As a 2-parter, I think it is hard to review this episode stand-alone. It’s not a complete story so I think it will only be fair to form a full opinion once we’ve seen part 2. However, this is a pretty good first part. At first, I found it quite messy with multiple plots happening at once without much connection but I feel that this improved over the course of the episode. It could even be argued that this was intentional, representing how the Doctor was being pulled between multiple crises.

As a part 1, it is the job of this episode to build tension without resolving much of it in order to create a satisfying cliffhanger and I feel that that goal was achieved quite well here. I was not expecting the cliffhanger at all and it will be on my mind all week. It’s a very small thing, but the music at the end reminded me somewhat of the music in Classic Who. I don’t know if it was intentional, but I like it.

This paragraph is deliberately vague to keep this review spoiler-free. The main bit of technology in the episode felt a bit contrived and convenient. I guess that the plot had to be advanced somehow, but I feel that it could have been done a bit more naturally. Also, and I hate to say it, but I found the character of Morris quite annoying. His whole thing about probability doesn’t really work in my opinion. The other characters were good, though.

All in all, this episode has done its job in getting me invested into the story and I can’t wait for part 2. I will be seeing it in the cinema, making it all the more exciting!