Strong World is the 10th film of the One Piece series written by manga creator Eiichiro Oda himself.

News of the movie first appeared during a showing of the Episode of the Island of Perpetual Winter, which a teaser for the tenth movie was revealed. The movie was originally meant for a spring release in 2009. But complications with the script pushed the release date back. Eventually the movie premiered on December 12, 2009

As stated, the film is an original story written by Eiichiro Oda himself in honor of One Piece's Tenth Anniversary (In previous films Oda only supplied character designs and approved story ideas. For this one Toei personally asked if he would write the story). The movie is apparently canonical and set after the Thriller Bark Arc, as Brook is shown alongside the other Straw Hats (making this his first movie appearance), as well as Sengoku, Garp, Shanks and Whitebeard (the latter two as stand-ins with no voice roles).

As a promo for the movie, the first 1.5 million japanese moviegoers who went to see the One Piece Film Strong World received Volume 0 of the manga. The "0th volume" bonus gift depicts the world of One Piece from 20 years ago. It's said this volume is directly related to the plot of the movie — in particular, the Pirate King Gol D. Roger versus the legendary pirate "Golden Lion" Shiki

Synopsis

East Blue in crisis? The news hits the Straw Hat Crew along their journey. With their hometowns facing a crisis, Luffy and his friends put their adventures on hold and search for a way back to East Blue, when suddenly a mysterious flying pirate ship appears out of the sky. The man riding that ship is none other than the infamous Devil Fruit user, Golden Lion Shiki, the same legendary pirate who managed to escape the great undersea prison Impel Down, and stood among such famous pirates as the Pirate King Gol D. Roger and Whitebeard. After abducting Nami, Shiki sends Luffy and his crew hurdling down to earth. Separated, the crew finds themselves placed in a battle of survival with terrifying beasts on a flying archipelago. Meanwhile, with tears in her eyes, Nami begs Shiki to let her join his crew.

Creatures that evolved on their own respective islands? What happens to the Straw Hat pirates? What is Shiki after? An adventure where the Straw Hats place their very lives on the line begins now!