KAL: Za killed the old woman with his knife.

HUR: No.

KAL: Here. Here is the knife he killed her with.

DOCTOR: This knife has no blood on it. I said, this knife has no blood on it.

KAL: It is a bad knife. It does not show the things it does.

DOCTOR: It is a finer knife than yours.

KAL: I, Kal, say it is a bad knife.

DOCTOR: This knife can cut and stab. I have never seen a better knife.

KAL: I will show you one.

(Kal pulls out his flint knife)

DOCTOR: This knife shows what it has done. There is blood on it. (to Za) Who killed the old woman?

ZA: I did not kill her.

DOCTOR: (to Kal) You killed the old woman.

KAL: Yes! She set them free. She set them free. She did this. I, Kal, killed her.

DOCTOR: Is this your strong leader? One who kills your old women? He is a bad leader. He will kill you all.

DOCTOR: Yes, it all started out as a mild curiosity in a junkyard, and now it's turned out to be quite a, quite a great spirit of adventure, don't you think?

IAN: Yes. We've had some pretty rough times and even that doesn't stop us. It's a wonderful thing, this ship of yours, Doctor. Taken us back to prehistoric times, the Daleks.

SUSAN: Marco Polo, Marinus.

BARBARA: And the Aztecs.

DOCTOR: Yes, and that extraordinary quarrel I had with that English king, Henry the Eighth. You know, he threw a parson's nose at me.

BARBARA: What did you do?

DOCTOR: Threw it back, of course. Take them to the Tower, he said. That's why I did it.

BARBARA: Why?

SUSAN: The TARDIS was inside the Tower.

DOCTOR: Well, I can assure you, my dear Barbara, Napoleon would never have believed you.

IAN: Yes, Doctor, but supposing we had written Napoleon a letter, telling him, you know, some of the things that were going to happen to him.

SUSAN: It wouldn't have made any difference, Ian. He'd have forgotten it, or lost it, or thought it was written by a maniac.

BARBARA: I suppose if we'd tried to kill him with a gun, the bullet would have missed him.

DOCTOR: Well, it's hardly fair to speculate, is it? No, I'm afraid you belittle things. Our lives are important, at least to us. But as we see, so we learn.

IAN: And what are we going to see and learn next, Doctor?

DOCTOR: Well, unlike the old adage, my boy, our destiny is in the stars, so let's go and search for it.

Ever since his first sight of life on this world he had seen nothing but this constant and horrifying changing of shape. In his mind, he searched for all that he knew of biology and heredity, of genes and chromosomes, of glands.

RAMO: Why should I trust you?

DOCTOR: That's a very good question. I wish I could think of a good answer.

PELADON: Greetings, Princess. I'm sorry to hear that your journey ended so uncomfortably.

JO: The whole affair was most deplorable. The pilot was exceedingly inefficient.

THALIRA: Ambassador, we take it that these aliens are known to you?

ALPHA: Er, not the er, female? Not the female, your Majesty. Still, she's of no importance. But this is most certainly the Doctor. A good friend of your father, and of Peladon.

EVELYN: We’re on the Galápagos Islands! And that is a Galápagos tortoise!

DOCTOR: Well actually, Galápagos is a Spanish word for tortoise.

EVELYN: Oh?

DOCTOR: They named the islands after them, you see. The Tortoise Islands, which I suppose means that that is, in fact, a tortoise tortoise! And that’s something else I’ve tort-oise.

BERNICE: You know about me and the...oh goddess, you know him?

IRIS: Know him? I've had him! He's my fancy man.

(To Tu, a bovine-like alien)

ANGELO: Pull the other one. It's got teats on.

DOCTOR: I'm always explaining. Explaining and flailing, that's what River says. Like Mr Clever met Mr Tickle.