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.
Casts
Jodie Whittaker
Mandip Gill
John Bishop
All Doctor Who Title Sequences: 1963-2023 | Doctor Who
The Adventure of a Lifetime
Thirteenth Doctor Title Sequence | Doctor Who: Series 11
Twelfth Doctor's Christmas Titles | The Husbands of River Song