We watch "Ascension of the Cybermen" (Series 12, Episode 9) where the Doctor and Fam travel to the distant future and find the absolutely, positively, finalist of all final humans (for reals this time... wink) holding off an attack by Cybermen. Cybermen who are attempting (rather successfully) to kill them all off. But, but, but don’t they like to assimilate humans? Anyways... the episode ends on a cliffhanger where the Master pops up all whilst other stuff happens prior to that big reveal.