To be honest, I thought that this episode was kinda okay-ish...until they threw in the Stockholm Syndrome crap. Okay, I know that I don't have a BA in psychology like you and even though I got a "C" in that class back at my old college 3 years ago...I know at least enough to say, "Wait...what? Seriously?! You're throwing in Stockholm Syndrome just like that? You guy's do realized that that would actually made a lot more sense if she had been held against her will by that guy before for several weeks if not years, right?!"

As for the darker theme by killing the vet...I didn't mind that part so much. Kinda gives a valid reason for both Ben and Gwen to believe that "You don't have to be an alien to be a monster" in my opinion.