A young Seminole indian boy comes of age outside the Florida Everglades by trying to enter the establishment (white man's world). He gets work as crew member on (Brian Keith's) fishing boat, hunts for alligators and has cathartic encounters with bad guys trying to bring illegal aliens into Florida on fishing boats.
A spaceship is sent to Mars after an alien distress signal is picked up. They find one survivor, but when a crew member is found drained of blood it's evident they have rescued a bloodsucking monster. Uses footage from Encounter in Space (1963).
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.