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
Dalek (Doctor Who episode) Rose to order its own self-destruction to end its pain. Rose reluctantly agrees, and the Dalek shortly implodes thereafter. As they regroup with van Statten's staff, they learn his assistant has taken over, and will have van Statten's memories wiped of the Vault, while planning on filling the entire bunker with cement to prevent other problems. Rose offers Adam to travel with her and the Doctor since he will have no job after this. Rob Shearman, the writer of the episode, had his first encounter with the revived series of "Doctor Who" in 2003 after he created the Sixth Doctor