Classic public domain film, digitally preserved and free to stream forever.
Attack of the Monsters (1969), also known as Gamera vs. Guiron, follows two young boys who are abducted by a flying saucer and taken to a distant planet where two alien women plan to eat their brains — leaving Gamera, the giant flying turtle, to cross the cosmos and rescue them.
Starring Nobuhiro Kajima, Christopher Murphy, and Miyuki Akiyama. This film is in the public domain and free to watch, download, and share.