Unless you've been living in a cave on an obscure penal colony in orbit around the planet Mondas you will know that this year we have the 50th anniversary of Doctor Who. On previous occasions we have been treated to the best efforts to give us all previous Doctors in a special. We know there is a special coming and rumours are rife but there are some obvious challenges that the BBC faces. Sadly some actors are no longer with us so the absence of William Hartnell, Patrick Troughton and Jon Pertwee gives us a particular problem. Tom Baker, Peter Davison, Colin Baker and Sylvester McCoy are still alive but would be the first to admit that the resemblance to their time as the Doctor is not as convincing as it might be. Paul McGann could readily return as the Eighth Doctor and could even give us the regeneration flashback to Christopher Ecclestone; as there was only ever one TV episode for the Eighth Doctor we don't know how he ended up looking. Given that we fans want a reunion I started to speculate on how it might be achieved...