DOCTOR: Well done you did it.

EMILY BARNFATHER: It also means at some point we will have to come back this way.

DOCTOR: We'll cross that plank when we come to it.

EMILY BARNFATHER: It simply says to go to his study.

EMILY BARNFATHER: His study?

FOLEY: That's where he vanished, Miss.

EMILY BARNFATHER: I see.

DOCTOR: How can you be sure?

FOLEY: I can only tell you what I experienced, Sir.

FOLEY: I left the Professor there, it's a windowless room and he closed the door behind me. When I returned he was gone.

CHARLEY: A regular locked room mystery.

EMILY BARNFATHER: A secret tunnel... We found an honest to goodness secret tunnel!

CHARLEY: And a very nice one too.

EMILY BARNFATHER: But who put it here?

EMILY BARNFATHER: Who are you Doctor?

DOCTOR: I am me.

DALEK DIGGER: EXCAVATE!

BUCCA: Who are you?

DOCTOR: I'm the Doctor. You are the Bucca, I presume.

BUCCA: Are you the good one?

DOCTOR: I've always thought so, but some people prefer one of my other regenerations.

DOCTOR: We’re not lost, Charley. Think of it more as we’ve “gone on holiday by mistake”.

CHARLEY: Doctor, that’s life with you all over!

DOCTOR: What can I say? I’m the original accidental tourist.