A meeting in a London bus with jewel thief Lady Christina takes a turn for the worst for the Doctor when the bus takes a detour to a desert-like plane

TheTARDISlandsinLondononChristmasEve,1851andalmostimmediatelytheDoctorhearshisnamebeingcalled.Whenhemeetsthewomanshoutingforhimshefailstorecognisehima