(The Doctor takes Adam back home to Earth)
The Doctor: The whole of history could have changed because of you.
Adam: I just wanted to help.
The Doctor: You were helping yourself.
Adam: And I'm sorry and I've said I'm sorry. And I am, I really am. But you can't just leave me like this!
The Doctor: Yes, I can. 'Cause if you show the head to anyone, they'll dissect you in seconds. You'll have to live a very quiet life. Keep out of trouble. Be average. Unseen. Good luck.
Adam: But I want to come with you!
The Doctor: I only take the best. I've got Rose.