Episode 584 - Luffy's Final Showdown! The Struggle for the Pirate King's Crown

Episode 584
Luffy’s Ultimate Battle! The Fight for the Pirate King’s Throne
Japanese: ルフィの究極の戦い！海賊王の座をかけた戦い
Rufi no Kyūkyoku no Tatakai! Kaizoku-Ō no Za o Kaketa Tatakai

The Straw Hat Pirates encounter an island that holds one of the final pieces of the treasure map. However, the island is home to a powerful ruler who controls a deadly army of creatures. The crew must battle through the island’s defenses to retrieve the map piece while avoiding the deadly creatures protecting the island.