Classic public domain film, digitally preserved and free to stream forever.
Prisoner of the Lost Universe (1983) is a sci-fi adventure in which a TV reporter, a scientist, and a martial artist are accidentally transported through a matter transfer device to a savage parallel dimension ruled by a tyrannical warlord, and must fight their way to freedom using their wits and whatever weapons they can find.
Starring Richard Hatch, Kay Lenz, and John Saxon. This film is in the public domain and free to watch, download, and share.