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