
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.
Cast

Bela Lugosi
Dr. Paul Carruthers

Suzanne Kaaren
Mary Heath

Dave O'Brien
Johnny Layton

Guy Usher
Henry Morton

Yolande Donlan
Maxine

Donald Kerr
'One-Shot' McGuire
Edmund Mortimer
Martin Heath

Gene O'Donnell
Don Morton
Alan Baldwin
Tommy Heath
John Ellis
Roy Heath

Arthur Q. Bryan
Joe McGinty

Hal Price
Chief Wilkins

John Davidson
Prof. Percival Garland Raines
Billy Griffith
Coroner (scenes deleted)
Wally Rairden
Walter King
Crew

Jean Yarbrough
Director
John T. Neville
Screenplay
Holbrook N. Todd
Editor
Arthur Martinelli
Director of Photography
Jack Gallagher
Producer
Guy V. Thayer Jr.
Associate Producer
Ferrol Redd
Sound Engineer
David Chudnow
Music Director
Melville De Lay
Production Manager
George Bricker
Original Story
Paul Palmentola
Art Direction
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