IMDb users have determined the best sci-fi movies ever made, which include genre-defining classics like Alien and mind-bending films like Inception.

The last decade has produced a wide variety of sci-fi movies, from epic blockbusters to cerebral dramas, some of which have become instant classics.

We're only one quarter of the way through the 21st century, yet these past 25 years have played host to some of the greatest sci-fi movies ever.

But if you're looking for the best sci-fi movies of all time, the Watch With Us team is here to tell you what they are and where to find them. 14 Must-See Sci-Fi Movies to Stream Right Now (June 2025) ...