曾有两次:《神秘博士》2017圣诞特别篇

地区：英国

年份：2017

演员：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

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.