Welcome back, Aang. How are you feeling?

Still on the roof, are you?

Yes, I'm afraid so. [a pause, and then]

I know your friends from home have been watching out for you, but ... if you need a place to rest, I've the Zero Room, here in my TARDIS. It's a special room built to keep out negative energies and help relax the mind. If you're weary ... you're welcome to it.

It's a ship, of sorts. I've parked it in my room.

Not quite. It's ... do you have airships, in your world? It would be slightly more comparable to that, I suppose.

There's a very special trick to it - it's bigger on the inside than on the outside, like the castle. Keeping it in my room helps me know it's safe, and not being tampered with.

Inside of it, yes. I traveled all sorts of places with it, before I came here ... and that room's come in quite handy.

You're more than welcome. I'll set up a cot for you, shall I?