"Do No Harm"
Air Date: 04/06/2005

We pick up right where we left off, as Jack works to save Boone, who was crushed in the Beechcraft he and Locke found out in the jungle. Jack enlists help from Sun and sends Kate for Sawyer's alcohol stash, when Boone's lung collapses. Jack acts fast, pours some alcohol on Boone's chest and uses a knitting needle to puncture the lung and temporarily remedy the situation.

Off Jack, we FLASHBACK to a tuxedo shop, where Jack ties a bowtie on his friend Silverman (his childhood buddy way back in episode #103). When the tuxedo manager comes out with a jacket for the groom, Silverman points to Jack and we realize that Jack is about to get married.

Back at the caves, Jack examines Boone's legs to see they're fractured and that he's lost a lot of blood. Boone begins to come around; convinced he's going to die. But Jack tells him he's not going to die. Why? Because Jack is going to save him.

At the beach, Claire finds Sawyer, Michael and Jin at the raft and asks when it's going to be ready, clearly anxious to get off the island. Kate rushes into the scene and tells Sawyer that they need his alcohol for Boone. She explains that Boone was injured while out hunting for boar. But Sawyer points out that they haven't been getting any boar lately, casting some doubt on Locke's story.

Meanwhile, Jack works to sew up Boone's chest and concludes that he needs a blood transfusion. And as Jack steps out for some air, debating what to do, Charlie approaches, peppering him with questions and causing Jack to snap, as we...

...FLASHBACK to Jack, on his cell phone, trying to reach his Dad. Silverman interrupts and tells him to come back inside to his rehearsal dinner for the toasts. And this is where we meet Sara, the bride to be, who gives a toast so flattering, it makes Jack uncomfortable. We learn that Sara met Jack because she was in a car accident -- an accident so bad she was deemed irreparable. But Jack promised he would fix her and he did just that -- because when Jack says he's going to do something, he does it. And Sara raises her glass to the most committed man she's ever known -- Jack Shepherd, her hero.

Back on the island, Kate rushes back to camp, trips and breaks some of the alcohol bottles. She stops to pick them up when she hears something in the woods. She follows the sound to find Claire, all by her self and clearly in labor. Kate calls for help and insists they get to Jack, but it's painfully obvious that Claire can't make it.

Meanwhile, Sun rouses Boone to tell her his blood type -- A negative. Jack is frustrated that he doesn't even have a needle sharp enough to do the transfusion. While he tries to figure something out, he sends Sun to find Shannon and Charlie to find someone with the same blood type. Shannon, however, is nowhere to be found because she is out in the jungle with Sayid, who has set up a romantic picnic for the two of them.

On the beach, Jin hears Kate's calls for help and rushes to find them. And no language barrier in the world could hide the fact that Claire is about to give birth. Kate sends Jin to the caves with the alcohol and tells him to return with Jack, while she stays with Claire.

At the caves, Charlie returns with bad news -- he found a type A, but isn't sure if it's positive or negative. He hasn't had much luck in general -- nobody knows their blood type. Sun returns with better results -- she didn't find Shannon, but she did find a sea urchin, the needle of which is hollow and sharp enough for Jack to use in the transfusion. Jack announces he'll do it on himself: he's O-negative and that's universal. Jack assures Charlie and Sun that while it's dangerous, Boone is not going to die.

FLASHBACK -- to the hotel bar, the night before Jack's wedding. Sara joins him at the piano as he toys with the keys. She offers him an out by saying, "You don't have to do this…" And we soon realize that they are talking about their vows -- vows which Sara has already written, while Jack is having difficulty finding the words. Sara is loving and reassuring and tells Jack that with or without vows, she can't wait to marry him. She tells him she'll be upstairs while Jack continues to wait for his father.

Back on the island, Jin arrives at med tent to find Jack mid-transfusion. He immediately locks eyes with Sun. Despite the fact that they aren't speaking, he knows he's going to have to rely on her to translate. He tells Sun, who tells Jack and Charlie, about Claire's predicament. But Jack can't leave -- he's got a literal lifeline to Boone. More importantly, he won't leave -- he made a commitment to save Boone. And with these two emergencies converging, Jack snaps into leader mode and instructs Charlie to wait until the contractions are sixty seconds apart before instructing Claire push. Kate is going to have to deliver the baby on her own.

Back with Claire and Kate, the contractions have stopped and Claire assumes it was false labor. But the relief is temporary, because her water suddenly breaks. Claire panics -- she can't have the baby now! Not here!

In the med tent, Boone comes to momentarily and tells Jack all about the plane. But Boone is groggy and Jack thinks he might be referring to Oceanic Flight 815. One thing is clear -- Boone tells Jack that plane fell on him. He's also clear when he mentions the hatch and the fact that Locke told him not to tell anyone about it. And now Jack is completely confused. Before he can get any clarity, Boone drifts back out of consciousness, mumbling Shannon's name.

And we find Shannon, at the beach with Sayid. It's romantic and they share a kiss. But before it goes any further, she confesses that Boone is her step brother -- and that he's in love with her. She assures Sayid the feelings aren't reciprocal -- she just wanted him to know. She wants to take it slow, because if things don't work out it would be pretty complicated being stuck on an island together. "It could be bad." Sayid tells her it could also be wonderful.

Back in the jungle, Claire's contractions are getting more intense. Charlie returns and tells Kate that she is going to have to deliver the baby solo. Meanwhile, Jin tries to comfort Claire, who is afraid that while she was out in the jungle alone, her captors did something to her baby.

At the caves, Jack is further frustrated when he realizes the transfusion isn't working because Boone's injuries aren't from a fall -- something crushed his legs. Angry, he tells Hurley to find Michael.

FLASHBACK to Jack, sitting poolside at a hotel at night -- his feet in the water, a drink at his side. He looks over a piece of paper when his father, Christian, joins him. Jack explains that he's looking at Sara's vows -- he took them from her room because he's having so much trouble writing his own. Christian looks them over, impressed, but concerned for his son. He asks Jack if he loves Sara; then if she loves him. Jack responds yes to both questions. But what it really comes down to is fear -- fear of not being a good husband and father. He wants his dad's opinion -- should he marry Sara? Christian points out that commitment has always been Jack's strong point -- but his weak point is that he doesn't know when to let go. And as Jack considers his father's words, we ...

... shoot back to the island, where Jack tells Michael that Boone's leg is dead and filling with blood and that he needs to amputate. He can't use the axe, so he wants Michael to rig a guillotine.

Meanwhile, Jin leads Charlie away from Claire because she's about have the baby. Kate instructs her to push, but quickly realizes that she's doing the exact opposite -- Claire is holding the baby in because she's scared. Kate tells her that she's not alone. Everyone is going to be there for her. And with a newfound confidence, Claire begins to push…

At the caves, Jack faces the horrible task that lies ahead of him, while Sun pleads for him not to do it, feeling that Boone would be better off left to die peacefully. But Jack has shut himself off to the emotion and continues to prep Boone for amputation.

We FLASHBACK to the big wedding day, where Jack stands with Sara as she gives her vows. But when it comes time to deliver his own, he hesitates, scaring his bride for a tense beat when he explains that he's not good at letting go…he's stubborn…afraid to fail. And just when we think that Jack might actually take his fathers advice and back out of this marriage, Jack turns and tells Sara that after her accident, he didn't fix her, she fixed him. "We can do this. I love you and always will." And as the happy couple kiss we go ...

... back to Boone, the blade about to drop. He calls Jack's name, stopping him in the process and asking Jack to let him go -- he knows he's all messed up inside. Jack's conflicted and doesn't want to give up. But Boone begs until Jack final relents and moves him out of the guillotine.

Meanwhile, Claire delivers a final push and gives birth to a healthy baby boy. Charlie and Jin celebrate. And as a new life enters the island, another one leaves -- Boone takes his last breath with Jack watching over him….

Back on the beach, the survivors celebrate the birth. But the celebration is cut short for Jack, who has to face Shannon when she returns with Sayid, oblivious to the fact that her brother is dead. While Shannon mourns over Boone's body, Kate goes to Jack to see if he's okay. Jack is oddly cold, packing his backpack as she speaks. "Boone died, Jack." Jack retorts, "Boone didn't die, he was murdered." And with that statement, Jack heads out. Kate asks where he's going and Jack responds, "To find John Locke…"