Season 1

1.01 Pilot, Part 1
The Pilot episode of
Lost is so familiar, so iconic, it’s hard to look at it with new eyes. It’s a foundational hour, setting the board so to speak, and first hinting at just how fascinating and deeply mysterious all of Lost’s characters — including the island itself — would turn out to be.

1.02 Pilot, Part 2
Where Part 1 of the Pilot was very action-packed, setting up much of the show’s overall premise (the island, the crash, the smoke monster), Part 2 was very much a character piece. Every member of the show’s sprawling cast got a moment in the spotlight, and all of them were mysteries to be unraveled…

1.03 Tabula Rasa
Kate Austen gets the spotlight treatment in “Tabula Rasa,” but storylines are advanced for Sawyer, Michael & Walt, and others. It’s a quintessential Season 1 episode, touching on every main character’s emotional arc.

1.04 Walkabout
John Locke takes center stage in the classic, brilliantly-written and acted “Walkabout,” where we first learn about what makes the enigmatic “wilderness man” man tick.

1.05 White Rabbit
Jack’s de facto leadership of the survivors finally catches up with him in the form of exhaustion and images of his father on the island — which may or may not be hallucinations. Meanwhile, we learn what Jack was doing in Australia before the crash of Oceanic 815.

1.06 House of the Rising Sun
Sun’s past with her husband Jin is revealed when Jin viciously attacks Michael, leading the survivors to distrust him. Elsewhere, Jack and Kate make a surprising discovery in the caves.

1.07 The Moth
Charlie is forced to deal with the consequences of his heroin withdrawal, while Sayid’s attempt to locate the French woman’s transmission meets with a surprising result.

1.08 Confidence Man
Sawyer’s past is revealed when he refuses to help locate Shannon’s missing asthma inhalers, prompting Sayid to propose a drastic course of action.

1.09 Solitary
While tracing the island’s shoreline, Sayid meets the French woman responsible for the recorded distress call, but her paranoia-laden story leads Sayid to question her sanity — at first. Elsewhere, Hurley works on a mysterious project.

1.10 Raised by Another
Claire begins having nightmares as her due date approaches and believes she was attacked in the night. When Sayid returns with dire news and Hurley discovers equally alarming information, the fate of Claire and her baby are placed in jeopardy.

1.11 All the Best Cowboys Have Daddy Issues
Jack relentlessly pursues Ethan, who’s kidnapped Claire and Charlie. Flashbacks dealing with a troubled surgery reveal why Jack and his father Christian were at odds right before Christian’s death.

1.12 Whatever the Case May Be
When Kate and Sawyer find a metal briefcase from the plane, Kate goes to great lengths to open it. Elsewhere, the survivors on the beach are forced to relocate, and a very distraught Charlie receives help from someone else who’s missing a loved one.

1.13 Hearts and Minds
Boone is put through a grueling test by Locke when he threatens to tell Shannon about their project in the jungle. Elsewhere, Hurley bonds with Jin while trying to learn to catch fish.

1.14 Special
While Charlie wrestles with the prospect of reading Claire’s diary, Michael engages in a battle of wills against his son Walt, ultimately leading to both of them falling into mortal danger.

1.15 Homecoming
Claire returns to the survivors seemingly having escaped from her captivity, but Ethan returns as well, with a warning: give Claire back, or he’ll kill one of the Oceanic survivors per day until they do.

1.16 Outlaws
Sawyer battles against personal demons when a boar repeatedly attacks him. Charlie deals with the consequences of his actions against Ethan Rom.

1.17 …In Translation
Jin comes under suspicion when Michael’s nearly-completed raft is destroyed by a fire, leading Sun and Jin to a turning point in their relationship. Shannon also reaches a turning point in her budding romance with Sayid.

1.18 Numbers
Hurley decides to track down the French woman, Danielle Rousseau, after he sees something alarmingly familiar on one of the papers Sayid stole from her. Locke asks for Claire’s help in building a mysterious item.

1.19 Deus Ex Machina
Locke’s troubled history with his father is revealed when he believes the island is leading him and Boone to search the jungle for another downed aircraft. Elsewhere, a bemused Jack diagnoses the source of Sawyer’s recent headaches.

1.20 Do No Harm
While Jack tries to save Boone’s life, Claire goes into labor.

1.21 The Greater Good
Sayid takes it upon himself to ascertain the truth from Locke about what really happened to Boone, while Shannon vows revenge on the person she holds responsible for Boone’s death.

1.22 Born to Run
With the raft nearly ready to depart and rescue suddenly a possibility, Kate makes a play for Sawyer’s spot on the raft. Locke and Sayid show Jack the Hatch.

1.23 Exodus, Part 1
As the first season finale begins, Danielle Rousseau brings a warning to the survivors: the Others are coming. Jack and Locke come up with a plan to hide everyone from these mysterious island inhabitants, but it means a dangerous trek into the island’s Dark Territory. Meanwhile, the raft is finally completed and departs from the island.

1.24 Exodus, Part 2
The survivors head for the caves to try and hide from the Others, while a disaster strikes at the Black Rock, and Claire suffers a devastating blow.

1.25 Exodus, Part 3
Sayid and Charlie pursue Danielle and the kidnapped baby across the island, the survivors on the raft make contact with another ship at sea, and Jack, Kate, Locke, and Hurley encounter the monster again before finally blowing open the Hatch.

Season 2

2.01 Man of Science, Man of Faith
Jack, Kate, and Locke descend into the Hatch to find out what’s there, but what they find is nothing like what they expected.

2.02 Adrift
The fates of Michael, Sawyer, and Jin are revealed after the destruction of the raft. At the Hatch, Locke and Kate meet Desmond before Jack’s arrival.

2.03 Orientation
The origins of the Hatch are revealed, leading to an unexpected transfer of power. Elsewhere on the island, Michael, Sawyer, and Jin are taken captive.

2.04 Everybody Hates Hugo
Hurley finds himself with an unwanted job down in the Swan station and goes to extreme lengths to be rid of it. Meanwhile, Jack and Sayid try to discover the source of the station’s electromagnet, and Michael, Sawyer, and Jin learn more about the “tailies.”

2.05 …And Found
Sun searches for her lost wedding ring while Jin relentlessly pursues Michael, who’s fled the tailies in the hopes of finding the Others and Walt.

2.06 Abandoned
Walt appears again to Shannon, so she sets out to find him and convince Sayid that what she saw was real. The tailies and their new friends struggle to get a quickly-fading Sawyer to the beach camp, but their attempt to steer clear of the Others ends in tragedy.

2.07 The Other 48 Days
The story of the tailies is revealed in a series of highlights from their first 48 days on the island.

2.08 Collision
After her accidental killing of one of the castaways, Ana-Lucia goes to extremes to ensure her survival on the island. Elsewhere, Eko meets Locke and discovers the Swan station, and several long-awaited reunions take place.

2.09 What Kate Did
The reason Kate is a wanted fugitive is finally revealed as she watches over an ailing Sawyer inside the Swan station. Eko presents Locke with an unexpected gift, and Michael’s attempt to learn more about the Swan’s computer system leads to a surprising turn of events.

2.10 The 23rd Psalm
When Eko learns of Charlie’s secret Virgin Mary statue, he demands to be taken to the beechcraft the statue came from, leading to shocking revelations about Eko’s past. At the Swan station, Michael begins to formulate a secret plan.

2.11 The Hunting Party
Michael leaves again to go after Walt alone, and Jack, Locke, and Sawyer follow, intent on stopping him. But their journey ultimately brings them face-to-face with the Others for the first time, who deliver an ultimatum — with Kate’s life as their bargaining chip.

2.12 Fire + Water
After a series of strange dreams, Charlie becomes convinced that Aaron is in need of saving. But after recent events, no one will believe him — especially Claire. Meanwhile, Hurley and Libby grow closer.

2.13 The Long Con
When Sun is attacked in the jungle, Jack is ready to believe that the Others are back, despite their promise to leave the survivors alone. But something else is afoot, and Sawyer is right at the heart of it.

2.14 One of Them
Danielle leads Sayid to a strange man she’s captured in the jungle, claiming that he’s one of the Others, and Sayid takes it upon himself to ascertain the truth about the man — at any cost.

2.15 Maternity Leave
After Aaron becomes sick, Claire’s desperation leads her to remember everything that happened to her during her abduction and captivity by Ethan Rom.

2.16 The Whole Truth
When Sun discovers she’s pregnant, she wrestles with a secret she’s kept hidden from Jin for years. The power struggle between Jack and Locke heats up when Locke asks Ana-Lucia to interrogate Henry Gale.

2.17 Lockdown
Locke finds himself trapped in the Swan station with Henry Gale, and witnesses an astonishing sight. Meanwhile, Ana-Lucia, Sayid, and Charlie discover Henry’s hot-air balloon, and with it, the answers they seek.

2.18 Dave
Hurley believes the island is messing with his head when he sees a figure from his past materialize on the island. “Henry” shakes Locke’s faith with a surprising revelation.

2.19 S.O.S.
Rose is displeased when Bernard concocts a plan to get the survivors rescued. Jack devises a plan of his own — to trade “Henry” to the Others for Walt.

2.20 Two for the Road
After “Henry” tries to kill her, Ana-Lucia struggles with a desire for revenge. Meanwhile, Michael reports his findings about the Others to the survivors, and instigates a plot to attack them.

2.21 ?
While Jack tends to a gravely wounded survivor, Eko and Locke share surreal dreams that lead them to the site of the large question mark from the blast door map.

2.22 Three Minutes
While the survivors mourn their dead and make plans to rescue Walt from the Others, Michael’s secrets from his time in captivity are revealed.

2.23 Live Together, Die Alone, Part 1
When Desmond Hume returns to the island, Jack and Sayid sense an opportunity to turn the table on the Others. Locke, meanwhile, enlists Desmond’s help in taking control of the Swan station back from Eko, so they can determine if the countdown “protocol” is real or not.

2.23 Live Together, Die Alone, Part 2
Desmond becomes convinced that Locke’s plan will bring devastating consequences, while Jack, Kate, Sawyer, and Hurley come face-to-face with the leader of the Others.

Season 3

3.01 A Tale of Two Cities
The Others’ society is revealed as Jack, Kate, and Sawyer find themselves in captivity among them.

3.02 The Glass Ballerina
Sun, Jin, and Sayid set a trap for the Others when Jack’s team doesn’t show up as planned. Meanwhile, Sawyer and Kate are forced to work on a manual labor project for the Others, and Ben attempts to make a deal with Jack.

3.03 Further Instructions
Having survived the destruction of the Swan station, Locke is directed to rescue a fallen comrade when he attempts to reestablish communion with the island. Desmond emerges from the Swan’s destruction a changed man.

3.04 Every Man for Himself
Ben plays mind games on his three captives, focusing his efforts on Sawyer after Sawyer refuses to stop trying to escape. Jack is called on by Juliet to help in an emergency, and back at camp, Desmond constructs a mysterious device.

3.05 The Cost of Living
Eko treks to the beechcraft when his dead brother Yemi appears to him and tells him it’s time to be judged. Locke comes up with an idea that might help the survivors locate Jack, Kate, and Sawyer.

3.06 I Do
When Jack refuses to operate on Ben, Kate is told that Sawyer will die unless Jack changes his mind. On the main island, Locke and Sayid debate the cause of Eko’s death.

3.07 Not in Portland
Juliet plays a dangerous game of cat & mouse with both Jack and Ben while Kate and Sawyer receive unexpected help in their attempt to escape captivity.

3.08 Flashes Before Your Eyes
The mystery of what happened to Desmond when he turned failsafe key is revealed, allowing Desmond to make a shocking prediction about Charlie.

3.09 Stranger in a Strange Land
When Juliet faces dire consequences for her recent actions, Jack attempts to bargain for her life.

3.10 Tricia Tanaka is Dead
Hurley makes a discovery in the jungle that sparks a new plan to bring the survivors some hope. Sawyer and Kate finally make it back to the survivors at base camp.

3.11 Enter 77
Sayid, Locke, and Kate find a new Dharma station that houses a mysterious man claiming to be the last living member of the Dharma Initiative.

3.12 Par Avion
Claire devises a plan to use migratory birds to get everyone rescued, but Desmond and Charlie earn her ire by sabotaging her efforts. Sayid, Locke, Kate, and Danielle are shocked at what they find when they reach the place where the Others live.

3.13 The Man from Tallahassee
Kate, Locke, and Sayid invade the Barracks in an attempt to rescue Jack, only to find that he’s not interested in being rescued. But when Kate and Sayid are captured, Locke diverts from the plan and goes rogue on a solo mission of his own.

3.14 Exposé
When Nikki & Paulo turn up dead under unusual circumstances, the remaining survivors must determine how and why they died. A long-buried secret comes out between Sawyer, Charlie, and Sun.

3.15 Left Behind
When the Others pack up and leave the Barracks, Kate is knocked out, only to wake up in the jungle handcuffed to Juliet. Back at the beach, Hurley tries to convince Sawyer that it’s in his best interests to change his deceitful ways.

3.16 One of Us
Juliet seeks acceptance among the Oceanic survivors, but receives only suspicion and dangerous accusations.

3.17 Catch-22
Desmond has a new vision of Charlie’s impending death, but if he saves Charlie this time, he runs the risk of altering the second part of that same vision: the arrival on the island of a potential rescuer.

3.18 D.O.C.
Sun asks for Juliet’s help in determining whether Jin really is the father of her child. Desmond and Charlie clash when the woman they rescued in the jungle receives help from a very unlikely source.

3.19 The Brig
Locke returns to the beach camp to recruit Sawyer for a mysterious mission that only he can fulfill.

3.20 The Man Behind the Curtain
Locke returns to the Others and demands Ben take him to see Jacob, but when Ben finally relents and agrees, their visit with Jacob leads to disastrous consequences. Back at camp, the survivors finally confront Jack about Juliet’s treachery.

3.21 Greatest Hits
Charlie says goodbye to his closest friends after Desmond reveals his latest vision of Charlie’s death comes with a happy ending for everyone else. Jack explains his dangerous plan to defend the survivors from an impending attack by the Others.

3.22 Through the Looking Glass, Part 1
Jack enacts his daring plan to defend the camp against the Others, turn off the jamming equipment in the Looking Glass, and contact the freighter, in a bid to finally get the survivors rescued.

3.23 Through the Looking Glass, Part 2
Jack engages in a battle of wills against Ben with potentially dire consequences, while Charlie faces his destiny.

Season 4

4.01 The Beginning of the End
As the survivors prepare for the arrival of the freighter, Hurley joins forces with Locke to convince everyone that the freighter isn’t there to rescue them.

4.02 Confirmed Dead
The freighter sends four very unique individuals to the island, but the survivors quickly discover that rescue isn’t their reason for coming.

4.03 The Economist
The fourth member of the Oceanic 6 is revealed when Sayid strikes a bargain with Frank to visit the freighter, but to accomplish this, he’ll need to reach out to a distrustful Locke.

4.04 Eggtown
Kate tries to get some important information out of Miles, but earns Locke’s wrath in the process. In the off-island future, Kate faces a high-profile trial for her crimes.

4.05 The Constant
Desmond becomes unstuck in time while traveling to the freighter, and there’s only one person in the world who can anchor him before he is lost forever: Penny.

4.06 The Other Woman
When Daniel and Charlotte disappear from camp, Juliet receives an ominous request from Ben. Meanwhile, Locke learns who sent the freighter to the island.

4.07 Ji Yeon
Sun decides to move to the Barracks, an action that Juliet believes is such a mistake, that she goes to shocking lengths to keep her from leaving the beach. On the freighter, Sayid and Desmond finally meet the ship’s captain — as well as Ben’s spy.

4.08 Meet Kevin Johnson
Michael’s post-island fate is revealed, along with an explanation of how and why he joined the crew of the freighter.

4.09 The Shape of Things to Come
Keamy and his men attack the Barracks and demand that Ben turn himself over, and the results of their standoff change Ben’s world forever.

4.10 Something Nice Back Home
Jack needs an emergency appendectomy, and Juliet is forced to perform it. In the jungle, Miles notices something odd about Claire just before she sees a startling sight.

4.11 Cabin Fever
Locke’s destiny comes into focus as he, Ben, and Hurley finally reach Jacob’s cabin. Back on the freighter, Keamy activates the “secondary protocol,” a deadly backup plan for capturing Ben.

4.12 There’s No Place Like Home, Part 1
The Oceanic 6 come closer to their destined escape from the island as the inevitable confrontation builds between Keamy and Ben.

4.13 There’s No Place Like Home, Part 2
Locke makes a last ditch effort to keep Jack from leaving the island. Later, he learns the true purpose of the Orchid station. Ben receives help from some old friends. Michael hatches a daring plan to stall the C4 explosion on the freighter, while most of the Oceanic 6 are on their way there.

4.14 There’s No Place Like Home, Part 3
All of the events of Season 4 come to a head as a tragedy occurs on the freighter, the island is moved, and the Oceanic 6 escape from the island.

Season 5

5.01 Because You Left
The survivors left behind on the island start jumping through time at random, endangering their lives. Meanwhile, Locke gets some dire instructions from a higher power, and each member of the Oceanic 6 encounters complications that jolt them out of their everyday lives.

5.02 The Lie
Hurley struggles with keeping the Oceanic 6’s secret, while Ben’s attempts to get the Oceanic 6 back to the island hit a snag. On the island, the time-jumping survivors come under attack.

5.03 Jughead
Desmond travels to Oxford to find a woman who may be able to help the survivors trapped on the island stop jumping through time. Meanwhile, the survivors encounter the 1954 versions of some very familiar faces.

5.04 The Little Prince
Kate makes plans to confront the person trying to take Aaron from her, while the survivors on the island consider the consequences of changing history as they continue traveling through time.

5.05 This Place Is Death
Jin witnesses some important events in island history. Locke takes the final step on his quest to leave the island. Charlotte confides a startling secret to Daniel. And Sun prepares to kill Ben.

5.06 316
Jack learns how to return to the island, but it involves exercising the one thing he’s never been good at: faith.

5.07 The Life and Death of Jeremy Bentham
Locke’s fateful mission off the island to recruit the Oceanic 6 into returning is revealed, along with the circumstances surrounding his death.

5.08 LaFleur
After their final time flash strands them in the ’70s, Sawyer takes charge and leads his friends into joining up with the Dharma Initiative.

5.09 Namaste
Sawyer must act fast to bring Jack, Kate, and Hurley into the Dharma Initiative. In the present, the fate of Ajira 316 is revealed.

5.10 He’s Our You
Sayid’s life is on the line as the Dharma Initiative goes to great lengths to get the truth out of him.

5.11 Whatever Happened, Happened
Kate goes to great lengths to save young Ben’s life, while Jack infuriates everyone by refusing to do anything to help.

5.12 Dead is Dead
Ben sets off with Locke to fulfill the reason he came back to the island, but along the way he learns just how much Locke has changed.

5.13 Some Like it Hoth
Miles gets caught in the middle of Dharma Initiative secrets, which bring him face to face with demons from his own past.

5.14 The Variable
Daniel returns to the island with an urgent, daring plan to get all of the castaways back to where they belong — a plan that divides the survivors.

5.15 Follow the Leader
Locke finally takes up his mantle as leader of the Others, and in doing so reveals a startling plan. In 1977, the survivors try to escape from the Dharma Initiative, but Jack becomes convinced that changing history is what they were brought back here to do.

5.16 The Incident, Part 1
Jacob is revealed as Locke tries to manipulate Ben, while Sawyer, Kate, and Juliet try to stop Jack from detonating the bomb.

5.17 The Incident, Part 2
Locke and Ben finally meet face-to-face with Jacob, while Jack receives unexpected help in his attempt to change history.

Season 6

6.01/6.02 LA X
The aftermath of the detonation of the hydrogen bomb is revealed.

6.03 What Kate Does
Kate volunteers to track down Sawyer, while Jack is asked to do something that could kill one of his friends.

6.04 The Substitute
The Man in Black begins recruiting followers to his cause.

6.05 Lighthouse
While an unexpected revelation about Jack’s life in the sideways reality is revealed, his quest to find his purpose on the island takes a big step forward.

6.06 Sundown
Sayid sets out on a search for answers, but the answers he finds lead him to a shockingly drastic decision.

6.07 Dr. Linus
Ilana sentences Ben to death when the truth about his role in Jacob’s murder comes to light. Meanwhile, Richard takes Jack and Hurley on a trip down memory lane.

6.08 Recon
Sawyer is sent on a mission that’s vital to the Man in Black’s plans. The growing discord between Kate and Claire comes to a head.

6.09 Ab Aeterno
Bitter over the death of Jacob, Richard contemplates switching sides, and his backstory is finally revealed.

6.10 The Package
Jin is abducted by Widmore while the Man in Black attempts to recruit Sun.

6.11 Happily Ever After
Desmond is subjected to a dangerous procedure after he wakes up and finds that Charles Widmore has brought him back to the island.

6.12 Everybody Loves Hugo
After a member of Team Jacob is lost, Hurley tries to protect his friends from the mounting dangers facing them, putting him in opposition to Richard’s plan to blow up the Ajira airplane.

6.13 The Last Recruit
Jack comes face-to-face with the Man in Black, as MiB tries to sell Jack on his plan to escape the island. Widmore’s people up the stakes, forcing everyone to make their decision on whether to leave the island, or stay.

6.14 The Candidate
When the Man in Black convinces Jack to help him free the others, the full extent of his plan finally comes to light and multiple survivors pay the ultimate price.

6.15 Across the Sea
The origins and motivations of Jacob and the Man in Black are revealed.

6.16 What They Died For
The castaways face their destiny when their search for Desmond leads them to a long-awaited meeting. The Man in Black devises an endgame and recruits an old friend to help make it happen.

6.17/6.18 The End
Jack and the Man in Black face off for the main event, while Desmond undertakes the failsafe mission he was brought to the island for. In the Sideways world, Desmond puts his endgame into action, reuniting lost lovers from their former lives, and proposing a significant trip to everyone he wakes up.