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Twin. Doppelganger [actually it's "Doppelgänger", with an umlaut, thank you] is the German word for a ghostly double of a living person or more commonly simply a word for someone looking exactly like someone else, i.e. an impostor or double. It means "double (walker)", in the original.

We shall place aside the fact that the use of a doppelganger is a way to get two roles out of the same player, because we are big in that way.

Doppelgangers usually need a setup. If you spring a twin on the audience, you will get some groans.

See also Evil Twin, Identical Stranger, Mirror Universe.
Examples:
  • On Friends, Rachel dates Ross-clone Russ, also played by David Schwimmer.
  • In Hope & Gloria, talk show host Dennis Dupree (Alan Thicke) and Alan Thicke (Alan Thicke, guest-starring) despise each other. This comes to a climax at a Growing Pains reunion on Dupree's show which ends in a Thicke on Thicke fistfight.
  • In the 2000s Battlestar Galactica, each Cylon model has a potentially infinite number of doppelgangers.
  • In the Route 66 episode "I'm Here to Kill a King," Tod Stiles discovers that he has an exact double who happens to be a professional assassin.
  • Supernatural has had two doppelganger episodes: "Skin" and "Nightshifter."