If Tom’s Doctor had taken part in The Five Doctors, the original plan was for the Hurndall Doctor to stay in the Tardis with Turlough and Susan while Doctor Davison went to the Tower. Doctor Tom was meant to be the one who met the Cybermen & the Master and got transmatted to the Capitol and Doctor Davison was to make the trip to the Tower that Hurndall’s Doc did on TV.
It made sense to stick to the original plan as much as possible so in this version Hartnell’s Doctor stays behind in the Tardis while Tom heads to the Tower. And yes, I’ve replaced Richard Hurndall with William Hartnell – if you’re going to do it, then do it right.
This is The Real Five Doctors!