Ask any science-fiction movie fanatic what their go-to films are, and you'll get a lot of great answers back: Metropolis, Blade Runner, 2001, The Day the Earth Stood Still, the original Godzilla, The Thing etc. But let's face it – those answers are so last century. Great sci-fi movies didn't decide to party like it's 1999 then call it a day; a host of thrilling, intelligent, offbeat, funny and frightening SF films have hit art houses and multiplexes since Y2K.
In 2014, we concocted a list of the Best Sci-Fi Movies of the 21st Century — a quick and dirty survey of the best the genre has had to offer since the millennium's beginning. More than a few major science-fiction flicks, however – from franchise-expanding blockbusters to arthouse headscratchers – have dropped since then, so it was time for an overhaul and an update. We've now expanded our list to 40 titles, to better highlight the best and brightest SF films of our still-new–ish millennium. Some noteworthy favorites of ours just barely missed the cut (very sorry, Alex Rivera's Sleep Dealer) or some major titles were dinged on quality-control issues. (Avatar may have been a gamechanging film for 3D, but "unobtainium"? Really?!?) We're confident, however, that there's a place in the canon for these relative latecomers.