TONIGHT'S MUST-SEE

"American Idol," 7 p.m., FOX; and "America's Next Top Model," 4 p.m., UPN (KIKU). Viewers seem obsessed with competitions. "Idol" has its eight men perform. Tomorrow, it will trim to its 12 finalists — six male and six female. And "Top Model" introduces its new cycle, with 13 contestants. In the two-hour opener, it comes up with a fresh challenge. In the past, contestants have sometimes been virtually nude, but this is tougher in a way: They must be bald — or, at least, seem to be bald — during a photo shoot.

"Invasion," 9 p.m., ABC. Christina is on the run now with her boyfriend, Derek. She's young, pregnant and fiercely violent. Now two sometimes-enemies, Sheriff Tom Underlay and parks ranger Russell Varon, search for them. That plunges them into a tangled netherworld in the Florida jungle where they make disturbing discoveries. In the "Invasion" style, this hour is richly imaginative, beautifully filmed — and so complex that it's difficult for new viewers to join.

OF NOTE

"All We Are Saying" (2005), 6 p.m., Showtime. With few frills and great passion, this documentary movie takes a fresh look at musicians. Rosanna Arquette takes her cameras everywhere, talking to more than 50 musicians. Some are veterans (David Crosby, Stevie Nicks, Elvis Costello), others are from such modern groups as OutKast and the Black Eyed Peas. Alongside worries about the sluggish music industry, they offer bursts of optimism and idealism.

"The Biggest Loser: Special Edition," 7 p.m., NBC. Here's the start of a weight-loss competition among military wives.

"Still Standing," 7 and 7:30 p.m., CBS. The first episode has Bill's dad (Paul Sorvino) seeming uncharacteristically cheery before his wedding. The second has Bill and Judy preparing to remodel their son's room as soon as he leaves for college.

"The George Lopez Show," 7 p.m., ABC. Richard Lewis plays the therapist for Max's son after a school shooting.

"Freddie," 7:30 p.m., ABC. Everyone wants to find a guy for Grandma.

"Law & Order," 8 and 9 p.m., NBC. In the first hour, Jack McCoy's name is on a death list. In the second, a murder victim inexplicably had hundreds of thousands of dollars. His wife, lover and daughter are all suspects.

"Lost," 8 p.m., ABC. Here's a rerun of the hour that first viewed the criminal past of sweet-looking Kate. She and Sawyer tangle over a briefcase that contains something Kate wants.

"Black.White" debut, 8 p.m., FX, rerunning at 11. Some brilliant make-up work helps make a black family look white and a white family look black. They are interesting people, but the results of the experiment where both families trade races are elusive during this first hour. Some people feel they've made discoveries about how the other race lives and some dispute that. If nothing else, this diligent series will stir conversations.