TONIGHT'S MUST-SEE

"America's Got Talent" finale, 8 p.m., NBC. On Wednesday, the nine finalists got their last chance to perform. Then viewers voted. Now we learn who won. "Talent" can be silly, but the finale gives someone fame and $1 million.

"Grey's Anatomy," 7 p.m., ABC. Just as "Grey's" began creating an episode to follow the Super Bowl, it got an unusual request: Could this be two parts and two hours, instead of one? Could it have the same beginning and end, but lots of extra stuff in the middle? Remarkably, it could. As directed by Peter Horton, it's compelling. The hospital is already in crisis, with Dr. Bailey ready to have her baby as her husband undergoes surgery. Then a patient arrives with a bomb inside him. There are powerful moments involving two of the emergency people, played by Christina Ricci and Kyle Chandler. And some of the most telling reactions come after the crisis. The result is terrific television, worth seeing again.

OF NOTE

Football, 2 p.m., Fox. The Kansas City Chiefs visit the New York Giants.

"The Ron Clark Story," 6 p.m., TNT; reruns at 8. If you missed this upbeat movie Sunday, catch it now. Matthew Perry stars in the true story of a small-town teacher who stepped into a tough, New York City classroom.

"Eagles Farewell I Tour," 6 p.m., Bravo. Back in 2003, the Eagles launched what they cleverly called the Farewell I Tour. That's in its third year now. This performance was taped in Australia and aired June 1 on NBC.

"Big Brother: All-Stars," 7 p.m., CBS. It's time for another person to be eliminated.

"My Name is Earl," 7 p.m., NBC. After helping someone by temporarily taking his fast-food job, Earl sees the inequity of life: His evil boss has a big house and a hot wife. Why isn't karma working?

"It's Always Sunny in Philadelphia" season finale, 7 p.m., FX. Until now, Dennis and Dee — both long and lean — have never doubted that little Frank (Danny DeVito) is their father. Now come surprises, in a perversely funny episode with Stephen Collins as guest star.

"The Office," 7:30 p.m., NBC. This will be an episode chosen by viewer vote.

"Ace of Cakes" debut, 7:30 p.m., Food Network. Duff Goldman is a chef who is also a cake decorator, rock musician and power-tool buff; some of his cakes even move and shoot fireworks. This reality show follows his life.

"CSI: Crime Scene Investigation," 8 p.m., CBS. At least three people in a small-town family were killed, but there's disagreement on whether the fourth might be alive.

"Windfall," 9 p.m., NBC. When Cameron and Nina were in a car accident, their spouses realized they were having an affair. Tonight, there are aftershocks; also, Sean learns about Zoe's killer. Damien serves divorce papers on his Russian bride, then feels sorry for her.

"Without a Trace," 9 p.m., CBS. Two cases illustrate the difference in attention to a black victim and a white victim.