And the stars...

they weren't in the wrong place. And I haven't time travelled...

I've just been here a very, very long time...

Every room resets.

Remember I told you that? Every room reverts to its original condition. Logically, the teleporter should do the same.

'Teleporters'- A fancy word. Just like 3D printers, really.

Except it breaks down living matter and information, and transmits it. All you have to do is add energy. The room has reset, return to its original condition when I arrived!

That means, there's a copy of me, still in the hard drive. Me... Exactly as I was, when I first got here. Seven thousand years ago.

All I have to find, is some energy...

And all you need for energy, is something to burn.

How long can I keep doing this, Clara?

Burning the old me to make a new one?

If you think because she's dead that I'm weak, than you understand very little. If you were any part in killing her, and you're not afraid, then you understand nothing at all. So for your own sake, understand this; I'm The Doctor. I'm coming to find you, and I will never ever stop.

Because you won't see this coming!

If I didn't know better, I'd say I travelled seven thousand years into the future.

"How many seconds in eternity?"

If I didn't know better, I'd say I've travelled Twelve thousand years into the future.

"How many seconds in eternity?" The Shepards Boy-

Six Hundred Thousand years into the future.

"How many seconds in eternity?" The Shepards Boy says.

Twelve Hundred Thousand years into the future.

The shepards boy says.

Two million years into the future.

The Shepard Boy says...

Twenty million years into the future.

The Shepard Boy says!

"There's thus mountain of pure diamond! It takes an hour to climb it, and an hour to go around it!"

Fifty-two million years.

"Every hundred years, a little bird comes!"

"And sharpens its beak on the diamond mountain!"

Nearly a Billion years.

"And when the entire mountain is chiseled away, the first second of eternity will have passed!"

Well over a Billion years.

You musta think that's a helluva long time!

Two Billion years.

Personally, I think that's a helluva-

Personally? I think that's a helluva bird.

[The Doctor finally escapes]