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
导演：
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.