So, there we have it! The big reveal is out there and we know exactly who Missy is. Missy has been following the Doctor’s adventures for quite some time now, is actually the Gallifreyan evil genius The Master – We don't have all the answers yet, but I'm sure we'll be getting them in this week’s series finale ‘Death in Heaven’.
Overall this episode set up what is sure to be monumental finale. Questions on Seb's identity, the point of the Gallifreyan Hard Drive and how, if at all the Doctor can beat Missy are sure to be answered, but right now I'm happy with what this episode achieved and has gone down as one of the most memorable of the new series in my opinion. 9/10.