Ugly Betty (7 p.m., Ch. 4): Wilhelmina returns to Mode.
Smallville (7 p.m., Ch. 30): Clark and Lex face off. (Season finale)
My Name Is Earl (7 p.m., Ch. 5): Billie gives Earl an ultimatum. (One-hour season finale)
CSI (8 p.m., Ch. 2): Did Warrick kill a gangster? (Season finale)
Grey's Anatomy (8 p.m., Ch. 4): Alex learns the truth about Rebecca.
The Office (8 p.m., Ch. 5): Michael throws Toby a big farewell party. (One-hour season finale)
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Supernatural (8 p.m., Ch. 30): Sam tries to save Dean from hell. (Season finale)
Without a Trace (9:01 p.m., Ch. 2): Five people are abducted. (Season finale)
Lost (9:02 p.m., Ch. 4): The battle begins.
ER (9:01 p.m., Ch. 5): Steve Buscemi guest stars as a drunken patient. (Season finale)