曾有两次：《神秘博士》2017圣诞特别篇剧情简介：曾有两次：《神秘博士》2017圣诞特别篇英国地区的于2017年上映，导演是瑞秋·塔拉蕾，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.