Community (8pm, NBC) - The Season 2 finale concludes last week's paintball storyline. The study group unite to take down new intruders and common enemies during the intense battle.

The Vampire Diaries (8pm, CW) - The second season ends with lives hanging in the balance as the consequences of the sacrifice ritual become clear. Meanwhile, during a town square viewing of "Gone with the Wind," Damon recalls memories of Katherine in 1864.

American Idol (8pm, Fox) - One of the remaining singers is voted off (the suspense!) and judge Steven Tyler premieres his solo music video "(It) Feels So Good." Also, Season 6 winner Jordin Sparks performs.

CSI (9pm, CBS) - The 11th season concludes with Ray facing serial killer Nate Haskell (Bill Irwin) after he is lured to the house where Haskell's killing spree began.

The First 48 (9pm, A&E) - A Charlotte man is murdered in front of his 9-year-old son.

Bones (9pm, Fox) - Booth puts all his energy into apprehending Jacob Broadsky after an innocent victim is hit by the sniper's bullet, which was meant for Booth.

Parks and Recreation (9:30pm, NBC) - Two new episodes tonight! In the first, Leslie tries to get Ann a job at city hall, which leads to their first fight. Then, Leslie struggles to contain her feelings for Ben when they start out on a road trip to Indianapolis.

The Office (8pm, NBC) - NBC has a full night of 'The Office' -- six straight episodes. All repeats.

American Idol (8pm, Fox) - In fact, essentially everything on network TV is a rerun tonight, so you might as well watch the 'American Idol' results show and find out if Scotty McCreery got enough votes to continue his quest. Also tonight, J Lo premieres her new music video, "On the Floor."

The First 48 (9pm, A&E) - Two men are shot in a motel in Charlotte.

Fairly Legal (10pm, USA) - A big client asks Kate (Sarah Shahi) to mediate a simple financial matter, which quickly morphs into a case of identity theft before escalating to an immigration issue where Kate must defend a brave soldier (Christa Vidal) against a rigid Homeland Security prosecutor (Robert Moloney). Belita Moreno and Peter MacNicol also guest star.

Jersey Shore (10pm, MTV) - With so little on TV tonight, I guess it won't kill me to mention 'Jersey Shore.' There. I mentioned it. In other Death of Civilization news, Snooki is on the cover of Rolling Stone magazine.

The Bride Was Seven (10pm, Oxygen) - Lisa Ling travels to Ethiopia to report on child marriage, relating the stories of girls and young women who are bravely attempting to avoid being forced into early marriages.

Big Bang Theory (8pm, CBS) - Leonard has a great idea for a smartphone app, but it causes friction with Sheldon.

The First 48 (9pm, A&E) - A double murder in Charlotte is investigated.

Grey's Anatomy (9pm, ABC) - A mass shooting at a nearby college reopens some fresh wounds at the hospital. Also, Airzona returns to a cold welcome from Callie and Teddy proceeds with her marriage to the cute-but-dying-with-no-health-insurance Henry (Scott Foley).

The Facebook Obsession (9pm, CNBC) - Lester  Holt examines Facebook, including its rapid growth and the ongoing concerns over privacy policies. The report also includes good and bad stories from users.

Private Practice (10pm, ABC) - JoBeth Williams guest stars as Addison's mom, who shows up demanding that Addison save her dying partner (Ann Cusack).

Big Bang Theory (8pm, CBS) - Penny asks Leonard to lie to her visiting father, played by Keith Carradine, while Howard, Raj, and Bernadette spend all night looking through a telescope.

Bones (8pm, Fox) - An eccentric candy mogul (Wayne Knight) is under suspicion when human remains are found in the world's largest chocolate bar, but the tale of how they got there is just as puzzling as the victim's mysterious life.

Community (8pm, NBC) - Dean Pelton catches Jeff listing a fake class on his schedule, but then a mysterious professor (Kevin Corrigan) emerges to back up Jeff's claim. Curious about the man, Jeff and Annie investigate. Elsewhere, Abed and Troy build a blanket fort of great proportions.

Grey's Anatomy (9pm, ABC) - Haters will always hate, but "Greys" has hit a nice stride this season, and they've had some really good episodes. Tonight, the attendings go to Joe's to celebrate Derek's clinical trials grant, and are surprised to find a familiar face behind the bar. Meanwhile, Meredith and Alex must deal with a 9-year-old's postsurgical complications and his very demanding mother.

First 48 (9pm, A&E) - A body is found buried in a basement and the person who tipped the detectives could be the killer. Also, a father of three is stabbed to death in Charlotte.

Biography: Billy Joel (10pm, Bio) - A profile of Billy Joel, whose pop classics in the 70s and 80s made him one of the best-selling recording artists in American music history.

Burn Notice (10pm, USA) - A dangerous thief tries to steal a chemical weapon from Venezuelan revolutionaries, forcing Michael to work with his foe to prevent a disaster.

Vampire Diaries (8pm, CW) - Katherine's past is explored in 1490 Bulgaria, and Damon tries to uncover the real purpose of the mysterious moonstone.

Community (8pm, NBC) - Everyone is a suspect when Annie's favorite pen goes missing, so the group lock themselves in until the thief is found. Jeff heads up the investigation but Abed and Troy (left) aren't as invested in the mystery because they want to go to a nearby puppy parade.

30 Rock (8:30pm, NBC) - Jack manipulates a congressional election to help a candidate (John Slattery, "Mad Men"), thereby leveraging an advantage for the network. Meanwhile, a perfect pair of new jeans gives Liz confidence.

Grey's Anatomy (9pm, ABC) - The surgeons work to save a dying Middle East political figure amid tightened security at the hospital. Also, Alex makes a bad first impression on a new pediatrics attending (Peter MacNicol) and Cristina decides to decorate her new place and throw a housewarming party.

The First 48 (9pm, A&E) - Detectives in the terrifying crime mecca of Charlotte, North Carolina, investigate the murder of a man who was shot behind his girlfriend's house. Charlotte is one of the cities regularly featured in the current season of "The First 48."

Burn Notice (10pm, USA) - In the midseason return, Michael (right) tries to prevent a bombing arranged by a lawyer out for revenge against a local gang. Elsewhere, Michael and Jesse must track down a highly sensitive document that has been stolen.