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...

4. Eggtown; Kate tries to get information out of Miles, which in turn compromises her relationship with Locke and Sawyer. find out more...

8. Meet Kevin Johnson; Locke holds a meeting declaring no more secrets. find out more...

12. There's No Place Like Home Part One; the Oceanic 6 are dispersed across the island and in trouble. 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...

5. The Cost Of Living; after having a vision of his dead brother Mr Eko sets out to return to the site of his plane crash. find out more...

9. Stranger in a Strange Land; Sawyer, Kate and Carl reach their island at night. Jack is interrogated by "The Others" constable Isabel about the incident with Juliet and, when she asks the meaning of his tattoo, he recalls his vacation in Phuket, Thailand, where he dated the sexy, mystic and mysterious Achara. Ben has an infection in his spinal column and Jack negotiates the freedom of Juliet, who was going to be sentenced to death for Pickett's murder. Later Jack recalls what happened to him w 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...

17. Catch-22; Desmond's latest fragmented vision suggests that his old girlfriend, Penny, will crash-land onto the island. He organizes a posse of himself, Hurley, Jin and Charlie to come along with him into the jungle expecting Penny to parachute onto the island, but the vision also suggests that Charlie will die if he goes with them, but Desmond insists that Charlie must come along to make the vision come true. Desmond recalls his days in a monastery in Scottland over 10 years earlier. In the find out more...

21. Greatest Hits; Desmond has another vision of Charlie's death, but this time his death will result in Claire's rescue. The survivors discover that an attack by "The Others" is even more imminent than expected. find out more...