So, after spending some eight months chewing over the Big Questions left by the LOST finale last May — Did Juliet really detonate the nuclear device? Will the white flash reset the clock? Will Oceanic Flight 815 avoid crashing on the island? Will our friends end up forgetting each other and never meeting? Will absolutely nothing happen? — it turns out the answer is, Z: All of the Above and More.
Jack and Faraday’s plan was to detonate the nuke within the confines of the electromagnetic pocket and “reset” the island’s timeline. And it worked. Only it didn’t.
Juliet (Elizabeth Mitchell) insisted she set off the bomb (and “It worked”), but the Swan site remained intact. At least, in one version of the story. It would appear that instead of resetting time, the blast splintered reality. I think the show began by showing us Jack (Matthew Fox) on the plane in another universe, one in which Flight 815 avoids the original White Event and lands safely in Los Angeles. Perhaps the close encounter with the island left Jack 2.0 with some kind of vague imprint that made him notice the people he otherwise would have been trapped alongside — Desmond, Rose, Bernard, Sayid, etc. It was great fun to once again see such dearly departed characters as Boone (Ian Somerhalder, now Damon on THE VAMPIRE DIARIES) and Charlie (Dominic Monaghan, now Simon on FLASHFORWARD). Mitchell will be seen again as Erica when V returns. Heck, even goofy science teacher Arzt was worth a laugh. Oh, and the island itself is now underwater.