Edward Judd as Arnold Bedford

Martha Hyer as Kate Callender

Lionel Jeffries as Joseph Cavor

Miles Malleson as Dymchurch Registrar

Norman Bird as Stuart

Gladys Henson as Nursing Home Matron

Hugh McDermott as Richard Challis

Betty McDowall as Margaret Hoy

Erik Chitty as Gibbs (uncredited)

Douglas Ives as Sparks (uncredited)

Peter Finch as Bailiff's Man (uncredited)

Marne Maitland as Dr. Tok, UN Space Agency (uncredited)

Laurence Herder as Glushkov, UN Space Agency

Paul Carpenter as Reporter from the 'Express' (uncredited)

John Forbes-Robertson as First Reporter (uncredited)

Kenneth Watson as Second Reporter (uncredited)

Sean Kelly as Col. Rice, Moon Landing Crew (uncredited)

Gordon Robinson as Sgt Andrew Martin, Moon Landing Crew (uncredited)

John Murray Scott as Cosmonaut Nevsky, Moon Landing Crew (uncredited)

Brook Williams as British Astronaut, Moon Landing Crew (uncredited)

George Hilsdon as Constable (uncredited)

Mary Maxfield as Nurse (uncredited)

Huw Thomas as Announcer (uncredited)

Valentine Dyall as Narrator (uncredited)