Every season of television has that one episode known as the “shit goes down” episode where all the plot threads converge, conflicts flare up, and/or everything falls apart, and “A Sin to Err” is that such episode for Agent Carter.…

Now this is more like it. After weeks of only scattered fight scenes here and there, Agent Carter delivered its most action-centric installment yet, and arguably its best so far, with “The Iron Ceiling.” Not only that, but the show finally…