The study group is slowly convinced to fill in for the Glee Club at Greendale's Christmas pageant.
Nick and Hank's investigation of a dead high school teacher leads them to the school's outcast, Roddy. Nick realizes that there's more to Roddy than meets the eye, and enlists Monroe's help to get through to the troubled teenager before he exacts revenge on the students who wronged him. Meanwhile, Nick learns that his presence is beginning to affect the creature world.
Andy attempts to make everyone's Christmas wishes come true, including those of a drunken Erin. Meanwhile, Dwight and Jim are entangled in an escalating prank war wherein one attempts to frame the other.
The gang have much to prove when they attend their high-school reunion. They meet old friends and make new foes as they stroll down memory lane.
A look at how scientists measure changes in the polar regions and what those changes mean for the animals and people who live there, as well as the rest of the planet.
The Pritchett clan decide to celebrate Christmas a little early (and in a hurry) so they split up to gather the holiday trappings as Mitchell, Alex and Lily hunt for a tree, Gloria and Luke fetch the ornaments, and Claire and Haley shop for the gifts. Meanwhile, Phil and Manny buy the groceries and Jay and Cameron stand by to wrap presents.
On a tipsy whim - and against Mike's wishes - Frankie decides to throw a Christmas Eve party at the house; Mike buys Frankie a much needed new dishwasher for Christmas, but has a hard time keeping it a secret when she begs him to replace the old one before the party; Sue calls on Reverend TimTom to explain the meaning of Christmas to Brick when he reads the Bible and begins to question it; and Axl gets annoyed with Bob when he tries too hard to be cool in order to befriend him while working together on a Christmas tree lot.
Phil uses Holly's assistant to help him land a star jockey as a client, but hes got his eyes on a bigger prize. Haskell talks Stuart into selling sentimental mementos from his marriage but Stuart has trouble letting go.
Emily questions Nolan's loyalty when she discovers a secret of his. Meanwhile, Amanda makes herself more comfortable in the Hamptons as word of her presence spreads. Victoria regains some power, and things get very ugly between her and Conrad.
Sparks fly when Joe discovers Gord has taken a job with a rival airline after completing expensive training on one of the Buffalo planes. Larry, a rookie rampie, makes a near fatal error while training on the C-46. A desperate search is launched for elusive C-46 parts.
Violet learns about the rules of the house. The truth about Larry's condition is explained. Constance is interrogated by the police.
The BAU team looks into the real reasons behind an apparent mass suicide of a small group of youths at a military academy. Also, Hotch and Morgan butt heads when a team member could be in jeopardy.
The contestants prepare steak for some of Texas' most discerning palates, at least beef-wise, the attendees of the Cattle Baron's Ball.
The murder of a retired Army Ranger brings the FBI in on the case, to Russell and Catherine's initial chagrin.
After a woman tells the SBPD she witnessed a murder happen in broad daylight, Shawn and Gus are the only ones who believe her, and therefore protect her by hiding her at a remote commune called Box Canyon Ranch, a place whose inhabitants label themselves as progressive intellectuals.
When Tessa overhears George break up with his girlfriend, Zoe, on Skype, she blames herself for his failed relationship and decides that she's going to get them back together. Unbeknownst to her, though, George is really enamored with Tessa's cute art teacher, Aimee. He admits to Mr. Wolfe that he's over dating crazy city women, and that he's looking for love in the burbs. George decides to embrace the holiday spirit with a tree trimming party complete with ex-girlfriend, potential new girlfriend and the Royces, and he soon finds himself under the mistletoe with a special someone.
Searching in a specific neighborhood, Steve and Marianne are ready to have a place of their own. They have flipped houses before, but now they have enlisted the help of the Property Brothers to find their perfect home. They are set on a specific neighborhood and have a strict budget. The Property Brothers accept the challenge to find and transform a home to exactly what Steve and Marianne want.
Reagan goes to great lengths to give Amy a perfect Christmas while Ava's relationship with Kevin hits an obstacle.
Victoria brings Joy, Melanie and Elka along for the ride when she's a guest speaker on a gay cruise, where Melanie has a surprise reunion with her estranged sister, and Victoria and Joy's lesbian facade could come crashing down when they meet the ship's handsome captain.