Sci-fi thriller Orphan Black operates on a different playing field from the start. Its badass female protagonist, a troubled product of the British foster care system, discovers in the first episode that she's got a "twin." This twin immediately throws herself in front of a train, leaving Sarah (played by the uber-talented Tatiana Maslany) with a million questions, as you can imagine. Once she assumes her "twin's" identity — only to discover she's actually a clone — the BBC series only gets crazier. And then crazier still. Worth the watch for Tatiana Maslany's incredible acting chops alone!