40 Best Science Fiction TV Shows of All Time

From superhero shows and space operas to creepy anthology series, the greatest small-screen sci-fi of all time

18. 'Dollhouse' (2009-2010)

Set in an underground facility where "actives" like Echo (Eliza Dushku) are imprinted with temporary personalities and offered to rich clients, Joss Whedon's series had the built-in flexibility to do something new with its characters every week. The show initially sent Echo on episodic adventures, ranging from prostitution to kidnapping negotiation. But as Dollhouse continued to evolve through its first and improbable second season, it grew into an immensely disturbing hour about corporate conspiracies, fluid identities, and — in a surprise twist — a tech-fueled Armageddon. ST

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