"One Piece: Stampede" is the 14th theatrical version of the "One Piece Series" and is also the 20th anniversary of the "One Piece" animation. Many navigators, represented by supernovas, have appeared at the world's largest navigator celebration - the Navigation Expo. The Straw Hat Pirates also received an invitation from the organizer Festa and boarded the Thousand Sunny. It was originally thought that the navigators' fanatical Expo was just to compete for the "treasure left by One Piece Roger". Just as the battle for the mysterious treasure was in full swing, Douglas Barrett, a terrible threat that stood in front of Luffy and others, suddenly appeared! The enemy and us melee with hidden conspiracy is about to break out...