After a series of murders, a man finds out that his mother was bitten by a vampire bat during her pregnancy, and he believes that he may be the vampire committing the murders.

Ralph Morgan
as Paul Kristan

Pedro de Cordoba
as Anders Bizet

Maxine Doyle
as Marguerite Mane

Russell Gleason
as David

Mischa Auer
as Zan

Lucy Beaumont
as Mother Molly

Carl Stockdale
as John Mane

Barbara Bedford
as Martha Kristan

Robert Frazer
as Dr. Duprez

Ferdinand Schumann-Heink
as Franz Kristan
CinemaSerf
Kindly old doctor "Prof. Kristen" (Ralph Morgan) finds himself amidst a spate of brutal murders - but it's only when he is told that his pregnant mother was bitten by a bat before he was born, that he considers that he might be the man responsible - especially as he has become prone to blackouts whe...