A couple of added dialogue scenes were spliced into what was essentially a travelogue and a series of close-ups of an enraged orangutan.

A noted big game hunter, Bob Ward (John Preston), is visited in the jungles of Borneo by Russian scientist Boris Borodoff (Eugene Sigaloff) and his assistant Alma Thorne (Mae Stuart), who want to prove the evolutionary link between man and beast.

Ward at first declines to lead the scientists to a tribe of orangutans, but Alma's charms finally convince him.

Borodoff, it soon appears, is insane—and Bob, in an effort to calm him down, is knocked unconscious and dragged into the jungle by the tormented orangutan.

He is rescued by Alma and Borneo Joe, but the trio can only watch as the enraged ape kills Dr. Borodoff.