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One Piece is a Japanese anime television series produced by Toei Animation that premiered in October 1999. It is based on Eiichiro Oda's manga series of the same name. The story follows the adventures of Monkey D. Luffy, a boy whose body gained the properties of rubber after unintentionally eating a Devil Fruit. With his crew, named the Straw Hat Pirates, Luffy explores the Grand Line in search of the world's ultimate treasure known as the "One Piece" in order to become the next Pirate King.

Since its premiere in Japan, more than 1,000 episodes have been aired, and later exported to various countries around the world.

Source: Wikipedia