It’s the stuff of nightmares. You return home, only to discover that you are already there: a facsimile is duping your loved ones and taking over your life. The existence of a malevolent doppelganger is a universal, enduring fear, and filmmakers across the spectrum, from Alfred Hitchcock (Vertigo) to Darren Aronofsky (Black Swan), Richard Ayoade (The Double) and Denis Villeneuve (Enemy), have mined its potential for thrills.

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