When two men crashland in the Amazon, they encounter a tribe led by the bizarre Bombu, who displays amazing magical powers such as causing a building to appear in the middle of the jungle. However, during a storm, a lightning bolt strikes Bombu down just as he's about to kill the foreigners. They are horrified to find that Bombu's tribal mask is no mask at all, but his actual face, and he is a member of a soon-to-be invading alien race.