One Piece: Stampede

One Piece: Stampede was released as part of the franchise's 20th anniversary celebration and features an unprecedented gathering of characters from across One Piece's history in one location: the Pirate Festival, where pirates from around the world compete for the treasure of the Pirate King himself. The central conflict involves the dangerous pirate Douglas Bullet — a former crew member of Roger's own pirate crew, imprisoned for decades in Impel Down and now released — whose power has grown to a level that threatens even the Admirals. The film is essentially a love letter to One Piece's history, bringing together protagonists, antagonists, and side characters from multiple eras in a massive crossover battle.

Stampede is the most fan-service-heavy of the modern One Piece films, but in the best way — it treats that fan service as genuine plot fuel rather than mere cameo appearances. Seeing characters like Smoker, Law, Boa Hancock, Buggy, and Crocodile all operating in the same space creates moments that longtime fans have dreamed of, and the escalating battles across the film's second half are spectacular. Bullet himself is a compelling villain precisely because he is one of the few characters in the franchise whose raw power makes him a plausible threat to virtually anyone. While entirely non-canon, Stampede is considered essential viewing for dedicated One Piece fans and an ideal film for those who want to see how the franchise handles a true all-stars crossover.