Two: The Glass Ballerina
Learned: Sawyer and Kate were apparently kidnapped due to the others lack of manual labor. They are taken out to break rocks for the day. The others find out about the
sailboat and go to retrieve it. Jin reveals he is starting to understand English fairly well. Sun shoots an other named Colleen who eerily knows Sun's full name. Ben tells Jack that he will take him back to his life off the island if he cooperates. He also claims that he has lived on the island all his life. To prove they have contact with the outside world, Ben brings Jack up to date on current events and shows him a tape of the world series.
Flashback: Sun. She cheated on Jin with Jae Lee, the hotel guy, and her father told Jin to kill him. He didn't, but Jae wound up committing suicide.
What do we know about the others: They are baseball fans.