Peter Capaldi’s final episode of Doctor Who this Christmas will feature Pearl Mackie as Bill Potts and be called Twice Upon a Time, it was revealed this evening (23 July) during a cast panel at San Diego Comic Con. Viewers will have to wait until Christmas to discover exactly how Bill, who will appear throughout the episode, makes her return.。Follows the story of Ruth Ellis: her lifestyle as a young nightclub manageress, her violent relationship with the man she then killed in cold blood, her arrest, trial, and subsequent legal battle to get her release before she was hanged.。