Vincent Price
Dr. Erasmus Craven
Peter Lorre
Dr. Adolphus Bedlo
Boris Karloff
Dr. Scarabus
Hazel Court
Lenore Craven
Olive Sturgess
Estelle Craven
Jack Nicholson
Rexford Bedlo
John Dierkes
Roderick Craven
Connie Wallace
Maid
William Baskin
Grimes
Aaron Saxon
Gort
Leo Gordon
Grimes (voice) (uncredited)
Dick Johnstone
Roderick Craven (uncredited)