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《曾有两次：《神秘博士》2017圣诞特别篇》内容简介
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.
半部好电影，它的剧情发展做到了令观众不由自主的产生了疑惑和目不转睛的肢体动作。