Ron Moody could have been the Third Doctor in 1969 . He was offered the part but turned it down.
It was said to be his biggest regret, but it would have been interesting to see his take on it.
Would he be as socially awkard? At least he could be ginger, the doctor has always wanted to be ginger.
Would Oliver Reed, take a role in one episode, as a stubborn alien, who only the doctor can perswade to change his mind of destroying Earth.