More of an emotional episode than an action one, this very much gives some good closure to many of the characters, while leaving the door open for returns. The Cybermen are again great here and there's some nice tying together of all the different origin stories, so to speak. Capaldi's Doctor is a bit moany through much of this, but as a way to 'die' – although he hasn't quite gone yet – it's a superb one. Two Masters were pretty good fun, but not as much as it could have been.
Another great ending though; Christmas will be very interesting indeed.