England is at war with Spain. The Royal Navy is desperate for more recruits, so it's having to take on some less than able seamen! Take Albert Poop-Decker (Bernard Cribbins) for example. Poop-Decker has spent eight and a half years at the British Naval Acadamy, and has still not managed to 'pass out'. but he has, at least, succeeded in making his superiors feel a little queasy - especially since the urgency of England's war footing means the ponderous Poop-Decker has to be dispatched immediately into active service.
- Kenneth Williams as Captain Fearless
- Bernard Cribbins as Midshipman Albert Poop-Decker
- Juliet Mills as Sally
- Charles Hawtrey as Walter Sweetly
- Donald Houston as First Officer Jonathan Howett
- Percy Herbert as Mr. Angel, the Bos'un
- Jim Dale as Young Carrier
- Patrick Cargill as Don Luis, the Spanish Governor
- Cecil Parker as First Sealord
- Ed Devereaux as Hook (Pirate)
- Peter Gilmore as Patch (Pirate Captain), aka Roger
- George Woodbridge as Ned
- Ian Wilson as Ancient Carrier
- Jimmy Thompson as Adm. Horatio Nelson
- Anton Rodgers as Hardy
- Michael Nightingale as Town Crier
- Frank Forsyth as Second Sealord
- Barrie Gosney as Coach Driver
- John Brooking as Third Sealord
- Jan Muzurus as Spanish Captain
- Vivienne Ventura as Spanish Secretary (as Vivian Ventura)
- Marianne Stone as Peg
- Originally conceived as 'Up The Armada'. As that title didn't find favor with the British Board of Film Censors, the film was known during pre-production as 'Carry On Sailor'.
- The script included a note which stated that Any relationship between this story and historical fact is purely accidental (fact has been purposely avoided).
- The film used reconstructed ships and props left over from filming of the 1962 film HMS Defiant.
- First Carry On... film made in costume and with a historical setting.[N 1]
- Talbot Rothwell's first screenplay for the series. He would go on to write 20 of them.
- Liz Fraser was originally cast in the part of Sally.
- This entry in the series featured the lowest number of "Carry On..." regulars, with only three appearing: Kenneth Williams, Charles Hawtrey and Jim Dale.
- Kenneth Cope was considered for the role of Albert Poop-Decker.