Gossip Girl (8pm, CW) - A busy Blair asks Serena to impersonate her at a meeting. Elsewhere, Ivy and Lola join forces to help Chuck exact revenge.

2 Broke Girls (8pm, CBS) - In a one-hour Season 1 finale, Max and Caroline attend a fashion gala at a museum where Martha Stewart is a guest, and they attempt to get the domestic maven to taste their cupcakes.

The Voice (8pm, NBC) - The remaining four vocalists compete in the final performances.

Top Gear (8:30pm, BBC America) - Ryan Reynolds appears in an episode in which Jeremy and Richard plan a film's climactic car chase.

House (9pm, Fox) - A Princeton-Plainsboro pathologist doesn't trust any of his colleagues to diagnose and treat him except for House, who is missing. So House's team must make the skeptical patient believe that House is actually directing his case.

Castle (10pm, ABC) - In the Season 4 finale, a military veteran's homicide leads Beckett to go after the man who shot her, and a concerned Castle wants to protect her from the danger she's facing.

Lost Girl (10pm, Syfy) - Kenzi drunkenly summons a witch to punish Dyson for how he treated Bo.

The Secret Life of the American Teenager (8pm, ABC Family) - Amy worries she might be pregnant fora  second time, and Ben tries to impress Dylan's parents. Also, George is puzzled by Anne and Nora's bonding.

2 Broke Girls (8:30pm, CBS) - Caroline helps Max prepare her first tax return, but in doing so, forgets to mail Earl's return.

House (9pm, Fox) - House and the team take on the case of a man who is bleeding from his eyes. Meanwhile, House's favorite hooker, Emily, is leaving the business to get married, so he teams up with his "wife," Dominika (Karolina Wydra, left), to sabotage Emily's relationship.

Eureka (9pm, Syfy) - In the Season 5 premiere, the Astraeus crew returns to Eureka four years later and must adapt to a myriad of changes, including a more oppressive version of Deputy Andy.

Smash (10pm, NBC) - Karen and Ivy team up to form an awkward alliance when movie star Rebecca Duvall (Uma Thurman) shows up for work.

Castle (10pm, ABC) - When things get tense with Beckett, Castle decides to team up with a new partner: a tough gang-unit detective who exposes him to a seedier side of police business and puts him in risky situations.

Bones (8pm, Fox) - Booth (David Boreanaz, left) and Brennan get help from Special Agent Genny Shaw in identifying the remains of an extreme couponer whose body was dragged by an 18-wheeler. Meanwhile, Brennan returns to work after having her baby.

Gossip Girl (8pm, CW) - Serena wants to pass her It-Girl torch to a hesitant Lola, whom she pressures to do a modeling gig at a lingerie show. Elsewhere, Chuck seeks Blair's guidance regarding his past.

How I Met Your Mother (8pm, CBS) - Speculations run wild as Ted, Barney and Marshall imagine what their lives would be like three years down the road.

2 Broke Girls (8:30pm, CBS) - Max and Caroline participate in a clinical drug trial to raise money to help Caroline's imprisoned father.

Smash (10pm, NBC) - A famous movie star (played by Uma Thurman) signs to do the show, but then gets stuck in Cuba.

Hawaii Five-0 (10pm, CBS) - Max believes that a serial killer who has ties to his past and is known as the Trashman is responsible for a recent murder. To convince the Five-0 that his theory is correct, Max reveals some some surprising information about his childhood.

Dancing with the Stars (8pm, ABC) - The 14th season begins with 12 couples dancing either the fox-trot or the cha-cha. Gladys Knight, Melissa Gilbert, and Martina Navratilova are among the dancers, but here is the full list of this season's competitors. Click below to see a photo of the full cast.

Pretty Little Liars (8pm, ABC Family) - The secret identity of "A" is revealed in tonight's season finale.

How I Met Your Mother (8pm, CBS) - The gang try to break up Barney and Quinn after learning that the couple plan to move in together.

2 Broke Girls (8:30pm, CBS) - Max and Caroline enjoy a spring getaway when they take care of a dog at a couple's ritzy apartment.

Alcatraz (9pm, Fox) - Musically inclined serial killer Webb Porter (relation to Cole?) resurfaces and causes trouble.

Hawaii Five-0 (10pm, CBS) - McGarrett's sister is arrested for allegedly smuggling $20 million in conflict diamonds. To clear her name, Steve enlists the help of a former diamond smuggler to set up a sting operation. Ed Asner reprises the role of smuggler August March, which he created on the original series, and footage from that 1975 episode is shown. In tonight's show, March is now out of prison after serving a 30-year sentence.

Smash (10pm, NBC) - The Marilyn musical is performed in front of a group of potential investors, and Ivy's confidence is weakened by her mom, a Broadway veteran. Also, repercussions await Julia and Michael.

Lost Girl (10pm, Syfy) - Bo probes a sex-related murder case with her new friend, Saskia.

The Bachelor (8pm, ABC) - It's back. California winemaker Ben Flajnik got rejected last season, so he's ordering up more manufactured public romance (and fabulous free trips!). One of the hopeful bachelorettes is Emily (right), a 27-year-old PhD student at UNC-Chapel Hill, so we'll pay attention for as long as she's on the show. You know, for the news value.

How I Met Your Mother (8pm, CBS) - Marshall visits his father's grave to carry on their tailgating tradition. Also, Barney and Ted open a bar and Robin fills in for a drunk news anchor.

2 Broke Girls (8:30pm, CBS) - Caroline becomes obsessed with collecting coupons and discovers the secret ingredient in Max's cupcakes.

It's a Brad Brad World (10pm, Bravo) -  The best part of "The Rachel Zoe Project" now has his own show. This reality series follows the adventures of Zoe's onetime assistant, Brad Goreski, as he embarks on a solo career -- with a limited budget and no assistant.

Rock Center with Brian Williams (10pm, NBC) - Harry Smith reports on boom farmland real estate. Also, the dangers of lobster diving, an interview with "Saturday Night Live" comics Fred Armisen and Darrell Hammond, and the process of cleaning Times Square after New Year's Eve.

Celebrity Wife Swap (10pm, ABC) - I wish I was making this up. Organized actress Tracey Gold swaps places with laid-back singer (i.e. "slob") Carnie Wilson in the first episode of this new reality show in which the matriarchs of two celebrity families swap spouses, kids and homes for a week.

American Country Awards (8pm, Fox) - Trace Adkins and Kristen Chenoweth host this fan-voted awards show in Las Vegas. Performers include Blake Shelton, the Band Perry, and ... you guessed it, Scotty McCreery!

How I Met Your Mother (8pm, CBS) - Robin hears bad news, but hides it from everyone, and Marshall hangs Christmas decorations with a little help from his neighbor.

Charlie Brown Christmas (8pm, ABC) - The 1965 Peanuts classic in which Charlie Brown laments the commercialization of Christmas. Jazz pianist Vince Guaraldi provides the music.

A Sing-Off Christmas (8pm, NBC) - Holiday songs are performed by winning groups from each season, an ensemble of lead singers from Season 3, and special guests.

2 Broke Girls (8:30pm, CBS) - Max and Caroline try to find their horse Chestnut a job so he will have lodging for the winter.

Prep & Landing 2: Naughty vs. Nice (8:30pm, CBS) - In a new holiday installment from Prep & Landing, an elf needs help troubleshooting a Christmas crisis after a mischievous kid hacks into Santa's database, so he reaches out to his estranged brother, who works on the coal squad.

The Closer (9pm, TNT) - Santa's zip-line arrival into a Christmas village goes very wrong and Brenda's team takes on the holiday case. Fred Willard guest stars.

Neverland (9pm, Syfy) - The conclusion to the two-part miniseries that serves as a prequel to the story of Peter Pan. If you missed last night's first part, it repeats tonight at 7.

The Sing-Off (8pm, NBC) - The groups collaborate to perform a medley of James Brown's "I Feel Good," the Jackson 5's "ABC," and Beyonce's "Crazy in Love." Later, the acts perform R&B tunes individually.

2 Broke Girls (8:30pm, CBS) - Max and Caroline are hired by Johnny's jealous girlfriend to make cupcakes for an art show featuring his work, but she has an ulterior motive in mind.

Bored to Death (9pm, HBO) - George (Ted Danson) and Ray (Zach Galifianakis) tag along when Jonathan is hired by an old college flame (Casey Wilson) and her father (Rene Auberjonois) to guard her family's wedding jewels. Meanwhile, the bursting of Ray's romantic bubble forces him to move in with George.

Gabby and Mark: Courage and Hope (10pm, ABC) - In a special edition of "20/20," Diane Sawyer interviews Rep. Gabrielle Giffords and her husband, astronaut Mark Kelly. In the report, Giffords talks about her rehabilitation following a shooting outside a grocery store near Tucson, Arizona, where six people were killed. The special includes video taken of Giffords in the hospital during her recovery process, archival footage, and interviews with her mother.

Hawaii Five-0 (10pm, CBS) - An unidentified body is found in the trunk of a stolen car following a high-speed chase, and homeless Danny settles in on Steve's couch.

How I Met Your Mother (8pm, CBS) - The friends recall their memories of Hurricane Irene and Barney tries to get out of wearing the ducky tie.

2 Broke Girls (8:30pm, CBS) - Granted this show has flaws (the racial stereotypes at the diner are beyond tiresome) but sometimes it's very funny. It's worth checking out, with fingers crossed they eventually burn down that diner and start fresh. Tonight, Max and Caroline (left) take an apartment-cleaning job to make extra cash, not realizing it's the apartment of a hoarder.

House (9pm, Fox) - A well-respected man (Jamie Bamber) collapses mysteriously, and while treating him the team discovers that he has been hiding secrets. Naturally. Meanwhile, Chase and Taub rejoin the team.

Bored to Death (9pm, HBO) - Jonathan and George try couseling to mend their relationship, but Jonathan thinks he might have better luck by investigating a rival's business practices. Meanwhile, Ray finds himself with an embarrassment of romantic riches.

Give Me the Banjo (9pm, UNC-TV) - A re-airing of the history of the banjo narrated by Steve Martin and hosted by Roseanne Cash.

Castle (10pm, ABC) - Castle, Esposito and Ryan go to Atlantic City to solve the murder of a New Jersey casino owner who was found in an abandoned New York City warehouse. While there, they have a bachelor party for Ryan.

The Sing-Off (8pm, NBC) - The 10 remaining groups perform guilty-pleasure songs before two acts are eliminated.

Terra Nova (8pm, Fox) - A "Sixer" girl seeks asylum in Terra Nova. Taylor suspects there's at traitor in the ranks and Mira schemes to reclaim a possession.

2 Broke Girls (8:30pm, CBS) - Max and Caroline throw a '90s-themed party at the diner to raise money for their cupcake business, but Caroline is horrified when her rich ex-boyfriend attends the party.

Bored to Death (9pm, HBO) - On the run from police, Jonathan and Ray turn to Howard (Patton Oswalt) for help with trying to find out who framed Jonathan for murder, while George runs interference for them in his own inimitable, marijuana-induced way.

Enlightened (9:30pm, HBO) - Despite being banished to a dead-end job in the basement of Abaddonn, Amy tries to impress a human resources representative with evidence that the company needs to redefine its mission. Elsewhere, Amy seeks to convince Levi to change his ways.

Castle (10pm, ABC) - An insurance investigator assists Castle and Beckett with a homicide case stemming from the theft of a costly sculpture, and a museum benefactor becomes one of the murder suspects.

Hawaii Five-0 (10pm, CBS) - The Five-0 investigates the murder of a volleyball coach and the probe leads the team to discover more bad news about Kono and her ongoing legal problems.

Terra Nova (8pm, Fox) - The two-hour premiere of the much anticipated adventure drama from Steven Spielberg. Jason O'Mara ("Life on Mars") stars as a Chicago cop from the 22nd century who travels 85 million years into the past to give his family a better shot at survival (the 2149 earth has become almost unlivable due to overpopulation and pollution). Not usually my kind of show, but I found the pilot to be really exciting. Here's my review. I say give it a shot.

Gossip Girl (8pm, CW) - In the Season 5 opener, Serena makes a big mistake at her new job in Hollywood. Later, Chuck and Nate meet up with her in LA, where Nate is captivated by an older woman (Elizabeth Hurley).

Hart of Dixie (9pm, CW) - A new series about a cold New York City doctor (Rachel Bilson) who moves to a small town in Alabama and gets a dose of humility. The pilot was shot in Wilmington, but should you watch? Adrienne says ...

Mike & Molly (9:30pm, CBS) - In the second season premiere, the engagement honeymoon is over when Molly starts wedding planning while Mike just wants to go fishing with the guys.

Weeds (10pm, Showtime) - In tonight's season finale, Silas is out for revenge against his mom, and there's a big showdown between Nancy and her sister.

The Big C (10:30pm, Showtime) - In this season finale, Cathy decides to run a marathon to honor her dearly departed Lee, and what awaits her at the finish line will upend her life.

Also tonight, "2 Broke Girls" (which is kind of funny!) moves into its regular 8:30pm timeslot (CBS), and new episodes of "Playbunny Club" (10pm, NBC) and "Castle" (10pm, ABC).