DOCTOR: Ah yes... well, a while back, the TARDIS showed me something-- a recording of me, as I am now, inside the earliest control room. I hadn't understood what I was doing there-- until Ian said something about "never changing". And suddenly, ding! Lightbulb on!

(Second panel reveals the eleventh Doctor sonicing the first TARDIS console, and a small explosion in reaction)

DOCTOR: You see, the only way to win was to make sure the TARDIS would always remain the same-- it's image had to become imprinted on humanity's race memory forever. So I destroyed the program that disguised it's shape... it was called the chameleon circuit.

(Third panel reveals the eleventh Doctor and Barbara sat together clinking glasses in front of the lively wedding reception)

BARBARA: So that blue box is always going to be out there, appearing wherever there's danger, whenever the human race needs help?

DOCTOR: I'm afraid you're stuck with me, Mrs Chesterton... Till death do us part.