The two elves Julia and Nisse are on a mission for Santa Claus at the local school when they become friends with Bella, whose mother hates Christmas more than anything. In an attempt to make the mother change her mind they decide to all go on a Christmas cruise. What they don't know is that the organizer of the cruise is the evil Captain Morgan and her crew of pirates, and that the whole thing is a setup to gain more prisoners for her ship Svarta Ankan (The Black Duck) and impress the other pirate captains.