Lost is an American television drama series that originally aired on the American Broadcasting Company (ABC) from September 22, 2004 to May 23, 2010, over six seasons, comprising a total of 121 episodes. Lost is a drama series primarily based on character development, and containing elements of science fiction and the supernatural. It follows the survivors of the crash of a commercial passenger jet, flying between Sydney and Los Angeles, on a mysterious tropical island somewhere in the South Pacific Ocean. The story is told in a heavily serialized manner. Episodes typically feature a primary storyline on the island, along with a secondary storyline from another point in a character's life.