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, not only are they utterly defeated by the man with an arm made of Seastone, Nami, Robin, and Chopper are turned 10 years younger due to Z's minion Ain. Luffy is so determined to win against him that he does not even notice Z's master plan that could sacrifice thousands of lives.

平静明媚的一天，大海上突然传来路飞（田中真弓 配音）撕心裂肺的哀号，原来在他睡觉的时候，他最最钟爱的那顶草帽竟然不翼而飞。了解到草帽的重要意义，草帽海贼团的伙伴们齐心协力帮他寻找。在这一过程中，乔巴等人还救助了一个奄奄一息的老海贼（山口智充 配音）。不久，众人发现一只奇怪的秃鹫叼着路飞的草帽在空中盘旋，于是众人从天上到海上展开了一场大追逐。与此同时，海军也集结了最强大的力量围捕草帽海贼团。为了一顶草帽，空前绝后的战争由此上演…… 本片为漫画家尾田荣一郎原著《海贼王》第11部剧场版动画，首次采用3D制作，与3D版《美味猎人》同时公映。

在大海贼时代拉开序幕的三年前，金狮子史基率领的海贼大舰队强悍无比，他妄图称霸世界。但在这之前，哥鲁德•罗杰仍是其最后的障碍。罗杰掌握足以毁灭世界的终极武器的秘密，他拒绝成为史基的下属，双方发生著名的艾德•沃海大战。原本处于劣势的罗杰被突如其来的大浪所救，双方战成平手。两年后，罗杰成为公认的海贼王，但不久便传来他被海军抓获的消息。史基愤愤不平，大开杀戒，却落败被投入海底监狱。不久，罗杰问斩，他所留下的秘宝遗言却由此开启了大海贼时代的序幕…… 本片根据尾田荣一郎特别创作的漫画改编，是《海贼王》第十部剧场版“强者世界”的前传。

Monkey D. Luffy meets the Red Hair Pirates as a young boy living in East Blue, swearing becoming the next Pirate King. 10 years later, Luffy sets sail and experiences first adventures, recruiting the first members of the Straw Hat Pirates.