who played the main character?
Peter Capaldi.
Casting
Peter Capaldi reprised his role as the Twelfth Doctor in his third and final series; he left after the 2017 Christmas special, while Pearl Mackie portrays the newest companion Bill Potts, after the departure of Jenna Coleman.
when is the new dr who season starting UNANSWERABLE what is doctor who (series 10)? The main story arc for the first half of the series revolved around the Doctor and Nardole occupying themselves as a university professor and assistant while they guard an underground vault containing Missy, who the Doctor has sworn to protect for a thousand years after her supposed execution.
Peter Capaldi Peter Capaldi. Peter Capaldi .
Doctor Who (series 10) Doctor Who (series 10) Doctor Who (series 10)
Casting Introduction Introduction
Peter Capaldi reprised his role as the Twelfth Doctor in his third and final series;  receded by a Christmas special in December 2016, "The Return of Doctor Mysterio", the series is the third and final series starring Peter Capaldi as the Twelfth Doctor, an incarnation of the Doctor, an alien Time Lord who travels through time and space in his TARDIS, which appears to be a British police box on the outside; Capaldi announced in  
Preceded by a Christmas special in December 2016, "The Return of Doctor Mysterio", the series is the third and final series starring Peter Capaldi as the Twelfth Doctor, an incarnation of the Doctor, an alien Time Lord who travels through time and space in his TARDIS, which appears to be a British police box on the outside
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Doctor Who (series 10) [SEP] Casting
Peter Capaldi reprised his role as the Twelfth Doctor in his third and final series; he left after the 2017 Christmas special, while Pearl Mackie portrays the newest companion Bill Potts, after the departure of Jenna Coleman. To avoid leaks while casting the new companion, the production team used the word "Mean Town", an anagram of "Ten Woman"; this is a reference to the fact that Bill is the companion of the tenth series, and was revealed by the casting director Andy Pryor to Radio Times. Mackie made her first appearance in the first episode of the tenth series, and portrays the first openly gay companion.