Maxus (Reg Lewis), nomadic son of Hercules, rescues Idar (Luciano Marin), prince of a sun-worshipping tribe, from a lake monster. When a band of cave-dwelling moon-worshippers descends on the Sun People and kidnaps their women for human sacrifice, Maxus leads a counterattack. He rescues the captured women but is abducted himself, before escaping with beautiful moon-worshipper Moah (Margaret Lee). But ahead are more battles with beasts and the Moon People, now allied with an even nastier tribe.
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https://www.youtube.com/watch?v=D9SwkEtaj-c
An Japanese science fiction tokusatsu film released in January 1956 by Daiei, and was the first Japanese science fiction film to be produced in color. In the film's plot, starfish-like aliens disguised as humans travel to Earth to warn of the imminent collision of a rogue planet and Earth. As the planet rapidly accelerates toward Earth, a nuclear device is created at the last minute and destroys the approaching world. Film is in the public domain in the United States.
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https://www.youtube.com/watch?v=pdQhf5df4b4