AKA: Hey Cause 4th Dimension And His Apartment Number! Clever!
I've gotten asked by people in the past what elements make a good Monster of the Week episode and the honest answer is, there's no specific elements that an episode needs. There are things that help; Unique monster, solid central performance, good hook, on top of the usual things an episode needs (directing, acting, script). But the lack of any one of those central elements won't sink an episode, and frankly having any one won't make it work. If I had to say what an episode needs to be, it's more than the sum of its parts.