"Why did this face come back?" The Doctor kept asking himself.

He was in the TARDIS right now not knowing what to do, the face he had in his tenth incarnation had returned and he didn't know why.

The TARDIS had ended up in London, he had seen Donna and her daughter, he had seen a spaceship crash and he really had no choice but to ask you for help, you had been his companion before.

He was at the door of your house.

"Hi." He greeted as soon as you opened the door.