Quick recap
A 2018 TV special retelling the Jaya and Skypiea arcs with new animation. The crew finds clues to an island in the sky, meets Montblanc Cricket, descendant of the explorer Noland, and rides a giant sea current up into the clouds. In Skypiea they face Enel, who calls himself a god and controls lightning, and learn about the old war between the sky people and the Shandia over the land. Enel plans to destroy everything and leave for the moon. Luffy, immune to electricity thanks to his rubber body, beats Enel and brings peace. The golden bell rings out and shows Cricket, far below, that the sky island is real.
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