One Piece , titled "The Silver Fortress! Luffy and Barto's Great Adventure!" , marks the beginning of the Silver Mine Arc . This short filler story acts as a direct tie-in to the feature film One Piece Film: Gold . Key Plot Points
: The mine is controlled by Bill , the leader of the Silver Pirate Alliance. Bill possesses the Gutu Gutu no Mi (Smelt-Smelt Fruit), which allows him to turn his body into a blast furnace and forge various silver weapons. Why This Episode Is Interesting One Piece Episode 747
: The episode introduces Desire , a member of Bill's alliance who has a shared history with Bartolomeo from their days as delinquents in East Blue. One Piece , titled "The Silver Fortress