
Titled "Pirate Alliance," this chapter seals the pact between Luffy and Law against a Yonko. Law restores most of the swapped bodies, the crew sets its goals, and Caesar unleashes a monstrous slime that devours his own centaurs in the burning lands.
Despite Nami calling it madness, Luffy hears which Emperor Law has in mind and instantly agrees to the alliance. He breaks the news to the rest of the crew, who balk at challenging a Yonko so soon. Robin warns that betrayal shadows every pirate pact and that Luffy trusts too freely, yet Luffy simply asks Law plainly whether he intends to turn on them. Law says no, and Luffy reassures his crew that two years of training leaves them ready for anything.
Law uses Shambles to return everyone to their correct bodies, though Nami lands in Sanji's frame since her own is absent, to the amusement of the others. Law explains that the World Government has long sought to grow humans into giants for a super-soldier army, and that Caesar is racing to perfect the process and surpass Vegapunk. The crew commits to three aims: cure the children, reassemble the samurai, and abduct Caesar. Law clarifies the kidnapping is meant less for ransom than to sow chaos, and warns that only Haki users can safely approach the gas-bodied scientist.
Law confirms Zoro and Sanji join him as Armament Haki users, and Chopper is comically lashed to Law's sheath to hunt down the children's cure. Outside, the G-5 marines clash with the centaurs, several of them former prisoners listed as dead in the old report. Ignoring an urgent Den Den Mushi call he already predicts, Caesar promises to introduce his pet. On the burning side, two panicking centaurs release a formless blob that gasses and absorbs them, the creature revealed as Slime. The cover story closes From the Decks of the World at the graves of Whitebeard and Ace.

When I first decided to commit to watching One Piece seriously, I knew I was embarking on one of anime's longest and most beloved series. With over 100...

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Chapter 668 of One Piece, titled "Pirate Alliance," covers Luffy agreeing to ally with Trafalgar Law against a Yonko despite his crew's doubts. Law restores the crew's swapped bodies and reveals Caesar Clown's plan to create giant super soldiers, while a new gas monster called Slime devours two centaurs on Punk Hazard.
In Chapter 668, Luffy quickly agrees to ally with Law after hearing which Yonko Law intends to challenge, brushing off his crew's fears. When Robin warns that pirate alliances often end in betrayal, Luffy simply asks Law directly whether he plans to betray them, and accepts Law's denial at face value.
In Chapter 668, the Straw Hat Pirates commit to curing the drugged children, reassembling the frozen samurai's body, and kidnapping Caesar Clown. Law explains that abducting Caesar is meant to sow chaos rather than collect a ransom.
Slime is a formless, gas-based creature that first appears in Chapter 668 when two panicking centaurs release it, and it immediately gasses and absorbs them. It debuts on the burning side of Punk Hazard as one of Caesar Clown's creations.
According to Chapter 668, Law warns that only users of Armament Haki can safely approach Caesar Clown because his body is made of gas. Law confirms that Zoro and Sanji both qualify as Haki users who can join him on the mission.
Looking for more on Chapter 668? The One Piece Wiki on Fandom has a dedicated page with community notes.
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