Landing! The Burning Island, Punk Hazard

The Straw Hats have arrived at a volcanic island that does not show on the New World Log Pose. Luffy in his enthusiasm votes to go to the island, though most of his crew are reluctant to go. The crew than receives a distress call from someone on the island who is being attacked by a samurai. They then draw sticks on who will go with Luffy and who will stay on the ship, with Zoro, Robin and Usopp coming with Luffy. With the help of Nami's clouds, the scouting group arrive at the main entrance which Zoro cuts down with ease. The group wanders the area seeing the whole place being constantly on fire and wondering what happened here. Their exploration is suddenly cut short when they encounter a Dragon looking hungrily at them.
At Raijin Island, Smoker and Tashigi intercept the distress call that Luffy picked up and order the G-5 Marines to set a course for Punk Hazard

A Scorching Battle! Luffy vs. the Giant Dragon!

Luffy and Zoro starts fighting the dragon, which is shown to be able to speak and breathe fire. Luffy rockets up to the dragon's back, discovering the presence of a pair of legs. Luffy manages to make the dragon chew its own wing, making it fall. Zoro takes the opportunity to jump into the air with Usopp's trampolina and decapitates the dragon.
Meanwhile, Nami, Chopper, Franky, Brook, and Sanji are all asleep due to a sleeping gas and are abducted by men in hazmat suits.

The Crew is Confused! The Shocking Beheaded Samurai Appears!

Luffy, Zoro, Usopp, and Robin are standing near the dead dragon that Zoro killed and Luffy is trying to pull out the man who is stuck in the dragon's body. Luffy succeeds by pulling out only the legs, making everyone think that he killed the man. However, the legs are alive and they run away trying to look for a Shichibukai. Luffy runs after him and gets stuck to the legs after the legs fall on top of him.
Elsewhere, the Straw Hats who were captured by the people in the hazmat suits (Sanji, Nami, Chopper, and Franky) are in a prison cell and were shown to a gaseous figure known as "Master" who is very interested in Franky. They wake up minutes later in a cell and try to figure out how to get out. They then see a man's head which was cut into pieces and put it together. The head is alive and it tells them that his body was cut into pieces by a Shichibukai and he feels shameful for not getting killed after getting sliced.
Back with Luffy's group, Usopp sees a harpy girl on top of a burned down building, but after he yells for everyone to look, she disappears suddenly. They then approach a lake that separates the fiery and icy halves of Punk Hazard. Luffy befriends a centaur that thought that Luffy was one of his kind. The people of Punk Hazard who work for Master see Luffy's group and tell the harpy girl about them.

Shock ! The Secret of the Island is Finally Revealed !

Franky, Sanji, Nami and Chopper are surprised that the samurai is still alive after being cut. He is surprised that Nami talks in such a direct manner and dresses in revealing outfits but says that he likes it. He then finds out that they are pirates and says that he doesn't want to go with them because he hates pirates. He says that the reason he went to the island was to find his son Franky then blasts a hole in the wall using his Radical Beam and they escape, running into a room filled with giant children.
Luffy races against the centaur he befriended. Usopp contacts Brook and Brook tells him that Nami, Sanji, Franky, and Chopper were captured. The centaur gets a call from his comrades and they tell him that Luffy is the enemy. Luffy beats him up and Robin handles the other centaur that comes to help. The Straw Hats notice that the Den Den Mushi the centaurs were using had CC written on it.
The Master gets news that the Straw Hats escaped and that one of them can shoot laser beams like the Pacifistas. He also learns that they are in the biscuits room with the giant kids. He also finds out that the Marines are arriving and tells his men to send out poison gas to stop them from landing. The G-5 men start suffocating from the gas so they put on gas masks. Smoker then explains that the island was the battleground for Aokiji and Akainu when they fought for for the title of Fleet Admiral two years ago.

Save the Children! Gang Fight Starts!

Nami's group who escaped the prison cell end up in the Biscuits Room, where they find giant children. The children play with Chopper and Franky for a moment, but are scared when the samurai head asks if they have seen a boy named Momonosuke. The hazmat suit soldiers arrive and attempt to capture Nami's group, and the pirates run away. Meanwhile, Usopp makes a banana boat so Luffy's group can get across from the fire side of Punk Hazard to the snow side of the island. The centaur who Luffy beat earlier sees them, and tells his boss that the Straw Hats are heading to the snow part of Punk Hazard.
Back to the mysterious facility, Nami's group decide to stay and save the children, and defeat the hazmat suit soldiers. Meanwhile, on the frozen side of the island Brook is building snowmen and is suddenly attacked by the samurai's torso just after his snowmen are complete.