How do they produce marble, how do they make mahjong pieces, and how do they build escape slides? Finds out as more items are put under the microscope.
Gordon and Simon's values clash as they try to land a lucrative client; Lauren gets stuck in a $1 million bra.
Charlie is pursued by a hot reporter who wants to experience his sex study.
When Nathan learns why Debbie is Tom’s favorite child instead of him, he decides it’s time to fill his parents in on some of Debbie’s childhood secrets.
Sue Sylvester introduces the episode as a Christmas special that FOX did not allow to air from last year. The members of New Directions audition for roles in McKinley's living Nativity Scene. Meanwhile in New York, Rachel, Kurt and Santana work as Santa's elves at a mall.
Leonard has to deal with the fallout of disproving Sheldon's new scientific discovery. Raj spends a week at Howard and Bernadette's apartment.
Walden goes on a date with an accident-prone model; Alan's date reveals surprising personal information about herself to him.
While Neal delves further into the mystery of the Codex, Peter takes on a classified espionage case with a fellow FBI agent: his ex-girlfriend.
Caroline offers Stefan an unusual form of therapy. Meanwhile, Damon tells Elena about a terrible ordeal in his past that he has kept secret for decades, and she shares with him some disturbing information she recently learned about her family.
Terry plays politics when she challenges Dick for the position of League President. Meanwhile, The Cannon takes Danny out to the golf course to teach him a lesson in the importance of being a leader.
Stephen is determined to uncover what he hopes is the key to finding his father, and crafts a plan with the Tomorrow People that involves getting inside Jedikiah's head. Meanwhile, Cara and Russell encounter an uninvited visitor in the subway tunnel base. Stephen takes a risky opportunity and snoops around Ultra.
Jack and Michael meet The Apprentice's Nick Hewer and UK grime sensation Lethal Bizzle.
Mike and Frankie agree to house-sit for Frankie's sister in hope of having a romantic, kid-free weekend; Axl, Darrin and Sean go on a road trip.
Immunity challenge; a game of tug of war leads to a rare tribal council.
After acquiring a herd of reindeer, Frank gets the idea to start racing them; Delucci finds out that Robby covered for Frank, so Robby plans to have Delucci dethroned; Jans actions come back to haunt him and decides to seek asylum in Iraq.
Mikey joins the Canadian Rangers for an extreme outdoor training experience farther north than he's ever been. While he's gone, a military Aurora takes refuge in Buffalo's hangar for important repairs – pushing Buffalo's own mechanics out into the bitter cold. What should be a simple fix turns into a multi-day ordeal and the Air Force has to go head-to-head with Chuck. Joe flies to California to bid on a fleet of firefighting planes that could revolutionize his company. But he discovers he has tougher competition than he ever expected.
Hal Morrison and Captain William Parker interrogate Jasmine in a desperate attempt to gain insight into Hecky Nash's blackmail scheme. Keeping a close eye on Jasmine, Joe discovers she's hiding a secret that could cost her her life. Meanwhile, Sid and Terry get a tip that leads to a violent display of revenge.