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
School Reunion (Doctor Who) include free lunches with special chips. The Tenth Doctor, under the alias "John Smith", is undercover as a science teacher in the school, and his companion, Rose Tyler, is working undercover in the school's cafeteria. The Doctor is surprised by the good behaviour of the students and intrigued by the uncommon intelligence of one of his physics students. Both the Doctor and Rose relate the mysterious events around the school to the chips: Rose observes that the chip oil has an adverse effect on the other kitchen staff, who must use hazmat suits to handle the oil, while the Doctor