I used to think no Christmas Special could ever be better than The Snowmen. Now I'm starting to rethink that idea. Steven Moffatt has once again achieved the perfect balance of laugh-out-loud moments and moments that will leave you ugly-crying. Peter Capaldi and Alex Kingston deliver the beautiful chemistry that I never felt between her and Matt's Doctor. It's never scary, which is absolutely fine, and rarely threatening, which is fine for Christmas, but may convince some that it lacks any plot. They would be wrong.
Overall, a masterpiece and a half.