The fourth series of British science fiction television programme Doctor Who was preceded by the 2007 Christmas special “Voyage of the Damned”. Following the special, a regular series of thirteen episodes aired, starting with “Partners in Crime” on 5 April 2008 and ending with “Journey’s End” three months later on 5 July 2008. “Partners in Crime” marked the debut of Donna Noble, as played by Catherine Tate, as a full-time companion to the Tenth Doctor. The series started production on 8 August 2007 and concluded on 29 March 2008. The fourth series was the final full series to star David Tennant as the Doctor, and the last with lead writer and showrunner Russell T Davies, but they would both stay until 2010, following the 2008–2010 specials. The series incorporates a loose story arc consisting of recurring mentions of the disappearance of bees from planet Earth and the loss of various planets and moons. (Wikipedia)