So random plot points which I enjoy
1. Companions not useless.
2. Time travel to cheat - ie the Doctor leaves clues to resolve the cliffhangar from episode one
3. Celebration of computing - the Doctor meets Babbage.
4. Celebration of interesting women through out history - cue the anti SJWs whining. I mean how many historical men does Doctor Who show? Off the top of my head, Shakespere, HG Wells, Alan Turing (in EU media), Marco Polo, King John (ok that was a robot in disguise), Van Gogh etc. There were a few women such as Queen Victoria, Madame Pompadore etc. Nothing wrong with that.
5. The Master trying his luck with some alien invasion - harkens back to classical Who eg Terror of the Autons, Timeflight (where the aliens were actually energy beings like the aliens from this episode), Claws of Axos etc.
6. The Master is back to form, as a goddamn sociopath. How he casually uses the tissue compressor eliminator to shrink and kill people. Remember when he murdered Tegan's (companion from the Tom Baker / Peter Davison's era) auntie and an Australian policeman in Logopolis. Remember how John Simm's version was a total dick. That's the return to form. If you needed a female Time Lord villainess who reforms, just go with the Rani.
![Very Happy :D](./images/smilies/icon_biggrin.gif)
Plot points which could blow up in our face
1. The Master destroys Gallifrey. Man, back to RTD's reign. Sigh. The Time Lords in my opinion would be best used if we actually had a time war and a way to show how epic things are if the TL need to be involve.
Now onto why he did it. Time Lords lied about their history. Ok, so this better be good revelation or else it would be a big let down.
Some interesting things
1. The Doctor states its low even for the Master to work with the Nazis. Come on, he works with the fucking Daleks (Frontier in Space is the obvious story line that springs to mind), and he murdered like half the universe (Logopolis). He had the Toclafane kill like all of Japan because he was a dick. Commanding a few German troops doesn't compare.
2. Useful commentary on technology and privacy. Contrast to what certain ahem anti SJW commentators think about politics in shows, they really who have no freaking idea about the show's history. Politics has entered DW numerous times. Just watch the classical episode the Sunmakers and then look up which British politician the Ursurian alien's appearance was supposed to be based on.
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I am again giving this 4/5.