曾有两次：《神秘博士》2017圣诞特别篇
- 主演：彼得·卡帕尔迪 大卫·布拉德利 马克·加蒂斯 珀尔·麦基 莉
- 状态：HD
- 导演：瑞秋·塔拉蕾
- 类型：科幻
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.