All that came before had been fairly well advertised. Daleks in asylums, spaceships full of Dinosaurs, Wild West Cyborgs. Hell, even the next episode was shouting it's major details well in advance, what will all the angels and melodrama promised. But The Power Of Three never really gave anything away about what one might expect from the episode. Aside from the whole Doctor stuck in a domestic situation AGAIN thing anyway. What's good about this is that it means you have both some interesting mystery and less baggage in the way of preconceptions. I wasn't really sure what to expect.
So I REALLY didn't expect The Sontaran Experiment.
"Beep Beep."