The BBC has released a prequel episode for the Doctor Who 2012 Christmas Special, "Vastra Investigates."
Madame Vastra, accompanied by her loyal companions Jenny and Strax, is called upon to investigate a Victorian murder mystery. But where is the Doctor?
Doctor Who: The Snowmen airs Christmas Day.
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Doctor Who 2012 Christmas Special Synopsis:
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. But the Doctor is in mourning, reclusive and determined not to engage in the problems of the universe. As old friends return, will the Doctor really abandon humankind or will he fight to save the world – and Christmas – from the icy clutches of this mysterious menace.