George Sanders
— Anton Ragatzy
Mary Maguire
— Lalage Sturdee
Barbara Blair
— Wendy
Peter Murray-Hill
— Basil Owen
Frederick Leister
— Joseph Sturdee
Walter Hudd
— Dr. Helmore
Kathleen Harrison
— Mrs. Coates
Kynaston Reeves
— Sir Montague Tollemach
Edmund Breon
— Dr. Ladd
Ralph Truman
— Sir Nathan Israel
Bernard Lee
— Cameraman
Wilfrid Hyde-White
— Cured Patient
Roddy McDowall
— Cured Child