David Tennant stepped in as the Tenth Doctor and was introduced to viewers in the series' first Christmas special, "The Christmas Invasion." This year marks the 20th Doctor Who Christmas special.

How to watch: Doctor Who: "The Christmas Invasion" is now streaming on Max. This Tenth Doctor special is the beginning of his end as the titular Time Lord. (Well, sort of.) As you might expect ...

Introducing David Tennant as the new Doctor. Santa-shaped assassins and deadly Christmas trees herald the approach of a terrible danger from the stars. How scary is the episode? With Michelle Ryan.

40 years later, David Tennant's Doctor Who debut, "The Christmas Invasion" established the annual tradition of the festive special, something which has been brought back by returning showrunner ...

With 9.35 million viewers and an AI of 84 it is far from the most popular Doctor Who special but it does mark a pivotal point in the series. 8. The Christmas Invasion - 2005 The first Doctor Who ...

Introducing David Tennant as the new Doctor. Santa-shaped assassins and deadly Christmas trees herald the approach of a terrible danger from the stars. Meet the new Doctor! See the Doctor regenerate!

And right now, fittingly, the hotel is holding a “Christmas Everywhere All at Once” special, staff member Trev tells the Doctor. Whilst in the lobby chatting up Trev, Fifteen clocks an odd man ...

Doctor Who: Joy to the World Christmas Special will be on BBC One and streaming on iPlayer this Christmas, December 25th. Add it to your watchlist now to make sure you don't miss the excitement ...