As a child, Monkey D. Luffy dreamed of becoming King of the Pirates. But his life changed when he accidentally gained the power to stretch like rubber...at the cost of never being able to swim again! Years, later, Luffy sets off in search of the "One Piece," said to be the greatest treasure in the world...

Things are looking grim on Punk Hazard as deadly gas set off by a mad scientist envelops the island. Luffy and the rest of the Straw Hats are on a mission to both take down Caesar Clown and escape to safety before the gas can get them!