TONIGHT'S MUST-SEE

"So You Think You Can Dance," 7 p.m., Fox. The summer's best series has its final showdown tonight. On Monday, the field was sifted to four. Now each person dances several times, alone or in duos. Then viewers choose a winner, to be announced tomorrow.

"Knights of Prosperity" (7:30 p.m.) and "The Nine" (9 p.m.), both ABC. Let's give ABC credit for letting both shows — interesting, complex, near-misses — finish their new episodes. The "Knights" guys have stolen Ray Romano's safe, but new questions arise. Can they open it? Can they hire a safecracker? And is there really a big diamond ring inside? In "The Nine," Egan mentions on an interview that the former hostages are being watched. That brings a fresh fuss of media attention.

OF NOTE

"Power of 10," 7 p.m., CBS. This game settles into its regular slot. It's fun to guess how people responded to a poll.

"According to Jim," 7 p.m., ABC. After arguing with his claims representative, Jim finds himself without health insurance. Trying to hide the fact, he gets in more trouble.

"Rescue Me," 7 p.m., FX. Janet takes desperate measures to get the baby back. Meanwhile, Tommy is becoming obsessed with the mystery woman at the restaurant (Gina Gershon). Also, the Gavin family holds an intervention.

"Jump In" (2007), 8 p.m., Disney Channel. Disney continues its musical-each-night run, aiming toward Friday's "High School Musical 2" debut. Corbin Bleu, who co-stars in the high school films, stars here as a boxer who reluctantly joins a jump-rope combination. The result is bouncy, breezy fun.

"Last Comic Standing," 8 p.m., NBC. Last week, the show's complex rules left only two comedians, not three, in the showdown. Matt Kirshen, the clever London comic, won; Debra DiGiavanni, a Canadian, was ousted. That leaves seven people; tonight has a "speed laugh" challenge.

"CSI: NY," 9 p.m., CBS. In a rerun, three women dress as the lead character in "Breakfast at Tiffany's" and rob a jewelry store. Maybe they didn't understand the book.