WHAT NEEDS TO HAPPENED IN THE 2017 CHRISTMAS SPECIAL.
The 12th Doctor will meet the 1st Doctor and young Susan foreman in their timeline before they travel with Ian and Barbara. The 12th Doctor, 1st Doctor and Susan will then meet the John Simm Master. The 12th Doctor and the John Simm Master regenerate together in the presence of the 1st Doctor and Susan. They regenerate together because they have to work together to protect the source of energy that the time lords use to time travel that was given to them by Omega. This story will take place on Earth, pre time war Gallifrey and the antimatter universe. The 1st Doctor and Susan don’t regenerate because the task that leads up to the double regenerations is indirect from the 1st Doctor and Susan to be involved.
The 1st Doctor erases Susan’s memory after the battle because while meeting the 12th Doctor she asks multiple times where is the future Susan that should be travelling with the 12th Doctor or living on Gallifrey when they visit the planet during pre time war era of Gallifrey. The John Simm Master regenerates into Missy while he does so he frantically and haphazardly slams on different controls of the Tardis and lands in Edwardian era London which explains Missy’s clothes. When the 12th Doctor regenerates it will be the 14th regeneration and first of the new cycle of regenerations, so the doctor’s face will quickly flick from 12-1 and fade into the 13th Doctor… but before the 13th Doctor’s face becomes fully formed it will cut to the eighth Doctor being forced to watch the regenerations by the Valeyard as torture.
The 12 to 13th Doctor regeneration energy creates the power for The Valeyard to be born. The Valeyard wants the Eric Roberts Master to use as bartering power to the timelords, the Eighth Doctor final gives up and The Valeyard has the Eric Roberts Master. The Eighth Doctor is the one from the 1996 movie who has travelled to Gallifrey to hand over the Eric Roberts Master that he collected from the eye of harmony to be imprisoned. The Valeyard now has The Master but because The Master is stronger than the Valeyard he soon wangles free from The Valeyard by this point. The Eighth Doctor horrified knowing how his 12th regeneration will end he takes off in his Tardis and then through stress and the effects of torture he cut off his hair and changes into the clothes that he wears in night of the doctor, after his the eighth doctor series continues with either Storm Warning or Blood of the Daleks.
When the Paul McGann series has ran for a couple of years we catch up with the back of the 12th Doctor running into the tardis and as he turns to camera the blast of light emerges from his face and then we finally see the face of the 13th Doctor. The 8th doctor now has a separate spin off show called Doctor Who: Eighth Doctor Chronicles that’ll continue his story until to the point of the Eighth Doctor regenerating into the War Doctor.
