An astronaut goes into space with a chimpanzee. When they return to Earth after their orbit, it is discovered that the chimp has the brains of the astronaut, and the astronaut has the brains of the chimp. Complications ensue.
Frankie, in Tahiti for naval duty, has Bwana the witch doctor create a floating bikini inhabited by Cassandra to keep ad exec Ricky away from Dee Dee, whom Frankie doesn't trust.
