(S07E18) "Kim, I'm dying." - Jack

That, my friends, is what you call a game changer. Initially, I wasn't feeling the vibe of this episode. It was slow, predictable, and the Kim/Jack reunion that we've known about for ages was about as anti-climactic as you can get. But it worked. Kim's return created precisely the distraction we needed so that hour eighteen's final minutes made our jaws drops. When I spoke with Carlos Bernard recently, he said that production was shut down for over a month at one point to reassess the direction of one episode. I'm guessing this was it.