All Sci-Fi Movies and Shows You Can Stream This Week at Home or Watch in Theaters, Including ‘Adventure Time: Fionna & Cake’

Here are the key sci-fi releases for this week with exact dates, where to watch, core premise, and essential specs so you can plan quickly.

‘Bugonia’ (2025)

Opens in limited theaters on Friday, October 24, via Focus Features, with a wider expansion the following week. The story follows two men who kidnap a powerful CEO they believe is an alien intent on destroying Earth. It is rated R and runs 1 hour 58 minutes. Festival play included Venice competition ahead of the U.S. rollout.

‘Adventure Time: Fionna & Cake’ (2023– )

Season 2 debuts Thursday, October 23, on Max, with ten episodes released weekly through December 25. The series centers on Fionna, Cake the Cat, and Simon Petrikov within the broader ‘Adventure Time’ universe. Episodes stream exclusively on Max for subscribers in supported regions. Warner Bros. Discovery confirmed the premiere date and cadence.

‘Afterburn’ (2025)

Begins streaming Tuesday, October 21. Set after a solar flare wipes out modern technology, it follows an ex-soldier turned treasure hunter on a high-stakes retrieval mission in Europe. The film is rated R with a listed runtime of 1 hour 45 minutes and genres spanning action, adventure, comedy, and sci-fi. Limited theatrical play preceded the at-home release.

‘Intruder’ (2025)

Starts streaming Friday, October 24, on platforms including Tubi and Fandango at Home, with cable VOD availability announced by the distributor. The plot tracks an underground fighter and her estranged father on a stolen spacecraft, where a stowaway sabotages life support. Listed runtime is about 1 hour 25 minutes; distributor is Buffalo 8; writer-director is Christian Jude Grillo. Platform and date confirmations were provided in the release announcement and trailer materials.

Tell us which of these you’ll watch first—and where you’re pressing play—down in the comments.