Maxus, the nomadic son of Hercules, rescues Idar, a 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. But ahead are more battles with beasts and the Moon People, now allied with an even nastier tribe. Starring Reg Lewis, Luciano Marin and Margaret Lee. Maybe this was an early use of solar panels?