The Doctor

The Doctor came from the planet Gallifrey, in the constellation of Kasterborous, home of the Time Lords. Details of his early life are unknown, but he attended the Time Lord Academy, where his best friend was the man who was destined to become his greatest nemesis, the Master. The Doctor eventually stole an obsolete type 40 TARDIS and fled Gallifrey in it, apparently accompanied by his granddaughter (who took the name Susan Foreman on Earth) in order to experience the universe for himself.