Lost is an American live-action television series. It follows the lives of plane crash survivors on a mysterious tropical island, after a commercial passenger jet flying between Sydney and Los Angeles crashes somewhere in the South Pacific. Each episode typically features a primary storyline on the island as well as a secondary storyline from another point in a character's life, though other time-related plot devices change this formula in later episodes. The pilot episode was first broadcast on September 22, 2004, and since then five full seasons have aired with a sixth currently in progress set to finish on May 23, 2010. The show airs on the American Broadcasting Company in the United States, as well as on regional networks in many other countries.
Due to its large ensemble cast and the cost of filming primarily on location in Oahu, Hawaii, the series is one of the most expensive on television. It was created by Damon Lindelof, J. J. Abrams and Jeffrey Lieber and is produced by ABC Studios, Bad Robot Productions and Grass Skirt Productions. The score is composed by Michael Giacchino. The executive producers of the final season are Lindelof, Abrams, Bryan Burk, Jack Bender, Edward Kitsis, Adam Horowitz, Jean Higgins, Elizabeth Sarnoff and Carlton Cuse.