Dr. Rock and his sadistic assistant Dr. Brown clear up the imprisoned Clint Wayne: Kraven is Dr. Rock's brother Victor, whom he kept hidden in a cabin in the woods for years because he committed murder. For this, Victor had to serve Rock's cruel experiments. After a bitter disfigurement, he fled into nowhere and from then on was up to mischief as a serial killer who can only be killed with his own knife. No sooner has Wayne been cleared up than Kraven appears on the scene and takes cruel revenge on his brother and his nasty henchman Dr. Brown. Wayne manages to plunge his own knife into Kraven's body, destroying him forever. But is it really forever?