Vincent Price as Dr. Erasmus Craven

Peter Lorre as Dr. Adolphus Bedlo

Boris Karloff as Dr. Scarabus

Hazel Court as Lenore Craven

Olive Sturgess as Estelle Craven

Jack Nicholson as Rexford Bedlo

John Dierkes as Roderick Craven

Connie Wallace as Maid

William Baskin as Grimes

Aaron Saxon as Gort

Leo Gordon as Grimes (voice) (uncredited)

Dick Johnstone as Roderick Craven (uncredited)