What is one piece episode 590?

One Piece Episode 590 is titled "History's Strongest Collaboration vs. Glutton of the Sea". It aired on June 23, 2013, and is part of the Punk Hazard Arc. The episode features Luffy and his crew, as well as Law and his crew, teaming up to take on the powerful artificial giant, PX-5. The group also faces off against the gluttonous Fishman Vander Decken, who is causing chaos on the surface. The episode ends with the reveal of the kidnapped children who were being used as experiments on Punk Hazard.