Episode 674 - The Supreme Challenge! Luffy's Struggle for the Pirate Emperor's Dominion

Episode 674
The Ultimate Test! Luffy’s Battle for the Pirate King’s Throne
Japanese: 究極の試練！ルフィの海賊王の座をかけた戦い
Kyūkyoku no Shiren! Rufi no Kaizoku-Ō no Za o Kaketa Tatakai

As the final confrontation begins, the Straw Hat Pirates learn that the secret weapon is an ancient machine capable of massive destruction. Luffy and his crew fight against the World Government's forces while trying to prevent the machine from being activated. With time running out, the crew must rely on their strength and unity to overcome the overwhelming odds.