Comedians Sammy Petrillo and Duke Mitchell, a more than obvious rip off of Jerry Lewis and Dean Martin, end up in the remote island of Cola-Cola after a plane accident, and are taken by the native chief Rakos (Al Kikume) and her daughter Nona (Charlita), who falls in love with Mitchell. They are taken to and old castle, were Dr. Zabor (Bela Lugosi) makes his strange experiments with apes. Jealous of Nona, for whom he has a secret love, Zabor decides to turn Mitchell into a gorilla, but things don't go as planned.