TONIGHT'S MUST-SEE

"quarterlife" debut, 9 p.m., NBC. One of TV's great teams, Marshall Herskovitz and Ed Zwick, again pulls us inside complex characters. Dylan is a little like Angela in "My So-Called Life." She's bright and caring; she's at the edge of life, almost fitting in. The difference is that she's in her 20s, with a new way to be express herself. With her computer camera, she blogs about her life and her roommates. Two want to be filmmakers, one an actress. Their lives and romances interlock. This series was made on a tiny budget, but it has the great writing and camera work Herskovitz and Zwick have offered since "thirtysomething." The actors are unknowns. Bitsie Tulloch is great as Dylan.

"Jericho," 9 p.m., CBS. Things are turning darker. Maj. Beck, a decent sort, has been brushed aside and a company man is in charge. Also a fierce disease is advancing. Townspeople scramble, in a strong hour.

OF NOTE

"American Idol," 7 p.m., Fox. It's the guys' turn now. With the field trimmed from 12 to 10 — and with the early introductions taken care of — the show trims back a half-hour, to 90 minutes.

"The Biggest Loser," 7 p.m., NBC. We're down to eight contestants now. One team gets a trip to Las Vegas; it will have to resist temptations there or fail in the weigh-in.

"According to Jim," 8 p.m., ABC. Jim gives away the baby clothes and furniture — then gets a phone call that makes him realize that was a mistake.

"Back to You," 8:30 p.m., Fox. This excellent comedy was one of the first shows to disappear when the writers strike began. It won't be back until April 16, but Fox did have two leftover episodes, which it airs now and tomorrow. Tonight, Kelly (Patricia Heaton) is supposed to give a eulogy for a former colleague who had claimed they had a relationship. Chuck (Kelsey Grammer) uses the time to bond with their daughter, Gracie.

"In Treatment," 7:30 p.m., HBO. The calm facade collapses for Paul, the therapist, when Alex (Blair Underwood) breaks through his barriers. We begin to see how troubled Paul is.

"What Would You Do?" 9 p.m., ABC. After a preview run Friday, this five-part series settles in. The show creates unusual situations, then uses a hidden camera to see reactions.