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Prehistoric man Tumak is banished from his savage tribe and meets pretty Loana, who belongs to a gentler coastal tribe, but he must fight caveman Payto to win her favors.

Caveman Tumak (John Richardson) is banished from his savage tribe. He finds a brief home amongst a group of gentle seacoast dwelling cave people until he is banished from them as well. Missing him, one of their women, Loana (Raquel Welch), leaves with him, deciding to face the harsh prehistoric world with its monsters and volcanoes as a couple.—Jim Cobb

Tumak (John Richardson), a member of the Rock Tribe, is expelled from their cave after running afoul of their leader Akhoba (Robert Brown), who also happens to be his father. After several days of wandering, he stumbles upon several female members of the Shell Tribe, a group that lives on the coast. Loana (Raquel Welch), the daughter of the Chief, sees that he is in terrible shape from his ordeal and nurses him back to health. This causes her betrothed, Payto (William Lyon Brown), to become jealous and eventually the two of them get into a major fight and Tumak (John Richardson) is expelled as a result. However, Loana decides to join him and follows him back to the caves of his people. While there Loana teaches the Rock people civility and this causes Tumak to become the new leader (Akhoba was severely injured while Tumak was away). This doesn't sit well with Tumak's brother Sakana (Percy Herbert), who begins to plot to have Tumak overthrown.—Brian Washington <Sargebri@att.net>