In this episode, we get to meet Book's home planet as well as his brother. They live on a sanctuary whereas most of the planet seems uninhabitable. Even the sanctuary is being taken over by creatures that are apparently there because of Osyraa. Book's people can apparently communicate with these animals, but there's so many of them that they can't do much about all of them at once.
It's clear that Osyraa has quite a bit of power, and she's no match for the planet on their own. We don't actually get to see much of the planet itself in this episode, which is a shame. It seems like a very interesting place, and I'm especially curious about what it's like when Osyraa isn't such a threat.
Adira comes out as nonbinary in this episode! They tell Stamets that their pronouns are they/them, and Stamets is great about it, which is what I expected. It's great to see Star Trek finally have nonbinary representation. That was by far my favorite part of the episode.
To be honest, I wasn't as into most of this episode as I have been other episodes this season. I can't pinpoint exactly why that is, but it just didn't hold my attention in the same way, which is sad since I've loved the rest of this season so much.
They figure out that the Burn originated from a nebula, so we're one step closer to having some answers. I'm excited to see what comes next.