Planetoid. The Doctor and Sexy bicker while they assemble TARDIS pieces. She accuses him of never reading instructions, and asks him what the sign on the door of the TARDIS says. He tells her it says, "Pull to open," and she points out that he always pushes. They fight some more, and he accuses her of not being very reliable: "You didn't always take me where I wanted to go." Sexy: "No, but I always took you where you needed to go." And then he gets excited about being able to speak with her, and wishes he could even when she's in a box and not a human body. But she can't, since she exists across all of space and time. Plus, he talks too much for her to ever get a word in edgewise. She stumbles again, and tells him that one of her kidneys has already failed. She has about eighteen minutes to live, and the universe they're in has about three hours until it reaches absolute zero. So I guess House was keeping it warm? By... metabolizing rift energy? Sure, let's go with that. With time at a premium, they get back to work.
See Amy run. Run, Amy, run! See the door close between Amy and Rory. Pound on the door, Rory! They each try to open the door from their own side. And then Amy hears Rory calling out to her from further down the corridor. She runs towards the sound and sees Rory sitting on the ground. He's pissed of because she's been gone for hours. So they run some more. And another door closes between them. This is the worst habitrail ever.
The Doctor and Sexy have assembled what looks like a pretty complete console, but with only a partial outer wall. She's still looking through the junk for parts while he puts together doohickeys at the console. Sexy asks, "Do you ever wonder why I chose you, all those years ago?" He thinks that he chose her because she was unlocked, but that was because she wanted to steal a Time Lord, and he was the only one mad enough.
Amy walks cautiously down a corridor. And then she hears Rory's voice, and turns around and finds an old and bearded Rory huddled against the wall. He's quite pissed. After having once waited 2,000 years for her, you'd think another sixty or so would be no big deal, but he's clearly mad. So she runs away from him. As you do.
On the planetoid, Sexy hangs a wire hanger on the console while the Doctor loops a velvet rope around the base of it. And then he tries to take off. But it keeps breaking down, with sparks flying. Meanwhile, Sexy can't stop looking at her own face in a mirror on the console. The Doctor tells her that the console won't work: "I've got nothing." Sexy: "Oh, my beautiful idiot. You've got what you've always had. You've got me." And she kisses her own finger with gold-sparked lips and touches the finger to the console and it starts working. The makeshift TARDIS takes off.