The Mouse That Roared

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