As the Doctor Who 50th anniversary is currently filming, fans are anxious to learn more. David Tennant has already confirmed that he will be a part of the program while his predecessor Christopher Eccleston has confirmed that he will not. However, what about the Doctor of old? Many are hoping to see the surviving actors who have played the adventuring Time Lord Tom Baker, Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann alongside the new versions of the Doctor, but it seems that is not to be, at least for Doctors 6-8.
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Former Doctor Who stars Colin Baker, Sylvester McCoy and Paul McGann have revealed that they definitely won't be appearing in the BBC sci-fi drama's upcoming 50th anniversary episode, largely because they're currently in the wrong hemisphere.

The anniversary special is being filmed in this country as we speak, but seeing as the Sixth, Seventh and Eighth Doctors are all in Australia attending sci-fi conventions at the moment, they won't be able to take part. (via RadioTimes)

While this isn't exactly definite word that the previous Doctors will not be seen in the special (perhaps CGi will be used), it isn't a good sign for anyone looking for a proper celebration as we had back in 1983 when Patrick Troughton and Jon Pertwee returned to play the part.

Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann, Doctor Who 5-8

Peter Davison, Colin Baker, Sylvester McCoy and Paul McGann, Doctor Who 5-8