Dr. Jennifer Keller's body is inadvertently taken over by a cunning thief, Neeva Casol. While Neeva tries to escape Atlantis, Keller finds herself imprisoned with a death sentence on another planet, forcing the team into a race against time to return Keller to her original body before she is put to death.
Phyllis' Moroccan-themed holiday party goes up in flames when Meredith's hair catches on fire and Michael is forced to deal with the accident. Meanwhile, Dwight corners the market on the hottest toy of the Christmas season.
As preparations get under way for the school's cultural festival, Ryƫji urges Taiga to consider reconciling with her estranged father.
Mr Merdle's death and the collapse of Merdle's Bank sends shockwaves through London as thousands face financial ruin. Arthur returns to the Marshalsea a prisoner, Amy goes back to her birthplace to look after him as he lies gravely ill, and Rigaud returns to play out his blackmail in the Clennam house.
As Christmas nears, Liz's parents ditch her for a couples-only retreat, leaving her all alone for the holiday. Because of this, Liz decides to work for a charity program, "Letters to Santa." Meanwhile, Jack takes his frustration out on the staff after his dream holiday is ruined.
For the quickfire, chefs must identify ingredients in a dish. For the elimination challenge, the contestants cater a bridal shower for judge Gail Simmons.
Mr Dorrit returns to Venice, a broken man, after a visit to London revives unwelcome memories. Arthur warns his mother that she may be in danger from Rigaud. And Amy and Arthur meet again.
The team is forced to investigate two crimes at once when a mysterious energy field seems to be the cause of a billionaire's disappearance and the death of his limo driver.
Detectives Lupo and Bernard investigate when the writer of a bestselling memoir is found dead in a community of male prostitutes.
It becomes clear JD has no interest in his father's advice regarding Madison. Lyla turns to Riggins when Buddy reveals a secret. Coach is emotionally challenged both on and off the field. Tyra has a plan to repair her relationship with Landry.
The team has two weeks to develop an airbag for high-rise construction workers that can sense the onset of free fall and deploy within a second.
A food bank delivery man is found murdered and buried up to his neck, surrounded by flower petals in a backyard. Crews and Reese believe the incident may be related to a cult from the 1970s. Crews confronts Mickey Rayborn, despite warnings from the FBI.
The BAU team hunts for a serial killer who targets members of the police department in Phoenix, Ariz., a case that hits close to home for Morgan, a former cop.
Pacific Wellcare, Charlotte's practice opens, and the competition with Oceanside Wellness starts; Dell suggests that an in-house adoption program should be created.
Chuck and Ned deal with the shocking return of someone from their past; Emerson and Olive investigate the death of a lighthouse keeper.
Investigators discover a kennel of sick dogs that have been fed carcasses.
Filled with love for Carmelita, newly-elected Senator Patrick Darling goes against Nick and Tripp's advice and invites her to his inauguration. Meanwhile Chase defies his agreement with the Darlings and threatens to go public with his accusation that Patrick murdered his sister; Jeremy finds out that Simon has control of Nola's little brother; as Andrea's health dims, Brian promises God anything to make her well again; and Karen goes to Nick's apartment to make amends with him, but is confronted by a gun-wielding intruder.