A joy and a fear
This episode was a joy. Clara finally being able to go back to ass-kicking goodness instead of that slushy love puppy crap. I also enjoy the Reg reviews - a billion year old regenerating time lord in a sixties style police box, no problems. Weird 2D/3D aliens? Nah, we're not buying that...
The thing is, I have a great fear that the underlying storyline with Missy is going to turn out to be a great big misfire. If this is ultimately Clara's goodbye, then we really need to have Clannad-style feels going on, instead it will be some hokey rushed alien-induced soap opera like Rory/Amy and the Angels. A brief "wah!" and it is all but forgotten. Clara deserves better.
On the whole, obvious plot rubbish aside, this was one of the better episodes because Capaldi wasn't being gloomy and pushing the plot in the wrong way, and also because it didn't try to be anything it wasn't. [oh the epicness of a train in space that is really a lab to try to .... mummified soldier? seriously? omfg what a wasted opportunity]