Shannon has found her belongings and retrieved a bikini to take advantage of the sun. Boone arrives to tell her that he and the other survivors are going through the wreckage and salvaging everything they can. She makes it clear that she has no intention of helping. What's the point, they're going to be rescued any minute, right?
Jin wades through the tide pools gathering sea urchin. Sun is watching from the beach when Michael arrives to ask her if she has seen his son, Walt. Jin overhears the conversation and chastises Sun for having the top button of her sweater open.
While searching the woods for Vincent, Walt stumbles across something lying on the ground. Michael catches up with him and scolds him for running off without telling him. Michael shows his father what he found ... a pair of handcuffs.
And as we're wondering where those cuffs came from, we catch up with Jack, Kate and Charlie who appear to have escaped whatever was chasing them. Kate asks Charlie what he was doing in the bathroom of the cockpit. Charlie confesses he was throwing up, but we soon learn this isn't true. Charlie left something in the airplane bathroom just before the crash. Something he was desperate to get back.
Back at the beach Sawyer and Sayid are in the middle of a brawl and it's all Jack and the others can do to break them up. Sawyer is convinced that Sayid is a terrorist and responsible for the crash. But when Kate asks if anyone can fix the transceiver, Sayid is the only one who is able to help. How? He was a military communications officer. Sayid goes off to fix the transceiver as Jack is called to tend to a horribly injured survivor who needs an operation to remove the piece of wreckage from his abdomen.
Hurley learns that Sayid saw action in the Gulf War. Not in the Air Force or Marines, but The Republican Guard! He gets the transceiver working, but can't get a signal. He tells Kate he has an idea ... If they can climb that mountain they might get a signal at high ground.
Elsewhere, Boone lays into Shannon for being incredibly selfish. She lashes back at him and tells her brother that she is going on the hike to find high ground with the others. Knowing she won't change her mind, Boone goes along to look after his sister. Charlie and Sawyer decide to join the group at the last minute.
As the Signal Party climbs the steep slopes of the mountain, Jack asks Hurley to search the luggage for antibiotics while he looks for a blade he can use to operate. Along the way Jack runs into Michael and tells him he saw Vincent in the jungle earlier.
Walt, wandering alone, without his dog, comes upon Locke placing the pieces on his backgammon board. Walt's curiosity gets the best of him. After teaching Walt the history of backgammon, Locke asks Walt a very creepy question: "Do you want to know a secret?"
Jin, who has been handing out the sea urchin he caught, finds Claire sitting alone writing. Soon after swallowing the food she feels her baby kick for the first time since the crash. In the joyful realization, Claire admits that she thinks of the baby as a "He."
Meanwhile the Signal Party is walking through a new stretch of jungle. Just as Sayid and Sawyer are about to go at each other again, they discover that they have bigger problems. Something big is out there and it's coming their way. They all turn to run; all except Sawyer that is who pulls a gun out of his belt and fires at the charging animal until it falls dead at his feet. We get our first good look at what came at them. But there must be some mistake. We're on a tropical island...and that's a polar bear!
Jack begins his operation to remove the piece of metal from the belly of the survivor. Hurley tries to help but faints at the first sight of blood.
Back in the jungle, Sawyer explains that he got the gun off on one of the bodies. And guess what, he took the guy's badge too. There was a US Marshall on the plane and that would suggest a prisoner was being transported. But who was it? As Kate takes the gun apart and divides the pieces among the group we get to see her memory of the crash. And in the process we learn that Kate is keeping quite a secret herself.
In the middle of his primitive surgery, Jack's patient regains consciousness. He is consumed by one question: "Where is she?"
At high ground, the group is finally able to get a signal, but they can't transmit because something else is already transmitting. It's difficult to hear, but it sounds French. It's a distress signal that has been playing over and over for a very long time. Shannon spent a year "studying" in France and is called upon to translate. But what they learn is more terrifying than anything they could have imagined...