The Doctor, Light and others in “Ghost Light”

But you evolve too, Light.

Nonsense!

Of course you do. You change, you adapt, all the time. Your attitude, your place, your mind... I mean, look at you now: you're no longer your original shape. And I don't think much of your catalogue- it's full of gaps.

(suddenly alarmed) All organic life is recorded!

What about the gryphons, the basilisks? You missed the dragons, the bandersnatches... then there are the slithy toves and the crowned Saxe-Coburg. (Strolling into the entrance hall, he casually clicks his fingers and Light immediately appears at the staircase)

(frantically reviewing his data screen) Where are these items?

I can't think how you missed them. You have to complete the catalogue before you destroy all life here.

Control?

She's no use to you, she's evolved as well.

No! All slipping away...

All is change, all is movement. Tell me, Light, haven't you just changed your location?

(Gritting his teeth) Not yet.

What's the matter, Light? Changed your mind?

You are endlessly agitating, unceasingly mischievous, will you never STOP?!

I suppose I could. It would make a change.

(desperate) Nimrod- I can rely on you! Assist me now...

I'm sorry, sir, but my allegiance is to this planet- my birthright.

(Hysterical) Everything is changing! All in flux! Nothing remains the same!

Even remains change. It's this planet- it can't help itself.

I... will not change... I'll wake up soon. No... change... dead... (trails off as he begins to evaporate)

(To the data screen) Subject for catalogue: file under "'Imagination', comma, 'lack of'".