Speculation is rife that the BBC’s forthcoming Doctor Who 50th anniversary episode could feature all of the actors who have played the title role.

The seven surviving incarnations of the TV time lord – who include David Tennant, Christopher Eccleston and Tom Baker – have reportedly been approached about appearing alongside current Doctor Matt Smith in the show, to be screened in November.

The line-up would be completed by Colin Baker, Sylvester McCoy, Paul McGann and Peter Davison.

The other three actors who played the role – William Hartnell, Patrick Troughton and Jon Pertwee – have all died but could appear in flashback or with the use of new screen trickery.

The plans for the show’s anniversary – which will include a one-off drama about the history of the show – have also raised questions over Matt’s future in the role.

The actor recently landed his first US film role in How To Catch A Monster – the directorial debut of actor Ryan Gosling – but has said he has no plans to quit the Tardis any time soon.

“We’ve got Doctor Who’s 50th anniversary coming up in November 2013, and I’d hope to be part of it.”

“All good things come to an end, but my mum is aghast at the thought of me ever not being the Doctor. 
The show is the star and will continue without me. I’ve no immediate plans to leave. I’m around for a whole year and that’s a long time.”