The BBC have now confirmed that the Tenth Doctor David Tennant will star in the 50th Anniversary episode of Doctor Who.
The news leaked earlier today thanks to a mistake in the distribution of Doctor Who Magazine, which saw subscribers receive their issues 5 days early, forcing the BBC to issue a hurried press release. Tennant will join current stars Matt Smith and Jenna-Louise Coleman in the special episode.
Also joining the cast will be the Ninth and Tenth Doctor's companion Billie Piper.
Tennant played The Doctor from 2005-2010, appearing in 47 episodes of the series, while Piper played Rose Tyler for the 2005 and 2006 seasons, along with cameos in later episodes.
DWM also reports that international film star John Hurt will join the cast for the special episode, which begins filming next week.
John Hurt is one of the UK's most respected actors appearing in films such as The Elephant Man, where he played John Merrick, Nineteen Eighty-Four where he played Winston Smith and Scandal where he played Stephen Ward. On Television he is best known for playing Caligula in the renowned I, Claudius and Quentin Crisp in The Naked Civil Servant. His distinctive voice has been used in many productions such as Watership Down and the animated The Lord of the Rings.
He has received two Academy Award nominations, a Golden Globe Award, and four BAFTA Awards.
It is expected that the special episode will be transmitted on Saturday 23rd November, 50 years to the day since the launch of Doctor Who.