Doctor Who (series 10) is the thirteenth season of the series.
Bill Potts (Doctor Who) . In the show 's tenth series , starting with the first episode , Bill serves as a companion of the twelfth incarnation of the alien time traveller known as the Doctor ( portrayed by Peter Capaldi ) . Doctor Who (series 10) . The series introduces Pearl Mackie as Bill Potts , the Doctor 's newest travelling companion , and also features Matt Lucas as Nardole , who appeared in the 2015 and 2016 Christmas specials .