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The King of the Fish-Man Island! Neptune, the God of the Sea!

The episode starts with Gyro escaping from Hody Jones who in turn goes after him. The Straw Hat Pirates are in a town on Fishman Island and King Neptune and Megalo appear to invite the Straw Hats to Ryugu Palace. Hody destroys Gyro's ship with handcuffs on to show how powerful he is. He defeated them all but left them still conscious so that they can tell about what is happening under sea to the people on earth.
Aired: Jan 08, 2012 Genre: Action & Adventure Comedy AnimationCasts: Mayumi Tanaka Kazuya Nakai Akemi Okamura Kappei Yamaguchi Hiroaki Hirata Ikue Otani Yuriko Yamaguchi Mahito OhbaDuration: 24m Rating: 4.5 Country: Japan Production: Toei Animation, Fuji Television Network, Avex Trax, Shueisha, Asatsu-DK
Episodes
523: A Suprising Fact! The Man Who Guarded the Sunny!524: Deadly Combat under the Sea! The Demon of the Ocean Strikes!525: Lost in the Deep Sea! The Straw Hats Get Separated!526: Undersea Volcanic Eruption! Drifting to the Fish-Man Island!527: Landing at the Fish-Man Island! Beautiful Mermaids!528: Excitement Blow-out! Sanji's Life Under Threat!529: The Fish-Man Island Will Be Annihilated?! Sharley's Prophecy!530: The King of the Fish-Man Island! Neptune, the God of the Sea!531: Ryugu Palace! Taken by the Shark that They Saved!532: A Coward and a Crybaby! The Princess in the Hard Shell Tower!533: It's An Emergency! The Ryugu Palace Is Occupied!534: It's The Ryugu Palace in Shock! The Kidnapping Of Shirahoshi!535: Hordy's Onslaught! The Retaliatory Plan Set Into Motion!536: The Ryugu Palace fight! Zoro vs Hordy!537: Keep Shirahoshi Safe! Decken Close Behind!538: The Straw Hats Defeated!? Hordy Gains Control of the Ryugu Palace!539: The Haunting Ties! Nami And The Fish-Man Pirates! The Resurrected Destiny! Nami and the Fishman Pirate Crew!540: A Hero Who Freed The Slaves! An Adventurer Tiger!541: Kizaru Appears! A Trap To Catch Tiger!542: A Team is Formed! Save Chopper543: The Death of the Hero! A Shocking Truth of Tiger!544: The Sun Pirates Split! Jimbei vs. Arlong!545: Shaking Fish-Man Island! A Celestial Dragon Drifts In!546: A Sudden Tragedy! A Gunshot Shuts Down the Future!547: Back to the Present! Hordy Makes a Move!548: The Kingdom in Shock! An Order to Execute Neptune Issued!549: A Rift Opens Up! Luffy vs. Jimbei!550: Something Has Happened to Hordy! The True Power of the Evil Drug!551: The Battle is on! At Conchcorde Plaza!552: Surprising Confession! The Truth Behind the Assassination of Otohime!553: Shirahoshi's Tears! Luffy Finally Shows Up!554: A Great Clash! The Straw Hat Crew vs. 100,000 Enemies555: Deadly Attacks One After Another! Zoro and Sanji Join The Battle!556: Unveiled! The Secret Weapons of the Sunny!557: Iron Pirates! General Franky Appears558: Noah Approaches! The Crisis of Fishman Island's Destruction!559: Hurry Up, Luffy! Shirahoshi's Desperate Situation560: The Battle Begins! Luffy Vs. Hordy!561: A Massive Confused Fight! The Straw Hats vs. The New Fish-Man Pirates!562: Luffy Loses the Fight?! Hordy's Long Awaited Revenge!563: A Shocking Fact! The True Identity of Hordy!564: Back to Zero! Ernest Wishes for Luffy!565: Luffy's All-out Attack! Red Hawk Blasts!566: Coming to an End! The Final Decisive Battle Against Hordy567: Stop, Noah! Desperate Elephant Gantling!568: To the Future! The Path to the Sun!569: The Secret Revealed! The Truth About the Ancient Weapon!570: The Straw Hats Stunned! The New Fleet Admiral of the Navy!571: She Loves Sweets! Big Mom of the Four Emperors!572: Many Problems Lie Ahead! A Trap Awaiting in the New World!573: Finally Time to Go! Goodbye, Fish-Man Island!574: To the New World! Heading for the Ultimate Sea!575: Z's Ambition! Lily the Little Giant!576: Z's Ambition! A Dark and Powerful Army!577: Z's Ambition! A Great and Desperate Escape Plan!578: Z's Ambition! Luffy vs. Shuzo!579: Arriving! A Burning Island - Punk Hazard!580: A Battle in the Heat! Luffy vs. The Giant Dragon!