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

19. 'The Quatermass Experiment' (1953)

Created by sci-fi Hall of Famer Nigel Kneale for the BBC, the hero of this gamechanging British TV series — Bernard Quatermass, a professor with a keen interest in extraterrestrials — would become iconic shortly after this first series' broadcast; not even a technical glitch during the airing of the final episode could derail the show's impact. Reginald Tate was the first of numerous actors to portray the alien-fighting intellectual, who'd further capture the public's imagination via radio programs, movies (including a big-screen remake of this serial in 1955, known as The Quatermass Xperiment) and several other TV shows; the 1979 four-episode miniseries, in which John Mills battles postapocalyptic hippies with a cosmic Stonehenge obsession, is a highpoint of U.K. sci-fi. But you never forget your first. DF

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