One Piece Movie 14: Stampede - Episode 1 Instant

While is a standalone feature film rather than an episodic series, there are specific "prequel" episodes in the main anime and a primary plot for the movie itself that match your interest. Prequel Episodes (The "Carbonic King" Arc)

: "Special Edition! Clash! Luffy vs. the King of Carbonation". One Piece Movie 14: Stampede - Episode 1

: The world's most infamous pirates gather for the Pirates Festival , organized by the mysterious Buena Festa. The main attraction is a race to find a lost treasure that once belonged to the Pirate King, Gol D. Roger . While is a standalone feature film rather than