Caveman tries to blend in with friends

High school misfits Stoney and Dave discover a long-frozen primeval man buried in their backyard. But the thawed-out Link—as the boys have named him—quickly becomes a wild card in the teens' already zany Southern California lives. After a shave and some new clothes, Link's presence at school makes the daily drudgery a lot more interesting.

Romulus, a misunderstood musician turned recluse hiding from personal demons in a New York City cave, finds the frozen body of a young drifter in a tree. The authorities, including his police officer daughter, claim the death is accidental. Romulus is convinced the man was murdered by a prominent art photographer but how can he prove he's right when everyone thinks he's insane?

Disgraced and cast out of his tribe for lusting after Lana, the mate of the tribe's head muscle man, Atouk stumbles along gathering other misfits and learning a bit about the world outside of his cave. Eventually he and friends Lar and Tala learn the secrets of fire, cooked meat, and how to defend themselves from the brutal, yet very stupid dinosaurs.