Doctor Who (series 4) Astrid Peth, who died during the events of the episode. The companions in the regular series had all been in the lead companion role previously: the primary role of Donna Noble, who was introduced in "The Runaway Bride", was played by Catherine Tate for all thirteen episodes. Her return was announced by the BBC on 3 July 2007. Freema Agyeman, who portrayed the Doctor's companion Martha Jones in series three, returned for "The Sontaran Stratagem", "The Poison Sky", "The Doctor's Daughter", "The Stolen Earth" and "Journey's End". Billie Piper, who played Rose Tyler from the first episode of the new
Rose (Doctor Who episode) more dramatic, but the scene was never reshot. Davies remarked that it reflects Rose's point of view, whereas a more dramatic entrance would reflect the audience's excitement at the Doctor coming back. The scene in which the Auton arm attacks in the Tyler's flat was originally much longer, but was revised. The episode originally underran by several minutes, and a scene with the Doctor and Rose walking was added a month or so later. Davies wanted the Doctor to realise that Rose has something to offer to his cause. Their holding hands while running was meant to signify that they