One Piece season 16

The Straw Hats arrive at a volcanic island that does not appear 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 with him. 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 arrives at the main entrance which Zoro cuts down with ease. The group wanders the area seeing the whole place on fire, wondering what happened to the island. 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.

Luffy and Zoro start fighting the dragon, which can speak and breathe fire. Luffy rockets up to the dragon's back, discovering a pair of legs. Luffy gets the dragon to chew its own wing, making it fall. Zoro takes the opportunity to jump into the air with Usopp's trampoline and decapitates the dragon. Meanwhile, Nami, Chopper, Franky, Brook, and Sanji all fall asleep due to sleeping gas and get abducted by men in hazmat suits.

Luffy, Zoro, Usopp, and Robin stand near the dead dragon that Zoro killed, with Luffy trying to pull out the man who is stuck in the dragon's back. 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 Warlord. Luffy runs after him and gets stuck to the legs after they fall on top of him. Elsewhere, the captured Straw Hats (Sanji, Nami, Chopper, and Franky) are in a prison cell and are shown to a gaseous figure known as "Master" who is very interested in Franky. They wake up minutes later in the 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 Warlord, 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. 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.

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, much to Sanji's chagrin. He then finds out that they're pirates and says he doesn't want to go with them because he hates pirates. He says that the reason he went to the island is 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, who 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 Transponder Snails 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 biscuit 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 the title of Fleet Admiral two years ago.

The Straw Hats who escaped the prison cell end up in the Biscuit Room where they find a group of children. The samurai head scares the children. The hazmat suit guys arrive and attempt to capture the Straw Hats. Meanwhile, in Luffy's group, Usopp makes a banana boat so they can cross the river to the frozen side of Punk Hazard. Then, the centaur whom Luffy beat earlier tells his boss that the Straw Hats are heading to the frozen side of Punk Hazard. Back in Nami's group, the children beg the Straw Hats to save them as they have been on the island for over a year and want to go home. Nami's unwillingness to abandon them convinces the others to rescue them as they fight off the hazmat suit guys.

The G-5 marines attempt to reach the snow side of Punk Hazard and shoot the ice blocks with cannons to make a path. Luffy, Zoro, Usopp and Robin see the centaurs and Brownbeard and they attempt to attack the Straw Hats. Chopper is fighting off the hazmat suit guys who attempt to get in his, Nami and the children's way. Sanji and Franky continue to fight off the hazmat suit guys and find out that they look like sheep. Brook is fighting off against the samurai's torso and gets scared when he doesn't talk back to him and uses two sword style against Brook. Brook then runs away. One of the hazmat suit guys warns the master that G-5 is almost at shore, who says he doesn't want to handle them. Trafalgar Law, who is with the master, says he will handle them. G-5 finally reach the shore and Smoker rings the doorbell to Vegapunk's lab room. Law opens the doors, and the G-5 marines see him and get scared. Tashigi claims he is now a Warlord because he gave the World Government 100 pirate hearts so he can join their ranks. Smoker says Law is not allowed to be at Punk Hazard even though he is a Warlord. Law replies that Smoker and the marines are not allowed there either.

Chopper and Nami try to escape with the children until they come across a door that Chopper breaks open. They step inside a cold room with frozen people. Meanwhile, Sanji and Franky beat up all the hazmat suit guys and Sanji wants to kill the samurai because he taunts his merciful behaviour. They then try to catch up with the children, Nami and Chopper. Brownbeard and the centaurs attempt to kill Luffy, Zoro, Usopp and Robin but Zoro cuts their cannons while Luffy deflects the rest. Brownbeard tells the centaurs to aim for the water to sink the straw hats but they paddle to safety. Brook runs away from the samurai's torso and sees it get caught in a big snowball, which starts to roll downhill towards the lake. Smoker and Tashigi play a transmission from earlier between luffy and the centaur, in which the latter states he's at Punk Hazard. Law claims that the message didn't come from there and the marines tend to forge messages and transmissions to catch pirates and wanted people. Sanji, Nami, Franky, Chopper and the children arrive outside and see Law, Smoker, Tashigi and G-5. Sanji then orders them to run away. Chopper and Nami think that Law is behind the children's imprisonment. Tashigi orders G-5 to go after the straw hats. Law states he won't allow the marines to escape and lifts the marine's ship with his devil fruit ability; room tact. Law and Smoker then prepare to fight, while Smoker tells his men they cannot handle Law because of his devil fruit.

Luffy, Zoro, Usopp and Robin try to get to the frozen side of Punk Hazard, but their ship gets capsized by Brownbeard. As Brownbeard's troops prepare to attack them again, Zoro gets ready to destroy their bullets, but gets dragged down by sharks. At the last second, Brook saves Zoro and defeats Brownbeard's shooters. Once Luffy and the gang get out of the freezing water after killing the sharks, they opt to take the centaur's warm coats. Having realized that the Straw Hats are fighting them, Brownbeard orders an immediate retreat, only to be stopped by Luffy, Zoro, and Robin. Meanwhile, the other Straw Hats attempt to go back into the building to find another escape route, but their "hearts" get switched by Law making them swap bodies: Franky in Chopper's, Chopper in Sanji's, Nami in Franky's and Sanji in Nami's, with Sanji overjoyed to have big breasts. Law then returns his attention to the marines and destroys their ship. The G-5 marines attempt to contact marine headquarters about Law, but he takes away all their Transponder Snails. Smoker then fights Law and warns his men to stay back from the fight to not get cut to pieces (which they do) by Law's Op-Op Fruit powers. Feeling useless in the situation, Tashigi attempts to strike the Warlord but is promptly bisected.

Feeling dishonoured by still being alive, Tashigi tells Law to kill her but he says she does not have the right to tell him when or how she can die, and she tries to attack him with her broken sword. She misses and Law prepares to slice her again before Smoker steps in and fights Law. Meanwhile, the beaten centaurs talk about how they underestimated the Straw Hats, who took Brownbeard with them. While they contemplate on that, Luffy's group ride Brownbeard to the mysterious building that Brook saw. In the lab, a hazmat guy tells the mysterious smoke man that Law and Smoker are in a fight, the children escaped with Nami's group, and that Smoker saw the children. The smoke man becomes angry but says that if he tries to kill Smoker, the navy would get suspicious. Just then, the Harpy that Usopp saw, Monet, informs the smoke man that they captured Straw Hats pirates and that Luffy's group beat Vegapunk's dragon and the centaurs and are on their way to the facility. The smoke man finally decides to kill the Straw Hats and G-5, although he knows the navy could be alerted. He then tells Monet to call Joker. Back with Sanji's group, the children begin to realize that Nami, Sanji, Chopper, and Franky switched bodies. They also start to get cold. Sanji states that he does not care about anyone anymore and asks if someone has a camera so he can take a picture of himself in Nami's body. When a child falls and complains that it is cold, Franky begins to say that it was a bad idea to bring the kids if they did not have a plan. Back at the main entrance to the facility, Smoker and Law are still fighting as the G-5 are watching and putting themselves back together outside Law's bubble. As the fighting continues, the G-5 try to figure out why Law is fighting them even though he is a warlord. Tashigi tries to fight but the G-5 stop her. She then reflects on what Smoker told her two years ago: "Pirates will be pirates." Closing in on the fight, Law's recoils cut up everything in the way. Smoker then begins to ask him why he was on the island, with Law saying nothing. Back to Tashigi, she begins to remember what Smoker said after the incident at Enies lobby. She remembers him saying that they have to be promoted and that he would kick the asses of the Straw Hats in the New World. In the fight, Smoker tells Law that he never trusted the Warlords and as Smoker charges at him, Law says under his breath, "Maybe that's the right thing to do," and begins to make stone spikes rise from the ground in Smoker's direction to get him. Although Smoker dodges most of them, Law rises one from under him and Smoker gets jabbed. As he drops his jitte, Smoker once again asks why Law is on the island and the two begin to fight again. Law finally answers the question by asking why the G-5 are here. Law pushes Smoker back and Smoker tries to jab Law but instead breaks through a stone spike that Law rose from the ground. As he ducks from the attack, Law tell Smoker that from his current standing he could not see a few things and poked out his heart. Law takes the heart and his sword and says that he does not have to say anything to Smoker. With his heart outside of his body, Smoker collapses.

Tashigi tries to see what happened in the fight. Luffy's group sees the flying warship. Luffy sees Law and says thanks for saving him two years ago. Law says that they aren't friends and Luffy agrees since they were both after One Piece. Law remembers the past between him and Luffy when Law saved him at Marineford. Luffy sees Smoker on the ground. Tashigi cries over Smoker's body and attempts to kill Law but he switches their hearts. Meanwhile, the kids from the lab complain about the cold so the samurai uses his devil fruit to give the kids and the Straw Hats warm clothes. Luffy's group then meets up with the other group behind the lab. While going over what happened Robin reveals that Law became a Warlord two years ago and the samurai reveals that Law is the one who cut him in thirds and reunites with his legs. Law meets up with Caesar Clown who Smoker speculates was behind everything on the island.

The G-5 marines discuss that Caesar Clown is probably behind the Island and that the child abduction case in that area could be true. Caesar is dealing with a patient that he says needs to be healed but he sends him to the gas chambers. Brownbeard is tied up and tells Luffy and his crew that the Eleven Supernovas (which Luffy, Zoro and Law are a part of), and Blackbeard are now referred to as the Worst Generation and that Caesar and Law saved him and his men from dying from the poisonous gas and was given the ability to walk again. Smoker tells his men that Caesar was behind the failed experiment and not Vegapunk. Caesar kills his patient with poisonous gas and plans on being the best scientist the world has ever known to surpass Vegapunk himself.

Celebrating Mr. Satan's victory at the IGO tournament, the group discovers that the tournament was planned with the ulterior motive of gathering the world's strongest fighters to capture the legendary Deep Sea Glutton creature Akami, which has the ability to suck the energy out of living things. The Akami appears and attacks Mr. Satan, Usopp and Gohan, poisoning them and absorbing their energy, before disappearing again; This leaves the group with only 30 minutes to find Akami and create an antidote to its poison. After defeating Sanji, Piccolo, Franky, Gotenks and others, Akami evolves into an even more powerful monster, even gaining the ability to absorb and use the power of energy attacks intended to stop it. Luffy and Toriko distract the monster while Goku charges a Spirit Bomb using the energy from everyone at the tournament. This attack, along with a simultaneous finishing move from all three combatants, defeats Akami, and the group resumes their banquet. Neither Zoro, Zebra or Vegeta participate, as they have been fighting each other since the tournament began.

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Note: This episode is a crossover with Toriko and Dragon Ball Z which continues from Episode 99 of Toriko. Due to licensing restrictions, Funimation skipped this episode in every official release until March 2023.

The children and Straw Hats are in a cave with Brownbeard tied up talking about the Master. Zoro, Sanji and Brook go to look for the samurai, who had gone to look for his torso. The children then start to fall over in pain while asking for candy. Chopper, who tested them for any sickness, reveals that they were drugged and are suffering from withdrawal. They attack the Straw Hats, who can't fight back without injuring the children, so Usopp puts them to sleep. Back in the lab, Law gives Smoker's heart to Caesar, who sent the Yeti Cool Brothers to deal with the Straw Hats. The Brothers are then shown talking to each other while Zoro, Sanji and Brook lie unconscious nearby.

The Yeti Cool Brothers make their way to the destroyed lab where the Straw Hats and the children are. Monet tells Caesar about Law having some relationship with Luffy, which makes Caesar mistrust Law until Law give reassurance. The Yeti Cool Brothers attack the cave and shoot Brownbeard and then take Nami. Luffy arrives and attempts to rescue her but fails. Law is challenged by two of Caesar's men as he leaves and attacks them.

Chopper tells the others that Nami was kidnapped by the Yeti Cool Brothers. Luffy and Franky go after them, but Franky (in Chopper's body) goes against Chopper's warnings and takes a rumble ball, going on a rampage and chasing Luffy. Meanwhile, Caesar notices Vegapunk's beam in Franky's body and craves for it, he calls his men so they go to the fire side gate and see a cave. After Luffy nearly falls into a trap he faces the Yeti Cool Brothers when Franky ending up beating one of them before his rampaging forces Luffy to knock him out. The second brother tries to escape with Nami before Law appears and defeats him. Law then proposes an alliance to take down an Emperor to survive in the New World.

Luffy and Law agree on an alliance; the rest of the Straw Hats disapprove while Robin approves, even if she warns Luffy about a possible betrayal in a pirate alliance. Law returns Franky and Chopper back to their bodies while Nami ends up in Sanji's body because Sanji is far away with Zoro and Brook. Law tells them that they can't go back once things start moving for example capturing Caesar Clown who has the Gas-Gas Fruit. He warns them that he is highly dangerous therefore, they need Haki users to beat him. Luffy says that the Haki users there are him, Law, Zoro and Sanji. The marines are continuing their fight against Caesar's men. The three centaurs open the door and see a big glop of Slime that seeps out poison gas, most of them die and two survive so they run as it chases them. Caesar calls the pet slime monster Smiley and says that the Straw Hats and the G-5 marines are being used as test subjects for it.

Zoro, Brook and Sanji are trying to find the samurai. Earlier they got knocked out by the Yeti Cool Brothers. Caesar's hazmat subordinates attack them but fail. They find the samurai's head and legs frozen and unfreeze him. They see Smiley far away. Smiley is a chemical experiment that caused the explosion in Punk Hazard. Law and Chopper are heading to the lab. Caesar drugged his test subjects to experiment on them. G-5 Marines attempt to break inside lab and then Luffy, Franky and Robin arrive out of nowhere surprising the Marines and Caesar's subordinates.

Luffy declares that he will capture Caesar. Law says he will deal with Monet while Chopper tries to find an antidote. Luffy and his group try to find the entrance to lab. Tashigi and Smoker attack Luffy, with Smoker gaining an advantage until Luffy uses Gear Second and tells Smoker to fight him later when he is at full strength. Back in the lab, the children start to wake up until Usopp puts them to sleep again. They then see pieces of Smiley falling onto the stolen warship. Franky, not being able to find an entrance, uses his Radical Beam to make an opening. The Marines try attacking it but discover that it emits poison gas when they touch it. One of them tries to burn it but it explodes when it catches on fire, destroying the ship. Back in the burning lands, Zoro, Sanji, Brook and The Samurai see Smiley shooting pieces of itself across the lake. Caesar then appears on top of the lab, explaining that Smiley was his experiment and that it is weak against water which is why it is shooting itself across the lake. After his speech, Luffy jumps up and grabs him.

Sanji, Kin'emon, Brook and Zoro see Smiley. Brook talks about a story about slime eating the clothes off of women making everyone act perverted except for Zoro, who points out that the slime is killing the fish in the lake, prompting Sanji to jump in to find the samurai's torso. Law tells Monet to take a walk with him while Chopper is left in the lab to find the antidote. Luffy faces off against Caesar who uses his Gas Robe attack until he discovers that Luffy is immune to poison. Caesar then uses his Gastanets and Smiley to injure Luffy who then grabs Caesar. Caesar then knocks Luffy out with an unknown ability. Robin, Franky, Tashigi and Smoker get knocked out as well. Law and Monet are walking down a hallway and encounter a mysterious figure who causes Law to break down in pain while the mysterious figure tells him that it has been a long time since they last met.

Law's heart is crushed by the mysterious man named Vergo who was sent along with Monet to watch over Caesar. Law gets knocked out by Vergo who had a bamboo stick with him imbued with Haki. Caesar tells his men to tie up the Straw Hats and G-5. Meanwhile Chopper is looking for a way to cure the children. Zoro's group are waiting for Sanji to rescue the samurai's torso. Sanji uses Haki to find the body and realizes it is in a shark's mouth. He manages to escape before the gas consumes him. The samurai then reveals himself as Kin'emon. He demonstrates his ability by cutting fire and by destroying the slime. He then attempts to find his son, Momonosuke. Zoro's group decides to aid him.

While still punishing Law, Vergo is revealed to be the base commander of the G-5 Marine Base. On an unknown island inhabited by extremely rude G-5 Marines, the citizens constantly ask if they could look for their missing children, who are revealed as the children in Caesar Clown's laboratory who were in fact kidnapped. The Marines refused to help because Vergo oversaw the missing reports and told the marines that they all died at sea in accidents. Meanwhile, Nami and Usopp are still dealing with the children going through their withdrawals before Caesar appears and convinces the children to go back to the laboratory by bribing them with candy. Zoro's group is still dealing with Smiley, which is furious that Kin'emon destroyed so much of its body and decides to send bigger slime attacks at them, chasing them back towards the laboratory. Luffy, Law, Robin, Franky, Tashigi, and Smoker, awake within a prison cell to both Vergo and Monet. Meanwhile, Caesar's soldiers close all entrances to the lab, leaving the G-5 Marines stranded outside to deal with Smiley. Vergo and Monet talk about the ambiguity of what Caesar's plan exactly is, to which Smoker calls out that his subordinates will die if he does nothing. After Vergo reveals he doesn't care, Smoker finds out that Vergo covered up missing children cases for Caesar. Law states that Vergo was never really loyal to the navy and originally was a pirate working alongside a notorious underworld broker known as "Joker". Vergo threatens both Tashigi and Smoker, saying they will both die, leaving his secret intact. Law then reveals that Joker's identity is one of the Seven Warlords: Donquixote Doflamingo.

As Luffy and Law remain captive in Caesar's lab along with the others who were captured, Caesar Clown goes to retrieve the children from the remaining Straw Hats. Meanwhile, Zoro's group are still running from the slime monster who had finally transferred itself to the ice lands, causing all of its pieces to converge together. At the ruined Lab, Usopp and Nami were confronted by Caesar who mercilessly suffocated them the same way he did to Luffy but was interrupted by the revived Brownbeard, who demanded his crew back. However, Caesar beats him and proceeds to do the same to the two escaping Straw Hats. With the children secured and returning to the lab, Caesar Clown sent orders to Monet to prepare the Transponder Snail to broadcast his "special experiment" to all known brokers to show them his weapon of mass destruction, among the viewers were the two supernovas, Eustass Kid and Killer.

At the lab, the G-5 Marine soldiers are banging on the door, demanding entry. Meanwhile, the children were returned to the Lab where Caesar ordered his subordinates to make sure they didn't escape again. However, Mocha begins to regain her senses, seeing Caesar's subordinates as monsters. Within Caesar's private quarters, Vergo and Monet are waiting for Caesar's return. As soon as he arrived, he revealed that he made a deal with Law in the past to give his heart to him, and in exchange, he would get to keep Monet's. He shows Law that Vergo is now in possession of his heart while he himself has Smoker's heart, but before he tortures him, Monet informs Caesar that the broadcast is ready. In the broadcast, it is shown that a very large candy is being offered to Smiley, which is a deadly weaponized gas known as Shinokuni (The Land of the Dead). Caesar then ordered the men who brought the candy to quickly return to the Lab. As Zoro's Group is being chased by Smiley, the poison beast sees the candy and promptly swallows it, ignoring the false heartfelt words from Caesar. He then laughs as everyone watching the broadcast sees the creature behaving strangely.

After Smiley swallows the over-sized candy, the candy coat dissolves revealing a special drug designed to convert the entire content of Smiley's body into a "perfect" weapon of destruction, Shinokuni. In the process, Smiley dies and in a sack of apples, an apple turns into a Devil Fruit. The beast's body transforms into poison gas spreading quickly throughout the island. Its lethal power was demonstrated when Caesar's men were caught in it, being petrified before the eyes of the Brokers and the captive Straw Hats. Zoro's team are seen desperately trying to outrun the approaching gas while Nami and Usopp help Brownbeard after their vicious attack by Caesar. At the Lab, Caesar reveals to his captives that they will get to experience the poison gas as well, moving them outside dangling in a cave. In spite of their situation, Law told Luffy that their original plan will still carry on and that it is time to strike back at Caesar.

As the Underworld Brokers watched the video feed of the captive Straw Hats and Marines, Eustass Kid (whose has a mechanical prosthetic left arm) and Killer decided to ignore it for more important matters, such as forming an alliance between the Kid Pirates, On Air Pirates and the Hawkins Pirates. Law then decided to set his plan into motion and orders Franky to blow a fireball at a destroyed ship, creating enough smoke to block the cage from being seen from outside. Law then breaks free, explaining that he switched the sea prism stones with fakes during his stay on the island, and proceeds to free the others and restoring Tashigi and Smoker in their own bodies while securing their aid. Franky however had to leave them and protect the Thousand Sunny. Meanwhile, Zoro and Nami's group are still running away from Shinokuni, and they manage to join up while escaping. Luffy's group managed to enter the lab with the aid of Law, and they opened the gate, allowing the G-5 Marines to get in before closing the gate, but the rest of the Straw Hats were still outside. Seeing their only chance of hope closing, Zoro and Kin'emon effortlessly cut the gate open, getting everyone inside safely.

Though the Straw Hats and Brownbeard managed to escape into the lab, they left behind a gaping hole. But they soon realise that Shinokuni can now enter the lab. The G-5 Marines panickingly seals the hole back up with various wooden and metal planks. They succeeded in sealing the hole as Shinokuni proceeds to spread throughout the island. Brook uses the power of his Devil Fruit to become a soul and survey the area outside of the lab, noting that 'it was like the land of the dead'. After regaining their senses, the G-5 marines then turn their guns and swords towards the Straw Hats preparing to arrest them. Nami notices Law and demands him to switch back her and Sanji's body, to which Sanji secretly refuses. Law agrees to return them to their original bodies and uses Shambles to switch their hearts back. Nami notices that she was wearing a different coat and punches Sanji, accusing him of peeping at her body. Law then explains to everyone present that they only have two hours to escape, he then continues by saying the only passage that leads safely leads out of the island is called R-66 and is found in Room R. The marines were reluctant, but quickly changes their mind when Smoker repeated the order to them. Smoker then orders Tashigi to take command of the men and rescue the children as he goes to confront Vergo. Meanwhile, Caesar Clown is celebrating the deaths of his victims but notices that the cage has no solidified bodies, which he needed to prove the power of Shinokuni. He also notices the absence of the G-5 Marines. Vergo states that Luffy and the others must have broken out of the cage and helped the G-5 soldiers' escape. Before Luffy went to fight Caesar again, Zoro calls out to Luffy reminding him that this is just the beginning of the New World and he mustn't let his guard down again, and Luffy happily complies as he plows through the Satyr soldiers. Caesar Clown then receives the news that the Straw Hats and Marines have broken into the Lab, leaving him alarmed and flabbergasted at their escape.

Caesar Clown, incensed with the humiliation that his prisoners escaped and are inside his lab, orders the passage between building A and B to be closed and Shinokuni to be let in to kill the intruders. Vergo, however decided to take care of them himself. Chopper, who was eavesdropping, sneaks out and tries to find his way to the children within the labyrinth that is the lab. Luffy, Smoker and Law were the first to cross the gate before the alarm sounded, indicating the gate is beginning to close. Tashigi instead heard the alarm and quickly ordered the G-5 marines to let the Straw Hats go and hurry towards the closing gate. When a wall was blown up in building A, Shinokuni flows in petrifying some marines while the rest hasten their escape. The Straw Hats and most of the marines got through the gate safety but a few stayed behind to help Tashigi across before the gate closes, losing themselves to the poison gas while their captain watches in horror. Caesar, angered that they survived, promised that no one will escape this lab alive.

Though most of the G-5 Marines got through the gate safely, they were attacked by the small dragon who after a while flew away in fear. The marines cheered as their beloved Vice Admiral Vergo shows up but that turned to horror when he brutally assaulted them. Tashigi tries to defend them from him but was viciously struck down. That action was enough to cause Sanji to come to the rescue, claiming he heard her tears falling. The Straw Hats (minus Sanji) and Brownbeard were still heading towards the end of the passage until the small dragon shows up and begins to attack them while Brownbeard suggests that he keeps running. Chopper manages to run into Mocha who was still hallucinating and manages to defeat the soldiers trying to apprehend her and give her a sedative to calm her down. Chopper then pleaded for her help to prevent the other children from eating the drugged candy. Meanwhile, Luffy and Smoker were racing towards building C where they believed Caesar and Vergo were located. They entered the private room where Caesar was angrily ordering Monet to release the poison gas on the marines only to turn around in shock of seeing Luffy fist buried in his stomach, who declared that he won't let Caesar escape again.

Luffy finally reaches Caesar's room and immediately punches the scientist, while Smoker leaves in order to find Vergo. Meanwhile, Sanji faces off Vergo while the passage between buildings A and B is closing and the previous one is opening, letting the poison gas enter. During the fight with Caesar, he tries to drain the oxygen in the area to kill Luffy but fails once he enters Gear Second and use some attacks with Haki, making the scientist angry to the point of using some techniques as oxygen-made sword and fire bursts. Meanwhile, both Sanji and Vergo start running away from the gas. During this fight, Trafalgar Law makes his way to building D, where the SAD is made and Monet decides to enter the fight to protect Caesar, while he flies away, and reveals her snow abilities.

Law walks into the SAD Room. The door closes on Section A, and it turns out Sanji is still alive. Tashigi tells the marines that the Vergo who attacked them is fake so that they could proceed with the mission. Vergo speaks with Doflamingo about Law while Baby 5 attacks him. Doflamingo stops her from attacking him and informs Caesar, Vergo, and Monet about Luffy's determination. Monet shows off her Snow-Snow Fruit powers to Luffy. Chopper keeps the drugged children busy so that Mocha can run off to stop the drug. The rest of the Straw Hats are busy escaping section B. Kin'emon and Brook cut down the dragon. A little girl tells the two hazmat suit guys that Momonosuke entered the secret room and turned into a dragon.

Chopper, in Monster Point, tries to hold the children for a while, however, can't do it without harming them, so he eventually fails and returns to his normal form. Meanwhile, Luffy faces Monet off and almost dies in the battle, due to having his body frozen, but recovers and counters with Haki. The counterattack, however, made a hole in the floor, leading to the garbage room, where Luffy fell to, and Monet gives farewell to him, as "he can only escape flying". Trafalgar Law prepares to attack the SAD Room, but is confronted by Vergo, who gives critical punches with his Haki-powered fists and bamboo. In the biscuit room, Monet prevents Mocha from fleeing with the candy, and the Straw Hats also help Mocha. After seriously wounding Law, Vergo is confronted by Vice-Admiral Smoker, who prepares to fight the other Vice-Admiral.

Smoker and Vergo begin their fight in the SAD Room. At the same time, Sanji, Tashigi, and the G-5 Marines are running through the battle torn B-block when a gas tank explodes, causing Shinokuni to be let in. Caesar Clown, sitting on the second floor of R-block with his subordinates in Vegapunk's old room, instructs that the doors to C and D-blocks be closed, driving everyone to the first floor of R-block where a trap is ready to expose them to Shinokuni. When one of Caesar's subordinates questions the nature of the gas, Caesar then makes a speech to his subordinates, saying that the poisonous gas bomb four years ago was Vegapunk's doing, and that Caesar tried to stop him. However, in a flashback it is revealed that Caesar constructed the weapon himself, and when he was told to stop and banished from the science squad, he set it off. While the gates to C and D-blocks are closed, Luffy meets a small dragon who can talk.

Luffy meets Momonosuke in the garbage dump of Block C. In a flashback, Momonosuke didn't want the candy Caesar gave out to the children and he got hungry, so he ate a devil fruit which turned him into a dragon. Momonosuke tell Luffy he wants to tell the other children of Caesar's true nature after overhearing him admitting to using the children as test subjects. Luffy and Momonsuke take off after the latter's hunger causes him to hallucinate Doflamingo and fly off with Luffy hanging on. Kin'emon, Usopp and Brook look for sea stone handcuffs. Smoker continues his fight with Vergo. Nami, Robin, Zoro and Chopper are going after the children. Robin gets stabbed by Monet in the arm and Zoro defends the Straw Hats against Monet.

Mocha runs off with the candy and she thinks back in a flashback. Mocha and Sind are on a ship to escape from the poison gas. Mocha wants to go back home to her family, cries, and Sind tries to calm her down, but he cries too. Caesar Clown finds them later and tells them that his own son died from the gas, and he hoped to not see any more children die from the poison gas. Mocha is still getting chased by the children who are drugged by the candy, and she is making sure they don't get their hands on the candy. Monet introduced new children to the other children in a flashback. Zoro is fighting against Monet while Nami, Robin and Chopper are going after Mocha and the children. She uses her devil fruit powers to reach the three and Zoro blocks her attack from hitting Nami. Monet hopes to finish off the weaker Straw Hats because it is a strategic tactic. Monet blocks the entrance with a snow wall and is about to bite Nami on the arm until Robin prevents that from happening. Zoro opens up a pathway out of the room so that Nami, Robin and Chopper to get away from Monet. Luffy and Momonosuke is still getting out of the garbage chute until Momonosuke stopped and they both fell back down the chute. Caesar Clown is watching Monet fighting Zoro and the children chasing after Mocha. He talks about Shinokuni getting inside the facility being an important use. He says that they'll be killed soon. Usopp, Kin'emon and Brook are getting chased by the poison gas and are trying to find the sea stone cuffs and Momonosuke. Monet asks Zoro why he is only blocking her attacks instead of attacking her. Sanji and the G-5 Marines arrived, and Sanji sees Zoro and makes fun of him and the marines do the same. Sanji and the marines see Monet and admire her beauty. Monet uses her devil fruit powers and bites off a shoulder of a few marines causing them to panic. Sanji and the marines run off while Tashigi stays with Zoro to fend off Monet.

Mocha is still running away with the candy, and the kids are chasing her. Chopper, Nami, and Robin come to her and the children's aid. Then, G-5 and Sanji goes in their direction. At the Biscuit Room, Tashigi battles Monet alone after making Zoro stay out of it, due to believing through their past encounters that Zoro can't cut women. Believing that she found Zoro's weakness Monet continues her assault and almost breaks Tashigi's shoulder with her snow powers, but Zoro comes in and vertically splits Monet in half with a powerful One Sword Style technique, shocking both her and Tashigi. Despite being unable to reform due to her fear knowing Zoro would've killed her if he'd used Haki, Monet tries to use one-half of her body to attack Zoro from behind but is promptly cut down by Tashigi. At the bottom of the C building, Luffy barely manages to hold onto a small ledge and begins to climb out, carrying an unconscious Momonosuke up the chute.

Mocha runs away with the candy while the children are on hot pursuit. Chopper, Nami and Robin try to fend off the children, but they manage to break through them making Mocha leave herself with no choice but to eat the candy. She eats the candy and Chopper watches in horror. Zoro and Tashigi are running away from the poisonous gas while Tashigi wake up and admires Zoro's sword, Shusui which he got from Ryuma at Thriller Bark. Chopper walks on over to Mocha to check and see if she is still alive and Mocha wanted to save her friends, so she sacrificed herself for them. In a flashback, Chopper is holding off the children by closing the door while Mocha is supposed to run away. Mocha hesitates to run off, but Chopper explains the situation to her. Luffy and Momonosuke finally got out of the garbage chute and immediately ran into Caesar's subordinates who quickly recognize Luffy. Luffy uses Conqueror's Haki to knock most of them out when they were about to attack them, and he asked one of them where Caesar is.

Zoro carries Tashigi away from the poisonous gas. Sanji and the G-5 marines continue to assist Chopper vaccinate the children. Usopp finds a door that leads to the room where Caesar and his subordinates are watching the Straw Hats and the Marines on a screen. Caesar notices Brownbeard on the screen and confronts him. Brownbeard tells Caesar that he wants to get his crew back, but Caesar tells him they were all killed by the poison gas. Brownbeard tries to warn Caesar's subordinates, but Caesar drugs him to keep him quiet. Caesar orders his subordinates to get rid of Brownbeard, and they fire at him. Luffy arrives just in time and punches Caesar, before asking him about the island. Caesar tells him Punk Hazard is not supposed to exist, and nobody is supposed to know what happens on that island. Vergo covers up any information about that island and anything that happens there – the SAD production is run by Doflamingo, and SAD produces SMILE, an artificial Zoan Devil Fruit. One of the Emperors is forming an army of people who have eaten these artificial fruits. Caesar challenges Luffy to dare pick a fight with such people, only for Luffy to punch Caesar, and tell him that he has been picking fights all along.

Caesar tells Luffy to not underestimate Doflamingo, but Luffy keeps on attacking Caesar. Smoker continues his fight with Vergo. The Straw Hats, G-5 marines and the children run from the gas and continue to head towards building R-66. Caesar's subordinates find Usopp and attempt to attack him. After being told Momonosuke turned into a dragon Kin'emon runs back to Building B, believing the dragon he and Brook killed was him with Brook trying to stop him as the room is now filled with poison gas. Vergo beats Smoker but Smoker manages to retrieve Law's heart and gives it back to him. Law tells Doflamingo he is going to defeat Vergo. Doflamingo tells Law to not underestimate Vergo because of his Haki. Vergo imbues Haki onto his whole body and attempts to kill Law but Law cuts him in half along with the SAD and the island. Law tells Doflamingo that he and the supernovas are going to be the leaders of the new era.

The kids stopped because they are tired and scared of running. Vergo attempts to kill Law even though he is cut down. The Straw Hats convinced the children to run, and they continue to escape the poison gas. Caesar tells his subordinates to release the poison gas into building R-66. Caesar consumes the gas and becomes a big monster. He then consumes his subordinates to intimidate Luffy. Usopp tells Caesar's subordinates that Luffy will never betray his crew. Luffy defeats Caesar with Grizzly Magnum and sends him flying away.

Luffy defeats Caesar and sends him flying out of the facility. Chopper's group runs into Brook carrying the petrified Kin'emon. The Straw Hats, G-5, the children and Law made it to Building R-66 where they prepare to leave the building. Baby 5 and Buffalo arrive via the latter’s Spin-Spin Fruit powers allowing him to turn any part of his body into a propeller, and spot Caesar and attempt to rescue him after contacting Doflamingo. Franky then spots the two from the deck of the SAD tanker.

Franky begins to attack the two Donquixote pirates who retaliate with Baby 5 turning into weapons with her Arms-Arms Fruit powers and Buffalo launching her at their robot foe. Caesar Clown regains consciousness and, after realizing his defeat remembers he still possesses Smoker's heart and prepares to stab it. Inside Room R, the Straw Hats and everyone else are waiting for their comrades to return with Mocha before riding the transport cart out of the collapsing building. They managed to reach the group at the same time Ussop returned with Sea Stone handcuffs and the former subordinates of Caesar Clown. Momonosuke however was shockingly alarmed to see his father petrified. In Dressrosa, Doflamingo sent his farewells to Vergo and Monet who survived her encounter with Tashigi and Zoro. Doflamingo then asks Monet to activate the island's self-destruct, but Monet tells him that she is already doing that. With the island's destruction in her hands, Monet says her goodbyes as she reaches for the switch. Moments later a massive explosion rocks the entire mountain base.

Monet is moments away from activating the self-destruct button when she feels her heart being stabbed and collapses. At the same time, Caesar Clown stabs the heart believing it to be Smoker's. The Straw Hats are still racing towards the exit of the collapsing lab when they feel the explosion of the SAD room and then see Shinokuni on their trail. Smoker, seeing that they nearly reached safety, questions Trafalgar Law as to why he possessed his heart the whole time. Law reveals the clever deception he played on the mad scientist where he returned Monet's heart to Caesar without him knowing. At the tanker, Baby 5's Missile Girl attack failed to take down the Franky Shogun and their duel continued whereas Buffalo contacted Doflamingo of the situation. After confirming that the island wasn't destroyed as intended, Doflamingo decided to tend to the matter himself and is seen somehow flying over the sea towards Punk Hazard.

General Franky puts up a good fight against Buffalo and Baby 5. He sends them flying away with a General Cannon (a land-based version of the Sunny's Goan Cannon), but the two refuse to stay defeated despite their injuries. The fight however was interrupted with the arrival of the mine cart filled with all of the lab escapees. Seeing that Law is allied with the enemy and that the odds are against them, the two decided to hightail out of Punk Hazard along with Caesar Clown in their possession. Before Law could stop them, Luffy told Law that Usopp and Nami would handle this. The two Straw Hats proved Luffy right as they easily stopped the fleeing pirates and succeeded in capturing Caesar Clown. Doflamingo is still flying toward Punk Hazard imagining what torture he would inflict on the brats. Meanwhile, on a giant penguin, a mysterious man is wondering which direction leads to Punk Hazard.

The Straw Hat Pirates and the Marines are about to enjoy a large dish prepared by Sanji, though the Marines are still adamant in keeping themselves from being friends with pirates. While the stove is being constructed, many events occur; Kin'emon is alive the whole time, Law removes the drug from the children, Momonosuke's human form is revealed, Nami complies with Tashigi's plea to let her take care of the children, Mocha has recovered fully from the drug overdose and the poison gas is revealed to be lethal after a full day's effect. While the group celebrates their victory, Smoker talks with Law about him manipulating Luffy, but Law says that it is the other way around. Previously, during their encounter in the mountains, Law revealed his goal to defeat Kaido with Luffy's help, but Luffy expressed his desire to defeat all four of the Emperors.

The Straw Hats, Kin'emon, Momonosuke, G-5, and the kids are all having fun while Law and Smoker talk. It is revealed in a flashback that Law and Luffy plan to take down Kaido of the Beasts. After the feast, the Straw Hats are about to set sail and leave. While they are seeing the kids off, G-5 starts insulting them and they put up a barricade so the children can't see them. The children are crying and sad and they remember how the Straw Hats helped them and say they want to say good-bye. G-5 continues to insult them and says that pirates are evil, and the navy is justice, the children are still crying. Tashigi tells them to stop insulting them, but they say that if they stop, they'll start to like them and then they start crying. The Straw Hats and Law then head to the Thousand Sunny. Zoro asks why Law is going with them and Usopp tells him that Luffy got them into more trouble. Doflamingo is still flying but then stops when he sees the life raft from his tanker. He sees Baby 5 and Buffalo's heads on it and a Transponder Snail that resembles Law. Law tells Doflamingo that they have Caesar and says that since he can't produce SMILE anymore his business partner, Kaido will kill him. Doflamingo tries to negotiate with him, but Law says that there is only one thing he can do: resign from being a Warlord. It shocks everyone on the raft and then Law says that if it is not in the paper by tomorrow morning, he won't give it back to Caesar and hangs up. Doflamingo then gets angry and starts cursing Law.

On Punk Hazard, Caesar's former minions go in search of those who were petrified by Shinokuni. All of a sudden, Doflamingo appears from the sky and throws Baby 5 and Buffalo's heads back onto their body. Before any of the G-5 soldiers could attack, Doflamingo used Conqueror's Haki and knocked out a very large majority of them. Even then, the remaining soldier couldn't move because of his devil fruit powers. Doflamingo even has some of the G-5 soldiers kill each other demanding the whereabouts of Law. Smoker steps into the fight, launching White Blow at Doflamingo. As the fight progressed, some G-5 soldiers decided to aid Smoker. Doflamingo moved to confront the soldiers, but his attack hit Smoker instead as he was moving to defend the soldiers and was severely injured. On the Sunny, Luffy asks why they are going to Dressrosa. Law states he has business to attend to. All of a sudden, the sea currents start to shift at an angle as they slide down a sea slope. After they get out of rough water, Luffy explains to the crew about the alliance and the plan to kill Kaido. Back on Punk Hazard, Doflamingo is about to unleash the final blow onto Smoker. Then, Kuzan appears and asks Doflamingo to step aside as Smoker's friend.

Doflamingo prepares to finish Smoker off but is stopped by Kuzan's ice which freezes everything around the Warlord, including himself. But he manages to break free from the ice before freezing completely. After some talk, Doflamingo leaves with Baby 5 and Buffalo back to Dressrosa, as Kuzan asks for G-5 to treat Smoker. After getting treated, Smoker starts talking with Kuzan about the Marines and Underworld, insinuating that the former Admiral has "business unseen to the government". At the Thousand Sunny, Law tells some details about the recently formed pirate alliance, which makes some of them afraid of being targeted by an Emperor due to holding Caesar Clown captive. After having some fun, Momonosuke is introduced to the Straw Hats ship by Nami, which makes Sanji, Kin'emon, and Brook jealous of his "luck" with women. At night, a mysterious figure is seen making contact with Kung-Fu Dugongs that have just found the Straw Hat pirates.

As the Straw Hats relax as they leave Punk Hazard far behind, they stay prepared in case of Doflamingo's return. During the dead of night, a group of sea creatures led by a pirate named Breed attacks and abducts Caesar and takes him to his island-sized ship. When Luffy, Law, and Chopper set out in the Shark Submerge III to retake Ceasar, Law identifies the creatures as Sea Lapahns. When they arrive on the ship they are attacked by the Sea Lapahns, as well as an octopus boxer, black belt penguin, sumo capybara, and a Kung-Fu Dugong that can use Haki. After beating then it is revealed the Kung-Fu Dugong is the same one that became Luffy's disciple in Alabasta. With Chopper translating the Kung-Fu Dugong explains that after being inspired by Luffy he set out to sea and started a pirate crew with the other animals but were enslaved by Breed shortly after arriving in the New World. Breed appears and throws slime that forms a collar around Chopper's neck and forces him to attack Luffy and Law. Breed explains his Pet-Pet Fruit powers allow him to control anything he puts his collars on, before collaring Luffy and Law as well.

Breed reveals that he plans to turn every human into an animal through the artificial Devil Fruit. Breed commands Luffy and Law to fight each other in a stadium-like place, while Dugong begs him to make them stop. Breed accepts his offer and makes Dugong fight Luffy and Law instead. Luffy and Law fall into the ocean after getting punched off the ship by the Kung-Fu Dugong.

Chopper and Dugong attempt to go against Breed, but Breed orders the other animals to attack them. At that point, Law, Caesar, and Luffy enter the room and Luffy knocks the animals out. Law explains how he saw through the Peto-Peto's weakness, which requires the victim to hear Breed's voice to obey him. Breed uses his Devil Fruit on himself and manages to enhance his strength and muscles and tries to attack Luffy and the others. However, his control over the other animals' fades, which allows them to work together and hold Breed still. Luffy and Dugong throw a combined punch to Breed and manage to defeat him. After thanking everyone for their help the Sea Monster Pirates set off for new adventures. Later on, on the Sunny, the news about Doflamingo's resignation arrives along with the news of Law's and Luffy's alliance. The news also announces the alliance between the Kid Pirates, On Air Pirates, and Hawkins Pirates. The day's news causes chaos in the New World.