Able seaman Poop-Decker signs up for adventure on the high seas with the wicked Captain Fearless. Those swabbing the decks include Juliet Mills, Charles Hawtrey and Donald Houston. The film was originally to be titled Up the Armada, but the British Board of Film Censors objected to such a rude title.

Kenneth Williamsas Captain Fearless
Bernard Cribbinsas Midshipman Albert Poop-Decker
Juliet Millsas Sally
Charles Hawtreyas Walter Sweetley
Donald Houstonas Lieutenant Jonathan Howett
Percy Herbertas Mr. Angel
Jim Daleas Young Carrier
Patrick Cargillas Governor Don Luis
Cecil Parkeras First Sea Lord
Ed Devereauxas Hook
Alan Hume