I love that finale. It's among my favorite for sure. It's just a roller coaster, emotionally and mentally. I remember jumping out of my seat when Olivia was killed. That scene between Peter and Walternate is so tense. It gets me every time. You can really tell though that the writers spent a great deal of time thinking about this far ahead. Everything from season 2 to season 3 fits perfectly in place as far as the main story goes.