Magnum takes the case of a little girl’s missing cat and, in the process, stumbles upon another cat’s murdered owner who happens to be an FBI agent.
The remaining eight couples dance to country music songs.
The coaches enlist Mariah Carey as Key Advisor on the final night of Knockouts, when the coaches pair their artists to perform solo, then select just one of them to move on to the Playoffs.
'Cupcake king' Sunny meets fellow self-professed boffin Misha. Twins Rebecca and Stephen nervously embark on dates with engineer Kristian and legal assistant Emily. Fred's dad visits the restaurant.
Five cookie makers enter the workshop to find host Eddie Jackson lounging in a beach chair under a palm tree; the bakers are challenged to create cookies perfect for a Christmas in the tropics.
Bull confronts his guilt over closing his psychiatric practice to start TAC when his former patient, a young woman who is a clinical sociopath, goes on trial for killing her brother. When Bull and Benny’s client has no memory of the crime due to her mental condition, they enter a "Not Guilty by Reason of Insanity" plea and aim to seat jurors that are sympathetic to mental illness.
Morgan and Shaun’s indecision on how to treat a young violinist who visits the ER with an infected finger could affect her future in more ways than one. Meanwhile, Lim, Claire and Park can’t figure out if their young patient is really ill or looking for attention.
When Cal wakes with a life-threatening fever, Grace worries it's a side-effect of his experimental cancer treatment, but Michaela and Ben suspect Cal's condition may be related to a mysterious passenger from Flight 828. As Cal's situation worsens, Ben and Michaela attempt to track down the now-missing passenger.
When patients from the hospital's prescription drug trial start suffering life threatening side effects, Nic fears that her sister Jessie may be in danger. As a result, she and Conrad work to convince Bell that these trials are not worth the risk. Meanwhile, Mina, Austin and Kit must set aside their competitive nature and work together on a patient whose health is quickly deteriorating and Devon uses Julian as the beta tester for a product he's designed.
Buck jumps back into the dating scene but fears he will return to his old ways; a woman goes to great extremes on a freeway overpass to get the attention of her husband; a couple have a car accident on their wedding day.
When the Legends discover a fugitive is hiding in 1970’s London, they realize he is part of a gang that is targeting the British Monarchy. Trying to stop the gang, they realize someone from the Legends must infiltrate them. Surprising everyone, Ray is the one to gain their trust after he is put through a series of tests with help from Sara and Rory. Meanwhile, Gary shows Nate the ropes at the Time Bureau, but it turns out to be anything other than an ordinary day at the office.
A very pregnant Patient 6 visits Dream Corp LLC desperate to be cured of her strange addiction to eating couch cushions. Randy makes a cyst popping video.
Watts kills a man in self-defense, then Murdoch uncovers the victim’s criminal past.
Roberts' old roommate, Bill Ruff, pays a visit to Dream Corp LLC under the guise of selling bad office artwork; everyone in the staff is charmed except for 88, who makes it his mission to expose Bill's real intentions.
Mr. Small goes feral after Gumball and Darwin expose his hypocrisy.
After the list shakeup, the 405 has an entirely new list and everyone is still fighting to get to the top. Dave is down for repairs, so Chuck, Ryan, Shawn and Monza battle it out to try to take the top spot. Meanwhile, Doc tries to get himself out of the bottom five.
JP believes he may be from another planet, so Craig tries to help him make contact.
Victoria Coren Mitchell presents the quiz show about making connections. A team of pyromaniacs take on three animation fans.
Alton Brown renovates, updates and repairs classic episodes by offering brand-new recipes and kitchen tips. He also gives a behind-the-scenes look at the show's production that will leave superfans wanting more.
The disguised Suzukawa attempts to bribe the 7th for Shiraishi's freedom, but he is killed Second Lt. Koito Otonoshi, who foils the plot on Tsurumi's behalf. Sugimoto flees with Asirpa, Ogata, and Shiraishi on an experimental hydrogen airship, though they are pursued by Koito. The group manages to throw Koito off the ship and escape the 7th by travelling through the Daisetsuzan mountains.