It was the decade that gave the world the maverick New Hollywood drama, the Nixon-era paranoid thriller, the slasher flick, the all-star disaster movie, the gross-out comedy and the modern mega-blockbuster. But the Seventies were particularly kind to one specific cul-de-sac of cinema: the science fiction film, a subset category that was still buzzing from its late-Sixties head-trip phase courtesy of 2001: A Space Odyssey. As the Age of Aquarius slowly slid into the beginning of the nation's Watergate-and-disco period, you could still find sci-fi movies that wanted to blow an audience's possibly addled, probably enhanced mind. But by the end of the 1970s, it was possible to have checked out postapocalyptic action-adventures, future-shock case studies, technophobic nightmares, low-budget exploitation movies about what-if scenarios and big-budget space operas — all of which fell under the S.F. umbrella and helped turn the genre into a gamechanger. And as anyone who saw Guardians of the Galaxy or Interstellar last year will tell you, the influences of this period are still showing up in theaters near you.
So, in honor of the 10-year-period that made science-fiction filmmaking what it is today, we are counting down the 50 best sci-fi movies of the 1970s. Some of them belong in the greatest-of-all-time canon; others, we will fully admit, are the cinematic equivalent of a ripe Camembert. But each of these helped the decade redefine where science fiction could go on the big screen, whether it was in a grungy grindhouse or a state-of-the-art multiplex. This is where the genre genuinely started to boldly go where it had never gone before.