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Someone has just tried to kill Stephen Fisher, and Strickland may be next. Thirty years earlier, both were part of a group involved in a covert operation for MI-5. Other members of the group are already dead. Strickland turns to Sandra and her team for help. watch
Christmas Eve 1892 and the falling snow is the stuff of fairy-tales. When the fairy-tale becomes a nightmare and a chilling menace threatens Earth, an unorthodox young governess, Clara, calls on the Doctor for help. watch
[Warning: The following contains spoilers from the Season 7 finale of Doctor Who. If you haven't watched yet, read no further or we'll be forced to sic our memory worm on you.]
One mystery down, and an infinite number more to go on Doctor Who.