One Piece: Giant Mecha Soldier of Karakuri Castle

In "One Piece: Giant Mecha Soldier of Karakuri Castle," the Straw Hat crew stumbles upon Mecha Island, lured by the promise of a Golden Crown. The island's true nature as a colossal turtle is revealed, housing Ratchet's sinister mechanical castle. This contraption allows Ratchet to manipulate the turtle's movements, aiming to conquer the world. The Straw Hats, entangled in Ratchet's machinations, must thwart his plans and prevent the impending destruction of a nearby island.