Sheldon and Wolowitz plan birthday celebrations for Amy and Halley, respectively. Also, Leonard receives a Christmas letter from his brother that causes him to spiral out about his own lack of accomplishments.

A young boy with a once-in-a-generation mind capable of advanced mathematics and science finds it isn't always helpful in a land where church and football are king. As he deals with the world his very normal family must find a way to deal with him.

Christy and Bonnie rally around Marjorie when her husband has a stroke.

A mystery unravels when an organization fighting to find a cure for vampirism enlists the help of someone in the group; old loyalties are put to the test with deadly results.

When Jen and Greg hire Clementine as a part-time nanny for Lark and invite her to join them for dinner, the waitress mistakes Jen for Lark's grandmother. Also, Tyler's new girlfriend turns out to be Sophia's fourth grade teacher, John hires a questionable company to set up an escape room in his house, and Matt grows frustrated with Colleen when she blames a valet for stealing her lottery ticket.

Charlie is pushed to "build someone better" when he disappoints both Linda and Maggie. Fonso reconsiders his intentions with Simza as he learns of Rita's obligation to the FBI. Nick and Drina's families attempt to put their relationship on ice.

When Hondo's imprisoned childhood friend asks him to protect his son from gang violence, the favor brings SWAT into contact with a new local crime outfit. Also, when Luca's grandfather, a SWAT legend, passes away, he struggles with his grief and a painful family secret.

Lambda's attempts to experiment on their confiscated pod go awry when a grotesque Norm emerges from the ghost vessel and unleashes havoc on anything in his path; a monster hunt begins.

The Dredge captures Calvin and tries to torture him into releasing the evil demons imprisoned in his ring; the Dredge's minions descend on the town's Founders Day Festival.

When a traveling carnival comes to Holden, a collection of new faces put Seth and Creeley on their toes, but it's a friend from the past that truly shakes things up.

The chefs battle each other in a fierce Mise En Place relay; chef Alex Seidel invites the group to his farm to learn about his take on farm-to-table cuisine; the chefs are tasked with creating a meal incorporating a mystery ingredient from the farm.

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Stephen welcomes actor Adam Driver, comic John Early, plus a musical performance by Jon Batiste.

A letter from Peter Townsend spurs Margaret to make a bold proposal. Elizabeth has good news that causes complications for Margaret.

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Coming Soon...

Victoria Coren Mitchell presents as the Detectives and Arrowheads return for this round two game of the quiz testing general knowledge and lateral thinking. Among the challenges facing the players is to determine what connects Man-Killer, Penthesilea, Sharron Davies and Jeff Bezos' company.

Regular team captains Paul Merton and Ian Hislop are joined by guest host David Tennant and panellists from the worlds of comedy, journalism and current affairs.

After the latest events, Ciro deals with O'Stregone to ask for an armistice. The Confederates are forced to grant him what he asks for, but making claims in turn.

Adam Hills, Alex Brooker and Josh Widdicombe examine the biggest and most entertaining stories of the week with celebrity guests including Jon Hamm and Rag'n'Bone Man who performs Human.

Genny is now in check and all he can do is send Patrizia from the Confederates to find out what their conditions are.

Sandi Toksvig looks at operations. If you've ever wondered how to turn a muffin into an offensive weapon, this is the show for you. With Bill Bailey, Katherine Ryan, Rhod Gilbert and Alan Davies.

Joining Graham Norton are the stars of Star Wars: The Last Jedi - Daisy Ridley, John Boyega, Gwendoline Christie and Luke Skywalker himself, Mark Hamill. And Sam Smith who performs Pray.