ALISS: Don't turn your back on me. Please, don't turn your back on me.

SHAYA: Doctor, you said you'd been here before. When was that?

DOCTOR: A different life. Back when the world was made of diamonds. And I met something so vile. It had no face, no name, no self. I have never been so scared in my life.

BELINDA: What did it do?

DOCTOR: It had fun. Oh. Huh. It played games. I think it was learning.

BELINDA: But really. Cos my parents are back home, and if this is Friday, then they go to this bar with their mates, and my dad sings and everyone laughs and then the whole room ends up singing. Is that still happening, Doctor? Are they safe?

DOCTOR: I hope so.

BELINDA: You hope?

DOCTOR: Come here. I will meet your mum and dad, and I will make your dad laugh, and your mum can whistle at my behind. And I will sing. I will do the singing. That is a promise.

BELINDA: But you can't promise.

DOCTOR: Look at me. I can. I will. I do.

DOCTOR: There it is.

SHAYA: What?

DOCTOR: Ha. It’s behind you.

ALISS: I know.

DOCTOR: No. No, I’m talking to the thing behind you. And behind that. Ha, ha!

BELINDA: What did you see?

DOCTOR: The way out!

DOCTOR: I won't be long. Belinda's got you, yeah? (He turns off his captioning device.) Bel, be careful of her.

ALISS: I can still lip read.

DOCTOR: It doesn't matter the year. Signing still makes some people paranoid.

BELINDA: So, if we can't get home, and if the TARDIS isn't broken, then it means... what, planet Earth is broken? Or 2025 is broken? Have we been invaded? Or hit by a meteor? Or swatted by a giant moth?

DOCTOR: (gasps and grins) Imagine a moth that big!