"The Christmas Invasion" is one of many Christmas episodes of Doctor Who. It was the first Christmas special of the 2005 revival of the show produced by BBC Wales. It stars David Tennant as the Tenth Doctor, and Billie Piper as Rose Tyler, with recurring cast members Noel Clarke as Mickey Smith, Camille Coduri as Jackie Tyler and Penelope Wilton as Harriet Jones, Prime Minister of Great Britain. It was aired December 25, 2005, and nominally set a year later, on December 24-25, 2006, in London, following the events of the two-parter "Aliens of London" and "World War Three", which led to Harriet Jones becoming Prime Minister.