Chapter 661

Chapter 661 is called "A Lake That Spews Forth Coat-Jackers".

Cover Page
From the Decks of the World Vol. 42 - "Impel Down - Warden Hannyabal and Chief Guard Domino".

Short Summary
At the lake near the center of Punk Hazard, Luffy, Zoro, Usopp, and Robin have their ship sunk by centaurs. Zoro moves to attack them, but sharks appear, revealing that it is actually part of the ocean. The centaurs attack again, but Brook appears and wounds them, giving his crewmates time to defeat the sharks. Freezing, the group targets centaurs for coats. At the same time, Trafalgar Law takes on Smoker and the Marines, destroying their battleship and rendering them unable to fight. He also switches the minds of Franky, Chopper, Nami, and Sanji, throwing them into chaos.

Chapter Notes

 * Hannyabal and Domino are seen for the first time since the timeskip. Hannyabal is the new Impel Down Warden while Domino is now one of the chief guards.
 * The boss of the centaurs is revealed to be the former pirate Brownbeard, who is shown to be an alligator centaur.
 * Trafalgar Law's Devil Fruit is revealed to be the Ope Ope no Mi.
 * It is revealed that Tashigi knows about and possesses Haki, though she is not as proficient in using it as Smoker.
 * One of the centaurs mentions that Luffy, and by extension Zoro, are pirates from the "Worst Generation".