The Doctor receives out of space mail, a box, allegedly from another timelord, The Corsair. They track back the origin of the box, and land on a planet outside the known universe. Instantly the TARDIS's power is drained and flows into Idris, one of only four inhabitants on the planet, the others being Auntie, Uncle and Nephew (an Ood.) The Doctor makes a disturbing discovery, he learns who the House is, and worse he learns the fate of a lot of timelords.
Only a little pointer but we hear the concept of a timelord being able to regenerate into a male or female.
I applaud the utter imagination of Neil Gaiman, this episode it totally off the scale, but it's a ball of fire, total fun.
This left me completely in love with Suranne Jones, she's totally mad and utterly fun, her performance is just brilliant. She has some cracking one liners, my favourite of course being the chin joke.
I love the rather disturbing bits of Amy and Rory trapped in the TARDIS, these scenes are particularly nasty.
It's a very dark episode, the pizazz and madness at the start hides what is actually a deep and nasty story. The entire cast perform particularly well. I'm not sure what I think about the TARDIS core becoming human, but I guess we've heard many times that the TARDIS is a living thing. The ending is very sweet, random but very touching.
It's a great, fun episode. 8/10