The regeneration will take place in this year’s Christmas special, ‘Twice Upon A Time‘, which will also feature the First Doctor played by David Bradley.
Doctor Who season 11 premieres sometime in fall 2018 on BBC America.
BBC announced that Whittaker’s Doctor will be joined by three new companions for season 11.
More companions means more room for banter and bickering — something that comes with the territory of traveling with the Doctor.