Rose was used to travelling, three years with the Doctor had given her enough experience to call herself a real traveller. She was used to seeing distant worlds, galaxies of stars all light years from home. She was used to seeing the past, the days long forgotten, she loved every second and was used to visiting them. But his past? She had no experience of that. But that was exactly where they were going. In the past over 900 years ago, back in Gallifrey, a war had started, a war that should never have happened and a baby was lost somewhere. That baby was the Doctor.