SARAH JANE: Doctor, you're being childish.

DOCTOR: Well of course I am. There's no point in being grown up if you can't be childish sometimes.

“The very powerful and the very stupid have one thing in common. They don’t alter their views to fit the facts, they alter the facts to fit their views. Which can be uncomfortable if you happen to be one of the facts that needs altering.”

“I had to face my fear… That was more important than just going on living.”

“Oh, my giddy aunt.”

“Do you like my puppets, Doctor? Do you like my fun? All of them have played and lost, but here's my favourite one.”

“Now, someone tell me what the hell is going on here?”

“Well, that’s alright, then!”

SUSAN: The TARDIS can go anywhere.

BARBARA: TARDIS? I don’t understand you, Susan.

SUSAN: Well, I made up the name TARDIS from the initials, Time And Relative Dimension In Space. I thought you’d both understand when you saw the different dimensions inside from those outside.

IAN: Just let me get this straight. A thing that looks like a police box, standing in a junkyard, it can move anywhere in time and space?

SUSAN: Yes.

DOCTOR: Quite so.

IAN: But that’s ridiculous.

“No! Stop, you're making me giddy! No, you can't do this to me! No, no, no, no, no, no, no, no, no, no, no, no, no!”

DOCTOR: Goodbye, Zoe.

ZOE: Goodbye, Doctor. Will we ever meet again?

DOCTOR: Again? Now, Zoe, you and I know, time is relative, isn't it?

“Ta-da!”

“But she's the only human left with music in her heart! Playing lovesick songs for heartbroken lesbians. And that just makes me hungry for all those delicious songs.”

“A sad old man once told me, what survives of us is love.”

“That's what we do, all of us. We see something inexplicable and invent the rules to make it work. Mankind saw the sunrise and created God. Or we saw the arrival of a Sontaran, one or the other.”

“You cad!”

ROGUE: They'll kill us. Then this house. Then London. Then the world. You know that. You absolutely know it. So can you do it? Can you lose your friend to save the world?

DOCTOR: No.

ROGUE: I know.

(Rogue kisses the Doctor and takes the trigger off him. He pushes Ruby out of the triform and takes her place.)