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Flashing Forward, Season Three
One of TV's greatest head-fakes ever, this game-changing episode, on which the entire series pivots, revealed that what we thought were flashbacks of Jack falling apart back at home were actually flash-forwards. Amid such wrenching emotional moments as Hurley's microbus charge and Charlie's prophesized sacrifice of his life to save his friends, we learned at last that at least some of the castaways would be rescued, but that there was still plenty more mystery, heartbreak, and awe in store for them all. —Gary Susman
