The plot's simpler than the one in the book. The Pirate Captain wants to be "Pirate of the Year," even though he hardly has a chance against the really great pirates. After all, he's barely a midlist pirate. By chance he meets up with Charles Darwin, who discovers that the Pirate Captain's parrot is actually a dodo. Darwin suggests the possibility of great reward for the scientific discovery. Hilarity ensues. Or it did for me if not for the majority of movie critics. Favorite line: "You can't make everything all right just by saying 'arrrr' at the end of a sentence."
You know you can't trust my opinion about movies, especially pirate movies. After all, I liked Cutthroat Island. Let the viewer beware.