 The twelfth series was broadcast on Sundays, except for the premiere episode, continuing on from the eleventh series, after regular episodes of the revived era have previously been broadcast on Saturdays.The series was preceded by a New Year's Day special episode in 2019, "Resolution", instead of the traditional annual Christmas special.Jodie Whittaker returns for her second series as the Thirteenth Doctor, an incarnation of the Doctor, an alien Time Lord who travels through time and space in the TARDIS, which appears from the outside to be a British police box.