This was a very fun story! But I must say, the Master's plan was very weird. He's stuck on Earth because the Doctor stole his TARDIS's Dematerialisation Circuit last episode. So the Master, instead of immediately making a plan to, you know, steal the thing back, makes a (needlessly, but that's the Master's prerogative) very complex plan to start WW3, so that he can rule the Earth in the aftermath. Was he just resigned to being stuck here forever? He only gets the circuit back at the end because the Doctor suggests an exchange, the circuit for the missile, in their negotiation. A win for the Master, sure, but out of sheer dumb luck being on his side rather than his plan actually working.

Moving on to Jo: I love her already, even though the "companion as a literal assistant to the Doctor" is not my favorite dynamic. She's just so charismatic that it works. And she got to kick some ass this time! I really like how kind she is to everybody, and how she has Benton and Yates eating out the palm of her hand. Speaking of them, both my boys had their own little arc going on in this story, which was great to see. The Brigadier was a delight as usual. As another reviewer said, they really are becoming a little family.

10/10 for the Doctor's outfit in this one, I must say. Loved how he got to be cheeky for a bit in the beginning (waving at the camera, interrupting that guy's presentation while sitting as flamboyantly as he possibly could on that plastic chair, speaking Hokkien with the Chinese delegation and leaving the poor Brigadier just sitting there). All of his interactions with the Master (no comment, I cannot not like the Master) were great as well. That little part where the Master is worried the Keller machine killed the Doctor, and when they are working together to destroy it were both very good at showing that hey, these two really were close at some point, uh? And that final phone call? Muaw, chef's kiss.

Jo betting the Doctor's ass at checkers while the Master patiently watched was so funny. Specially with the Doctor seeming to be genuinely mad that he lost, complaining that the game is "too simple" for him, and he prefers 3D chess (Star Trek reference!?). Jo/Doctor scenes I thought were great were he telling her random stories about his travels, and that exchange where, during UNIT's takeover of the prison, the Doctor makes a little joke about the hostages being in danger, forgetting that he and Jo *are* hostages; she just looks at him and he goes "...Ah" after a while. On this note, damn, UNIT sure killed a whole lot of people when they took the prison back, eh?