A boy's astronaut father accidentally has his brain switched with that of a chimp, but when he goes home, the boy cannot find anyone to believe the story. If they cannot get the transfer reversed in a short time, it will become permanent.
The teenage son of an astronaut tries to help his father after he and a chimpanzee switch brains as the result of a space flight mishap. The boy must protect the "chimp" (his father, who is unable to communicate vocally) and his father's body (with the chimp's mind) from the military personnel and anyone else.—Anonymous