Steve and Rudy go to check up on a scientist, Cheryl Osborne, who was doing research on chimpanzees but who has ceased communications. When they arrive they find something has destroyed the lab, and Rudy is bitten by a rampaging chimpanzee. Rudy begins to turn into a psychotic and Steve must both stop him and find Osborne before it's too late.
Elenco: Lee Majors , Martin E. Brooks , Richard Anderson .