She told Total Film; ''I literally couldn't read it without crying ... It was the most highly-charged read-through I've ever experienced. But I couldn't have asked for a better exit. I don't think it'll be what people expect.''

We know that Karens final episode will not only be her last but also be actor Arthur Darvill's final episode too. We also know they are face-to-face with a set of Weeping Angels and a mysterious Villan....but the question on everyone's lips is ''Who survives, who does and how?''.