Albert Werper follows Tarzan into the treasure vaults of Opar, where an earthquake knocks the Lord of the Apes unconscious and devolves him into the Apeman he once was. After rejecting La of Opar's advances, Tarzan must battle the Beastmen of Opar.
Script: Roy Thomas
Pencils: John Buscema
Inks: Tony DeZuniga
Colors: George Roussos
Letters: Joe Rosen
