One Piece: The Giant Mechanical Soldier of Karakuri Castle

The Straw Hat crew salvage a treasure chest but it turns out to be an old lady hiding inside it. To get the Straw Hat Pirates to take her home, she promises them the treasure of a golden crown to Mecha Island.

One Piece: The Giant Mechanical Soldier of Karakuri Castle is a 2006 fantasy animation movie directed by Kônosuke Uda, starring Takeshi Aono, Naya Fujikawa, Takahiro Fujimoto. It holds an IMDb rating of 6.4/10 from 2,407 votes and runs 1h 34m.