Since the times of ancient Greece, popular culture has entertained stories of artificial humans. Our modern fears about the "otherness" of androids and human replicants have much in common with fears of the Doppelganger, a mythological harbinger of death. Throughout the twentieth century, "AI" technologies have developed at a rapid pace, bringing us face to face with these ancient fears in a modern context. Examining such films as The Day the Earth Stood Still, Forbidden Planet and Blade Runner, among others, this book charts cinema's fascination with artificial intelligence and the technological double, as well as the historical antecedents of the artificial human.