Well, I'm glad that's over. Capaldi, Coleman, Anderson and the Green Earth (along with some other admittedly fine effects work) were perhaps this episode's saving graces for me. It was certainly a risky episode, being child-centric, and I suppose the kids acquitted themselves reasonably well, but I found it all a little cringeworthy, silly, and lacking in real sparkle. I guess this was one for the kids, so maybe it should have been on at 6:20 rather than 8:20. And Missy seems to be doing a kind of Anthony Ainley impression.
Anyway, from the trailer, it looks like next week's episode will be far more compelling. This has me intrigued, to say the least.