Dr. Roger Girard is a rich scientist conducting experiments on head transplantation. His caretaker has a son, Danny, who, although fully grown, has the mind of child. One day an escaped psycho-killer invades Girard's home, killing Danny's father before being gunned down himself. With the maniac dying and Danny deeply unsettled by his father's death, Dr. Girard decides to take the final step and transplant the killer's head onto Danny's body.

Bigfoot kidnaps some women and some bikers decide to go on a rescue mission to save them.

In a small southern swamp town, a local girl is found murdered. A young California man passing through town is blamed, and in fleeing the local lynch mob he escapes into the Okeefeenokee Swamp, where he runs into even more dangers.

Jewel thieves quickly dispose of the loot when the alarm is raised, then track down the family upon whose truck they threw them, meanly interrogating them in the hope of getting them back.