Dancing with the Stars (8pm, ABC) - The new cast is introduced tonight, along with their professional partners. The eleven couples perform either the Viennese Waltz or the cha-cha. That's Kate Gosselin on the left. Is she wearing a wig?

Chuck (8pm, NBC) - Chuck's future as a spy rests on one final test mission in which he's called upon to terminate his target.

How I Met Your Mother (8pm, CBS) - Ted wrecks Lily's birthday party by bringing the heiress to the Massengill fortune along as his date. That's right, Laura Prepon guest stars.

Law & Order (10pm, NBC) - Four cops are shot and by the time the case gets to trial, the police force is pitted against the prosecution. 

Castle (10pm, ABC) - In part one of a two-parter, Beckett and Castle work with a federal agent to track down a crafty serial killer. Dana Delaney guest stars, making it reunion time with her "Desperate Housewives" husband Nathan Fillion (remember how they wasted him on that show??). 

Nurse Jackie (10pm, Showtime) - The hilarious "Nurse Jackie" is back for Season Two. Read all about it. The second season of "The United States of Tara" (starring Toni Collette) follows at 10:30.

Chuck (8pm, NBC) - Is Casey (Adam Baldwin at right) going rogue? After he performs a side mission for his old boss, he lands in prison for treason and Chuck and Sarah try to break him out. "Chuck" has been all about the surprises so far this season, but a surprise I can not get behind is removing Casey from the equation. 

20/20 Inside the Bachelor: Stories Behind the Rose (8pm, ABC) -  This venerable news show takes a hard, investigative look at the inner workings of the popular reality shows "The Bachelor" and "The Bachelorette." Oh, who are we kidding. It's an inside job so expect nice, fluffy interviews with folks like Melissa Rycroft, Dr. Travis Stork, and Ryan & Trista.

Trauma (9pm, NBC) - Suspended Rabbit begins his mandatory therapy sessions just as things heat up between him and Nancy. Also, Glenn loses a patient during a routine procedure and a patient flees from Boone and Tyler's rig. NBC isn't promoting this show at all and the ratings are in the toilet. So when it gets canceled this time, it will stay canceled. I still like it.

Law & Order (10pm, NBC) - Cutter takes on his mentor (Amy Madigan) when she tries to overturn the conviction of a man found guilty of a hate crime, and a secret from Cutter's past may have an impact on the case. Anna Chlumsky also guest stars. The story appears to be based on the real-life Northwestern University Medill Innocence Project case. 

Damages (10pm, FX) - Forget the Tobins -- Arthur Frobisher (Ted Danson, left) is back to launch his new foundation.

The Bachelor (8pm, ABC) - In the finale, Jake must choose between the two remaining women -- or not (it's a good bet that he will pick neither). He's left with Tenley (who has ex-husband issues) and Vienna (who has daddy issues). Run, Jake! The new crew of "Dancing with the Stars" will be announced during the show, so there's that. And at 10pm, there's "After the Final Rose," which will introduce the new "Bachelorette" (worst kept secret in the world: it's Ali).

Chuck (8pm, NBC) - "Chuck" has been fantastic this season, but
the last episode turned things upside down a little bit. So tonight, in addition to Chuck's new spy assignment, we'll get to see him try to date Hannah (Stacy Keibler Kristin Kreuk) while Sarah tries not to date Agent Shaw (Brandon Routh). 

How I Met Your Mother (8pm, CBS) - CBS comedies are back from their Olympic-rerun-hiatus and they're still churning out celebrity guest stars. Tonight, on HIMYM, the gang thinks Ted is being strung along by a new woman, played by Carrie Underwood. On "Two and a Half Men," Charlie returns from Vegas with his new wife, but it's not Chelsea. Look for Stacy Keach and John Amos. On "Big Bang Theory," Sheldon misses a chance to meet comics mogul Stan Lee, who makes a cameo appearance, but misses seeing him because of Penny.

Law & Order (9pm, NBC) - NBC burns two back-to-back new episodes of "Law & Order," as they take their first stab at filling the "Jay Leno Show" 10pm void. 

Damages (10pm, FX) - Patty is under pressure to make progress on the Tobin case, so she strikes a surprising bargain. Also, Tom's financial pressures (i.e. "financial ruin") begin to get to him.

Law & Order (8pm, NBC) - In a twist on the Letterman blackmail story, Samantha Bee ("The Daily Show") plays a daytime talkshow host embroiled in scandal with connections to the murder of a freelance journalist.

Dollhouse (9pm, Fox) - Echo and the team travel to Arizona in an attempt to dismantle the Rossum Corporation's mainframe. Series finale is next week!

Medium (9pm, CBS) - Devalos revisits a past horror on the anniversary of his daughter's death, and Allison has dreams that shed new light on the mystery.

The Tonight Show with Conan O'Brien (NBC) / The Late Show with David Letterman (CBS) (11:35pm) - These two late night shows have been great all week, and things are unlikely to settle down any time soon. Watch one of these and tape the other. 

NBC has announced the shows which will fill the network's 10pm timeslot once they yank "The Jay Leno" show out of primetime (and after the Winter Olympics end):

Law & Order (8pm, NBC) - The disfigured body of a campaign workers is found with the word "FED" scrawled across his chest. Benjamin Bratt (left), who played Det. Rey Curtis from 1995 to 1999, returns tonight for one episode.

Dollhouse (8pm, Fox) - Two episodes tonight. First up, Echo is lost in the world-at-large while dealing with multiple-memory-downloads. Later, the murders of Echo's past romantic liasons may indicate the return of Alpha.

HALO Awards (9pm, Nik) - Four teenagers who have taken leadership roles in their communities are rewarded with scholarship money and other special perks. Hosted by Nick Cannon and featuring LeBron James, Alicia Keys, Hayden Panettiere, and Justin Timberlake.

Law & Order (8pm, NBC) - An elderly man is forced to defend his store from an armed robber, but Lupo and Bernard suspect an ulterior motive.

Ghost Whisperer (8pm, CBS) - Melinda worries about Aiden when he's befriended by the ghost of a little girl who died with leukemia.

Monk (9pm, USA) - Monk is finally reinstated to the San Francisco police force, and his first case, tracking down a serial killer, is more challenging than he anticipated. We see the return of Trudy tonight (Brooke Adams) and the show has promised us resolution on her murder, so expect developments on that. After this, only two episodes left. 

20/20 (10pm, ABC) - Another day, another Sarah Palin interview. 

Medium (9pm, CBS) - Allison rents an SUV with a satellite radio which picks up peoples' conversations. People who have committed murder, no doubt.

Law & Order (8pm, NBC) - Two new back-to-back episodes tonight. The first one is about the murder of a rich young woman with a connection to a drug cartel. The second one is about a suspicious drunk driving death and stars Rich Sommer, right (Harry Crane from "Mad Men."). This episode seems to be loosely ripped from the Diane Schuler case in Long Island which happened this past summer.

Monk (9pm, USA) - Monk on a camping trip should be something to behold. I'm immediately reminded of the classic "I hate nature" episode when Monk was a protected witness and forced to stay in a secluded cabin in the woods. If he has to sleep in a tent in this one, God help them all. 

White Collar (10pm, USA) - John Ventimiglia (whiney chef Artie Bucco from "The Sopranos") finally gets to play a real mobster. His characters asks the FBI to help him track down a Bible which was stolen from him. 

Instead of being crowded into obscurity by an overabundance of television crime shows, "Law & Order" has entered its 20th season like gangbusters, with some of its strongest episodes in years. The show is an institution, not only building and maintaining a loyal following over the past 20 years, but doing so despite innumerable cast changes that would have killed lesser shows.

Tonight the venerable crime drama takes on a topic to which it is no stranger: abortion. More specifically, the killing of doctors who perform them. But tonight, the episode (ripped from the headlines, of course) essentially becomes a moral debate which challenges the characters closest to the arrest and prosecution of the killer to reexamine their own beliefs.

We talked to the show's executive producer and head writer Rene Balcer this week about that episode and about other things, including the Lt. Van Buren cancer storyline and NBC's decision to drown viewers with reality shows and Jay Leno in prime time. Balcer, who is also the creator of "Law & Order: Criminal Intent," which currently airs on the USA network, told us that tonight's episode "turns conventional wisdom on its head."

Supernanny (8pm, ABC) - In the season six premiere, Jo encourages a couple to work on their relationship when a father dotes on his three biological sons, but doesn't get along with his teenage stepdaughter.

Law & Order (8pm, NBC) - A controversial episode in which a doctor who performs late-term abortions is murdered by a pro-life activist. This isn't the first time "Law & Order" has taken on the topic of abortion or the killing of doctors who perform them, but the moral debate within this episode is not as black and white as you may assume. Richard Thomas guest stars.

Dollhouse (9pm, Fox) - Sierra's introduction to the Dollhouse is revealed when she faces her connection to Rossum Corporation. Keith Carradine stars.

Monk (9pm, USA) - Sharona returns. Need I say more? Okay, okay. Sharona (Bitty Schram) returns to San Francisco to sort out some red tape after her uncle's death, but Monk suspects foul play. Investigating the uncle's death, Monk works with both Sharona and Natalie at the same time. Jack Wagner also guest stars.

White Collar (10pm, USA) - The latest quirky crime drama from USA features a charismatic con man who partners with the FBI to help solve white collar crimes to keep himself out of prison.