Lost

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.

http://en.wikipedia.org/wiki/Lost_(TV_series)