"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.

The fourth series of British science fiction television programme Doctor Who was preceded by the 2007 Christmas special "Voyage of the Damned". Following the special, a regular series of thirteen episodes aired, starting with "Partners in Crime" on 5 April 2008 and ending with "Journey's End" three months later on 5 July 2008. The series incorporates a loose story arc consisting of recurring mentions of the disappearance of various planets and moons.