Really enjoyed this story! Everyone was fantastic in this! I haven't a bad word to say, other than that it could perhaps have done without the padding of episode five, but honestly I loved this story.
There's loads of character right from the beginning, even from the guest cast - no shoddy acting either! Once again, some great interactions between the Doctor and Jo. And wow... The Master was brilliant in this story.
There were some great cliffhangers in this story, particularly episode three. It was brilliant to see the Brigadier sound genuinely concerned and upset for the safety of Yates and the rest of his men. Not everyday you get that from the Brig!
Ruth and Stewart were characterised and performed superbly. Not sure how to feel about Ruth's feminist remarks though... On the one hand, it's good to see a strong female character talking about gender issues in '70s Who, but on the other hand she's just as sexist as the next person with comments on the lines of "Oh you men are all the same," etc. But such is life I suppose...
Ignoring that though, this is a brilliant story that flows nicely and kept me entertained throughout. The ending made me smile, too. Full of great character and performances, and the plot is fun and enjoyable. Possibly my new favourite for the Pertwee era.
5/5.