Gibbs teams up with FBI Agent Fornell on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling, gets involved. Meanwhile, rumors run wild among the group after Diane stays overnight at McGee’s.

Like the Mayans, Virginia is convinced that the world is going to end on December 21, 2012, so she uses her extreme couponing skills to stock up on supplies and forces the family to train for the apocalypse. Meanwhile, Jimmy is determined to give Hope the best Christmas he can, since it will likely be the first one she remembers and Maw Maw tries to knock a few more items off her bucket list before the end of the world.

Zoe finds herself anxious that her ever-critical mother will be visiting BlueBell soon for the holidays. In order to avoid spending quality time with her mother, she busies herself with a patient but potentially ruins Christmas Eve for the whole town. Trying to fix the problem, Zoe upsets Wade by turning to his dad. Meanwhile, Lavon is desperate to make the week special for Ruby, but his plan goes awry when Lemon gets involved. Elsewhere, George is struggling with picking out the perfect present for Tansy.

Two artists are eliminated in a results show.

Les and Ashley debate the value of an old bike, while Seth has his hands full with a troublesome Jersey guy. Later, a woman wants more TV than she can handle.

The NCIS: Los Angeles team investigates the strange and brazen heist executed by gunmen in costumes that could directly impact the U.S. economy. Meanwhile, as Deeks testifies on a case, Granger insists on partnering up with a very reluctant Kensi.

When a microbrewer is murdered, the virtual world and real world meet head-on. Jane and the rest of the team mentor underprivileged teenagers. Angela starts a new romance.

Jane and Alex's parents plan a huge party to celebrate the 20th anniversary of the family mattress business. Jane struggles for a joke to make her humorless dad laugh for her toast, while Alex quietly informs Dave that she hasn't told her mom and dad that they're back together. Max, feeling left out now that Penny's relationship with Pete is going so well, looks for a new BFF to replace her.

When the gang attempts to juggle multiple holiday parties in one night, Jess tries to avoid a remorseful Sam, Nick tries to keep up with a sexually adventurous Angie and Winston panics when he gets a cranberry stuck in his ear.

Tia and Tamera comment on moments from the series.

A trip to Mission Hills, Cal.

The Amish Mafia provide protection for their people and deliver righteous justice against those who stand in their way.

The premiere day of "Dancing with the Stars" has finally arrived and James is in LA in prime dancing form, while Chloe is back home taking some liberties with James' empty penthouse with one of her infamous scams. June tries to step in and teach Chloe the importance of honesty... that is, until her own belief system is shaken. And when James finally step into the spotlight, mouths will drop.

When Mindy throws an office Christmas party at her apartment, she is eager for her colleagues to finally meet her boyfriend, Josh, but her plans go awry when she discovers a secret that Josh has been hiding. Meanwhile, Jeremy deals with doling out the office holiday bonuses, much to everyone's chagrin.

Jarrod and Brandi make a surprising discovery.

Artists go toe-to-toe with Oliver; in the portrait challenge, tattoos of some family members are unrecognizable; and an artist must close up shop.

During a dark moment in his life, Sheldon finds happiness with a new woman. Meanwhile, he becomes increasingly suspicious about his patient Nick's involvement in Sarah's disappearance.

The team cons a corrupt winery owner out of a priceless bottle of wine.

The holiday incites a mix of emotions as Adam and Kristina experience a health scare while Crosby and Jasmine celebrate their first Christmas together as a family. Sarah is torn between her feelings for Mark and her evolving relationship with Hank. Amber and Ryan face challenges in their relationship. Meanwhile, Zeek helps to restore belief in a childhood hero.

When a young Vegas showgirl is attacked and murdered, the Lambs work to track down the killer, realizing early on that there’s something about the case that resonates personally with Katherine. Meanwhile, Savino manages to land a high roller at the Savoy and tries to use him to show other “whales” that the Savoy is a real contender for high stakes gambling.

Laura Linney

Chris O'Dowd, Graham Parker & the Rumour

Malcolm Gladwell, Audra McDonald

Amanda Seyfried, Natalia Makarova, a Top Ten List presented by Mick Jagger & Keith Richards, Awolnation

Ewan McGregor, Bailee Madison

Betty White, Morena Baccarin, Dylan Moran

After a source's body is discovered in a Soho backstreet, Bel wants the team to halt their pursuit of the dangerous Cilenti. As she attempts to convince Freddie not to risk his life for a story, he becomes more determined than ever due to a new lead. Randall challenges McCain about his part in Cilenti's manipulation of the previous week's show as Hector manages to wow executives in a meeting with ITV and is tempted by the prospect of being lauded.