This episode was my favorite of the season. (And now my number 2 favorite of the series behind Fifteen Million Merits.) Also, I think it goes to show that while people compare Black Mirror to The Twilight Zone, its moral worldview is a lot closer to Tales from the Crypt. I mean, you can get an idea of what is coming, but there's some moments where you think that it can't possibly be as bad as you expect. Like, the unit commander is talking to the sympathizer civilian and talking about the danger of the roaches' blood and you think maybe there really is some deadly genetic condition that isn't necessarily visible and the powers can almost have some twisted justification for what they do. That would probably be the Twilight Zone version. But no, this is fucking Black Mirror. It's just straight-up Nazi-level eugenics. Explicitly and unquestionably evil, and our protagonist has to live with it. Damn. (Also little moments in the episode that hit much harder on re-watch, like how one of the soldiers talks about how dumb the country folk are because in the cities they managed to stomp out all the roaches quickly and without issue.)