This sci-fi thriller differs from the rest in that its female protagonist, a troubled product of the British foster care system, discovers in the premiere episode that she's got a twin. This twin immediately throws herself in front of a train, leaving Sarah (played by the talented Tatiana Maslany) with a million questions, as you can imagine. Once she assumes her "twin's" identity, only to discover that this was no twin but a clone, the series only gets crazier. And then crazier still.
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