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During the Year of the Slow Invasion, when the Eleventh Doctor is bored and try to kill time by doing anything, he is put in contact with the portal but doesn't notice it as it appears in his back. The portal soon disappears like the last time and the Doctor continues his life as if nothing happened.
On the Mondasian Colony Ship, during the events of World Enough and Time, The Twelfth Doctor, Missy and Nardole take the elevator to join Bill and save her, but this portal reappears and the Doctor remembers it from the SS Madame de Pompadour. After scanning it with his screwdriver, he asks Missy if she wants to save Bill or the person that wants to reach them with the portal. Missy answers that she wants to save Bill as she is the one that is afraid of her. The Doctor stores his screwdriver back inside of his pocket and they go to save Bill. The portal will wait.
According to one account, the Master had the appearance of Roger Delgado while on Gallifrey. According to another, he had Anthony Ainley's likeness. According to another one, the one with James Dreyfus's appearance was the incarnation who ran away from Gallifrey.
While fighting to extend his life at the end of his regeneration cycle, many bodies were possessed by the Beevers incarnation, but all kept somehow reverting to his real being until he finally regenerated into the MacQueen one. Hence, these sections cannot be strictly chronological
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