- The Doctor: We are not of this race. We are not of this earth. Susan and I are wanderers in the fourth dimension of space and time, cut off from our own people by distances beyond the reach of your most advanced science.
- The Doctor: [to Ian] You still think it's all an illusion?
- Ian Chesterton: I know that free movement in time and space is a scientific dream I don't expect to find solved in a junkyard.
- The Doctor: Your arrogance is nearly as great as your ignorance.
- [On Susan's intelligence]
- Barbara Wright: I'm lending her a book on the French Revolution.
- Ian Chesterton: What's she going to do? Re-write it?
- The Doctor: This doesn't roll along on wheels, you know.
- Barbara Wright: You mean, it moves?
- Susan Foreman: The TARDIS can go anywhere.
- Barbara Wright: TARDIS? I don't understand you, Susan.
- Susan Foreman: Well, I made up the name TARDIS from the intials: Time And Relative Dimension In Space. I had thought you'd both understand when you saw the different dimensions inside from those outside.
- The Doctor: You don't understand, so you find excuses. Illusions, indeed? You say you can't fit an enormous building into one of your smaller sitting rooms?
- Ian Chesterton: No.
- The Doctor: But you've discovered television, haven't you?
- Ian Chesterton: Yes.
- The Doctor: Then by showing an enormous building on your television screen, you can do what seemed impossible, couldn't you?
- Ian Chesterton: Well, yes, but I still don't know...
- The Doctor: Not quite clear, is it? I can see by your face that youre not certain. You don't understand. And I knew you wouldn't! Never mind.
- The Doctor: Have you ever thought what it's like to be wanderers in the fourth dimension? Have you?... to be exiles? Susan and I are cut off from our own planet, without friends or protection. But one day we shall get back. Yes, one day. One day.
- Barbara Wright: [finding the TARDIS] Ian, look at this.
- Ian Chesterton: Well, it's a Police Box. What on earth's it doing here? These things are usually on the street.
- [feels the TARDIS]
- Ian Chesterton: Feel it. Feel it. Do you feel it?
- Barbara Wright: It's a faint vibration.
- Ian Chesterton: It's alive!
- [walks around its circumference]
- Ian Chesterton: It's not connected to anything, unless it's through the floor.
- Ian Chesterton: 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 Foreman: Yes.
- The Doctor: Quite so.
- Ian Chesterton: But that's ridiculous!
- Susan Foreman: Is that the book you promised me?
- Barbara Wright: Yes.
- Susan Foreman: [Barbara lends Susan the book on the French Revolution] Thank you very much. It will be interesting. I'll return it tomorrow.
- Barbara Wright: Oh, that's not necessary. Keep it until you've finished it.
- Susan Foreman: I'll have finished it.
- Ian Chesterton: And, frankly, I don't understand your attitude.
- The Doctor: Yours leaves a lot to be desired.
- Ian Chesterton: But that's ridiculous.
- Susan Foreman: Why won't they believe us?
- Barbara Wright: How can we?
- The Doctor: Now, now, don't get exasperated, Susan. Remember the Red Indian. When he saw the first steam train, his savage mind thought it an illusion, too.
- Ian Chesterton: You're treating us like children.
- The Doctor: Am I? The children of my civilisation would be insulted.
- The Doctor: We are not of this race. We are not of this earth. We are wanderers in the fourth dimension of space and time, cut off from our own planet and our own people by eons and universes that are far beyond the reach of your most advanced sciences.