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
History of Doctor Who the Canadian Broadcasting Corporation leaked a rough cut of the premiere on the internet; the leak attracted much media attention and discussion amongst fans. Advance reviews in the British media were generally positive. "Rose" finally saw transmission on 26 March at 7 pm on BBC One, the first regular episode of "Doctor Who" for over 15 years. To complement the series, BBC Wales also produced "Doctor Who Confidential", a 13-part documentary series with each episode broadcast on BBC Three immediately after the end of the weekly instalment on BBC One. "Rose" received average overnight ratings of 9.9 million viewers, peaking