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Trailers shown here are official content embedded from YouTube. Watch the full titles on the rights-holders' official streaming platforms.© 2026 123Movies. All rights reserved.
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Science Fiction Movies & TV Shows Online Free

Stream the best Science Fiction movies and TV shows free on 123Movies in HD. Browse 26,777 Science Fiction titles — no signup, no subscription required. Updated daily with the newest Science Fiction releases.

Flash Gordon Conquers the Universe (1940)HD
Flash Gordon Conquers the Universe (1940)
Psychovision (2003)HD
Psychovision (2003)
Misterio (2013)HD
Misterio (2013)
Donny The Drone (2017)HD
Donny The Drone (2017)
The Flying Saucer (1950)HD
The Flying Saucer (1950)
Gamera vs. Guiron (1969)HD
Gamera vs. Guiron (1969)
Ben Gen 10 (2021)HD
Ben Gen 10 (2021)
The Lord of All Future Space & Time (2025)HD
The Lord of All Future Space & Time (2025)
Gog (1954)HD
Gog (1954)
Living with the Dead (2002)HD
Living with the Dead (2002)
Undersea Fleet Submarine 707F (1997)HD
Undersea Fleet Submarine 707F (1997)
The Unseen (2016)HD
The Unseen (2016)
Giant Robo: The Day the Earth Stood Still (1992)HD
Giant Robo: The Day the Earth Stood Still (1992)
Mars of Destruction (2005)HD
Mars of Destruction (2005)
Star Pilot (1966)HD
Star Pilot (1966)
Red Planet Mars (1952)HD
Red Planet Mars (1952)
Battle of Los Angeles (2011)HD
Battle of Los Angeles (2011)
Day the World Ended (1955)HD
Day the World Ended (1955)
Monster of Lake Heaven (2020)HD
Monster of Lake Heaven (2020)
Wellspring (1991)HD
Wellspring (1991)
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123Movies

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