John's resentment of actor Macaulay Culkin dampens his Christmas spirit. Meanwhile, Lou is worried when his rival, network host Jesse Tyler Munoz, announces a competing holiday special, and Andre is mistaken for a puppet.

The Librarians have to rescue Santa, when the Serpent Brotherhood want to kill him. The crew have to help Santa complete the true, secret purpose of Christmas.

The Mayor of Pittsburgh, Bill Peduto, does a stint as a municipal employee in the Steel City. During his shifts, Peduto performs jobs as a refuse worker, a carpenter, a self-sufficiency coordinator and a Public Works employee who cuts down dead trees.

Back in the States, Carrie and Saul investigate what she saw in Islamabad.

Shelby the Swampman uses an airboat to search for a treasure trove of century old logs in a legendary lost canal. In Washington, Rygaard tries to haul out the biggest log on their site - a mammoth six-ton cypress. In the Wyoming wilderness, while David Zitterkopf delivers the first load of logs to the mill, his sons struggle to hold down the fort. In Alaska, Adrianne steps up and takes a shot at working on the landing for the Papac crew. In British Columbia, the most rugged section of the Britannia site puts Triack to the test. And in Florida, the Dreadknots are firing on all cylinders, but an accident late in the day could be a game changer.

The disappearance of Whitney spurs Helen to scrutinize Noah and his relationship with Alison and her family. Cole searches for answers at Lockhart Ranch. Meanwhile, Detective Jeffries makes significant progress on his case.

"Seeing Red" premieres and Valerie deals with a barrage of reviews, but the harshest criticism comes not from the ladies on "The Talk" or the media but from her husband, Mark. Meanwhile, Valerie gets a surprise on a trip to Mickey's apartment.

The CSI's investigation of the victim of an apparent hit and run leads them into the world of aeronautics.

The team investigates a murder linked to a counterfeit diamond operation, but an illness forces Jane to direct his colleagues from the office as he recuperates. Meanwhile, Abbott is concerned that transgressions in his past could harm his wife's chance to obtain a prestigious job in Washington, D.C.

Bo and Tamsin protect a Japanese warrior with a hit on his head. Lauren deals with death threats of her own.

Marco's ingenuity - and loyalty - is put to the ultimate test when Kublai takes a violent and bold step in his quest to become emperor of the world.

It's charity day at Valco and everyone's doing their little bit to help. Gavin has offered to shave his legs, Brian is dressing up as a giant paracetamol tablet, and Sue and Linda are hitting the saddle for a sponsored bike ride. There's a big prize draw to win a car, too, but fair play is called into question when Rose sets her sights on it.

Rachel Riley, Ray Winstone, Ricky Tomlinson and Josh Widdicombe are the guests on the show.

The friends are 4,000 miles from home and Phil is enjoying the chance to reinvent himself, but Sam is missing his old life. Some worrying news from back home forces them to make a difficult choice. They soon find out that the road back to Bracknell is longer and more perilous than they imagined.

Following an explosive escape from an American maximum security prison, Sam and Phil's spirits are lifted for a moment until another case of mistaken identity sees them risking their lives once again.

Louis Walsh, Glen Matlock, Lloyd Langford and Melissa Steel are the guests on a festive themed edition of the show.