DOCTOR: I always find that violent exercise makes me hungry. Don't you agree?

JO: You felt sorry for him, didn’t you. You wanted to come down here and see that was all right.

DOCTOR: Well, he used to be a friend of mine once. A very good friend. In fact, you might almost say we were at school together.

JO: How long’s he going to be here?

DOCTOR: Forever, I should think.