Classic public domain film, digitally preserved and free to stream forever.
Attack from Space (1965) is a Japanese superhero sci-fi film featuring the comic book hero Starman, who is dispatched by the Galactic Council to defend Earth from the warlike Spartan Empire — whose agents have infiltrated the planet and are plotting to seize control of humanity's nuclear weapons.
Starring Ken Utsui, Junko Ikeuchi, and Minoru Takada. This film is in the public domain and free to watch, download, and share.