Mickey Smith is a fictional character in the BBC One science fiction television series Doctor Who. He is portrayed by British actor Noel Clarke and was the show's first televised black companion. The character is introduced as the ordinary, working class boyfriend of Rose Tyler, a London shopgirl who becomes a travelling companion to the Ninth and Tenth incarnations of an alien Time Lord known as the Doctor. Mickey first appears in the first episode of the 2005 revival, "Rose". Initially someone who struggles in the face of danger, Mickey nevertheless acts as an Earth-based ally to the Doctor and Rose. In the second series he joins the pair as a second companion of the Doctor's, though he leaves during the 2006 series to pursue his own adventures. He returns to aid the Doctor and Rose in the series finale later that year, and then again for the 2008 finale "Journey's End," as well as fleetingly in 2010 in the Tenth Doctor send-off "The End of Time".

"Journey's End" is the thirteenth and final episode of the fourth series of the British science fiction television series Doctor Who, which was first broadcast on BBC One on 5 July 2008. It is the second episode of a two-part crossover story featuring the characters of spin-off shows Torchwood and The Sarah Jane Adventures, preceded by "The Stolen Earth", which aired on 28 June. At 65 minutes in length, it was approximately 20 minutes longer than a standard fourth-series episode. It marked the final regular appearances of every companion introduced in the Russell T Davies era, including Catherine Tate as Donna Noble.