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)