"Everything Changes" is the first episode of the British science fiction television programme Torchwood, which was first broadcast on 22 October 2006. The story was written by show creator and executive producer Russell T Davies as an introduction to the show's mythos. The episode re-introduces Captain Jack Harkness, who had proved popular in the first series of the 2005 revival of Doctor Who, as the leader of Torchwood, a team of alien hunters.