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[personal profile] jack
This episode was really good. It packed a lot in without feeling rushed, it used time-travel in interesting ways, it felt serious and as if what happened actually mattered, it was genuinely scary at least some of the time, it was fun and several great characters had real chemistry between them, it was funny, it continued developing a great monster from previous episodes, and the plot didn't fall of the rails half way through.

Generally, my only criticisms would be small-ish things that could be improved, and things that could be even better. (I expect more flaws will occur to me later.) But I would note it does repeat a couple of ideas that New Who has used before to good effect: that's a natural thing to do, and works quite well, but they've reached the point where I'm definitely conscious of them.