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The TARDIS lands on deep-space trading post of Iceworld, in the far future. The Doctor, Mel, their old friend Glitz and waitress Ace look for some treasure, guarded by a fire-breathing dragon.
The Doctor: Time for a quick adventure, then back for tea.
The Doctor: Yes, that's right, you're going. You've been gone for ages. You're already gone. You're still here. You've just arrived. I haven't even met you yet. It all depends on who you are and how you look at it. Strange business, time.
The Doctor: Think about me when you're living your life one day after another, all in a neat pattern. Think about the homeless traveller in his old police box, his days like crazy paving.
The Doctor: There are three rules. One: I'm in charge. Two: I'm not the Professor. I'm the Doctor. And the third... Well I'll think of the third by the time we get back to Perivale.