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plural doppelgangers
A ghostly double of a living person, especially one that haunts such a person. examples
An evil twin. examples
A remarkably similar double. quotations examples
Stars in Their Eyes ran for 16 years from 1990, and had the "wow" factor moment of transforming a pub singer into their idol, as the contestant said the famous words: "Tonight Matthew, I'm going to be…" and then stepped out from a puff of dry ice as their musical doppelganger.
2021 September 15, Laura Martin, “How talent shows became TV's most bizarre programmes”, in BBC
(fantasy) A monster that takes the forms of people, usually after killing them. examples