Sequel to "The Mouse that Roared." The tiny country of Grand Fenwick faces a hot water crisis in the castle. To fund new plumbing, they cleverly request foreign aid from the U.S. under the pretense of space research. The USSR responds with aid of its own, eager to prove its support for the internationalization of space. While the Grand Duke dreams of hot baths, the nation's lone scientist hurriedly assembles a rocket. News of the impending launch causes both the U.S. and Soviets to rush to beat Grand Fenwick to the moon. Cast: - Margaret Rutherford as Grand Duchess Gloriana XIII - Ron Moody as Prime Minister Rupert Mountjoy - Bernard Cribbins as Vincent Mountjoy - David Kossoff as Professor Kokintz - Terry-Thomas as Maurice Spender (as Terry Thomas) - June Ritchie as Cynthia, Mountjoy's protester niece and Vincent's love interest - John Le Mesurier as British delegate - John Phillips as Bracewell, the American delegate - Eric Barker as MI5 man - Roddy McMillan as Benter - Tom Aldredge as Wendover - Michael Trubshawe as British aide - Peter Sallis as Russian delegate - Clive Dunn as Bandleader - Hugh Lloyd as Plumber - Graham Stark as Standard Bearer - Mario Fabrizi as Mario, the Valet - Jan Conrad as Russian Aide - John Bluthal as Von Neidel - Archie Duncan as USAF General - Guy Deghy as Russian Scientist - Richard Marner as Russian Air Force General - Allan Cuthbertson as Member of Whitehall Conference - Robin Bailey as Member of Whitehall Conference - John Wood as Countryman Runtime: 100 minutes.