Favorite season 8 story and it's not even close. Finally some decent pacing, a cool alien concept with some weird science to boot, a bit of time travel f**kery – it's just what I like from Doctor Who. And oh my god can we talk about those costumes and set designs?? Genuinely some of my favorite work in all of the classic show up til this point.

I'm kinda surprised this one seems to be considered middling-to-bad among other reviewers, but I suppose I'm more here for the concepts than other people are – and if you're not as excited about the set design as I am this story will probably land less. My personal main criticism is that the Master didn't need to be here but that's just Season 8 in a nutshell.