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
: While the Straw Hats are sailing toward Zou on Bartolomeo's ship, the Going Luffy-senpai , they are ambushed by a mysterious group of female pirates. Luffy and Bartolomeo are kidnapped and taken to the "Silver Mine," a fortress on a massive silver island. One Piece Episode 747
: In a rare moment of vulnerability, Luffy is trapped inside a giant, heavy metal ball that restricts his movement, while Bartolomeo is glued to a pickaxe, preventing him from crossing his fingers to use his Barrier-Barrier powers. One Piece , titled "The Silver Fortress
: 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 Key Plot Points : While the Straw Hats
: The episode focuses heavily on the dynamic between Luffy and his biggest "fanboy," Bartolomeo. Seeing them forced to work together without their usual powers provides a comedic break from the high stakes of the previous Dressrosa Arc.
: The Silver Mine Arc introduces characters and themes that lead directly into the events of Film: Gold , specifically introducing the influence of the "Gild Tesoro" organization.