''Carry On Jack'' starts with Battle of Trafalgar of Horatio Nelson (Jimmy Thompson (actor)), whose last words are that Britain needs a bigger navy with more men, followed by his famous request for a kiss to Hardy (Anton Rodgers). In the main story, Albert Poop-Decker (Bernard Cribbins) has taken 8 years and still not qualified as midshipman, but is promoted by the First Sea Lord (Cecil Parker) as England needs officers. He is to join the frigate ''Venus'' at Plymouth. Arriving to find the crew all celebrating as they are sailing tomorrow, he takes a sedan chair with no bottom (so he has to run), carried by a young man and his father (Jim Dale and Ian Wilson (actor), respectively) to ''Dirty Dick's'' Tavern.