After Faraday’s death, Jack convinced the others to bring him to the bomb and execute Faraday’s plan.
He believes that detonating the bomb will cancel everything and the flight that lead them to the island would have never happened.
Kate does not want to take the risk to blow up the island and tries to convince him that the risk is too high and if he’s wrong everybody would die.
Locke is now the leader of the others and want to meet Jacob. He asks Alpert to lead him to Jacob.
Sawyer got caught and is now under investigation because of the camera video that displays him bringing Ben to the others.
Michael’s whereabouts during his 13 days in captivity in the “Others” camp are detailed while in the present, he tries to convince Jack to help him mount a search party for his son Walt still being held captive. Meanwhile, Locke struggles with a choice whether or not to abandon the hatch.
Mr. Eko enlists Locke to help find a secret location he believes houses answers to the island’s mysteries. Meanwhile, Jack, Sawyer, and Kate struggle to cope with the horrific situation in the hatch following the escape of “Other” Henry Gale, and of the shooting deaths of Ana-Lucia and Libby, unaware that it was Michael who is responsible.
Hurley begins to think the island is affecting him in a very strange way, so Libby attempts to offer him support. Hurley also recalls his past in a mental hospital with his friend Dave. Meanwhile, the prisoner calling himself Henry Gale offers new information about the Hatch, which severely shakes Locke’s sense of purpose.
When the hatch suddenly takes on a life of its own, Locke is trapped alone in the bunker and is forced to enlist the help of an unlikely ally: the captive Henry Gale to try to free him. Meanwhile, Jack faces off against Sawyer in a series of card games for supplies. Also, Ana Lucia, Sayid and Charlie find out the truth about Henry in the jungle.
When Sun comes to the realization that she might be pregnant, she struggles on whether to tell Jin about the situation. After no success from Jack or Sayid, Ana-Lucia is called in by Locke to interrogate the prisoner, Henry Gale, to get more information out of him about how he arrived on the island. Ana-Lucia, Sayid, and Charlie then set out into the jungle to try and confirm Henry’s story.
When Charlie’s vividly surreal dreams lead him to believe Claire’s baby, Aaron, is in danger, Locke suspects Charlie may be using drugs again. More of Charlie’s background story shows his difficult relationship with his heroin addicted brother. Meanwhile, Sawyer encourages Hurley to act on his attraction to Libby.
Kate’s original crime that started her life on the run is revealed. Meanwhile, the survivors lay one of their own to rest, Kate sleeplessly watches over a feverish Sawyer, and Mr. Eko has a surprise for Locke regarding the hatch.
Sawyer’s wound becomes life-threatening as he, Michael and Jin make their way through the interior of the island with the tail section survivors, Ana-Lucia, Mr. Eko, Bernard, Libby, and flight attendant Cindy. Meanwhile, Shannon is once again haunted by visions of Walt, but she cannot convince a skeptic Sayid that her visions are real. More of Shannon’s background story shows her difficult relationship with her late half-brother Boone and further detailing how her step-mother financially cut her off after the death of their father. Also, Charlie becomes jealous of Locke’s interest in Claire, while Locke learns that Charlie took a heroin stuffed porcelain statue from the Beechwood plane wreck.
Michael is drowning and Sawyer saves him, while Jin is missing. Michael recalls his fight against Susan for Walt in the justice and the reasons for Michael’s desperate obsession for his son. They drift on a wreckage of the raft, with the menace of a shark. Michael blames Sawyer for the abduction of Walt and promises to bring his son back. Meanwhile, Kate releases herself from Desmond’s captivity and escapes through a ventilation duct, while Locke tries asking Desmond questions about the underground facility they are in and about the use of the mysterious numbers. At the end, Michael and Sawyer reach the beach, and they see Jin escaping from “The Others”.
