Last season got a little too "ghost of the week" for me, so I've been very happy with this season's commitment to a sustained story-line.
Now if we can only get that Nazi-super-drugged demon-possessed Bloody Face vs alien showdown...
I think this season is really about how different types of evil interact with each other and the struggle for power.
You have Arden and Bloody Face which are human faces of evil (one authoritarian, one chaotic) and you have the demon and aliens which are supernatural faces of evil.
Yes, perhaps the best episode of the season (although it requires those others to make it work).
Finally we have a focus on the "insanity" of the people, not just the supernatural.
Hell Nazis are WAY scarier than aliens anyway...especially Dr. Frankenstein Nazis.