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

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4. 'Doctor Who' (1963-Present)

Longevity is the name of the game for this 52-year-old BBC series, which at this point is as hallowed a British institution as the monarchy. Despite decades of lore, the premise is winningly simple: A charming alien travels through time and space in a dinged-up blue box, doing his level best to save the day. He picks up traveling companions along the way, and every so often he regenerates into a brand-new body. Everyone has "their" Doctor, depending on when they first picked up the show (there've been 12 so far; currently it's Peter Capaldi). Doctor Who slides giddily between silliness and profundity without ever losing momentum or heart. Like the TARDIS, it's bigger on the inside; there's space for all of it. JS

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