Two astronauts (David and Cody) crash land on a planet with cave people inhabiting it. The males are primitive and violent. The females are intelligent and have trained themselves in martial arts. A mysterious woman appeared a long time ago "before David and Cody's time" and gave the women a book of knowledge. The mysterious woman's fate isn't discussed. The astronauts want to sleep with the women. First, David decides to help them save one of the girls that's kidnaped by the men. Cody has nefarious intentions. The women want to teach the men how to be civil. A war between cavemen and cavewomen will erupt with two astronauts in the middle.