Parenthood

Parenthood
10/9c NBC
After a delay to mid-season and some casting swaps, the family drama based on Ron Howard's hit 1989 film finally premieres. In the opener, Lauren Graham's character, Sarah Braverman, decides to move back home with her parents, played by Craig T. Nelson and Bonnie Bedelia. The move thrusts single mom Sarah and her two kids into the midst of a big, colorful extended family. The well-rounded cast also includes Peter Krause, Monica Potter, Dax Shepard and Erika Christensen. — Brie Hearn

American Idol

8/7c Fox 
The Top 24 boldly strolled to center stage last week in their first live shows of Season 9, resulting in a sonic wave of uneven performances. While the female contingent showed promise and strength — inspiring Simon and Randy to predict that a female will win the Idol crown this season — too many of the men went flat and fell flat. Now without the services of the eliminated Joe Munoz and '70s throwback Tyler Grady, the remaining 10 male semifinalists must pick themselves up in tonight's performances. This all comes with an interesting little subplot, namely married judge Kara DioGuardi's super crush on sightly contestant Casey James.  — Dean Maurer

Lost
9/8c ABC
Gee, there's a lighthouse, too? So many loose ends. Messrs. Cuse and Lindelof do have 12 episodes left (including this one) to tie them up but, as Sayid heatedly puts it to Dogen: "I want some answers!" Of course, Sayid says most things heatedly, or at least intensely, and he certainly does have issues with Dogen. At least Sayid also gets a tender Nadia interlude (and let's hope there's not yet another replay of her hit-and-run demise). Meanwhile, back at the temple, this season's batch of Others will have to deal with Claire. — Paul Droesch

Nova
8/7c PBS
Since astrophysicist Neil deGrasse Tyson first led the push to strip Pluto of its planetary status in 1999, a quest that rocketed to reality in 2006, he's been in the crosshairs of angry elementary students, space fanatics and noted Pluto booster Stephen Colbert. In this episode, he sets out to learn just why the tiny (by intergalactic standards) hulk of rock has attracted such a fanatical following. And, yes, the doc features Colbert, as well as Jon Stewart, Diane Sawyer and Brian Williams. — Jeff Gemmill

Southland
10/9c TNT
The second season starts on its new network soon after the cliff-hanger ending that left Russell bullet-ridden. Lydia is in denial about Russell and reluctant to move on, but she's assigned to work with Rene Cordero (Amaury Nolasco), a flashy detective with a hunger for the limelight. Chickie, who has lost the respect of her comrades after snitching about Dewey's drinking problem, is saddled with the department slacker. Meanwhile, Ben, almost finished with his training, waits for the Captain to sign his book. — Rhoda Charles