A monster lurks as New York newspaperman Lee Taylor investigates one of the "Moon Killer" murders, in which the victims are strangled, cannibalized, and surgically incised under the light of the full moon. The trail leads to the cliffside mansion of Dr. Xavier, where the doctor and his colleagues conduct a strange experiment. Cast: - Lionel Atwill as Dr. Jerry Xavier - Fay Wray as Joan Xavier - Lee Tracy as Lee Taylor, Daily World reporter - Preston Foster as Dr. Wells, Academy of Surgical Research - John Wray as Dr. Haines, Academy of Surgical Research - Harry Beresford as Dr. Duke, Academy of Surgical Research - Arthur Edmund Carewe as Dr. Rowitz, Academy of Surgical Research - Leila Bennett as Mamie, Dr. Xavier's maid - Robert Warwick as Police Commissioner Stevens - George Rosener as Otto, Dr. X's butler - Willard Robertson as Detective O'Halloran - Thomas Jackson as Daily World editor - Harry Holman as Mike, waterfront policeman - Mae Busch as Madam - Tom Dugan as Sheriff Runtime: 76 minutes