Missy, Master. How did I miss that?
I have to admit, there being two plot twists was something I wasn't expecting. I called "Cybermen" as soon as we saw the sitting skeletons and the Doctor mused about who'd want to keep corpses in such a condition. But the return of the Master, that one took me by surprise.
Generally speaking, you don't expect the Doctor's antagonists to work together, not unless they're coming together in an army of doom to murder him. (And you don't expect the Master to work together with anyone, period.)
Still, this all could have been avoided if the Doctor hadn't forgotten his standard dodge for the "my friend is dead, but if I go save them, the events that made me go save them won't have happened" paradox, that being to simply fake the dead person's death.
And re: Danny having shot a boy? Well, yes, that was a bit cliched, but powerful. It would have been gutsier, cinematically speaking, but probably less sympathetic to most audiences, if instead he'd shot an armed combatant.
Biting the hand that feeds IT
