A 12th season starts for “The Biggest Loser” (NBC, 8 p.m.), with the contestants divided by age. Trainer Bob Harper, right, is the only holdover trainer. He’s joined by Dolvett Quince and, surprisingly the former tennis star and cover girl Anna Kournikova, who is no way as tough as Jillian Michaels. Alison Sweeney, second from left, returns as host.

Secrecy surrounds the third season premiere of “Glee” (Fox, 8 p.m.), but it’s the start of a new school year and there is some disclosure right away as to who is a senior now and who is a junior.

“One of the most popular dramas in television, “NCIS” (CBS, 8 p.m.) returns for its ninth season, which will begin with uncovering the leak that Michael Weatherly’s DiNozzo found in last season’s cliffhanger. It’s immediately followed by the nearly as successful spinoff “NCIS: Los Angeles” (CBS, 9 p.m.), which begins its third season by continuing the search for Linda Hunt, who may be out looking for a movie role somewhere.

The solid new show “New Girl” (Fox, 9 p.m.) (see fall preview above) is the lead-in for the second season start for “Raising Hope” (Fox, 9:30 p.m.), in which Jimmy shows off his singing tournament.

For its own second season, “Body of Proof” (ABC, 10 p.m.), the Dana Delaney vehicle about a medical examiner, has moved from Providence to Los Angeles in depicting that show’s locale: Philadelphia. The case tonight is an automobile crash.

So many deserving people could be voted off of “Dancing with the Stars” (ABC, 9 p.m.) in its first week. Before that happens, Harry Connick Jr. and L.M.F.A.O. perform at the season’s first results show, but probably not together. It’s preceded by a recap of last night’s dances at 8 p.m.

“Ringer” (The CW, 9 p.m.), the most ridiculed new show of those dismissed last week (“H8R” just won contempt), has made it to its second episode. And there’s a new, second episode of “90210” (The CW, 8 p.m.) now located at college, where Naomi and Annie are rushing a sorority.

After premiering last night at midnight, the absorbing history lesson “The Strange History of Don’t Ask, Don’t Tell” (HBO, 8 p.m.) reruns at a more civil hour in primetime.

A two part special, “Big Hair Alaska” (TLC, 10 p.m.) looks at the salon that created Sarah Palin’s puffy hairdo.

In a new episode of “Sons of Anarchy” (FX, 10 pm.), snubbed at the Emmys, sees some shrinkage of the club’s goods.

Amber and Gary of “Teen Mom” (MTV, 10 p.m.) may be a more boring on-again, off-again couple than Sammi and Ronnie.

The monthlong survey of Kirk Douglas films on Turner Classic Movies continues with his portrayal of Vincent Van Gogh in “Lust for Life” (8pm.), Stanley Kubrick’s “Paths of Glory” (10:15 p.m.).as well as “Last Train from Gun Hill” (midnight), “The Devil’s Disciple” (1:45 a.m.), “Town Without Pity” (3:15 a.m.) and “Two Weeks in Another Town” (5:15 a.m.).

Daytime Talk

Regis and Kelly: Julianna Margulies, Paula Abdul, Anna Kourikova. The View: Forence Henderson, Daphne Oz. Ellen DeGeneres: Christina Applegate, Kathy Bates, Demi Lovato. Wendy Williams: Ronnie & Sammi from “Jersey Shore,” Jeremy Kyle.

Late Talk

David Letterman: Jonah Hill, Paula Abdul, Coldplay. Jay Leno: Gerard Butler, Whitney Cummings, Kelly Clarkson. Jimmy Kimmel: Simon Cowell, Gavin DeGraw. Jimmy Fallon: Dana Carey, Demi Lovato, Clap Your Hands Say Yeah. Craig Ferguson: Harry Connick Jr. Tavis Smiley: Danny Glover. Jon Stewart: Ron Suskind. Stephen Colbert: Jeffrey Kluger. Conan O’Brien: Simon Baker, Bryce Dallas Howard. Chelsea Handler: Moshe Kasher, Sarah Colonna, Ross Mathews.