Boris Karloff as Dr. Thomas Bolton

Betta St. John as Susan

Christopher Lee as Resurrection Joe

Finlay Currie as Supt. Charles Matheson

Adrienne Corri as Rachel

Francis de Wolff as Black Ben

Francis Matthews as Jonathan Bolton

Frank Pettingell as Mr. Blount

Basil Dignam as Hospital Chairman

Nigel Green as Insp. Donovan

Yvonne Romain as Rosa (as Yvonne Warren)

Howard Lang as Chief Inspector

Charles Lloyd Pack as Hardcastle

Bernard Archard as Hospital Official

Marianne Stone as Arrested Woman (uncredited)

Desmond Llewelyn as Operations Assistant (uncredited)

Skip Martin as (uncredited)