The guys rope Zack into their costume contest entry as the Justice League.

Bonnie's attempt to make family dinner a tradition doesn't go over well. Ed befriends a new doctor at the hospital and wishes that Henry could be more like him.

Brennan vows to release valuable data; Michael must try to turn the tables.

After years of being mistreated by Frank during the holiday season, Dennis and Dee decide to teach him a lesson. Meanwhile, Mac and Charlie reflect on their childhood Christmases, and realize that they were not as joyous and wonderful as they remembered.

Michael's actions force a tactical assault team to pursue him.

Various sites around the world; such as Göbekli Tepe in Turkey; the Incan ruins of Sacsayhuamán in Peru; the Carnac stones of France; and Zorats Karer in Armenia, show construction techniques and mathematical concepts that were not believed to have been known at the time, and that this knowledge was gained from alien visitors.

After years of being mistreated by Frank during the holiday season, Dennis and Dee decide to teach him a lesson. Meanwhile, Mac and Charlie reflect on their childhood Christmases, and realize that they were not as joyous and wonderful as they remembered.

Mike Huckabee

Conan welcomes actor Mark Wahlberg, humorist Charles Phoenix and musical guests Jenny and Johnny.

Amy Sedaris, Paul Simon

Actor Matt Damon; Florence & the Machine perform.

Jason Segel, Adam Ferrara, Tanner Foust & Rutledge Wood, Katharine McPhee

Ponyville is preparing for a visit from Princess Celestia, and especially Twilight Sparkle wants everything to be perfect. However, when a swarm of adorable insects with ravenous appetites, Parasprites, invades the town, trouble is amiss. While everyone tries to drive the Parasprites out of town, Pinkie Pie is instead focusing on gathering various musical instruments, for some reason.

Alex and Mason try to be just friends but that's hard when Dean returns and Mason gets jealous. Meanwhile, Justin tries to motivate some wizards.

The panelists on this episode are Bill Bailey, Rich Hall and Rob Brydon.

Popular news quiz, with team captains Paul Merton and Ian Hislop, guest host Alexander Armstrong and guest panellists Micky Flanagan and Ross Noble.

Mark's baby's christening day arrives and he arranges to take Jeremy to the church with him. The duo end up getting locked in the hallway of Zahra's flat though.

Graham meets Hollywood superstar Cher and actress and comedian Dawn French, while the Script perform their new single, Nothing.