Jack awoke in an outrigger with Sayid, there informing them that they are on Hydra Island. Sawyer, Hurley, Sun, Jin, Charlie, Claire, Kate, and Lapidus are taken to the cells, but Sawyer takes a gun from the guard behind him. Charles Widmore threatens to kill Kate because she is not a candidate unlike him, Hurley, and Jin or Sun. Sawyer relents, and they are all thrown into a cell. Charles Widmore said as the door closed "it's also good to see you again Mr Pace, it's been so long since we've last seen each other".
Charlie told him "I know, and I wish that I wasn't forced to see you again so soon".
Charles Widmore said "I thought that you would be more grateful that I brought you to the island. Look at what's happened since".
Charlie told him "Everything I'm grateful here for, was done by myself and the people in this cage. Not you".
Charles turned to Sawyer "you may not believe it but I'm doing this for your own good".
Sawyer responded, "you're right we don't believe it".
Charles Widmore wanted to know how quickly the fence would be active and when he heard that it would be an hour, he wanted it to be done quicker. Jack is told about mortar attack and how it's only them left. The monster wants to free Jack's people so they can all leave the island. Jack doesn't want to leave but the monster hopes that will change and needs him to get the others to trust him. Jack agrees to help to save his friends. In the cage Kate tries to comfort Sawyer by stating that Charles Widmore wouldn't have killed her. Sawyer tells her that her name was crossed out and she was reminded of what Claire said to her earlier and thought that her, Claire, and Charlie could be killed because they weren't needed. The power then goes out and the monster attacks, when the monster throws a guard towards the cage Kate attempts to grab the keys but can't and then Jack grabs them and frees them all. Jack states that he's with the monster and they all head towards the plane. Jack states that he's still not leaving and run into Sayid who is coming with them. The monster kills the guards by the plane and takes one of their watches before investigating the plane and finding explosives. They make it to the plane and see the monster who warns them about the plane being rigged to blow. The monster insists taking the submarine to get off the island and even though Hurley tries to stop them because he cannot leave the island, Sawyer agrees because he's saved their lives twice now. Sawyer whispers to Jack to make sure the monster doesn't get on and for him to get it in the water. They make it to the submarine and Sawyer orders for Hurley, Lapidus, Jin, and Sun to go with him while the rest follow behind about thirty seconds after. He then asks for Jack and the monster to have their backs, and they agree. All five enter and quickly commandeer the submarine. The rest of them all follow, and the monster gives Jack a backpack which Jack believes is his. The monster tries to get Jack to reconsider but he refuses because Locke wanted him to stay. Jack then pushes the monster into the water as Claire is the first to climb down and Kate is shot in the shoulder. She falls onto the dock and Charlie exclaims "bollocks" as he dives to the submarine hatch door to avoid the gun fire. Jack rushes to immediately help Kate and carries her while Sayid holds them off. The monster climbs onto the dock and starts shooting the guards.
Jack and Sayid go down into the submarine and Sawyer wants to know what happened and they tell him that she's been shot by Widmore's people. Sawyer asks who's left. Sayid answers "just Locke".
Sawyer remarks "great" and smiles. Sawyer goes to the top and smiles to see that his plan had worked.
Then the monster turns around and shouts "James".
Sawyer watches him run towards the submarine, but Sawyer mockingly shouts "bye". Sawyer then slams the hatch door shut and orders Lapidus to dive. The monster though is happy about them going and, on the submarine. Jack wants to know what he is doing but Sawyer tells him that they are leaving. Jack goes to help Kate, but Hurley cannot find the first-aid kit. Jack tells Jin to get him his bag and once Jin gives it to him, Jack sees that there is actually a bomb inside. Jin orders them to surface as Sayid checks out the bomb and thinks that if they pull the wires out then it should make it inert. Jack believes that they will be okay because the monster cannot kill them. That he needs them to kill each other. Sawyer doesn't listen and pulls the wires which stop for a moment before the timer accelerates. Sayid quickly tells them where Desmond is before taking the bomb and running as far away as he can from them. It detonates and the submarine starts to flood. Lapidus tries to make his escape but is knocked out by a door while everyone gets up in the now flooding room.
Sun is trapped and Jin goes to free her with Sawyer helping. Jack then orders "Hurley, Hurley. You got to take Kate out of here".
Hurley asks "what about everyone else".
Jack says "I'll take care of them". Jack then orders "Charlie, Claire over here".
Jack grabs two air tanks before giving one to Charlie and then Hurley says "I've got to go after Sayid".
Jack says "there is no more Sayid". He hands Hurley the other air tank and tells the four "listen to me take the tanks and buddy-breathe, and swim out where the blast hole is okay". Jack then tells Hurley "Hurley you can do this, okay".
Hurley says "okay".
Jack then says 'what about you two".
Charlie says "got it Jack".
Claire then says "see you soon, brother".
All of them leave and go to the blast hole while Jack goes to help Sawyer and Jin with Sun. They get the thing trapping Sun off, but she is still trapped by something else, and Sawyer then whacks his head on the ceiling and knocked out. Jack keeps Sawyer afloat as Jin tries to save Sun. Sun pleads with her husband to leave but he refuses and continues to try and save Sun. Jin then insists that Jack save Sawyer because he will save Sun. Jack goes quickly to grab a third tank and tries to give it to Jin because he will not need it. Jin rejects him and insists that he goes and saves Sawyer. Jack leaves and Jin continues to try and save Sun to no avail. Sun pleads with him to leave but he refuses because he will not leave her. Jin tells her that he loves her, and she responds that she loves him as well. They kiss and hold hands as the water rises, and they both drown together. All six make it to the beach and Sawyer quickly coughs up water. Kate wants to know about Jin and Sun but after Jacks informs them that they didn't make it. Kate, Hurley, Charlie, and Claire cry over the loss of them. Jack stands in the water and cries over the loss as the monster goes to finish what he started.
Jack patches Kate and Kate tells Jack about Ji Yeon and how Jin never got to meet her. Sawyer, Kate, Claire, Charlie, and Hurley watch the ocean and the pieces of the submarine that drift ashore when Jack insists that they need to go now. Jack tells them that they are going to get Desmond because the monster wants him, and they will need him. Ben, Richard, and Miles go to the Barracks and Miles senses Alex which Richard confirms because he buried her here after he left. They enter Ben's old house and the secret room. Ben opens the safe and Richard insists that they need to blow it to hell, so Ben takes it all. They hear noises outside and see Zoe and Charles Widmore. Charles send Zoe to the outrigger and Richard tells Charles Widmore that they are going to blow up the plan. Charles admits to seeing Jacob after the freighter exploded and that he told him everything he needed to know for this purpose. Zoe tells him that the monster is coming, and he tells her to return. Sawyer apologises to Jack for getting Sayid, Jin, and Sun killed but Jack insists that it wasn't Sawyer but the monster. Hurley then sees kid Jacob and kid Jacob demands the ashes but after Hurley doesn't give them immediately, he takes them and runs away. Hurley follows until he see adult Jacob and he tells them that his ashes are in the fire and once they are gone, he will never see him again. Jacob insists that he get his friends because they are close to the end. The monster notices the equipment in the outrigger as Charles Widmore and Zoe hide in Ben's secret room. Ben wants Charles walkies and after he gives them to Ben, Ben hands one to Miles in case he needs him. Richard goes to talk with the monster because all he wants is for Richard to join him. Richard and Ben leave with Richard being immediately thrown by the monster before the monster talks to Ben about the monster wanting him to kill people because once he leaves the island, Ben can have the island. The monster wants to know whose outrigger it is, and Ben confesses that it's Charles Widmore's who is hiding in his closet. Ben leads the monster to Charles Widmore and Zoe who he wants to talk to and after Charles Widmore tells Zoe not to talk, the monster slices Zoe's throat. The monster threatens Penny if Charles Widmore doesn't talk, and he relents telling him that Desmond was a measure of last resort. Charles Widmore will not speak in front of Ben but does whisper it to the monster but is immediately shot by Ben because he does not get to save his daughter. The monster isn't mad because Charle Widmore already said everything he needed to know, and they both left with Ben following the monster.
Hurley led everyone back and Jacob said "hello Kate, James, Charlie, Claire, Jack".
They could now all see Jacob and Kate wanted to know that Sayid, Jin, and Sun didn't die for nothing. Jacob agrees to tell them all what they died for and why each of them were chosen. Also, everything they needed to know about protecting the island because when the fire burns out, one of them will have to start protecting the island. Jacob admits to bringing them all here because he made a mistake, and it will cause the deaths of everyone. Jacob admits to being responsible for the monster and ever since then he's been trying to kill him. Jacob realised that he would figure it out one day and would need someone to replace him. Sawyer wants to know why he thought that he could mess with his life because he was doing fine before he came here. Jacob rejects this and tells them that none of them were and that they were flawed, that they were like him and looking for something they couldn't find out there. That they needed this place as much as it needed them.
Kate asked "why did you cross mine, Charlie's and Claire's name off your wall".
Jacob answers "because you became a mother".
Claire was about to mutter something but swallowed it before saying "is that why you crossed my name off as well".
Jacob answered "sort of, I crossed your name off the second you chose to keep Aaron. Before then you were a candidate like the rest of them".
Charlie asked "what was the reason my name was crossed off".
Jacob answered "the paradox, your death and return made you an unsuitable candidate". Jacob the says "it's just a line of chalk on a wall, you three still can take up the job if you want to but I'm assuming you don't".
Jack asks what the job is, and Jacob tells them that they have to protect the light on the island and that they have to protect it from the monster. Jack wants to know if they need to kill him to which Jacob replies that he hopes so. Hurley wants to know how he will choose, and Jacob tells them that they have a choice. Jack volunteers and Jacob takes Jack to the stream where the rest of them watch what they are doing. Jacob tells Jack where the heart of the island is and that is where the light is. Jacob get some water before muttering something and getting Jack to drink it. Jack drinks it and Jacob puts his hand on his shoulder saying that he is now like him. Ben and the monster go to the well but cannot find Desmond inside, the monster is happy that Sayid didn't kill Desmond because he was a failsafe in case, he managed to kill every other candidate. The monster then tells Ben that Desmond can help him destroy the island.
Jack tells them all that they have to go to the bamboo forest and the protect the light at the heart of the island. Sawyer suggested that they all go to heart of the island while he got Desmond. Jack, Kate, Claire, Hurley, and Charlie head to the heart of the island when Jack confesses that he took the job because he was supposed to and that the island was the only thing he had left. Sawyer sees the monster at the well but is stopped by Ben. Ben takes him to the monster and sees that Desmond isn't there. Sawyer informs them that they were no longer candidates before taking Ben's gun and running away. Ben then asks about the monster destroying the island and the monster answers that he lied about Ben being in charge but will allow him to come on his boat off the island. The monster than realises that nearby are dog tracks. Desmond awakes at Rose and Bernards cabin and is given a drink before Rose tells him to leave after breakfast because they are through with drama. The monster wants to take Desmond and Desmond agrees as long as Rose and Bernard aren't hurt. Miles tries to contact Ben but fails and checks on Richard, they decide since Miles still has the explosives that they need to continue their mission and blow up the plane. Sawyer makes his way back to the group and informs them about the monster having Desmond and his plan to destroy the island. On the dock Miles realises that Richard has a grey hair, and Richard realises that he is now ageing. They both head to Hydra Island where they see Lapidus floating weakly in the water. They pull him aboard and tell him their plan to destroy the plane. Lapidus suggests that instead of blowing it up, they use it to fly away, which Richard and Miles agree to. Jack's group run into the monster, Ben, and Desmond; Kate fires shots at the monster but it does nothing. The monster realises that Jack is the new protector and is here to stop him. Jack rejects this and is in fact going with him because what he thinks will happen wont, and he will kill him. Jack then leads them all to the heart of the island and the monster insists that only Jack and Desmond continue on. The three make it to the heart of the island and see the light inside, Jack ties a rope around Desmond and Desmond tells him about what he saw with him sitting next to him on Oceanic 815, but Jack doesn't believe him. Miles manages to contact Ben and inform him that they are at the plane, Ben pleads with to not blow it up, but Miles informs him that they aren't but flying it off. Jack and the monster lower Desmond down and Jack says that John Locke being right about almost everything. Desmond enter the pool and it's painful, but he makes his way to the rock and pulls it out. After he has the water stops and the light goes out, causing the island to start being destroyed. The monster claims that Jack was wrong as he leaves the cave but is immediately attacked by Jack, who sees the monster is bleeding and is mortal now. The monster knocks Jack out before fleeing to his boat. Ben, Hurley, Sawyer, Charlie, Claire, and Kate feel the shaking of the island being destroyed, and Ben saves Hurley from being crushed from a falling tree. Jack awakes and goes to get Desmond but can't hear him, so he goes after the monster. Everyone in the group tries to free Ben but realise that it's to heavy Miles contacts them and Kate answers, Miles wants to know what is happening.
Kate answers "the island's being destroyed".
Miles exclaims "great, good thing Lapidus is working on the plane right now, then were taking off".
Miles talks to Lapidus about the timetable to fly and he guesses it's about five maybe six hours with Richard informing him that he might have one. Miles tells the group to get their arses over there now. Ben informs him about the boat the monster has, and it can get them there in time. Jack makes it to the monster and calls out to him before fighting him. The monster manages to stab Jack in the stomach before getting the upper hand and cuts into his neck a little. Kate arrives and shoots the monster before Jack kicks him off the cliff and dies. The island is still being destroyed and Lapidus checks the electronics realising there is something wrong with the hydraulics. Miles and Richard go to fix it as Ben contacts Lapidus and wants to know how it's going but he doesn't want to be bothered. Jack needs to fix whatever Desmond did and Kate pleads with him to not to and just let it sink but he is adamant that he needs to save the island. Jack asks Sawyer if he can get the boat across the channel in time which Sawyer says he can do. Ben gives him a walkie because he's not leaving the island, and Hurley agrees to stay with Jack. Jack says "Kate, you gotta go, get Claire and Charlie on that plane".
Kate says "tell me I'm going to see you again".
Jack cant give her a confirmation and she realises that they their time together is over. They kiss before she tells him that she loves him, and he tells her that he loves her.
Jack then hugs Claire telling her "Look after my nephew okay, he needs you".
Claire replies "of course brother".
Jack then hugs Charlie telling him "You treat my sister right or I'll find my way to you and kick your arse".
Charlie responded "wouldn't dream of doing otherwise".
Jack smiled as he, Ben, and Hurley go back to the heart of the island. Miles and Richard repair the hydraulics and are about to check when Sawyer tells Richard that they are coming to them. All four go to the boat and jump into the sea before swimming to the boat and sailing to Hydra Island. Jack leads them back to the heart of the island and tells them that he has to go in there alone because he will not come out. Hurley reminds him that he has to protect the island, but Jack tells him that it's now Hurley job. Hurley accepts it on a temporary basis to which Jack agrees to. Jack gets a bottle from Oceanic 815 and gets some water. Jack then tells Hurley to drink it and when he does, Jack puts his hand on Hurley's shoulder and tells him that he is like him now. Lapidus checks the systems, and they work. Sawyer, Kate, Claire, and Charlie make it to Hydra Island and run to the plane as fast as they can which they see is turning around. They run onto the runway and Lapidus sees them before stopping take off to let them on. All four run to the plane and Richard and Miles let them on Claire climbs aboard first followed by Kate, Charlie and finally Sawyer. Lapidus tells them to buckle up as he begins take-off and Claire and Charlie sit to the left as Kate and Sawyer sit to the right. The plane rushes down the runaway and takes off with all of them happy to be finally leaving the island. Claire and Charlie hold hands as they look to the fading island, and she says, "we did it Charlie, we made it off". Sawyer looks out the window also happy to see the island fading his sight. Hurley and Ben lower Jack down and Jack sees that Desmond is alive and takes him back to the rope and ties it around him. Jack goes to the rock and inserts it back it. The water the rushes back in and the light turns back on. Ben and Hurley realise that he did it and begin to pull who they think is Jack up but is actually Desmond. They realise it's Desmond and as they get Desmond out, they realise that Jack is really gone and that protecting the island is Hurley's job now. Hurley claims that he doesn't know what to do but Ben tells him that he should do what he does best; take care of people and can start by getting Desmond home. Hurley questioned how because people can't leave the island, but Ben told him that was how Jacob ran things, but he could run it a better way. Hurley then asks for Ben's help to which he agrees. Jack awakes on some rocks and slowly into the bamboo forest bleeding out. He goes as far as he can before needing to lie down. Jack then sees Vincent run by and lay besides him as Jack watches Ajira 316 fly above taking his friends off the island for good. Jack smiles at this knowing that he saved them and closes his eyes for the final time.
