Caesar Retrieval Arc

The Caesar Retrieval Arc is the eleventh filler arc, and the second filler arc after the time skip.

In this arc, a mysterious person manages to get into the Thousand Sunny and kidnap the already-kidnapped Caesar Clown away from the Straw Hat Pirates, who are on their way to Dressrosa. However, the recently formed Heart-Hat alliance will need to get Caesar back, in order to keep up the plan to take down both Donquixote Doflamingo and Kaido. But it seems that retrieving the scientist won't be that easy, as the person has abnormal abilities.

Summary
Soon after Trafalgar Law and the Straw Hats left Punk Hazard with Caesar Clown in hand, they are wary of being attacked by Doflamingo. A group of dark figures suddenly leaps on board the Thousand Sunny and attack the crew members, ceasing only when it is apparent that Caesar was snatched from the Straw Hats by a strange man named Breed, who has eaten the Peto Peto no Mi. (At this time, the abilities are unknown to the crew.) Law, Luffy, and Chopper pursue him in the Shark Submerge III, managing to sneak into Breed's ship.

Meanwhile, it is revealed that Breed does not work for Doflamingo as expected, but he is connected somehow to the underworld, knows Caesar's abilities as a scientist and kidnapped him in order to assist him in creating his dream world.

The inside of Breed's ship is shaped like a huge aquarium. As Luffy's group arrive at the hall, they once again get attacked by the same figures, who are revealed to be animals, enslaved under Breed's ability. Luffy manages to defeat their leader, who appears to be one of the Kung Fu Dugong he befriended in Arabasta. Apparently it started a pirate group with other sea creatures to follow Luffy's dreams as well, but Breed enslaved the group and is forcing them to do his bidding. Breed appears and manages to use his ability on Chopper. Chopper is ordered to destroy Luffy and Law, and to everyone's surprise he is unable to control his body and uses his Rumble Ball to transform. When Luffy tries to prevent Law from attacking Chopper, Breed manages to attach collars to Luffy and Law as well.

Trivia

 * This is the second filler arc set in the New World.