One Piece Film Z

Zephyr, now known as Z, rides the seas with only one goal: Destroy all pirates and their dreams at becoming King of Pirates. When Luffy and his crew encounter him at sea, they are utterly defeated by the man with an arm made of Seastone, turning Nami, Robin, and Chopper 10 years younger due to Ain's minion powers. Zephyr is determined to win against Luffy, even if it means sacrificing thousands of lives.