One Piece Movie 03: Chinjuu-jima no Chopper Oukoku

The Straw Hats reach Crown Island, a strange place where animals can speak. A sudden accident separates Chopper from the crew, and the island's residents mistake the young reindeer for the new king foretold by their traditions. Chopper is bewildered by the honor, but quickly grows protective of his unusual new friends.

The peace is threatened by hunters searching for legendary animal horns said to grant overwhelming power. Luffy and the others race to reunite with Chopper and protect the island, while Chopper must decide whether being treated as a king means standing up for the creatures who have placed their trust in him.