Set in the stone age, the stooges are cavemen who must have various misadventures hunting, gathering, and otherwise coping with prehistoric life. When some other cavemen threaten to take their women ("Aggie", "Maggie", and "Baggy"), the boys fight them off with a catapulting tree branch that shoots rocks and eggs.

A professor bets one of his colleagues that he can turn the Stooges into gentlemen within 60 days. With the aid of his pretty daughter, the professor tries to teach the boys proper etiquette. After many frustrating attempts, he introduces the Stooges into society at a fancy party. At first things go all right, but the party soon degenerates into a wild pie fight.