Has The Doctor Ever Interacted with a Past 'Generation' of Himself? #DOCTORWHO #TimeTravel

Yes, in The Three Doctors, Hartnell, Troughton & Pertwee united. In The Five Doctors, the first Doctor was played by Richard Hurndell, and Tom Baker only appeared in stock footage with Peter Davidson as the 5th Doctor. The 2nd & 6th Doctor Colin Baker united in The Two Doctors, - a charity special united all the surviving Doctors and the 50th anniversary special, The Day Of The Doctor united Matt Smith, David Tennant and John Hurt as the last of the Time Lord.

the 10th anniversary special (The 3 doctors) the 25th anniversary (The 5 doctors) ... I seem to recall another one spotted in here and there... A children in need special a few years back featuring doctors 5 and 10 and of course the 50th anniversary special