Episodes 554 through 568.
Related episodes:
1, 554 episodes:
Under Jinping's plan, the Straw Hat Pirates arrive at Gironde Calder Plaza with all their members, and successfully save Neptune and others, but Hoddy, who boasts that he will become the King of Pirates, lets the new Fishman Pirates, who have an overwhelming numerical advantage, attack Luffy and others. The fate of Fishman Island is about to be decided, with just ten people facing off against an army of 100,000, but at that moment, Luffy unleashes his overpowering aura and instantly knocks out half of his enemies
2, Episode 568:
The Fishman Island is finally saved, but Luffy, who has been constantly battling for this cause, is covered in injuries and is in a very critical state. However, the people of Fishman Island, affected by the shadow of the past, are hesitant to save him. Just when everyone thought that Luffy's life was coming to an end, one man's action changed history: Jie Ping, who had been helping Luffy along the way. Jinpei's actions finally brought Fishman Island back to zero.
Expanded Information
Related Background:
Fishman Island, located 10,000 meters under the sea in the Holy Land of Marijoa, is the necessary place to arrive at the New World, and is the birthplace of most of the Fishmen and Mermaids, and is also known as the "Undersea Land". It is also the birthplace of most of the fish and mermaids, and is also known as the "Underwater Paradise".
To get here, ships usually have to membrane their hulls in the Chambord Islands and navigate the currents to get there safely. The inhabitants of the island are mainly mermaids and ermen, and the ancient weapon "Poseidon" is a mermaid princess that appears only once in hundreds of years, and the oath boat "Noah" also sleeps here.
With Luffy's efforts, peace was restored to Dragon Palace City. Just as Luffy and his group were about to escape, Neptune sent soldiers to stop them. It turned out that Neptune had decided to thank the Straw Hat Pirates by organizing a grand banquet for them, featuring singing girls and dancing mermaids.
Baidu Encyclopedia - King of Thieves