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.
Starring Matt Smith, David Tennant, Karen Gillan, Nicholas Briggs, Jenna Coleman, Peter Capaldi, Billie Piper, Jodie Whittaker, Mandip Gill, Arthur Darvill