The BBC's Doctor Who website has confirmed that Michelle Collins, best known for her role as Cindy Beale onEastEnders, has been cast in an upcoming Doctor Who episode.
Collins will appear in episode 7, written by Chris Chibnall and directed by Graeme Harper. Her character is named McDonnell.
More casting information, and the title of this episode, will be revealed in Doctor Who Magazine #379, released on newsstands in the UK tomorrow (1 February).
UPDATE: The title of episode seven has been announced as 42. Show head Russell T Davies is quoted in DWM as saying: "Yes, spelt with numbers not letters!"
According to DWM, the episode will also feature William Ash playing Riley, Matthew Chambers (Korwin), Anthony Flanagan (Scannell), Gary Powell (Ashton), Rebecca Oldfield (Erina) and Vinette Robinson (Lerner).