This morning a friend of mine e-mailed me, knowing I had been keeping up with Lost and asked me to explain how it ended. He had only watched Seasons 1 and 2. So here’s what I wrote:
I’ll see if I can sum it up. At the end of last season they nuked the magnetic source and seem to have created an alternate reality where the plane doesn’t crash and everybody ends up getting reunited in that alternate universe. When they are together they will suddenly remember they were on the island together. So Sawyer ends up with Juliette, Hurley with the girl that got shot, Sayid with the blonde chick that got shot, and Jack with Kate.
The island was being run by two immortal type guys and has a cork in the bottom that if you pull it out, all of the good things in the universe will drain out. So Jacob (good) is one of the guys and the smoke monster is the other guy (evil) but he can take a human form and ended up taking the form of Locke who had died (he was also all of the other dead people that showed up on the island). Jacob gets killed by Ben and then Jack takes Jacob’s place and kills Smokey Locke [whoops, Kate actualy kills Locke], but not before Desmond pulls the plug (not realizing the consequences) and the island starts to sink. So Jack goes in and puts the stopper back in place and saves the universe.