[The Doctor exhales in exhaustion. He still wonders if there was ever a better choice for Skaro in his Fourth life. He did his best to try and have both sides compromise and he thought that did. The Doctor pushes the question of his choice that day. But he would still have to face that choice again as The War Doctor. There's something tired, sad, and self-loathing look on his face.] They were genetically mutated.

And what is that Celestia and the Netherworld have?

[The Doctor remarks playfully]

Oh Well! Plenty of places besides The Moon to do that. And other things to do like lava surfing.