An exciting remake of the 1940 film One Million B.C. made a star out of Raquel Welch. She plays Loana, a member of the gentle, prehistoric Shell People tribe, which is trying to survive in a world fraught with such dangers as man-eating dinosaurs. One day, a stranger arrives, Tumak, who comes from the more aggressive Rock People clan and who has been banished from his home after quarreling with his father. Although Tumak is an outsider, Loana falls in love with him, and the two leave their clans behind to strike out on their own. They get into a series of perilous situations, which leads to a thrilling climax at an active volcano.