Power of 10 (7 p.m., Ch. 2): Drew Carey hosts.

Just for Laughs(7 and 7:30 p.m., Ch. 4): Two new episodes.

Live from New York: The First Five Years of Saturday Night Live (7 p.m., Ch. 5): A behind-the-scenes look at the show's origins. (Repeat)

Nova(7 p.m., Ch. 7): "The Storm That Drowned a City" is a minute-by-minute retelling of what happened to New Orleans when Hurricane Katrina struck. (Repeat)

Big Brother 8 (8 p.m., Ch. 2): Houseguests compete.

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P.O.V. (9 p.m., Ch. 2): "Libby, Montana" tells the story hundreds of people who are sick or have died from exposure to asbestos in the small town.

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