The Librarians' first solo mission hits a snag when Baird loses the others in a mysterious Labyrinth that magically exists below the skyscraper of a modern corporation.

John Hartmann, the President and CEO of True Value, one of the largest hardware cooperatives in the world, reactivates his undercover skills from his time as an FBI agent when he investigates the state of the True Value company and employees. During his "special assignment", the boss is shocked by the inappropriate on-the-job pickup artist antics of one of the employees.

In the aftermath of the Snow Queen's spell, our heroes try to pick up the pieces and Regina has to make a difficult choice. Hook's fate hangs in the balance as Gold's quest for power threatens everything he holds dear. And, in the Enchanted Forest flashback, an intrusion during Belle's stay at Rumplestiltskin's dark castle will wreak havoc in both the past and the future.

Jake and Charles' bro-mance starts to crack when they volunteer for an eight-day stakeout in very close quarters. Meanwhile, Captain Holt's nephew, Marcus, comes to Brooklyn and captures Rosa's attention.

Tina goes undercover in her old Thundergirls troop to find the mole who is giving away their cookie secrets. Meanwhile, Linda dyes her hair blonde.

The American dream becomes a hard reality for this Irish bar owner after Taffer discovers he withheld employee paychecks to keep the business afloat.

The first challenge is to make a favorite holiday meal using samples; the chefs play Watch Your Weight when preparing decadent desserts; and the winner is declared after a game of No Carts Allowed, in which the two finalists serve elegant New Year's dinners.

Carrie puts her life on the line in order to extract her team from Pakistan.

A sudden death leads Will and Mac to ponder the milestones that transformed the newsroom, and look ahead towards ACN's uncertain future. Maggie lands a field-producer interview in Washington; Neal's digital site is shut down for repairs; Leona offers sage advice to Pruit.

It's week three, and the loggers are feeling the pressure to produce. In Alaska, Coatsy's still out of commission, so Papac institutes an extremely dangerous process called Shotgun Logging. Over in Wyoming, the Zitterkopf men are taking the Bear Ranch site by storm. At Rygaard, the team has doubled the yarders to up production, but they've also doubled their trouble by crowding an already tight landing. Up in Canada, Triack Resources are on a roll using a logging method called "chucking", but getting the loads out is proving a major challenge. And in Florida, poor communication between the Chapman crew nearly costs a diver's life.

Frank Martin and Caterina Boldieu are posing as an extraordinarily wealthy couple, in order to retrieve a handful of diamonds which have been stolen from their current client, and replace them with infallible fakes.

A revelation about their daughter Whitney makes Noah and Helen realize their troubled marriage is directly affecting their children. Bending under remorse, Alison spirals towards a reckoning.

Valerie plans a special date for her and Mark, but a re-shoot threatens to change her plans. Paulie feels anxious over early reviews.

The team attempt to find out more about the bizarre death of a man who was killed twice.

Jane and Lisbon travel to Beirut where they must work with Jane's familiar adversary, Erica Flynn, who agrees to help the FBI apprehend her boyfriend, a courier for terrorist organizations, in exchange for amnesty for her past crimes.

Bo turns to an estranged family member for help. Lauren finds herself haunted by a mysterious spirit.

A whistleblower brings disturbing news about the hospice program to light, putting the entire staff's future in question. Dawn takes a big romantic step, but unexpectedly finds herself caught between two suitors. DiDi takes her salary issues to Jenna, who tries to hold everything together.

Marco begins a dangerous relationship with the beautiful Blue Princess as tensions grow between Kublai and Xiangyang's cunning chancellor Jia Sidao.

Charlie's dad Brendan stops by the store and Gavin is determined to make her look good, something that's easier said than done. Elsewhere, Linda's dirty secret is revealed, and, finally taking charge, Colin forces Rose and girlfriend Lisa to battle out their differences once and for all - in the back of a locked delivery van.

A team of orienteers and gamesmasters battle it out for a place in the next round of the competition.

One-off special revisiting highlights from the latest series of the comedy panel show, with presenter Jimmy Carr, team captains Sean Lock and Jon Richardson and a host of celebrity guests. Stars who appeared during the run included Louis Smith, Rob Beckett, Carol Vorderman, Alex Brooker, Sarah Millican and Paul Hollywood.

Rhod Gilbert hosts another round of the light-hearted music quiz, with team captains Phill Jupitus and Noel Fielding joined by Irish actress Yasmine Akram, American musician and producer Steve Aoki, Canadian stand-up comedian Bobby Mair and singer-songwriter Rumer.