The cell's new leader, Karrar, pushes Darwyn aside as plans progress for the nuclear attack on Los Angeles Farik teaches a lesson about the terrorist way of doing business to an American philanthropist at a school in Yemen.
While Andrea prepares to celebrate Hanukkah, Ignatius inadvertantly brings a huge, angry snowman to life.
Robbie disguises himself as a snow monster in order to frighten the kids and stop them from playing outside in the snow.
While Melinda is at the Universitys botany lab she deals with some telekinetic events while dealing with a plant from Peru that is bleeding. Melinda finds that she must help a Doctor save herself.
The crew of Galactica makes a stop at the barren Algae planet.
The team tries to track the person murdering men in homes that are for sale, and Larry's dream of space may be in jeopardy.
Three girls become mermaids after a mysterious island transforms them and gives them special powers.
Ash and Dawn advance in the contest. They befriend another co-coordinator Zoey, who has some advice for Ash and Dawn.
Welcome to the Montecito Resort and Casino in Las Vegas, where you can do anything you want, but Ed Deline and his crack surveillance team will be watching. Just remember: what happens in Vegas stays in Vegas.
In Dallas, a woman is shot in while sitting in her car. Detective Eddie Ibarra and the homicide team focus in on two suspects swept up in a robbery investigation, and the pieces of the murder mystery begin to fall into place. In Detroit, a young woman and her daughter are shot dead in their apartment.
The future of Darwyn's cell is altered when he urges the FBI to intercept a shipment of nuclear material arriving at the Port of Los Angeles - sent by none other than Farik Ilija faces his past when he arrives home in Sarajevo.
In a special one hour Christmas episode, Michael sends out an inappropriate photo Christmas Card which lands him in hot water with his girlfriend Carol guest star Nancy Walls. Andy guest star Ed Helms takes Michael out drinking, with Dwight Rainn Wilson and Jim John Krasinski. Tensions on the party planning committee between Angela Angela Kinsey, Pam Jenna Fischer and Karen Rashida Jones results in two rival parties being thrown.
In a parallel universe, Sandy is married to Julie, Kirsten is Mrs. Jimmy Cooper, Summer is engaged to Ches, and Seth is in full geek mode. And Ryan and Taylor, stuck there after a fall, must change it.
Carla is finding the decision to return to work after having the baby tough. Elliot treats another doctor, which is always tough going. JD and Kim try to figure out how much they have in common.
Allison meets an FBI profiler she admires, but her visions start to involve him.
Carrie gets upset because one of her fellow secretaries "steals her moxie" and gets a promotion, and everything at IPS falls apart after Doug temporarily takes over the office.
Deacon and Kelly don't want Doug around Major anymore after he inadvertently scares him, and Arthur begins a new business selling senior citizen services to carpoolers.
A teenage girl is killed, and the only potential witness is her deaf mother. The case also brings back some haunting memories for Lindsey. Meanwhile, CSI also investigates the murder of a star figure skater.