The Doctor and Sexy keep flying. And he calls her sexy, to her delight.
Rory leads Amy down the corridor by her hand, ignoring her protests that she can see fine now. They've reached a door, which happens to be the door to which Sexy gave Rory the directions. And just on cue, she sends Rory a telepathic blast with the passkey. "Crimson. Eleven. Delight. Petrachor." He says it a few times, but it doesn't open the door. Amy remembers that Sexy earlier told them what petrachor meant, which makes her realize that the passkey must be delivered telepathically -- it's the meaning, not the actual words, that matter. Nephew is lumbering around the corner as she has this realization. So Amy thinks the passkey at the door. Crimson is a red flag waving in the wind. Eleven is the eleven candles on her birthday cake. Delight is her wedding day. And petrachor is a drop of rain falling on the dusty ground. And then the door opens, and they're in the control room as it existed for the Tenth Doctor. Amy turns on some lights and Rory drops the shields.
Sexy tells Doctor that the shields are down. In the old control room, House's voice asks them how they found the room, since it's not on his internal schematics. He doesn't actually wait for an answer, but just tells them that since they've become so much trouble, he's just going to have Nephew kill them. And then Rory gets another telepathic message telling them to get out of the way or be atomized by the incoming TARDIS console. But Sexy doesn't actually know quite where they'll come through, so she can't really tell him where is "out of the way." Least helpful warning ever. No matter. Rory and Amy hide behind a pillar while the Doctor and Sexy materialize right on top of poor Nephew. Sexy is in some pain from her failing body. The Doctor helps her sit on the floor and then introduces her to Amy as both his TARDIS and a woman. Amy: "Did you wish really hard?" Doctor: "Shut up! It's not like that." Oh, but it's exactly like that. Which is just confirmed when Sexy introduces herself: "Hello. I'm Sexy." Doctor, to Amy: "Still shut up!" House's voice notes that the environment has been compromised, and tells Nephew to kill everyone. For a guy who can create specific illusions for each person in his corridors, he sure seems to have trouble keeping track of who's on board. Amy and Rory wonder where Nephew is. When he hears that Nephew was standing right where the console materialized, the Doctor tells them that he must have been "redistributed." Which is a nicer way of saying he's been atomized and they're currently breathing him in. I wonder if it's possible to get a space tetanus shot? House suggests a few ways he could kill the Doctor and company, but the Doctor tells him that if he kills them, he won't be able to accept the Doctor's help, which he'll need if he wants to make it back to the main universe. All the Doctor wants is a promise that House won't kill them. Amy thinks the Doctor is kidding. Doctor: "I'm sure it's an entity of its word."