at a celebrity boxing match.
* Mario Andretti qualifies in second place for the 1969 Indy 500, then while practicing crashes and suffers facial burns (fortunately, much more common then than now). His injuries don't affect his plans to race, but they do affect the traditional front row photo, where the top three qualifiers pose in their cars. No problem, just get twin brother Aldo to pose in your place. Fellow front-row qualifiers A.J. Foyt and Bobby Unser ''don't even notice the stand-in''[[note]]Oh yeah, he went on to win the race.[[/note]].
* Without [[{{Spoiler}} spoiling the actual illusions]], let's just say that [[StageMagician stage magicians]] employ a ''lot'' of twins for their "[[LovelyAssistant lovely assistants]]."
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