VALARIE: I know what it's like to lose someone! The grief? Oh, that comes easy. The hard part is realising you can't change the past!

VALARIE: Tell me why then. Why did they have to die?

DOCTOR: So they and countless others wouldn’t die in agony later. So that the universe could heal.

VALARIE: Hmmm. If you were a monster, I’d leave. No, that’s a lie - er - I’d try and stop you. But you don’t sound like a monster.

DOCTOR: Thanks very much

VALARIE: Having to make a call like that. To save a universe that sick. Sounds like you’re a doctor.

ELEVENTH DOCTOR: Know and time-travelling murderers with a passion for the convoluted?

TWELFTH DOCTOR: About two off the top of my head. But I’ve locked one in my basement and we’ve married the other.

CROWD: [Shouting] All hail Frobisher! All hail the big talking bird!

DOCTOR: (mexican) Why, hello, Bruce. What are you doing here, huh?