5. The Girl In The Fireplace
The Girl in the Fireplace features some of the highest production values Doctor Who has ever seen. It combines pre-revolutionary France with a futuristic spaceship, and manages to present both in a believable manner. I think it's interesting that once again, Moffat writes an episode that doesn't really feature a villain, just technology executing the protocol it's been designed to follow. Sophia Myles takes what is on paper just another historical figure, and turns it into a three-dimensional, believable human being. Madame du Pompadour is a fascinating character, and I genuinely feel that she would have made a great companion. Not to mention the chemistry she had with David Tennant -- although that's hardly surprising, given that the two of them were an item at the time. Ultimately this is just an incredibly well crafted episode of Doctor Who. The aesthetics are gorgeous, from the sets to the costumes to the fabulous design of the clockwork men (the Doctor was right, they are a thing of beauty). There are some fantastic one-liners, as well as really poignant dialogue between the Doctor and Reinette.