|Lon Chaney Jr.||Akhoba|
|Conrad Nagel||Narrating Archaeologist|
|Robert Kent||Mountain Guide|
|Mary Gale Fisher||Wandi|
|Nigel de Brulier||Peytow|
In the survival-of-the-fittest mentality of the Rock tribe, the strongest receive the best of everything, while the scraps are left for the weak. When Tumak fails to protect what is his from the tribe's leader, Akhoba, the Rock people send Tumak into exile. Discovered by Loana, a member of the peaceful Shell tribe, Tumak reluctantly joins her strangely kind people. Tumak struggles to adapt, but Loana will not give up on changing his savage ways.