    Sentence 1: Wnat notiday coincided with the first showing  of series two?    Sentence 2 for the Canadian broadcast Christopher  Facleaton recorded special video introductions for each  epiode cluding a trivia question az part of a viewer  contest) and excerpts from the Doctor Who Confidential  docarmentary Were played over the cloaing credits, for the  broadcast oF “The Crmstras Invasion” da 25 December  2005, Billie Piper recorded a special video introduction         