A delightful blend of lighthearted adventure and tearjerkers, "The Doctor, the Widow, and the Wardrobe" stands well on its own, but with extra rewards for Narniacs, such as the line 'What do they teach in schools these days?' The scenery was gorgeous, the aliens creepy--did they have to use something so close to the Weeping Angels' theme?--and the resolution heartwarming.
My favorite part, however would have to be Madge scolding the Doctor and what he does afterward. The whole scene, but especially...
Amy: We’re just about to have Christmas dinner. Joining us?
The Doctor: If it’s no trouble?
Rory: There’s a place set for you.
The Doctor: But you didn’t know I was coming. Why would you set me a place?
Amy: Oh, we always do. It’s Christmas, you moron.
Rory: Come on.