Season 4, Episodes 13 and 14:

There's No Place Like Home, Part 2

At the helicopter, Kate and Sayid help the Others ambush Keamy and his team and rescue Ben. Omar is killed by a loose grenade, while Keamy is shot in the back by Richard. The Others give the survivors the helicopter and allow them to leave the Island. They are joined by Jack, Sawyer and Hurley. While flying to the freighter, they discover that the helicopter is leaking fuel. Sawyer whispers something to Kate, and jumps out to reduce the weightload, swimming back to the Island.

At the Orchid, Jack and Sawyer find Hurley and Locke. Locke persuades Jack to lie about where he was when he leaves the Island. While Locke watches an orientation video discussing time travel experiments, Ben uncovers a secret chamber at the station, containing a frozen wheel in a wall. Keamy arrives, having survived his shooting, and says that the bomb on the freighter will go off if he is killed. Ben stabs him repeatedly and kills him. He tells Locke that once he moves the Island, he will be banished, and that Locke will be the new leader of the Others.

On the freighter, Michael uses liquid nitrogen to freeze the bomb's battery to prevent it from going off, though they only have a limited supply. Daniel continues to ferry passengers from the beach, though he is unable to convince Miles and Charlotte to leave. When the helicopter lands, Desmond, Sun and Aaron get on board, though Jin is too late, and is still on the freighter when it explodes. Michael stays behind, and is killed. When Ben turns the frozen wheel, the Island is engulfed in a white light, and then disappears. The helicopter crashes into the ocean, and the people on board are stranded in a liferaft. Penny arrives on a sailboat and rescues them. The Oceanic Six agree to lie about what happened, and say goodbye to Desmond, Penny and Lapidus, before taking a raft to a nearby inhabited island, where they are found by locals.

In flashforwards, just after Jack tells Kate they have to go back to the Island, she furiously confronts him. She tells him that "Jeremy Bentham", the man whose memorial Jack attended, was crazy, and that she's never going back. Walt visits Hurley at Santa Rosa, and says that Bentham came to see him. Sayid kills an assassin stationed outside Santa Rosa. He tells Hurley that Bentham is dead, and takes him somewhere safe. Sun meets Widmore, and tells him they have common interests. Kate has a nightmare in which Claire tells her never to bring Aaron back to the Island. Jack meets Ben at the funeral parlor. Ben tells him that the Island won't let him come back alone, and that he needs to bring all of his friends back too, including "Bentham", who is really John Locke.

Tropes in this episode include:

• All for Nothing:
  • All of Jack's increasingly desperate attempts to get the survivors rescued come to nothing when the freighter is blown up and the Island moves before he and the rest of the Oceanic Six can get back to it on the helicopter. Although they are rescued along with Lapidus and Desmond, it's clear Jack sees himself as a failure for leaving the rest behind.
  • Ben's decision to spare the crew of the freighter instead of having Michael kill them all before they got anywhere near the Island ends up being for nothing when he causes most of their deaths anyway by killing Keamy and setting off the bomb that he has rigged to explode when his heart stops beating. In the meantime, this decision has cost him his daughter's life and leadership of the Others and led to him being exiled from the Island.
• Artistic License – Physics: Keamy’s radio transmitter would not have been able to broadcast from that deep underground, so the bomb could not have received a detonate command. Even if the bomb was rigged to explode once the signal was lost, then it would have gone off as soon as Keamy went down to the Orchid, if not sooner.
• Big Damn Reunion: Desmond and Penny are finally reunited when her boat picks up the Oceanic Six while they are stranded in a lifeboat.
• Bittersweet Ending: Even with knowing how miserable everyone is going to be after leaving the Island, the return of the Oceanic Six to civilization is bittersweet. Jack fails to get everyone off the Island like he had promised, and he realizes that Locke was right and they now need to lie about everything that's happened since the crash in order to protect the ones who they left behind.
• Chekhov's Skill: Desmond's time in the military comes in handy in allowing him to explain how the bomb on the freighter works, and that attempting to disarm it is futile.
• Conveniently Timed Attack from Behind: Richard shoots Keamy is the back just as he is on the verge of killing Sayid.
• Dead Man's Switch: The bomb on the freighter is connected to a heart rate monitor worn by Keamy, meaning that it will explode if he is killed. Ben, fuelled by rage at Keamy's murder of Alex, kills him anyway, dooming everyone on the boat.
• Drowning My Sorrows: After swimming back to the island, Sawyer sees Juliet on the beach with a bottle of whiskey in her hands. He asks what she's celebrating. She replies that she's not celebrating, to which he turns around and sees a billow of smoke off-shore where the freighter was.
• Eiffel Tower Effect: Tower Bridge is prominently featured in the background when Sun meets Widmore in London.
• Emergency Cargo Dump: As the helicopter starts running out of fuel Lapidus yells for the passengers to throw out anything that isn't bolted down. When they're still too heavy Sawyer voluntarily jumps out to reduce the load.
• Enemy Mine: Kate and Sayid team up with the Others to take down Keamy and his team and rescue Ben. In exchange, the Others give them the helicopter and allow them to leave the Island.
• Failed a Spot Check: Ben chides Locke for not being able to find the Anthuriums, though Locke admits he doesn't know what they look like.
• Flat-Earth Atheist: Jack denies that the Island moved despite having seen it disappear right in front of him.
• Foreshadowing: The Orchid orientation video's discussion of Time Travel becomes very important in Season 5.
• Foregone Conclusion: Zig-Zagged for Sawyer, Jin, and Desmond, all of whom appear to be close to leaving the Island with the Oceanic 6.
  • While Sawyer is among the group that takes off in Frank's helicopter, the audience already knows he's not going to make it off the Island.
  • Sun believes that Jin is dead in the flashforwards, so it's clear he's not escaping the freighter.
  • Averted with Desmond, who wasn't on Flight 815 and thus doesn't count as a member of the survivors, so his fate could have gone either way. For a moment, it looks like he doesn't make it when the helicopter crash lands in the ocean, but he survives.
• Heroic Sacrifice:
  • A non-fatal version happens when Sawyer voluntarily jumps out of the helicopter to lighten the load so the other passengers can make it to the freighter.
  • Michael stays behind with the bomb on the freighter to freeze the battery and buy the others time to get off the boat.
• Immediate Sequel:
  • The flashforwards follow directly from Jack's conversation with Kate at the end of "Through The Looking Glass".
  • Ben's final scene, as he turns the frozen wheel to move the Island, is an Immediate prequel to his flashforwards in "The Shape of Things to Come".
• Karma Houdini Warranty: After killing Ana Lucia and Libby, and then escaping the Island with Walt, Michael finally pays for his actions when he is killed by the bomb.
• In the Back: Richard shoots Keamy twice in the back to get him to let go of Sayid. It eventually turns out it didn't kill Keamy, but at least Sayid was saved.
• Oh, Crap!: There is a chain of these as Jack's plan to escape the Island unravels.
  • Desmond has this reaction when he sees the helicopter coming in to land, while the bomb is rigged to explode.
  • Frank starts to freak out when the Island disappears and there's nothing but water in every direction.
  • Right as they're being rescued, Jack realizes that Locke was right and that they do need to lie about everything that's happened since the crash.
• Revenge Before Reason: Ben murders Keamy in revenge for Alex's death, despite knowing that doing so will detonate the bomb on board the freighter. He later admits that this was a poor decision, and his grief clouded his judgement.
  Locke: You just killed everybody on that boat.
  Ben: So?
• Shoot the Dog: Lapidus takes off in the helicopter with Jin still on the freighter, and refuses to go back for him when Sun tries to demand that he do so. This seems harsh, but is completely necessary, since everyone on the helicopter would have been killed if they had stayed on the boat for even a minute longer.
• There Is No Kill Like Overkill: Desmond notes that there's enough C4 set up to sink an aircraft carrier.
• Uncertain Doom: Jin. While Sun believes him to be dead in the flashforwards, he's on the freighter's main deck and near its edge when the bomb goes off.
• Wham Line: Miles implies that Charlotte has been to the Island before, surprising even Charlotte herself.
  Miles: I'm surprised you wanna leave.
  Charlotte: Sorry?
  Miles: It's just weird. You know, after all that time you spent trying to get back here.
  Charlotte: What do you mean, get back here?
• Wham Shot: Locke is the man in the coffin whose memorial Jack attended in the flashforwards.
• Wire Dilemma: Desmond quickly establishes that yanking any of the many wires on the C4 bomb will cause it to explode immediately. Michael's trick with the liquid nitrogen buys them a few minutes, but the bomb still explodes.
  Desmond: This is a trip wire. Move it, and... boom. This is dummy wiring. If you cut the wrong one... boom. This is multiple firing systems. You disable one, and the next one... boom. Uh, this... battery's the power source. If you disconnect it—
  Jin: Boom.