The Mirror have stated that all Eleven Doctors will be appearing in a scene produced for this year's Children in Need due to air in November. An apparent insider said;
"This is a momentous episode for all Doctor Who fans. Never before have all the Doctors been in the same room, let alone in the same show. The script has already been started and it’s classic Doctor Who - really witty and very sharp. Viewers will see the Time Lords regenerating and emerging one by one from the TARDIS, each with their own quirky opening line."
This has not yet been confirmed by the BBC and is highly unlikely that this will happen as most of the classic Doctors are dead or they look different, and that just wouldn't work!
What are your thoughts on this?