
The Duchy of Grand Fenwick decides that the only way to get out of their economic woes is to declare war on the United States, lose and accept foreign aid. They send an invasion force (in chain mail, armed with bows and arrows) to New York and they arrive during a nuclear drill that has cleared the streets.
Cast

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

Jean Seberg
Helen Kokintz

William Hartnell
Will Buckley

David Kossoff
Professor Alfred Kokintz

Leo McKern
Benter

MacDonald Parke
General Snippet

Austin Willis
United States Secretary of Defense

Timothy Bateson
Roger

Monte Landis
Cobbley

Alan Gifford
Air Raid Warden

Colin Gordon
BBC Announcer

Harold Kasket
Pedro

Guy Deghy
Soviet Ambassador (uncredited)

Eve Eden
Spectator (uncredited)

Bill Edwards
Army Captain (uncredited)
Mabel Etherington
Ada - Lady in Waiting (uncredited)
Muriel Greenslade
Lady in Waiting (uncredited)
Fred Haggerty
Fenwickian (uncredited)
Juba Kennerley
Maybury (uncredited)
George Margo
O'Hara (uncredited)

Lionel Murton
American General at the Pentagon (uncredited)

Bill Nagy
U.S. Policeman (uncredited)

Robert O'Neil
Reporter (uncredited)
Pat Ryan
American General (uncredited)
Stuart Saunders
Sergeant (uncredited)
Fred Stroud
Fenwickian (uncredited)
John Tatum
American Admiral (uncredited)

Mavis Villiers
Telephone Operator (uncredited)
Fred Wood
Bird Seller (uncredited)
Crew

Jack Arnold
Director
Roger MacDougall
Screenplay

Stanley Mann
Screenplay
Leonard Wibberley
Novel
Raymond Poulton
Editor
John Wilcox
Director of Photography
Philip Shipway
Assistant Director
Leon Becker
Production Supervisor
Walter Shenson
Producer
Jon Penington
Associate Producer
Austin Dempster
Camera Operator
Anthony Mendleson
Costume Designer
Joyce James
Hairdresser
Stuart Freeborn
Makeup Artist
John Winbolt
Second Unit Cinematographer
Richard Marden
Sound Editor
Red Law
Sound
George Stephenson
Sound
Edwin Astley
Original Music Composer, Conductor
Pamela Davies
Continuity
James H. Ware
Production Manager

Maurice Binder
Title Designer
Geoffrey Drake
Art Direction
Gerald Endler
Mechanical Designer
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