神秘博士：时间尽头(下),神秘博士：2009圣诞特别篇(下),神秘博士：时之终结(下)The Doctor faces the end of his life as the Master's plans hurtle out of control. With the sound of drums growing louder, and an ancient trap closing around the Earth, the Doctor and Wilf must fight alone. But sacrifices must be made, and the deadly prophecy warns: "He will knock four times."