Full of flashforwards and some fresh faces 'Lost Season Four' focuses on the relationship between the freighter folk and the castaways and reveals that certain characters, who had managed to get off the island, will soon need to return... find out more...

13. Sayid and Shannon's blossoming romance threatens to send Boone over the edge until Locke, our island sage of dubious motives, forces him to confront his unhealthy interest in his step-sister while an unseen presence in the jungle stalks him from the shadows. find out more...

13. The Man from Tallahassee; Jack tells Kate that he has made a deal with "The Others" and is leaving via submarine. Locke, after having a long chat with Ben about the island's powers, blows up the submarine before Jack can leave, find out more...