The Carry On gang strikes again - this time in the bold, brave days of the Armada, a time when countries were judged by their strength at sea, and men by their naval heroism! The not-so-courageous Captain Fearless is in command of the good ship 'Venus', sailing to the Spanish Main to vanquish the foe and earn the glory that makes Britain a proud nation. But the bumbling captain soon becomes a burden to his lusty crew and a plot is hatched to make him desert the ship of his own free will.