Left for dead in Vietnam, Lieutenant Cotter became a guinea pig for KGB baddie Mitovitch. Implanted with a mind control microchip, he is turned into a mindless killer. His colleague Lieutenant Sanders goes looking for him in Cambodia, then in El Salvador, where they kill pretty much everyone they meet.
Billy Chapman, who was traumatized by his parents' Christmas Eve murder, then brutalized by sadistic orphanage nuns, grows up to dress as jolly St. Nick for a yuletide rampage to punish the naughty.