Survivor (7 p.m., Ch. 2): One of the contestants suffers a health crisis and is flown off the island to seek medical attention. Will that contestant be out of the game for good?

Everybody Loves Chris (7 p.m., Ch. 24): Chris convinces his parents that he needs to take karate lessons. And (coincidentally?), NBC repeats an episode of The Office (8:30 p.m., Ch. 5) in which Dwight and Michael fight a karate battle.

Smallville (7 p.m., Ch. 30): Lionel is taken hostage and forced to play a series of elaborate games to stay alive.

The O.C. (8 p.m., Ch. 13): Ryan, Seth, Summer and Marissa attend their college orientations.

Supernatural (8 p.m., Ch. 30): Sam and Dean's father shows up and the three of them do battle with vampires.

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Without a Trace (9 p.m., Ch. 2): A wealthy young man disappears while volunteering at a homeless shelter.

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