Dr. Paul Carruthers is frustrated because he thinks his employers, Mary Heath and Henry Morton, have cheated him out of the company's profits. He decides to get revenge by altering bats to grow twice their normal size and training them to attack when they smell a perfume of his own making. He mixes the perfume into a lotion, which he offers as a gift to Mary and Henry. When they turn up dead, a newspaper reporter decides to investigate.
Bela Lugosi
as Dr. Paul Carruthers
Suzanne Kaaren
as Mary Heath
Dave O'Brien
as Johnny Layton
Guy Usher
as Henry Morton
Yolande Donlan
as Maxine
Donald Kerr
as 'One-Shot' McGuire
Edmund Mortimer
as Martin Heath
Gene O'Donnell
as Don Morton
Alan Baldwin
as Tommy Heath
John Ellis
as Roy Heath
Arthur Q. Bryan
as Joe McGinty
Hal Price
as Chief Wilkins
