A mysterious vigilante known as Dr. RX strikes again, leaving his calling card behind as evidence. All of his victims have been crooks who have escaped prosecution through legal loopholes and his hit list keeps growing. Assigned to the case is private detective Jerry Church (Patric Knowles) but the crimes are baffling and involve death by strangulation and a possible attempt to implant a gorillas brain into a human body. The Strange Case of Doctor RX (1942) is an offbeat horror-comedy film starring Lionel Atwill, veteran of such macabre classics as Doctor X (1932) and Mystery of the Wax Museum (1933), and featuring Shemp Howard (of the Three Stooges) as a bumbling police sergeant.