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 Prom (2008) were also played. The concert was conducted by Ben Foster and Stephen Bell, and performed by the BBC Philharmonic. It was presented by actress Freema Agyeman, who played companion Martha Jones on "Doctor Who". Other "Doctor Who" actors and performers dressed as "Doctor Who" monsters also made appearances on stage and in the audience. The concert included video montages of scenes from "Doctor Who" and a specially filmed "mini-episode" of "Doctor Who" called "Music of the Spheres", which was presented on a screen above the orchestra and included live interactive elements. The "Doctor Who" Prom was broadcast live on BBC