| Doctor Who | |
|---|---|
| Series 4 | |
 DVD box set cover art | |
| Showrunner | Russell T Davies |
| Starring | |
| No. of stories | 10 |
| No. of episodes | 13 (+1 special) |
| Release | |
| Original network | BBC One |
| Original release | 5 April – 5 July 2008 |
| Series chronology | |
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. The series incorporates a loose story arc consisting of recurring mentions of the disappearance of various planets and moons.
"Partners in Crime" marked the debut of Donna Noble, as played by Catherine Tate, as a full-time companion to the Tenth Doctor, after she first appeared in the 2006 Christmas special, "The Runaway Bride". Freema Agyeman also returns as the Doctor's companion Martha Jones from the previous series. John Barrowman, Elisabeth Sladen, Noel Clarke and Camille Coduri also returned to appear in the series finale, as well as Billie Piper, who appeared as Rose Tyler in six episodes of the series.
The series started production on 8 August 2007 and concluded on 29 March 2008. A short Children in Need special titled "Time Crash" was also produced and set before "Voyage of the Damned", as well as a mini-episode entitled "Music of the Spheres", which premiered at the Doctor Who Prom after the fourth series finale in July 2008. The series was the last to star David Tennant as the Doctor, but he remained as the Tenth Doctor in a series of hour-long specials in 2009, and appeared as the Fourteenth Doctor in the 2023 specials. It was also the last regular series to feature Russell T Davies as the lead writer and showrunner until the fourteenth series.