A crazed scientist needs primates to conduct experiments to prove his own theory of evolution, so he organizes an expedition into the jungles of Borneo to capture the animals he needs.
| Actor | Role |
|---|---|
| MMae StuartAlma Thorne | Alma Thorne |
| JJohn PrestonBob Ward | Bob Ward |
| EEugene SigaloffDr. Boris Borodoff | Dr. Boris Borodoff |
| AAlexander SchoenbergDerrik Van De Mark (as Alexander Schonberg) | Derrik Van De Mark (as Alexander Schonberg) |
| DDoris BrookNahnda | Nahnda |
| VVal DuranDarmo (as Val Durran) | Darmo (as Val Durran) |
| JJohn S. PetersKruger (as John Peters) | Kruger (as John Peters) |