A renegade scientist invents a drug to bring out man's bestial instincts, turning them into killing machines.An associate of Cap's kills his family and then himself under the influence of this.A young telepath who has information has been imprisoned and is due to be the subject of one of those hunt to the death games unless Kennedy gets there first. Cap needs this information to find the evil scientist and give him the energy weapon sayonara.Having tracked the scientist down, and upon infiltration of his base, it takes all his abilities and the 'Ghergach System of Disorientation' for him to resist the drug and not go to beast man himself.