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.

Bruce Dern
as Roger

Pat Priest
as Linda

Casey Kasem
as Ken

Albert Cole
as Cass

Berry Kroeger
as Max

Larry Vincent
as Andrew

Jack Lester
as Sheriff

Jerry Patterson
as Deputy

Darlene Duralia
as Miss Pierce

Gary Kent
as Motorcyclist