When plucky penguin Pororo and his animal pals decide to be the world's greatest pirates, they discover a treasure map that brings them to a remote tropical island. There they meet marooned Captain Silver, who teaches them how to be good swashbucklers, but nasty Captain Dark shows up. too, and wants the riches for himself. To claim the gold guarded by the fierce sea monster Kraken, they must solve a series of magical puzzles. But how can they escape...

While playing on the beach, Sheep, Duck, and Shark find a message in a bottle. The note contains a rhyming clue that will lead them straight to a special treasure! The trio rhyme their way across the sea as they follow the clues, but it would be a lot easier if they only had a ship!