《曾有兩次：《神秘博士》2017圣誕特別篇》是一部優秀的科幻 類型影視作品，《曾有兩次：《神秘博士》2017圣誕特別篇》劇情簡介：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.