Looking for some great sci-fi movies that you can stream for free? We've got a great collection of classics and modern favorites to watch right now.. From towering kaiju monsters battling one another to low-budget indies waiting to warp your mind, Tubi's collection of sci-fi movies has no limits.
![35 Best SciFi Movies Streaming [September 2023]](https://www.looper.com/img/gallery/best-sci-fi-movies-streaming/l-intro-1688586057.jpg "35 Best SciFi Movies Streaming [September 2023]")
Sci-fi movies can take us to distant worlds and reveal fantastic futures beyond belief. Time-traveling cyborgs, dystopian futures, and more are here for you to discover. Grab some popcorn and head into adventure.. Check out these great sci-fi movies like Species and Super 8, which are now streaming for free on Tubi and other sites.