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)