If you're a fan of Sherlock and Doctor Who prepare to have your mind blown. And if you're a somewhat interested follower of both, well, you can expect pretty much the same thing to happen to you too.
Ahead of the big Doctor Who Christmas Special and Sherlock's miraculous New Year's Day return, a very clever YouTuber by the name of John Smith has edited together this utterly fantastic sequence in which Benedict Cumberbatch's Sherlock actually comes face to face with Matt Smith's Time Lord.
We could go into more detail, but we think it's better if you just watch it and see for yourself.
