# [2 e/ L" l2 o7 U: x; y. c曾有两次:《神秘博士》2017圣诞特别篇的剧情简介 · · · · · · ; R# b' J$ F/ b, w0 G7 O, h 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.+ K2 }! f. E, Y- O: ^8 N3 S" z