Frankenstein's unscrupulous colleague, Dr. Bohmer, plans to transplant Ygor's brain so he can rule the world using the monster's body, but the plan goes sour when he turns malevolent and goes on a rampage.
Cedric Hardwicke
as Dr. Ludwig Frankenstein / Dr. Henry Frankenstein (ghostly image)
Ralph Bellamy
as Erik Ernst
Lionel Atwill
as Dr. Bohmer
Bela Lugosi
as Ygor
Evelyn Ankers
as Elsa Frankenstein
Lon Chaney Jr.
as The Frankenstein Monster
Janet Ann Gallow
as Cloestine Hussman
Barton Yarborough
as Dr. Kettering
Doris Lloyd
as Martha the Housekeeper
Leyland Hodgson
as Chief Constable
Olaf Hytten
as Adolph Hussman
Holmes Herbert
as Magistrate
