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
Before the Flood (Doctor Who) Doctor and Rose Tyler in the episode "The Idiot's Lantern". The name often appears on electronic equipment throughout the series, such as Martha Jones' television in "The Sound of Drums", and a shop with the same name is seen in "The Beast Below". O'Donnell mentions prior companions Rose Tyler, Martha Jones, and Amy Pond, as well as Harold Saxon and events from "Kill the Moon". She also mentions "the Minister of War", but the Doctor has no knowledge of this, surmising that this will be in his future. The Tivolian race previously appeared in the episode "The God Complex". Prentis