LOST - "White Rabbit" - Jack is near delirious from lack of sleep and struggles to overcome the haunting events that brought him to Australia and, subsequently, to the island. Meanwhile, Boone gets caught in a treacherous riptide, the pregnant Claire's health takes a bad turn, and a thief may have stolen the last bottles of water. Veronica Hamel ("Hill Street Blues") guest stars as Jack's mother, on "Lost," WEDNESDAY, OCTOBER 20 (8:00-9:00 p.m., ET), on the ABC Television Network. (ABC/MARIO PEREZ) EVANGLINE LILLY, IAN SOMERHALDER, DOMINIC MONAGHAN