8. What Happened To The Zygons?
They negotiated a treaty with the humans, but the story didn't really need them after that, did it? As Moffat said, this story was about the Doctor. It's not about the aliens or earth for once, and we don't need to see what happened: we trust UNIT, don't we? The Doctor saved the day and went off to sort his own life out. Which is nice, and surely he should do this more often. We'd have got to the Clara mystery sooner.