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
John Chard
Imbecile, Bombastic, Ignoramus. The Devil Bat is directed by Jean Yarbrough and written by George Bricker and John T. Neville. It stars Bela Lugosi, Suzanne Kaaren, Dave O’Brien, Donald Kerr and Gary Usher. The Heathville Horror! Straight out of Poverty Row is this PRC production that’...
CinemaSerf
OK, so almost all of the peril comes from a man out of shot careering about with a plastic bat on the end of a fishing rod, but somehow this daft sci-fi hokum makes a point. It's all about the rather shrewd scientist "Carruthers" (Bela Lugosi) who feels slighted by his pals who made a load of long-t...