Ooh, that was a good episode. Very tense and it sets the scene for a very interesting second part.
Looking forward to the next one. I just wish that Capaldi had had Pearl Mackie as a companion much earlier, as well as these most recent storylines.
Really hoping that it isn't another fakeout regeneration, too. I know it's going to happen, but a second fake one would be rather annoying.
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Thinking about it, that would've been one heck of a surprise if they'd managed to keep John Simm's involvement in this particular episode a secret.