Christine attends a Christmas block party, where she learns a surprising secret about her neighbor (Molly Shannon)

Vince wins the quarterback spot despite doubts about his ability to handle the role. Elsewhere, Tami tries to soothe the grieving Julie; Riggins has a run-in with Becky’s father; Luke sustains an injury; and Landry makes a move on Jess

Veronica tries to get information on Veridian layoffs from Rose, who knows a friend in her playgroup. Meanwhile, Lem has an affair with a lawyer who bills him by the hour, and Linda unwittingly makes Phil the main character in her children’s book.

Alicia investigates a judge’s questionable motives after he overturns a simple plea bargain she arranged, and she learns that the judge has a history of unusual sentences. Meanwhile, Diane gets a tempting offer that may be too good to pass up, which delights Will

J.D. and Turk have time to party, when their wives are out of town.

The enlisted son of a retired colonel who became a preacher is found dead, and the team believes he was the victim of a hate crime. Meanwhile, Gibbs’ father (Ralph Waite) visits, and Gibbs is perplexed by his unusual behavior

When a Marine is killed by an exploding cell phone, the team investigates his former unit, which specializes in explosives, to see if its members are suspects or potential victims

Eric Delko returns as an expert witness for the defense, pitting himself against his old team.

Leonard’s mother (Christine Baranski) visits, which pleases Sheldon but upsets Leonard. .

During a political protest an unhappy farmer threatens the U.S. Treasury Department building by parking his tractor full of explosives nearby. Meanwhile, Loker has to bear down with a group of third graders in a field trip stuck in the Lightman Group offices.

Charlie helps Jake cheat on his girlfriend while she’s away for the holidays. Evelyn brings a television producer to Charlie’s Christmas dinner.

Hoping not to ruin their Christmas, Billie tries to keep the fact that Zack is living with her from her parents. Meanwhile, Nick makes an effort to impress his father-in-law.

When Marshall picks up smoking again, it prompts Lily, Ted and Barney, ex-smokers all, to succumb as well. Meanwhile, Robin gets a new co-anchor at her show…

In the Season 4 finale, the police close in on the Trinity Killer, who cautions Dexter to keep away. But Dexter is willing to do whatever he can to get his man, legal or not. Meanwhile, LaGuerta and Batista must answer for their breach of ethics; and Debra becomes privy to something she’s not sure she wanted to know

In the third-season finale, Hank is unpleasantly surprised by a visit from Mia (Madeline Zima) and her low-life manager-boyfriend (James Frain). And circumstances lead to Karen discovering Hank’s past involvement with the young seductress. Meanwhile, Charlie must come to the realization that his relationship with Marcy may be over.

The 1999 death of a high-school debate champion, which was originally ruled a suicide, is investigated after new evidence suggests he was murdered. The probe reveals the victim received a scholarship at a top private school and died shortly after losing a debate at the competitive campus

The Rapture happens on Christmas Eve, and Stan is left behind.

After Peter throws him a wild bachelor party, Carter slips into a deep coma that not even Dr. House can bring him out of. Lois, now in control of Pewterschmidt Industries, is convinced by Peter to let him run the operation. Overcome by power, Peter fires the entire board. Carter eventually recovers, but realizes that it may be tough to get his company back.

After having too much egg nog at the office party, Cleveland spills the beans about Rallo’s father. Cleveland tries to reconnect father and son in an attempt to save Rallo’s Christmas spirit. Meanwhile, Roberta becomes an animal rights activist and tries to save a reindeer.

Bart decides he wants a brother after observing Lisa and Maggie’s bond when the power goes out during a blizzard. Peyton, Eli and Cooper Manning, Kim Cattrall, Huell Howser and the Smothers Brothers have voice cameos as themselves