LOST - "The Economist" - Locke's hostage may be the key to getting off the island, so Sayid and Kate go in search of their fellow castaway in an attempt to negotiate a peaceful deal, on "Lost," THURSDAY, FEBRUARY 14 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/MARIO PEREZ) MATTHEW FOX, EVANGELINE LILLY