A lot of information was revealed in the most recent episode of LOST, "Happily Ever After". Finally, some light has been shed on the true nature of the Flash-Sideways Timeline (hence force referred to as FST) and how it relates to the Original Timeline (OT).
For a moment, let's assume that the FST exists solely because of "The Incident" as depicted at the end of Season 5. Up until this point, the entire series of LOST had existed in one timeline, or one reality. Certain characters have travelled through time, but they have stayed solely within the same timeline they always had.
"The Incident" changed this. The detonation of the Atomic Bomb created a split in time, and a second reality; the FST. Therefore, prior to "The Incident" there w…Read more >