Man, I love this one. Objectively, it's not the greatest in terms of plot, and the resolution is a bit of a letdown, but the vibes are impeccable. A two-part bottle episode created to fill a gap in the episode count has no right being this good, but the entire cast put their absolute all into the performance, and the result is a fantastic psychological thriller and character development for the whole crew (with the possible exception of Susan, who just gets to go feral, but that is the right of all teenage girls).