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.。Margaret和Mark都被困在不断循环重复的一天,他们都以为只有自己被困住了,直到他们碰到彼此。他们试图制作一张地图,记录所有以前被他们所忽视的小确幸。期间,他们也不断地了解彼此,也找到了打破循环的方法。。