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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21. 'Quantum Leap' (1989-1993)

Who among us hasn't wished we could go back to the past and set things to right? And who wouldn't want a charming, funny holographic companion for buddy-comedy shenanigans along for the ride? These two elements constitute the core appeal of Quantum Leap, in which Dr. Sam Beckett leaps through time and inhabits people's bodies to fix the mistakes of the past, egged on all the while by his advisor Admiral Al Calavicci. Starring Scott Bakula and Dean Stockwell, two of the genre's most endearing actors, it made its high concept work with down-to-earth heart. STC

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