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
Doctor Who Confidential the season or series in question; singular specials are not included in episode counts. Not all networks listed aired every episode, a number of them only broadcast specific specials. The first season was narrated by Simon Pegg (who played the Editor in "The Long Game") and produced and directed by Gillane Seaborne, airing at 7.45 pm. New episodes were broadcast on BBC Three immediately following the broadcast of "Doctor Who", two documentary specials were made for broadcast on BBC One, incorporating material from the Confidential episodes. The first was broadcast on the evening of the first episode, "Rose", and was