Doctor Who TV reports that indeed Zygons and UNIT are appearing in a massive two-parter. And apparently it involves children as well; a scene was filmed at a playground, with area schoolchildren having the time of their lives being roped in as extras. Whatever the Doctor’s getting into, it seems exciting, and there are pictures at the link at the start of this post.
But as an Osgood fan, I was delighted to see that she’s sporting yet another cosplay: she’s got a bit of Seven going on now. I suspect the lady in the background, with the question-mark lapels, is her stunt double, but that’s just guessing. Subtext: she must have some action scenes if she’s got a stunt double! AWESOME!