主演：彼得·卡帕尔迪  大卫·布拉德利  马克·加蒂斯  珀尔·麦基  莉莉·崔佛斯  杰瑞德·加菲尔德  朱迪·惠特克  托比·怀特豪斯  

导演：瑞秋·塔拉蕾  

简介：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.