Dr. Who: We need... We need drugs to be treated.
Ian Chesterton: But where are we going to find them?
Susan Foreman: The TARDIS will have to take us to another time and place, where we can be cured.
Ian Chesterton: But don't you remember? We can't move the ship until we find the mercury for the fluid link!
Dr. Who: For the fluid link, yes. Yes, I'm afraid I cheated a little on that. I was determined to see the city, but everybody wanted to go on, and well, to avoid arguments, in short, there's nothing wrong with the fluid link.
Susan Foreman: What? Grandfather, do you mean to say that you risked leaving the ship just to see this place?
Ian Chesterton: You fool! You old fool!
Dr. Who: Abuse me as much as you like, Chesterton. The point is... we need an immediate return to the ship, and I suggest we leave at once.
Ian Chesterton: We're not leaving until we've found Barbara.
Dr. Who: Very well. You may stay and search for her if you wish, but Susan and I are going back to the ship. Now, come along, child.
Ian Chesterton: All right, carry on, fine. How far do you think you'll get without this.
[holds up the fluid link]
Dr. Who: Give that to me!
Ian Chesterton: Not until we've found Barbara.
Dr. Who: Give it to me I say!
Ian Chesterton: No. It's time you faced up to your responsibilities. You got us here. Now I'm going to make sure you get us back.
Dr. Who: Chesterton, this is...
Ian Chesterton: Were wasting time. We should be looking for Barbara.
Susan Foreman: He's right, Grandfather. We are wasting time.
Dr. Who: Child, if only you'd think as an adult sometimes... Oh, very well, very well. Let's go, then. Let's go.