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
The Runaway Bride (Doctor Who) the Earth by gradually and secretly poisoning Donna with an alien particle the Racnoss use as an energy source. The Tenth Doctor, still saddened by his separation from companion Rose Tyler, is shocked when Donna Noble, in a wedding dress, appears within the TARDIS while in flight, a near impossibility. She angrily demands to be returned to her wedding as the Doctor performs several tests on her before materialising the TARDIS on Earth, though across the city from the ceremony. Donna leaves in a huff and takes a cab, but the Doctor observes a robotic Santa Claus is driving the