Episode 503 - The First Challenge! Luffy’s New Fight Against the Pirates

Episode 503
The First Challenge! Luffy’s New Fight Against the Pirates
Japanese: 初めての挑戦！ルフィの新たな海賊との戦い
Hajimete no Chōsen! Rufi no Aratana Kaizoku to no Tatakai

The Straw Hat Pirates form an alliance with the island’s inhabitants to take down the rogue pirates exploiting the island’s weather. During the battle, the crew learns about the island's connection to an ancient prophecy. As they defeat the pirates, Luffy uncovers a clue about their next destination, leading them toward a powerful treasure.