Martin Freeman and Benedict Cumberbatch recorded video greetings for the fans at Comic-Con and in Cumberbatch's hilarious video, he "explains" how Sherlock survived Series 2's cliffhanger ending. (Freeman encouraged the fans to attack Moffat and the producers in his equally amusing clip.)

"It's a rational explanation," Moffat said. "We knew how it was going to be done. When you see the answer, you'll see yes, we had to know in advance, we had to plot it out."