Duchy of Grand Fenwick Collection

David Kossoff

Professor Alfred Kokintz / Professor Kokintz

Guy Deghy

Soviet Ambassador (uncredited) / Russian Scientist

Fred Wood

Bird Seller (uncredited) / Bird Seller (Uncredited)

Stuart Saunders

Sergeant (uncredited) / Sergeant (Uncredited)

Bill Edwards

Army Captain (uncredited) / American Astronaut

Peter Sellers

Grand Duchess Gloriana XII / Prime Minister Count Rupert Mountjoy / Tully Bascombe

Jean Seberg

Helen Kokintz

Leo McKern

Benter

John Wood

Countryman

Ed Bishop

American Astronaut (as Edward Bishop)

John Le Mesurier

British Delegate

William Hartnell

Will Buckley

Margaret Rutherford

Grand Duchess Gloriana XIII

Terry-Thomas

Maurice Spender

Colin Gordon

BBC Announcer

Vincent Ball

Pilot

Ron Moody

Prime Minister Rupert Mountjoy

Robin Bailey

Member of Whitehall Conference

Peter Sallis

Russian Delegate

Austin Willis

United States Secretary of Defense

Tom Aldredge

Wendover

Graham Stark

Standard Bearer

John Bluthal

Von Neidel (as John Bluthall)

Bruce Lacey

Bandleader (Uncredited)

Eric Barker

M.I.5. Man

Timothy Bateson

Roger

Bernard Cribbins

Vincent Mountjoy

Eve Eden

Spectator (uncredited)

Richard Marner

Russian Air Force General

Archie Duncan

U.S.A.F. General