We've already heard that the episode (two whole hours!) will feature a Christmas party, Matthew and Mary developments, and more about Bates's arrest. There's even a Christmas tree. What could be more festive than that?
If you want a sneaky peek at what's coming up in the episode, you are in luck - we've got our hands on these very exciting photos from the special, which airs on Christmas Day at 9pm on ITV1.
Click through our gallery to get some hints about the Christmas special of Downton Abbey!