The episode depicts a humorous encounter between the Doctor's fifth and tenth incarnations, played by Davison and Tennant respectively. "Time Crash" was a ratings success, with a viewership of 10.9 million and a 45% share of the total television audience that night, making it both the most watched portion of the 2007 Children in Need special and the most watched Doctor Who episode since the show's 2005 revival.
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The next episode of Dr. Who is the 2007 Christmas special: "Voyage of the Damned" to be broadcast on BBC One at 6:50pm on 25 December 2007. Then we must await season four!
David Tennant is confirmed to star through to 2009. However, during the latter half of 2008, Tennant is committed to a Royal Shakespeare Company production of Hamlet. After the 2008 Christmas Special, three Bank Holiday specials have been commissioned to air throughout 2009. The programme will then return in 2010 with a fifth full series.
Russell T Davies has suggested that the programme is expected to follow this pattern, of full series interspersed with occasional year-long breaks, for some time into the future.
The Doctor will have three companions in the fourth series: Catherine Tate will reprise her role as Donna Noble, who was first introduced in "The Runaway Bride", for all 13 episodes; Freema Agyeman (Martha) will return mid-season for five episodes, and Billie Piper will return as Rose Tyler for three episodes. Agyeman will also appear in three episodes of Torchwood.
In the Doctor Who Confidential episode for "The Sound Of Drums", Davies stated that it had always been his intention to bring back classic icons of Doctor Who one step at a time: Daleks in series 1, Cybermen in series 2, and the Master in series 3. He has also stated that he is not finished and will continue reviving villains from the original series.