Episode 603 - The Ultimate Test for the Straw Hat Crew! Luffy's Fight for Tomorrow

Episode 603
The Straw Hat Pirates’ Greatest Challenge! Luffy's Battle for the Future
Japanese: 麦わらの一味の最大の挑戦！ルフィの未来をかけた戦い
Mugiwara no Ichimi no Saidai no Chōsen! Rufi no Mirai o Kaketa Tatakai

The crew is taken captive by the New Age Pirates, who plan to use them as leverage to force the Straw Hats into joining their ranks. Luffy and his crew refuse, and they begin to work on a plan to escape. Meanwhile, the true intentions of the New Age Pirates are revealed—they intend to locate a powerful ancient weapon that could bring the Grand Line under their control.