LOST - "Raised By Another" - Jack, Kate and Charlie wonder if Claire's disturbing nightmares might be coming true to threaten her life and the life of her unborn child, and a missing castaway returns with frightening news about what lies just beyond the mountains, on "Lost," WEDNESDAY, DECEMBER 1 (8:00-9:01 p.m., ET), on the ABC Television Network. (ABC/MARIO PEREZ) EMILIE DE RAVIN, KEIR O'DONNELL