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) the Internet, and was being widely traded via the BitTorrent file sharing protocol. The leaked episode did not contain the new arrangement of the theme tune by Murray Gold. The leak was ultimately traced to a third party company in Canada which had a legitimate preview copy. The employee responsible was fired by the company and the BBC considered further legal action. "Rose" was first broadcast in the United Kingdom on 26 March 2005 on BBC One, and was the first Doctor Who episode to air since the Doctor Who television film in 1996. Unofficial overnight viewing figures from the