One Piece: Giant Mecha Soldier of Karakuri Castle backdrop

One Piece: Giant Mecha Soldier of Karakuri Castle poster

Where to watch One Piece: Giant Mecha Soldier of Karakuri Castle(2006)

Movie · 2006 · 1h 34m · Animation, Adventure, Action

One Piece: Giant Mecha Soldier of Karakuri Castle isn't currently available on any streaming service in the United States.

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Where to stream One Piece: Giant Mecha Soldier of Karakuri Castle

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One Piece: Giant Mecha Soldier of Karakuri Castle isn't currently available on any streaming service in the United States.

Data updated on October 11, 2026. Availability data from JustWatch.

One Piece: Giant Mecha Soldier of Karakuri Castle plot summary

The Straw Hats visits an island, known as Mecha Island, where a fisherman sings an old folk song about a Golden Crown. Searching for that mysterious treasure, they find a hidden entrance into the island. The island's leader, Ratchet, impressed with the find and in search of the Golden Crown himself, invites the crew to join him in his search and the crew along with Ratchet and his henchmen enter the cave. As it turns out, the islands true form, is that of a giant turtle. Ratchet, who had known this all along, uses his mechanical castle to take control of the turtle, in order to use it, to take over the world. Now the Straw Hats have to stop not only Ratchet, but also the helpless turtle, from crashing into a nearby island.