The others intercept the Raft and take Walt. Lock, Jack and Kate go down a hatch and find a man (who Jack knows) who has to keep pushing a sequence of numbers or the world will end. Sawyer is wounded badly by a gunshot wound from the Others on the raft.
When they get back to shore, they meet the people from the tail end who also survive. There are flashback and we see how the others have killed The tail flight survivors and there was a mole in their group.
A new character (Anna Lucia) shoots dead Shannon. Micheal is still looking for Wal, then he gets a message on the computer. We learn that Kate killed her Dad - thjats why she was on the run.
I hope I have ruined it for you know, teached u 2 post in the wrong section just so u can be "anonymous". Watching lost isnt shameful u know, theres no need to be ashamed child!