Martha's family are cast.
DJ and former Top of the Pops presenter Reggie Yates will feature as Martha Jones's brother Leo in Series Three of Doctor Who.
Joining him to complete the Jones clan are Trevor Laird, who will play dad Clive, Adjoa Andoh as mum Francine, and Gugu Mbatha-Raw as sister Tish.
Former Casualty actress Andoh previously appeared as cat nun Sister Jatt in the episode New Earth. Laird is a Who veteran too, having played Frax in The Trial Of A Time Lord twenty years ago.