DOCTOR: My Granddaughter, Susan! My friend Adric, who gave his life trying to save others! I have great faith in these people, whatever your name is, and if there's one thing you can count on in this turbulent and uncertain universe it's that I'll never allow any of them to come to harm if I can possibly... help it!

DOCTOR: That's the trouble with regeneration. You never quite know what you're going to get.