"Duel" finale, 7 p.m., ABC. Yes, there are flaws to this game show. The questions are poor, the look is drab and the pace is maddeningly slow. Still, the concept is excellent: A contestant starts a round with 10 markers; he can cover all four possible answers if he wants — but he'll lose the three that are wrong. Or he can gamble by trying three, two or one. That's fought by an interesting mix of people. Tomorrow, this six-night tournament concludes, with more than $1 million at stake.

"In God's Name," 8 p.m., CBS. When was the last time you saw a network give prime time to a serious discussion of God, man and the meaning of life? That's what CBS does here. Working with Jules and Gedeon Naudet — producers of the acclaimed "9/11" documentary movie — it interviews 12 religious leaders. There are two Americans, Frank Page (Southern Baptist) and Mark Hanson (Evangelical Lutheran), plus Pope Benedict XVI, the Dalai Lama and more.

OF NOTE

"The 100 greatest Songs of the 90s," 3 p.m., VH1. Here's the entire series in one burst. Alongside the clips, there are interesting personal recollections, plus a look at what happened to the people who fell from view.

"Elmo's Christmas Countdown," 6 p.m., ABC. Poor, sweet Elmo is distressed; if the countdown doesn't proceed, he's told, Santa won't show up. A lot of goofiness follows, much of it fun for kids or grownups; along with it, there are seasonal songs. Some are so-so — even Brad Paisley can't do much with "Jingle Bells" — but there are fine moments from Alicia Keys, Sheryl Crow, Jennifer Hudson and more.

"The Simpsons," 7 p.m., Fox. In this rerun, Marge feels guilty about the fact that Gil is jobless and homeless. She invites him for dinner, then can't get rid of him.

"Spider-Man 2" (2004) 7:30-10 p.m., Fox. Here's a zesty action film the family can watch — if it doesn't mind some bursts of violence. Alfred Molina plays the tortured Dr. Octopus.

"Nature: Christmas in Yellowstone," 8 p.m., PBS. For 26 years, writer-photographer Tom Murphy has visited the winter beauty of Yellowstone Park. Here's a gorgeous documentary, superbly shot in high-definition.

"Masterpiece Theatre: Prime Suspect: The Final Act," 9 p.m., PBS. This rerun has Helen Mirren in her final performance as Jane Tennison, the London police detective. It's a tough, wrenching and Emmy-winning performance. Struggling with alcoholism and despair, Tennison wants to solve one more case, the murder of a teenager. She bonds with a troubled teen, beautifully played by Laura Greenwood.

"The Santa Clause 2" (2002), 8 p.m., ABC. The new Santa (Tim Allen) must quickly find a wife. His existence depends on it, quite literally.

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