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
Time War (Doctor Who) Rose Tyler touching it. The Doctor later discovers that the Dalek Emperor itself had also survived, and had gone on to build a whole new Dalek race, using the organic material of human cadavers by completely rewriting their DNA. The destruction of the Emperor and its fleet in the year 200,100 during an attack on Earth at the conclusion of the 2005 series by a time vortex-augmented Rose Tyler is accompanied by her declaration that "the Time War ends". The elite Cult of Skaro also survived by fleeing into the Void between dimensions in a specialised ship, taking with them