曾有两次:《神秘博士》2017圣诞特别篇

导演：瑞秋·塔拉蕾 

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 

TAG：剧情 科幻 悬疑 冒险 

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.