TONIGHT'S MUST-SEE

"Lost," 8 p.m., ABC. So far in this strange season, "Lost" seems to be two separate shows. One involves the three captives, Jack, Kate and Sawyer. We return to them tonight. Jack, a doctor, is expected to treat an Other.

"Top Chef," 7 p.m., Bravo. It's always risky to wake people at 4:30 a.m. and give them sharp knives. That's what happens here in a fairly interesting sushi challenge The elimination round involves Korean and Vietnamese cuisine. Wrapped into this is a bizarre situation in which one food item isn't paid for. More bizarre is the way people dawdle before doing something about it.

OF NOTE

"The World Series," 2 p.m., Fox. Here's the fourth game (barring weather complications) of the best-of-seven series. We're in the National League park now, meaning designated hitters are out.

"Jericho," 7 p.m., CBS. People were premature about celebrating the return of electricity. Now an electromagnetic pulse fries everything that has a circuit board, and the town is plunged back into darkness.

"Dancing With the Stars," 7 p.m., ABC. Joey Lawrence and Jerry Springer face extinction anew. Last week, they were the bottom two, but the show decided not to eliminate anyone. Now all the scores from last week are added to this week.

"30 Rock," 7 p.m., NBC. Jack (Alec Baldwin) has a hand in everything. He arranges a blind date for Liz and infiltrates the writers' poker game.

"Twenty Good Years," 7:30 p.m., NBC. Jeffrey fears hospitals but might get private care because his basketball teammate, John, is a doctor.

"The Biggest Loser," 8 p.m., NBC. Contestants are asked to guess the calories in restaurant meals. The losing team must order takeout for three weeks.