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
Utopia (Doctor Who) Other actors returning to the franchise in this episode are Neil Reidman had previously played Tom Braudy in the Eighth Doctor audio drama "Memory Lane" and Robert Forknall, who plays Lord Byron in the Eighth Doctor audio drama "The Company of Friends". Chipo Chung, who played Chantho, would later go on to play the Fortuneteller in "Turn Left". Paul Marc Davis, who played the Futurekind chieftain, also returned to the "Doctor Who" universe, going on to play the role of The Trickster in "The Sarah Jane Adventures" stories "Whatever Happened to Sarah Jane", "The Temptation of Sarah Jane Smith" and