Christopher Eccleston - Journey To TheCentre Of The TARDIS

How true this is I do not know but, Christopher Eccleston will aparrently feature in upcoming 'Doctor Who' episode 'Journey to the Centre of the TARDIS', when the Ninth Doctor's voice is heard as a space crew try and break into the TARDIS. 

Christopher Eccleston is returning to 'Doctor Who' - as a voice from the past. The49-year-old actor was rumoured to be coming back for the sci-fi show's 50th anniversary episode in November but decided not to reprise his role as the Ninth Doctor.

However, he will feature in next week's episode 'Journey to the Centre of the TARDIS', which focuses on a spaceship salvage team which captures the TARDIS.

As they try and break into the time-travelling machine viewers will hear the Ninth Doctor's voice say, "The assembled hordes of Genghis Khan couldn't get through these doors, and believe me they've tried."

It is a line from 'Rose', which was the first episode of the new run of 'Doctor Who' which began in 2005 and starred Billie Piper as the Time Lord's companion Rose Tyler.