Guest starring Alex Kingston as River Song, Neve McIntosh as Madame Vastra, Dan Starkey as Strax, and Catrin Stewart as Jenny. It features new monsters called the Whispermen and some scenes are set in Victorian Scotland. Someone is kidnapping the Doctor’s friends, leading him towards the one place in all of time and space that he should never go.
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. 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.