The Doctor is a Time Lord: a 900 year old alien with 2 hearts, part of a gifted civilization who mastered time travel. The Doctor saves planets for a living—more of a hobby actually, and the Doctor's very, very good at it.
Christopher Eccleston
Doctor Who
Billie Piper
Rose Tyler
Camille Coduri
Jackie Tyler
Noel Clarke
Mickey Smith
Plan B
Alien: Earth
OATS Studios
The Man Who Fell to Earth
Debris
Invasion
The Lazarus Project
The Witcher: Blood Origin
Night Sky