Doctor: Don't be so defeatist. You've got two of the finest minds ever to graduate the Academy of the Time Lords of Gallifrey. There's not a puzzle in the universe we can't solve given a little time.

Missy: Two of the finest minds? Did you ever actually graduate, Doctor? I never can remember.

DOCTOR: You know, I'm a little worried about the amount of anger you seem to feel.

NARVIN: You should be!

DOCTOR: Oh not for my sake, for yours, it can't be healthy.

NARVIN: Look at the whiteboard! Was that you who wrote that?

DOCTOR: Oh, that, yes, sorry... I noticed you'd made a couple of mistakes, sorry, I was trying to be helpful. You see, if x is defined as—

NARVIN: Helpful? I spent hours working through those equations.

DOCTOR: Probably why you got them wrong, I'm sure you were tired.

NARVIN: They weren't wrong! And what's that? Bottom left.

DOCTOR: Oh, that's just a risotto recipe that occurred to me while I was correcting your maths. I jotted it down so I

didn't forget it. Then I forgot it, sorry. Do you have a spare piece of paper? I could just copy it down.

MASTER: Missy? Seriously, why?

MISSY: Oh, because he's right. Because it's time to stand with him. It's where we've always been going, and it's happening now, today. It's time to stand with the Doctor.

MASTER: No. Never. Missy! I will never stand with the Doctor!

MISSY: Yes, my dear, you will.

MASTER: Dying in your arms. Happy now?

DOCTOR: You're not dying. Don't be stupid. It's only a bullet. Just regenerate.

MASTER: No.

DOCTOR: One little bullet. Come on.

MASTER: I guess you don't know me so well. I refuse.

DOCTOR: Regenerate. Just regenerate. Please. Please! Just regenerate. Come on.

MASTER: And spend the rest of my life imprisoned with you?

DOCTOR: You've got to. Come on. It can't end like this. You and me, all the things we've done. Axons. Remember the Axons? And the Daleks. We're the only two left. There's no one else. Regenerate!

MASTER: How about that. I win. Will it stop, Doctor? The drumming. Will it stop?

ROMANA: K9 is a vicious robot criminal from the fifth galaxy. Aren’t you, K9?

K9: Affirmative!