DOCTOR: Been knocking about. A bit of a farewell tour. Things to do, people to see. There's always more. I could invent a new colour, save the Dodo, join the Beatles. I have got a time machine, Dorium. It's all still going on. For me, it never stops. Liz the First is still waiting in a glade to elope with me. I could help Rose Tyler with her homework. I could go on all of Jack's stag parties in one night.

DORIUM: Time catches up with us all, Doctor.

DOCTOR: Well, it has never laid a glove on me!