Journey's End

"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.

In the episode, Sarah Jane Smith (Elisabeth Sladen) and Martha Jones (Freema Agyeman), former travelling companions of the time-travelling Tenth Doctor (David Tennant), prepare to counter the Daleks' universe-destroying Reality Bomb with devastating weapons of their own.