When does Lost return?

Lost is an American science fiction drama television series that aired on ABC from September 22, 2004, to May 23, 2010, over six seasons, comprising a total of 121 episodes. Inspired by the 2000 Tom Hanks film Cast Away, the show is told in a heavily serialized manner. The fictional universe and mythology of Lost were expanded upon by a number of related media, most notably a series of short mini-episodes called Missing Pieces and a 12-minute epilogue titled "The New Man in Charge"