Barbara Shelley
— Leonora Johnson / Leonora Brandt
Robert Ayres
— Dr. Brian Marlowe
Kay Callard
— Dorothy Marlowe
Ernest Milton
— Edmund Brandt
Lily Kann
— Anna
Jack May
— Richard Johnson
Paddy Webster
— Cathy
John Lee
— Allan
Edward Harvey
— Doorman
Martin Boddey
— Cafferty
Selma Vaz Dias
— Nurse
John H. Watson
— Roberts
John Baker
— Male Nurse (uncredited)
Jim Tyson
— Barman (uncredited)
Frank Atkinson
— Guard (uncredited)
Geoffrey Tyrrell
— Caretaker (uncredited)