I think that Lux might be one of the most creative and interesting televised Doctor Who episodes ever. If you've not watched it and you're reading reviews, please stop reading and just watch it. This subverts so many expectations and is just so much fun, and even the hint of a spoiler could ruin it quite a bit at points.

This episode relies a lot on special effects and, on the whole, I think that they were done really, really well (Mr Ring-a-Ding looked great!), althought there were a few bits I thought were shaky (mostly, the bit when the Doctor and Belinda are in the film but live-action as it looked a bit too much like it was just a greenscreen). I felt that the music was also pretty solid, and I didn't notice anything I disliked with the directing or acting. The plot itself was super interesting and unique, and I feel that this is really where Doctor Who shines: telling creative stories that other shows would really struggle to tell. I had high hopes for this episode, and they were smashed out of the park in this area. I also felt that the characters were a large step-up from the previous episode. I actually felt emotionally invested in them, and I felt sad and happy for them as the story progressed, which I think is quite impressive for 45 minutes. The next bit I'm going to say is a massive spoiler. Please do not read it if you have not yet watched the episode. You will ruin it for yourself. I feel that the real stars, character wise, were the Doctor Who fans from that crazy fourth-wall break bit. I felt that these in particular worked really well because, even though they're new characters, they're really not: they're me, and you, and all of the other Doctor Who fans across the world, and I felt instantly like I knew them, understood them and emphasised with them. Honestly, they're possibly the most represented I've ever felt in a piece of fiction.

While I'm doing spoilers, here's another spoilery thought that I want to share: the scene where the film cans were set on fire hit possibly a bit too close to home for me, considering Doctor Who's history of episode junkings. I do wonder if it was deliberate.

While this episode is mostly fun, it also has stuff to say about racism which I thought was interesting and well-done. I don't really have anything else to say here, but I wanted to slip it into this review somewhere.

Overall, I can't think of anything else like this. I've not given it a perfect 5 starts due to my minor quibbles with the VFX, and also because I don't really like the direction of the ongoing Gods of Chaos arc, and would have rathered this was standalone to that, but that's really me nitpicking more than anything. This is really good.