LOST - "Meet Kevin Johnson" - Sayid confronts Ben's spy on the freighter, and Ben urges daughter Alex to flee Locke's camp in order to survive an impending attack, on "Lost," THURSDAY, MARCH 20 (9:00-10:02 p.m., ET) on the ABC Television Network. (ABC/MARIO PEREZ) HAROLD PERRINEAU, HENRY IAN CUSICK, NAVEEN ANDREWS