A college nerd (Billy Jacoby) learns his biology teacher (Judy Landers) is an alien who needs him for a breeding experiment.

A young extraterrestrial, separated from its family and stranded on Earth, finds friendship with a boy in a wheelchair.

Marilyn Fryser, a land developer, takes a few clients to see an estate with the intention of duping them. However, her plan is interrupted by a colony of giant ants who feed on human blood.

While traveling across a barren landscape, caveman Yor (Reb Brown) arrives at a village in time to save the people from a dinosaur attack. During a feast held in his honor, Yor manages to rescue beautiful Ka-Laa (Corinne Clery) and her guardian, Pag (Alan Collins), from a raid by a hostile neighboring tribe. After being told about another woman who wears the same mysterious medallion he has always had, Yor and his new companions set out to find her and learn about his destiny.