DOCTOR: A hyperactive Peri. Too ghastly to contemplate.

MASTER: You are indeed a worthy opponent. It's what gives your destruction its piquancy.

PERI: I'm not totally ignorant. What is the noun for a collection of geniuses? A bevy?

DOCTOR: An inspiration of geniuses? I don't know.

DOCTOR: George Stephenson?

DRIVER: Aye, sir. Do you know him?

DOCTOR: I know of him. Peri, how would you like to meet a genius?

PERI: I thought I already had.

RAVENSWORTH: I will venture just one question, Doctor. What precisely do you do in there?

DOCTOR: Argue, mainly.

(The Doctor unlocks the TARDIS door and Peri enters. He follows her, shuts the door and the Tardis dematerialises.)

STEPHENSON: Where've they gone?

RAVENSWORTH: Where indeed? You know, I always said he was a strange sort of fellow.

(Peri follows the Rani, nearly bumping into her and knocking her close to a mine.)

RANI: Incompetent fool! You're worthless!

DOCTOR: Not to me, she isn't. You'll do well to remember that.