One Piece season 13
The thirteenth season of the One Piece anime series titled "Impel Down", was produced by Toei Animation, and directed by Hiroaki Miyamoto based on Eiichiro Oda's manga by the same name. It deals with the imprisonment of Monkey D. Luffy's adoptive older brother Portgas D. Ace and Luffy's attempt with Boa Hancock's help to infiltrate the great prison Impel Down to save him. Luffy meets several old enemies prisoners from his past in this arc, including Buggy the Clown, Mr. 2, and Mr. 3. There is also a 4 episode arc set outside the current continuity titled "A Gold Lion's Ambition", which serves as a prologue to the concurrently released One Piece Film: Strong World. This arc features Luffy and his crew's run-in with a group of pirates hired by Shiki, the film's main antagonist. Following this arc, the Impel Down story line continues where it had left off.
The season began broadcasting on Fuji Television on October 18, 2009, and ended on June 20, 2010, totaling 35 episodes. This season's beginning was announced in the One Piece Movie 10 Guide Book, "One Piece-Pia". The season was released through DVD compilations; the first two were released on June 1, 2011. The last two DVD compilations were released on September 6, 2011.
The season used two pieces of theme music. The first opening theme, titled "Share the World" by TVXQ continues to be used for the beginning of the season. The second opening theme, starting from episode 426 onwards, is "Kaze o Sagashite" performed by Mari Yaguchi with the Straw Hats.