Raymond Massey
John Cabal / Oswald Cabal
Edward Chapman
Pippa Passworthy / Raymond Passworthy
Ralph Richardson
The Boss
Margaretta Scott
Roxana / Rowena
Cedric Hardwicke
Theotocopulos
Maurice Braddell
Dr. Harding
Sophie Stewart
Mrs. Cabal
Derrick De Marney
Richard Gordon
Ann Todd
Mary Gordon
Pearl Argyle
Catherine Cabal
Kenneth Villiers
Maurice Passworthy
Ivan Brandt
Morden Mitani
Anne McLaren
The Child
Patricia Hilliard
Janet Gordon
Charles Carson
Great Grandfather
Patrick Barr
World Transport Official (uncredited)
Noel Brophy
Irishman (uncredited)
John Clements
The Airman (uncredited)
Anthony Holles
Simon Burton (uncredited)
Allan Jeayes
Mr. Cabal (uncredited)
Pickles Livingston
Horrie Passworthy (uncredited)
George Sanders
Celestial Body (uncredited)
Abraham Sofaer
The Jew (uncredited)
Terry-Thomas
Man of the Future (uncredited)