Lost Episode 3.16 One of Us

Kate, Sayid, Juliet, and Jack trek back to the beach camp. They stop for the night, and Jack explains to Kate the deal he made with Ben. He kept his head down and didn't ask questions. Though Jack is talking to her, Kate feels an emotional distance between them. Sayid grills Juliet for answers, but Jack returns and tells Sayid to leave her alone. She is under his protection. Juliet confesses to Jack that she's nervous about joining the beach camp.

Flashback to Juliet arriving at a private airport. Richard Alpert and Ethan Rom are there to escort her the rest of the way. It's a security thing. Juliet says good bye to her sister, Rachel, promising to be back before the baby's born. In the airport terminal, Ethan checks Juliet's vitals, telling her it's routine. Alpert pours sedative into a glass of orange juice and gives it to Juliet to drink, saying some people can't take the trip's intensity. It's easier if they're asleep. Juliet says she was fine with signing all the paperwork, not being able to talk with anyone for six months, and that no one had ever heard of Mittelos BioSience, but... Alpert interrupts and tells her she was fine with it because she knows the place they're taking her is special. Juliet has a gift, and isn't she supposed to do something significant with it? Juliet drinks the orange juice and passes out. She wakes up strapped down in the sleeping compartment of a submarine! Ethan unstraps her, and she follows him through the submarine, up the ladder and sees the awe inspiring sight of the island.

At the beach camp, Charlie hears Aaron crying and wakes up Claire. Claire says she's not feeling well, so Charlie offers to take care of Aaron. Sawyer sees Jack, Kate, and Sayid returning. It's a joyous reunion and then he sees Juliet. Sawyer is not pleased. Hurley engages Juliet in casual conversation. Juliet guesses that Hurley was sent to keep an eye on her. He tells her the last Other who came over, Ethan, was killed and buried nearby. Um, wow, was that a threat from Hurley?

Flashback to Juliet talking to Ben. She tells him she thinks the pregnancy complications happen at conception but there's nothing she can do about it unless she takes a woman off the island. Ben says no. Juliet tells him she's done all she can and wants to go home. Rachel will give birth in three months. Ben says she won't. Rachel's cancer is back and she'll be dead before then. Juliet is horrified. Ben promises to cure Rachel's cancer if Juliet stays. Juliet wants to know how. Ben says Jacob will take care of it himself.

At the camp, Jack tells everyone that he trusts Juliet and that should be enough. Sayid reminds him it's not. Jack defends his time with the Others saying he was there looking for a way off the island. Then Claire collapses. Juliet takes Jack and Kate aside and tells them she knows what's wrong with Claire because she did it to her.

Flashback to Juliet in bed with Goodwin. There's a knock on the door and she is given x rays. Juliet looks at them and knows they have a problem. She walks to Ben's house and tells him he has a tumor. She accuses him of lying about curing Rachel's cancer. How can he if he has cancer himself? Ben denies lying and says he doesn't understand why he has cancer. Juliet wants go home, but he refuses to let her go.

At the camp, Juliet explains that Claire's immune system has turned on her due to a latent reaction to medication in her bloodstream. The medication was designed to keep Claire alive during the late stages of her pregnancy. Juliet knows because she designed it. She was brought to the island to solve why women here couldn't have children. The mother's body treats the pregnancy as a foreign invader and the immune system attacks. Every pregnant woman on the island died. Claire was the first to survive. Even though she didn't conceive on the island, Claire developed the same symptoms. Juliet developed the serum to reverse what was happening, and Ethan was giving it to her. Without the serum, Claire is in a form of withdrawal. Ethan kept a stash of the serum close by.

Juliet goes out into the jungle and retrieves the serum. Sayid and Sawyer have followed, and they want answers. Juliet tells them there isn't time. Realizing they aren't going to budge, she stands up to them and says she finds it interesting that they are the camp's moral police. Did Sayid tell everyone what he did in Basra? And did Sawyer gather everyone into a circle and explain how he shot a man in cold blood? She says the serum can save Claire's life. The last thing they would want is Claire's blood on their hands. She takes the serum back to the beach and gives it to Jack. He warns her that if anything happens to Claire, he won't be able to protect her.

Flashback to Juliet and Ben as they watch flight 815 break apart above them. Ben then leads Juliet out to the Flame station. Mikhail is there, and Ben tells him he wants detailed files on every passenger. Then Mikhail brings up a live video feed. They see a close up of a newspaper with the current date. The camera swings around and reveals Rachel in a park with her newborn son. Ben tells Juliet that Rachel's cancer was cured. It went into complete remission and shortly thereafter that she gave birth. The boy's name is Julian.

At the camp, Claire wakes up. She's feeling and looking better. Juliet is now trusted. Jack brings her supplies to set up her tent area and tells her eventually everyone will need answers. Juliet asks why Jack trusts her and doesn't ask for answers. He says because when the sub exploded, he saw in her eyes that she wanted to get off this island more than anything. That makes her "one of us."

Flashback to Juliet and Ben going over their plans. Juliet will handcuff herself to Kate and say she was gassed and left behind, too. If Kate questions that, Juliet will say it was the only way to earn Kate's trust. Ben tells Juliet that Claire's implant has been activated, and she'll symptomatic in forty eight hours. By the time Juliet gets to the camp, she'll have a nice crisis to solve. Pryce is already on his way to hide the case in Ethan's old drop point. Ben tells her to tell Jack she can save Claire. Jack trusts her. He says he'll see her in a week.

And back at camp, as Juliet looks around and sees Hurley and Sun talking, Charlie with Claire, and Jack smiling at her, she smiles back and we realize the whole thing was a set up. What is Juliet up to?