- Davy Kaye - Admiral
- Alexander Doré - First Spy
- Bernard Spear - Second Spy
- Stanley Unwin - Chancellor
- Peter Arne - Captain of Guard
- Heather Ripley - Jemima Potts
- Adrian Hall - Jeremy Potts
- Desmond Llewelyn - George Coggins
- Victor Maddern - Junkman
- Arthur Mullard - Cyril, Big Man
- Ross Parker - Chef
- Gerald Campion - Minister
- Felix Felton - Minister
- Monti DeLyle - Minister
- Totti Truman Taylor - Duchess
- Larry Taylor - Lieutenant
- Max Bacon - Orchestra Leader
- Max Wall - Inventor
- John Heawood - Inventor
- Michael Darbyshire - Inventor
- Kenneth Waller - Inventor
- Gerald Taylor - Inventor
- Eddie Davis - Inventor
- Richard Wattis - Secretary at Sweet Factory (Uncredited)
- Phil Collins - Vulgarian Teen
- Robert Arditti - Dancer (uncredited)
- Vic Armstrong - Cavalry Guard at Cannon (uncredited)
- Michael Audreson - Peter (uncredited)
- Theo Aygar - 4th Minister (uncredited)
- John Baskcomb - Castle Chef (uncredited)
- Roy Beck - Grand Prix Spectator (uncredited)
- Jimmy Berriman - Child in Castle (uncredited)
- Eunice Black - Courtier (uncredited)
- Bill Brandon - 'Test your Strength' Attendant (uncredited)
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Greg McLeod, Myles McLeod
Capítulo disponible en las siguientes plataformas:
