15. JIN IS DEAD?
Episode 7: ''Ji Yeon''

Building on the flash-forward twist of last season's instant-classic finale, season 4's future-set Oceanic 6 episodes were all pretty killer, establishing new mysteries and new emotional stakes for the show. Among the most memorable flash-forward moments: Sun taking her newborn daughter, Ji Yeon, to Jin's grave. Is the marker a ruse — or is Jin truly marked for death? Perhaps tonight's season finale will give us an answer.