The third series of British science fiction programme Doctor Who was preceded by the 2006 Christmas special “The Runaway Bride”. Following the special, a regular series of thirteen episodes was broadcast, starting with “Smith and Jones” on 31 March 2007. In addition, a 13-part animated serial (equivalent to one regular episode) was produced and broadcast as part of Totally Doctor Who. The series stars David Tennant as the tenth incarnation of the Doctor. In the Christmas special he is joined by Catherine Tate as Donna Noble. The series also introduces Freema Agyeman as the Doctor’s new companion Martha Jones, who leaves at the end of the series due to the fact that her family need support whilst recovering from the events of the series finale. John Barrowman also reprises his role as Captain Jack Harkness in the final three episodes which serve as the finale. (Wikipedia)