A Battle in the Heat! Luffy vs. The Giant Dragon!

Sinopsis

Luffy, Robin, Usopp, and Zoro face down a powerful dragon as the battle heats up on Punk Hazard! And Luffy finds himself on the dragon's back during the attack, a mysterious discovery adds to the mystery of the island! Meanwhile, danger closes in for the rest of the Straw Hats on the Sunny...