The Sing-Off

The Sing-Off
8/7c NBC
NBC's holiday singing competition wraps up its second season tonight after two weeks of spirited performances by some of the country's top a cappella groups. In the finale, the winning group — which receives $100,000 and a Sony Music recording contract — is named, and surprise special guests perform. — Brie Hearn

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Martha and the Christmas Tree
7/6c Hallmark
Martha Stewart fans who think they've seen it all will want to tune in tonight as the style maven further expands her horizons, this time appearing in animated form. In this holiday special, a pint-sized Martha taps into her creativity and DIY attitude to help her friends prepare for a tree-decorating contest. — Brie Hearn

Million Dollar Money Drop

8/7c Fox
Fox is clearing much of its prime-time schedule this week for this new game show from the producers of Deal or No Deal, in which teams of two contestants get the money ($1 million in $20 bills) first, then must answer the questions. "You can touch it. You can feel it," host Kevin Pollak tells a young couple saving for their wedding. In fact, they must touch it — to move it to squares corresponding to their answers to the questions Pollak poses, which of course get harder as the game progresses. And the squares? They're trap doors. Get the question wrong and say good-bye to the loot. The program continues nightly through Thursday. — Paul Droesch

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Monday Night Football
8:30/7:30c ESPN
The torn Metrodome roof forced this Bears-Vikings game into a fluid state, with a neutral indoor site necessary if the outdoor stadium on the University of Minnesota campus isn't deemed NFL-ready. That would be a letdown to a whole generation of fans only familiar with pro football in Minneapolis from NFL Films and YouTube. Chicago (9-4) would be happy to dodge such a frigid spectacle in enemy territory as it zeroes in on an NFC North title few pundits saw coming. Minnesota (5-8) may not be quite so hospitable, meanwhile, with interim head coach Leslie Frazier — a former Bears defensive back — sure to motivate his club no matter where the game is played. — Roger Leister

Independent Lens
9/8c PBS
Tonight and tomorrow, "The Calling" profiles the next generation of religious leaders in America. The documentary, which follows seven young Catholic, Protestant, Jewish and Muslim Americans to their first days in their religious vocations, explores what draws young people to serve their faiths, and examines the sacrifices they make to do so. — Jeff Gemmill

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The Closer
9/8c TNT
Season 6 of the top-cop series continues with the first of a two-parter tonight. 'Tis the season to get sleuthing when a feud results in a stabbing on Christmas Eve and the death of a patriarch, a turn of events that could ruin the squad's holiday plans. Particularly irked is swell belle Brenda Leigh Johnson, since her parents (Frances Sternhagen and Barry Corbin, in their recurring roles) have arrived for the holidays and come bearing major news. Mary McDonnell reprises her role as Capt. Raydor. The conclusion airs next Monday. Of note, bittersweet news surrounds The Closer: While the series will return for a seventh season, TNT has officially announced it will be its last. — Dean Maurer

True Life
10/9c MTV
Now in its 22nd season, MTV's Emmy-winning documentary series continues to shed light on compelling issues affecting young people. In this installment, cameras follow three albino teens who were born with no pigment in their skin, hair or eyes, documenting the unique challenges they face while trying to fit in with their peers and lead normal lives. — Karen Kelty