《曾有两次：《神秘博士》2017圣诞特别篇》是由瑞秋·塔拉蕾导演于2017年在英国发行的科幻电影，更新于2022-12-10 13:53，本片主要讲的是：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.