"Well, there were these cracks in space and time. And the cracks were absorbing things and people and such. And when that happened, those people and things were completely erased from time and space - their loved ones didn't even know they had ever existed. But sometimes, when there was a very strong bond, those people knew something was missing."

He would say he's not a good man, nor a hero. He just sees trouble happening and has to do something about it.

"The only way to get rid of the cracks at that point was to reboot the entire thing."

He'll just not talk about the part where he sacrificed himself to do it and he's only a live now because Amy Pond remembered him.