changing their physical appearance and aspects of their personality. Tennant's second incarnation is outwardly similar to the Tenth Doctor, but with a more sentimental and affectionate persona, and a weariness that reflects his life experiences in the centuries since.

Prior to the reveal of Tennant's Fourteenth Doctor, the BBC had announced that the Thirteenth Doctor, portrayed by Jodie Whittaker, would be succeeded as the programme's lead by a new Doctor