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 Staw Hats have left Punk Hazard with Caeser Clown in hand, they are wary of being attacked by Joker (Don Flamingo) because of their threat to his power. A group of dark figures suddenly leap on board the Going Merry and attack the crew members, ceasing only when it is apparent that Caeser was snatched from the Straw Hats by a strange man by the name of Breed, who has eaten the Peto-Peto devil fruit. (At this time, the abilities are unknown to the crew.) Trafalgar Law, Monkey D. Luffy, and Tony Tony Chopper pursue in the shark submarine, managing to sneak on to Breed's ship.

Meanwhile, it is revealed that Breed does not work for Don Flamingo as expected, but he is connected somehow to the underworld and knows Caeser's abilities as a scientist. The scene ends with him approaching Caeser in a cage with his devil fruit ability starting to appear.

The figures attack Luffy, Law, and Chopper on the trip, but Luffy defeats the leader, a Kung Fu Dugong that had made Luffy its master back in Alabasta for defeating it. Apparently it made a pirate group with other sea creatures to follow Luffy's dreams as well, but Breed ensalved the group and is forcing them to do their bidding. Breed appears and manages to throw green slime at the group, which ends up hitting 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.