 Desmond returns and we delve into his own mysterious past. We learn how he came to be shipwrecked on the island three years earlier and live inside the Hatch, and of a connection he has to another of the survivors: the man who found him and taught him for three years how to operate the computer systems is Kelvin Inman who was Sayid s handler during the Gulf War. Meanwhile, Michael leads Jack, Kate, Sawyer, and Hurley into the jungle to the Others camp to rescue Walt, while Sayid, Sun and Jin sail around the island in Desmond s sailboat to assist them knowing that Michael will betray them. At the hatch, Locke and Desmond seal off the complex with the intent not to push the button just to see what really happens, while Mr. Eko and Charlie try to pry apart the blast doors before something disastrous happens.