The stooges hope to collect a reward by proving to a museum that cavemen still exist. They return from their expedition with a film purporting to show some stone age stooges defending their women from other cavemen. The museum curators are about to pay they reward, until they overhear the stooges talking about how they faked the film, with themselves playing the cavemen.

Shemp dies but cannot get into heaven until he reforms Moe and Larry. He returns to earth as an invisible spirit and sets out to prevent the other two stooges, who are in league with the devil, from selling a phony invention (a fountain pen that writes under whip cream) to a rich couple. Shemp sabotages Moe and Larry's plans in an effort to get through the pearly gates.

Moe, Larry and Curly appear in short subjects linked by ventriloquist Paul Winchell and his dummies.

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.