TONIGHT'S MUST-SEE

"Last Comic Standing," NBC, and "So You Think You Can Dance," Fox, season finales, both 7 p.m. On the final day before the Olympics, shows rush to name winners. It will be a standup comedian on NBC, a dancer on Fox, a commotion on both. The votes are already counted, so there's time to fill. Each show will have previous contestants, plus other guest stars. Fox is expected to have dancers (including a duel between two street dancers) and musicians. NBC will load up on comedy — Jon Lovitz, Penn and Teller, Gilbert Gottfried, Joel McHale and last year's winner, John Reep.

OF NOTE

"Ugly Betty," 7 p.m., ABC. Claire's on trial for killing Fey Sommers. Meanwhile, a perfume Fey created has a bizarre effect on Betty and Henry.

"America's Got Talent," 8:30 p.m., NBC. Here's one reality competition that will be back after the Olympics. Tonight is the second half of the Las Vegas callbacks. Then "Talent" will rest a while; when it returns Aug. 26, it will do two (and sometimes three) shows a week until its Oct. 1 finale.

"Grey's Anatomy," 8 p.m., ABC. This rerun has big, melodramatic moments. Lexie keeps one patient alive by hand; Rose rescues another by fixing a computer; and Meredith struggles to save a paramedic. Still, the highlight is the subtly layered portrayal of George (T.R. Knight). He shows rich humanity while dealing with Bailey's husband and with her white supremacist patient.

"CSI: Crime Scene Investigation," 8 p.m., CBS. Grissom returns and finds his temporary replacement (Liev Schreiber) in ethical trouble. On a murder case, the guy failed to mention that he knew the victim and the cop who found the body.

"Flashpoint," 9 p.m., CBS. A botched bank robbery leads to a hostage crisis.