The TARDIS is as much a part of Christmas as turkey, mince pies, and mulled wine, and former "Doctor Who" showrunner Steven Moffat certainly knows his way around a festive adventure. This year's holiday offering,

Doctor Who Christmas special "Joy to the World" writer Steven Moffat and showrunner Russell T Davies dish on spoilers and script changes.

Joy to the World was Steven Moffat's meditation on loneliness, showing how the Doctor and every character are worse for it.

It’s not that Doctor Who’s festive episodes can’t be memorable; “The Husbands of River Song,” “A Christmas Carol,” “The Runaway Bride,” and more beg to differ. But I know it’s a holiday tradition in the U.

Filming that scene in the room that’s from millions of years ago was Coughlan’s favorite, she tells TV Insider. “It had a little bit of everything. You got that emotional moment and then you have the dinosaur and the escape, and I loved all of that,” she shares. “It’s such a fond memory.”

Just like Santa, BBC sci-fi behemoth Doctor Who is returning on Christmas Day to deliver a special gift: “Joy to the World.” The hour-long, annual Christmas special this year features Bridgerton star Nicola Coughlan when it reteams the Fifteenth Doctor, played by Ncuti Gatwa, and writer Steven Moffat with showrunner Russell T Davies.

It’s Christmas Day and for fans of Doctor Who that can only mean one thing: it’s time for the yearly Christmas special! This year’s special is titled Joy to the World and will once again star Ncuti Gatwa as the Fifteenth Doctor;

The lead actor has done the most important thing you can do in Doctor Who and that's lose your job security,' says Moffat of his pick.