The Mouse That Roared— Full Cast

George Stroumboulopoulos

as Host

Peter Sellers

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

Jean Seberg

as Helen Kokintz

William Hartnell

as Will Buckley

David Kossoff

as Professor Alfred Kokintz

Leo McKern

as Benter

MacDonald Parke

as General Snippet

Austin Willis

as United States Secretary of Defense

Timothy Bateson

as Roger

Monte Landis

as Cobbley

Alan Gifford

as Air Raid Warden

Colin Gordon

as BBC Announcer

Harold Kasket

as Pedro

Guy Deghy

as Soviet Ambassador (uncredited)

Eve Eden

as Spectator (uncredited)

Bill Edwards

as Army Captain (uncredited)