DOCTOR: Every great decision creates ripples, like a huge boulder dropped in a lake. The ripples merge and rebound off the banks in unforeseeable ways. The heavier the decision, the larger the waves, the more uncertain the consequences.

DOCTOR: You can always judge a man by the quality of his enemies.

DOCTOR: Ace, give me some of that Nitro Nine that you're not carrying.

MIKE: I found him wandering the streets.

DOCTOR: I was not wandering the streets. I was merely contemplating certain local cartographic anomalies.

ACE: We did good, didn't we?

DOCTOR: Perhaps. Time will tell. It always does.

DAVROS: The Daleks shall become Lords of Time! We shall become all-

DOCTOR: - Powerful. Crush the lesser races. Conquer the galaxy. Unimaginable power. Unlimited rice pudding, et cetera, et cetera.

RACHEL: Why are two Dalek factions fighting each other.

DOCTOR: Ace.

ACE: It’s simple, isn’t it. Renegade Daleks are blobs.

DOCTOR: Blobs?

ACE: Imperial Daleks are bionic blobs with bits added. You can tell that Daleks are into racial purity. So, one lot of Daleks reckon the other lot of blobs are too different. They’re mutants. Not pure in their blobbiness.

DOCTOR: Result?

ACE: They hate each other’s chromosomes. War to the death.

DOCTOR: Your species has the most amazing capacity for self-deception, matched by only its ingenuity when trying to destroy itself.

(Gilmore grumbles)

IAN: I just feel we should be doing something.

RACHEL: Frankly, I wouldn't advise it, Group Captain. We're in way over our heads.

IAN: You were hired as a Chief Scientific Advisor. One tends to expect advice from ones advisers.

RACHEL: For one thing, Group Captain, I was not hired, I was drafted. And for another, do you think I am enjoying having some space vagrant come along and tell me that the painstaking research I have devoted my life to has been superseded by a bunch of tin-plated pepperpots?

IAN: Steady on, Professor.

RACHEL: Steady on? You drag me down from Cambridge, you quote the Peace Time Emergency Powers Act at me, and then you expect me to advise on something outside the realm of human experience! Bluntly, Group Captain, we're reliant on The Doctor because only The Doctor knows what is going on.

ALLISON: A matter transmitter? But that's impossible.

RACHEL: Impossible. You know after this, I'm going to retire and raise begonias.

TV ANNOUNCER: This is BBC television. The time is a quarter past five and Saturday viewing continues with an adventure in the new science fiction series, Doc-

DALEK: Small human female sighted on level three.

ACE: Who you calling small!

(Ace proceeds to bash the dalek with her baseball bat, knocking off the eye stalk)

DOCTOR: You destroyed it.

ACE: I aimed for the eyepiece.

ACE: These dayleks-

DOCTOR: Daleks.

ACE: Oh, Daleks, where are they from?

DOCTOR: From Skaro, at least originally. They're the mutated remains of a species called the Kaleds. Left here.

(The Doctor points left)

ACE: When were they left here?

DOCTOR: No, turn left here!

ACE: Oh, right.

DOCTOR: No, left, you missed the turning.

ACE: What turn? Where?

(Ace looks from side to side)

DOCTOR: Why don't you concentrate on where you're going!

ACE: Look I'm doing the best I can, if you don't like it you drive!

(Screen goes dark as they drive under a bridge. When we next see them they've swapped places)

ACE: Professor I'm hungry! Lack of food makes me hungry, you know.

DOCTOR: Lack of food makes you obstreperous.