I have mixed feelings on this one. Watching it in the cinema for the first time, I thought it was excellent and very enjoyable. However, upon a rewatch, parts of it really just don't make much sense. Why was the main villain so interested in the thing they were interested in? A reason is given, but it's not a very good one. This helps to make the episode feel really quite messy.

The way the main threat is resolved was quite funny in my opinion. I then liked that there was lots of post-action after this to fully explore the outcome of the main mystery's resolution. I really liked how this was done and am fully satisfied by this resolution in a way that I don't think other potential resolutions would have suceeded with. I think I agree with the point RTD was trying to make. The final few scenes did bring me to the verge of tears a few times.

The computer-generated and practical effects are all absolutely excellent throughout this whole episode. Everything looked great.