Recent events strain Burke and Cristina's relationship. Mark and Derek must work together when two close-knit brothers seek medical help. One of Meredith's half sisters is admitted to the hospital.
After Liz takes her ex-boyfriend, Dennis, back simply because he asks, Jack takes it upon himself to mentor her as he thinks that she is leading a life of mediocrity. Meanwhile, Tracy gets a tattoo in the face, Jenna gets botox and collagen injections, and Josh is given two black eyes by an angry Liz Taylor.
While everyone at Mode is celebrating Christmas, Betty is questioning her relationship with Walter and the feelings she has for Henry. Meanwhile, Daniel is sure of his love for Sofia, and Amanda, in order to get Betty's position, is planning a perfect Mode holiday party that fills the office with Styrofoam snow and holiday wishes.
Kovac and Gates treat a girl who appears to have been assaulted. When the police are no help with Ames, Kovac decides to confront the problem himself; Morris and other doctors work on a patient with an ice pick in his ear. Meanwhile, Ray tries to keep his new relationship a secret and Pratt can't fully deal when his half-brother officially comes out. Also, a new male nurse arrives.
Ash and co. finally arrive at Jubilife City, the first stop in Dawn's quest to be a great coordinator. It is there that she learns of a new fad. It's hip, it's hot, it's happenin' it's the Pokétch and, like all girls, Dawn has to have one. She gets one from three clowns only to find out from a smart little boy named Landis that it is a fake. Will she be able to get a real Pokétch, or will she be a trend loser?
When Taylor learns about Ryan's sleeping problems she devises a plan to help him but must then turn to Kaitlin when her plan backfires. At Brown Summer and Che step up their activism and it lands them more freedom than imagined. Julie also gets help from Kaitlin to help save the dating service.
A reality show contest where sixteen or more castaways split between two or more “Tribes” are taken to a remote isolated location and are forced to live off the land with meager supplies for roughly 39 days. Frequent physical challenges are used to pit the tribes against each other for rewards, such as food or luxuries, or for “Immunity”, forcing the other tribe to attend “Tribal Council”, where they must vote off one of their players.
Grylls is dropped by helicopter at the top of Mount Kilauea. Made up of an expanse of solidified lava which stretches for 33,000 acres, this environment is one of the world's most inhospitable. He first traverses lava fields, which catch his boots on fire, then heads into the jungles of Hawaii. Grylls uses a kukui nut torch to explore a lava tube and finds water, then uses smoke to placate a bee hive to get honey. Ultimately, he finds the sea (and people) by following seabirds.
The murders continue, and L grows suspicious of Light’s too-perfect behavior and decides to investigate him on his own. In order to get closer to Light, L enrolls at the same university and reveals himself to be L.
After a bartender is murdered The CSI team must prove that Hawkes did not commit the murder. That only becomes more difficult when the team is pulled off the investigation.
A serial killer from the past begins to possess people so he can kill again. Allison races against the clock to save his next victim, but she becomes a target in the process.
While trying to find out who framed him, Hopper is starting to figure out what his partner, Andrea, did that caused her disagreement with Internal Affairs.
Some of the residents of Jericho are concerned that Gray's actions may actually make Gray the new mayor. In other news, Mitchell claims that Jonah is the killer under much speculation.
While investigating the death of a film student who was working on a documentary about the legend of a headless witch who haunted the woods in the 1700s, Brennan develops a strong bond with the victim's brother.
As the Ravens prepare for the championship, Lucas learns Nathan intends to throw the game and decides on a risky plan to even the odds. Karen insists Deb show up for her son's final game and tries to help her get there. Also Dan makes a last plea with Daunte.
The BAU is called to investigate a series of murders of prostitutes in Washington D.C. and Reid suspects a teenager he met asking for his help is guilty of the crimes. The case becomes complicated when a congresswoman, who about to make a speech to praise the city's lower crime rate, threatens to take away the case if Hotchner calls a press conference to discuss it.
Christopher's well-intentioned gesture at Stars Hollow's knit-a-thon brings the event to an early end.
Mike Rowe wrangles some water snakes, steps into the shoes of hard working bait and lobster fishermen in Maine, and opens the viewer mail bag which results in some seaweed trimming.