have to say im really not sure where "The Power of Three" comes from, I dont think the idea that the Doctor, Rory and Amy are best as a unit, it was highlighted all that well, or at all in the episode. The half in, half out approach, the Ponds have continues to do nothing for the show.
I always thought this was a poor produced plot, why is it that over a year, the cubes were just left where they were, be that in bins, or knife and fork containers, and oddly in hospitals. Seriously could the production not have moved them around a bit.
I also do not buy that they just be left around for a year, people would have gotten bored, and put them in the back of the cupboard.
As for the Brigs daughter, I guess its nice, but seems a little forced and out of no where, I mean has she ever been mentioned before?
The talk of this being child friendly, well it would have made a decent Sarah Jane Adventures plot.