The Doctor: Invasion of the very small cubes. That's new.
Brian: What if they're bombs? Billions of tiny bombs. Or transport capsules, maybe, with a mini-robot inside. Or deadly hard drives. Or alien eggs. Or messages needing decoding. Or... they're all parts of a bigger whole. Jigsaw puzzles that need fitting together.
The Doctor: Very thorough, Brian. Very, very thorough. Well done. Stay here. Watch these. Yell if anything happens.
Rory: What do you think we do when we're not with you?
The Doctor: I imagine mostly kissing.
Rory: There are soldiers all over my house and I'm in my pants.
Amy: My whole life I've dreamed of saying that. And I miss it by being someone else.
Rory: You said we had to be patient.
The Doctor: Yes, you. You, not me. I hate being patient. Patience is for wimps.
Amy: Secret base beneath the Tower. Hope we're not here because we know too much.
Kate: Yes, I've got officers trained in beheading. Also ravens of death.
Amy: I like her.
The Doctor: I need to think, I need some air. Who has an underground base? Terrible ventilation.
The Doctor: I'm not running away. But this is one corner, of one country, on one continent, on one planet, that's a corner of the galaxy, that's a corner of the universe that' is forever shrinking and growing and destroying and never remaining the same for a single millisecond. And there is so much--so much to see, Amy. Because it goes so fast. I'm not running away from things, I'm running to them before they flare and fade forever.
Amy: And why do you keep coming back for us?
The Doctor: Because you were the first. The first face this face saw. And you are seared onto my hearts, Amelia Pond. Always will be. I'm running to you and Rory before you... fade from me.
Amy: Don't be nice to me. Don't want you to be nice to me.
The Doctor: Yeah, you do, Pond. And you always get what you want.
Music: Titanium (David Guetta Feat Sia Furler)
Kate Lethbridge-Stewart was first introduced in 1995 in the Reeltime direct-to-video production Downtime. She was portrayed there by Beverley Cressman and the character had a grandson, Gordon.
The logo reflects the theme of the episode: this one consists of black cubical patterns.
US: September 22, 2012 on BBC America
The Doctor: Through the looking glass again.
Lewis Carroll (b.1832 - d.1898), whose real name was Charles Lutwidge Dodgson, is best known as the author of Alice in Wonderland (1865) and its sequel Through the Looking Glass (1871). In the latter, Alice was able to go through the mirror into another world on the other side.