Chris and his co-hosts salute the new year with a one-hour review of the greatest and geekiest moments of 2011. Special guests Wil Wheaton (“Star Trek: The Next Generation,” “Stand By Me”), Nathan Fillion (“Firefly,” “Castle”) and stand-up comedian Kumail Nanjiani (“Franklin & Bash”) join in the nerd-eriffic year-end festivities, including the crowning of “Nerdist of the Year.” Also, Chris travels to London for interviews with David Tennant (“Doctor Who,” “Harry Potter and the Goblet of Fire”) and Simon Pegg (“Shaun of the Dead,” “Star Trek,” “Mission Impossible”).

Madge Arwell and her two children, Lily and Cyril, are evacuated to a draughty old house in Dorset, where the caretaker is a mysterious young man in bow tie, and a big blue parcel is waiting for them under the tree. They are about to enter a magical new world and learn that a Time Lord never forgets his debts...

Barry McGuigan, Su Pollard, Simon Webbe, Debra Stephenson, Charlie Brooks and their respective partners battle it out to be crowned this year's Christmas champions.

The year is 1919 and it is Christmas time at Downton Abbey. A lavish Christmas party is to be held at the Abbey but despite being the season of goodwill, tensions are high and Bates's arrest has cast a shadow over the whole of Christmas.