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Many of the characters have secrets.

How am I supposed to keep straight who knows what around here? I mean, Steve didn't even know about the polar bear!

Hurley, "Born to Run"

The characters on Lost had many secrets they kept from each other. In addition to the many unshared details of their respective backstories, new information was often slow to spread among characters because it was initially restricted to a small group. This fact is often referenced in the show itself, as characters complained about not belonging to the "in" group at various times. Some secrets listed below were eventually revealed over the course of Lost, while others have yet to be widely known. This page serves to keep track of all noteworthy unshared (or formerly unshared) character details, in order to keep tabs on who knows what.

Season 1[]

Charlie was a recovering heroin addict

Charlie was a recovering heroin addict
Summary: Charlie became addicted to heroin through the influence of his brother Liam. When his stash began to dwindle after a week on the Island, he came clean with the help of Locke, though he had several near-relapses. ("Pilot, Part 2")  ("The Moth")
Who knows: Liam, Locke, Jack, Hurley, Claire, Sawyer; Charlie and Eko prior to their deaths
2X12 - CharlieHoldingStatue

Kate is a fugitive and murderer

Kate was a fugitive and murderer
Summary: Kate killed Wayne, who she originally thought was her step-father, after she found out that he was her biological father in 2001. She was on the run from the law ever since. ("Pilot, Part 2")  ("Tabula Rasa")  ("What Kate Did")
Who knows: Everyone
2x09 kate edward

How Locke viewed "the Monster"

How Locke viewed "the Monster"
Summary: Like Eko, Locke supposedly had contact with "the Monster". What he saw has never been precisely shown. ("Walkabout")
Who knows: Locke; Jack to an extent; Eko prior to his death.
  • Locke told Jack that he looked into the eye of the island and "what I saw was beautiful". ("Walkabout")
  • Locke told Eko that he saw a white light, shortly before Eko's death. ("The Cost of Living")

Locke was once disabled

Locke was once disabled
Summary: Locke was in a wheelchair for four years before the crash. After the crash, he could walk. ("Pilot, Part 1")  ("Walkabout")
Who knows: Locke, Rose, the Others, Sawyer, Walt ; Boone, Anthony Cooper prior to their deaths
  • Walt said to Michael, "Mr. Locke said a miracle happened to him." How much Locke elaborated on this fact to Walt is unknown. ("Tabula Rasa")
  • Locke revealed his secret to Boone just before Boone was injured exploring the drug smugglers' plane. Boone died before telling anyone Locke's secret. ("Deus Ex Machina")  ("Do No Harm")
  • Locke wheeled up to Rose in the airport to pick up the medication she had dropped. Later, when he told her that it would take four weeks for him to recover from the blast door crushing his legs, she replied, "You and I both know it's not going take that long." ("S.O.S.")
  • Mikhail told Locke that "the John Locke I used to know was para-", but was interrupted by Rousseau. ("Par Avion")
  • Ben asked Locke about his sudden recovery from paralysis, and further revealed that he knew that Locke was paralyzed by his father knocking him out of a window. ("The Man from Tallahassee")
  • Anthony Cooper caused Locke's paralysis, and knew about it when he appeared on the Island. ("The Man from Tallahassee")  ("The Brig")
  • All of the Others were curious about the supposed miracle of Locke's recovery. ("The Brig")
  • Anthony Cooper told Sawyer while in the Black Rock. ("The Brig")
Locke in Wheelchair

Locke and Boone discover The Hatch

Locke and Boone discover the Hatch
Summary: Locke and Boone discover the Hatch, however Locke wants it kept a secret until they can find a way to open it. ("All the Best Cowboys Have Daddy Issues") ("Hearts and Minds")
Who knows: everyone
  • When Boone tires of lying to Shannon about what he and Locke are really doing in the jungle, Locke knocks Boone out, ties him up and drugs him. Boone has a vision in which Shannon dies which leads him to "let go" of his dependency on her and he keeps the secret. ("Hearts and Minds")
  • After failing to open the Hatch with a trebuchet, Locke has a vision of the Beechcraft and enlists Boone to find it, believing this will lead to a method to open the Hatch. Boone is critically injuried while in the airplane which Locke keeps a secret from Jack and the Losties. ("Deus Ex Machina")

Jin's father is alive

Jin's father is alive
Summary: Jin told Sun and Mr. Paik that his father was no longer alive. This was revealed to be a lie, caused by Jin's shame over his background. ("...In Translation")
Who knows: Jin, Sun
  • Sun discovered the truth after Jin's biological mother blackmailed Sun to keep her profession a secret. Sun found Jin's father and agreed to keep his secret after talking to him in person. ("D.O.C.")
Jin's father

Sun knows English

Sun knows English
Summary: In Sun's first days on the Island, no one—not even Jin—knew that she spoke English. However, everyone learned of her secret after a month on the island. Sun learned English from Jae Lee after having an affair with him prior to boarding Flight 815, as part of her plan to leave Jin. ("House of the Rising Sun")  ("The Whole Truth")
Who knows: Everyone
  • Sun revealed her secret first to Michael, to explain that Jin assaulted him for being in possession of Jin's watch. ("House of the Rising Sun")
  • Kate discovered Sun's secret based on her slight chuckle to Kate's joke while they were gardening. ("Hearts and Minds")
  • All of the survivors, including Jin, finally learned about her ability to speak English when she had to reveal it to defend Jin against accusations that he burned the first raft, since he could not comprehensibly defend himself. ("...In Translation")
1x06 sun michael

Sawyer is a murderer

Sawyer is a murderer
Summary: Sawyer killed Frank Duckett for revenge (mistaken person). ("Outlaws")
Who knows: Kate, Juliet, Sayid, Locke, the Others
  • Known by Kate that he killed a man (no details given), after a game of "I never". ("Outlaws")
  • Juliet told Sawyer that she knew in front of Sayid. ("One of Us")
  • Locke read the file that the Others had on Sawyer, which included the fact that Sawyer murdered a man. ("The Brig")

Jin was an "enforcer" for Mr. Paik

Jin was an "enforcer" for Mr. Paik
Summary: Jin was hired as an "enforcer" for Sun's father, Mr. Paik. ("...In Translation")
Who knows: Sun
  • Sun knew he worked for her father, and saw him with blood on his hands after a job. ("...In Translation")
1x17 paik

Hurley is a multimillionaire

Hurley is a multi-millionaire
Summary: Hurley won the Mega Lotto Jackpot by playing the Numbers he got from Leonard. ("Numbers")
Who knows: He discussed the topic with several people:

Walt Burned the First Raft

Walt Burned the First Raft
Summary: Walt burned down the first raft Michael, attempted to build. ("Pilot, Part 2")  ("Tabula Rasa")  ("What Kate Did")
Who knows: Michael and Locke
  • After the raft burned, everyone suspected Jin, however, Locke confronted Walt and his response was that he had been moving his whole life, and he didn't want to move anymore, he liked the island. ("...In Translation")
  • Locke assured Walt that he did not suspect him of poisoning his father, just because he knew about the first raft. ("Born to Run")
  • After Michael was poisoned, Walt confessed to his father that it was he who burned down the first raft. Michael told him they could stay if he wanted, but Walt declared that they "have to go". ("Born to Run")

Sawyer's real name

Sawyer's real name was James Ford
Summary: Sawyer's real name was James Ford. ("Exodus, Part 1")
Who knows: Everyone
Young sawyer

Sun poisoned Michael

Sun poisoned Michael
Summary: Michael got sick and Jack determined that someone poisoned his water bottle. Although Kate and Sawyer were early suspects, Sun was the one who did it, but it was Kate's idea. ("Born to Run")
Who knows: Jack, Kate
  • Jack confronted Sun, who confessed she didn't want Jin to leave, and "only used enough to make him sick." Michael inadvertently drank from Jin's water. Jack agreed to not tell anyone. ("Born to Run")
1x22 sun

Kate helped Sun's poison attempt

Kate helped Sun's poison attempt
Summary: Kate urged Sun to poison Jin. ("Born to Run")
Who knows: Sun
1x22 kate 4

Season 2[]

Ana Lucia committed murder

Ana Lucia committed murder
Summary: Ana Lucia murdered Jason McCormack for revenge, after he shot her and killed her unborn baby. ("Collision")
Who knows: Teresa Cortez, Sayid
  • Her mother, Teresa Cortez, guessed correctly that she murdered Jason. ("Collision")
  • She told the story about how she was shot to Sayid, but did not tell the ending when he asked what happened to the man. Sayid may have guessed her secret from her demeanor, because he said, "What good would it be to kill you, if we're both already dead?" when she handed him the gun and dared him to shoot her. ("Collision")

Eko's dark past

Eko's dark past
Summary: Mr. Eko used to be a feared drug dealer who was known for murders and threats in his homeland of Nigeria. Later he disguised himself, and lived as a priest. ("The 23rd Psalm")
Who knows: No one, but probing questions were asked in response to some of his unorthodox actions.
  • Charlie asked, "What kind of priest are you, anyway?" ("The 23rd Psalm")

Charlie attacked Sun

Charlie attacked Sun
Summary: As part of Sawyer's plan, Charlie attacked Sun, making it look like the Others were becoming more aggressive. Charlie participated in the plan to make Locke look like a fool. ("The Long Con")
Who knows: Sawyer, Sun
  • Charlie and Sawyer discussed the plan in the forest after it was accomplished. Sawyer promised never to reveal that Charlie was involved. ("The Long Con")
  • Charlie confessed and apologized to Sun. Sun told Sawyer that she wouldn't tell Jin. It is unknown if she or Charlie revealed it to anyone else. ("Exposé")

Jin was infertile

Jin is infertile
Summary: Sun and Jin were tested for infertility. The doctor confided privately to Sun that her husband was infertile. ("The Whole Truth")
Who knows: Everyone
  • After revealing to Jin she was pregnant, Sun also told him about Dr. Je-Guy Kim's revelation. ("The Whole Truth")
  • When Juliet found out that Sun was pregnant, Sun confessed that she had an affair and that Jin was infertile. Juliet included this bit of information on the recording she left for Ben. ("D.O.C.")
  • Sawyer played the tape for all of the survivors. ("The Man Behind the Curtain")

Sun had an affair

Sun had an affair
Summary: Sun had an affair with Jae Lee. ("The Whole Truth")
Who knows: Mr. Paik; Juliet and Jin knew that Sun had an affair but not with whom.
  • Her father, Mr. Paik, saw them in bed together. ("The Glass Ballerina")
  • Although Mr. Paik asked Jin to kill Jae Lee, Jin was unaware of the affair. ("The Glass Ballerina")
  • Sun told Juliet upon entering the Staff. ("D.O.C.")
  • Juliet told Jin about Sun's affair to try to get both of them to stay at the beach. ("Ji Yeon")

Rose was terminally ill

Rose was terminally ill
Summary: Rose had a terminal illness, which she believed to be cured because of the Island. ("S.O.S.")
Who knows: Bernard, Locke, Jin
  • Before the crash, Rose told Bernard she was sick, and later after the crash, she told Bernard that the island healed her. ("S.O.S.")
  • Rose told Locke that she was healed by the Island, just like he was. ("S.O.S.")
  • Bernard told Jin that Rose had cancer while fishing, although it it unknown how much of the conversation Jin understood. ("Ji Yeon")
2x19 rose 2

Libby already knew Hurley, and was at SRMHI

Libby already knew Hurley and was at SRMHI
Summary: Libby was in Santa Rosa Mental Health Institute with Hurley. ("Dave")
Who knows: No one but Libby, not even Hurley.
  • Hurley said, "Do I know you from somewhere?" to Libby, but he couldn't remember from where. ("Fire + Water")
  • Libby tried to misdirect him, by making up a story about his having stepped on her foot when he came on the plane. However, Hurley was the last person to board the plane, and Libby was already seated in the back section, so this was a lie. ("Dave")

Ana worked with Jack's father

Ana worked with Jack's father
Summary: Ana Lucia worked with Jacks father, Christian Shephard, on a trip to Australia. She did not know Christian was Jack's father. ("Two for the Road")
Who knows: No one, not even Ana Lucia understands the significance of her employer.
  • Christian hired Ana Lucia to accompany him on a trip to Australia.("Two for the Road")
  • Ana Lucia and Jack never drew their connection before Ana Lucia's death. It is possible that Ana Lucia did know, since she asked if his father was a drinker, but she chose not to tell Jack.

Libby gave Desmond the sailboat

Libby gave Desmond the sailboat
Summary: Libby met Desmond off the Island, and gave him the Elizabeth. ("Live Together, Die Alone, Part 1")
Who knows: No one, except for Desmond.
  • Desmond did not know the significance of Libby, as he disappeared before she arrived, and appeared right after her funeral.
Des l

Michael's betrayal

Michael's betrayal
Summary: Michael shot Ana Lucia and Libby to free Ben. He was coerced by the Others to free Ben and also to betray his friends by luring Kate, Jack, Sawyer, and Hurley to the Others camp. ("Live Together, Die Alone, Part 1"),
Who knows: Everyone
  • Sayid worked out Michael's plan and informed Jack. He then sailed around the island in an attempt to help. ("Three Minutes"), ("The Glass Ballerina")
  • After confronted by Jack, Michael admitted his guilt to the group. ("Live Together, Die Alone, Part 1")
  • Ben told Juliet that Michael could be manipulated in a way that would help them capture Jack, unaware that Paulo was eavesdropping. ("Exposé")
  • Michael apparently told Walt while escaping the island because he "had to tell someone". This caused Walt to become afraid of Michael, and start living with his grandmother in Manhattan. ("Meet Kevin Johnson")
2X23 MichaelJackSawyer

Desmond Crashed Oceanic Flight 815

Desmond Crashed Oceanic Flight 815
Summary: After killing Kelvin, Desmond failed to get back to the hatch in time to enter the numbers, causing a build-up in electromagnetic energy which brought down Oceanic Flight 815. ("Live Together, Die Alone, Part 2")
Who knows: Everyone
2X23 MichaelJackSawyer

Season 3[]

Jin was ordered to kill Jae Lee

Jin was ordered to kill Jae Lee
Summary: Mr. Paik ordered Jin to kill Jae Lee. ("The Glass Ballerina")
Who knows: Mr. Paik

Sawyer is a father

Sawyer is a Father
Summary: Sawyer believes he has a daughter. ("Every Man for Himself")
Who knows: Sawyer, Cassidy, Kate

Sun shot and killed Colleen

Sun shot and killed Colleen
Summary: On the Elizabeth, Sun shot Colleen, who later died. ("The Glass Ballerina")
Who knows: the Others, Sayid, Sawyer, Kate

Juliet asked Jack to kill Ben

Juliet asked Jack to kill Ben
Summary: Juliet asked Jack to kill Ben during the tumor removal operation through a video tape. ("The Cost of Living")
Who knows: Jack, the Others

Ben is not Alex's biological father

Ben is not Alex's biological father
Summary: Ben and the Others kidnapped Alex from Rousseau. Ben told Alex that her mother had died, so she never knew. ("The Man Behind the Curtain")
Who knows: Everyone
  • All the survivors knew this from Rousseau.
  • Due to Pryce, it also seems that at least the majority of Others knew of this.
  • Alex finally found out when Ben was captured in front of Rousseau, with Rousseau just blankly staring at her. Ben finally told her the truth. ("Through the Looking Glass, Part 1")
3x22 alex danielle promotional

Christian Shephard is Claire's father

Christian Shephard is Claire's father
Summary: Christian had an affair with Carole Littleton, who gave birth to Claire nine months later. Therefore, Claire and Jack are half-brother/sister. ("Par Avion")
Who knows: Christian, Carole Littleton, Lindsey, Jack
  • Claire didn't make the connection that Jack was her brother yet, since Christian never told her the name of his son. In addition, Christian never told Claire his own name. ("Par Avion")
  • Once Jack made it off of the Island, Carole Littleton told Jack at Christian Shephard's funeral that Claire was on Oceanic Flight 815, believing that she did not survive the crash. ("There's No Place Like Home, Part 1")
3X12 ChristianClaire

Naomi was found

Naomi was found in the jungle
Summary: Naomi the parachutist crash landed on the island, and was found by Desmond, Charlie, Hurley and Jin. She was treated by Mikhail and brough back to camp, but they didn't tell Jack because they didn't trust him anymore. ("Catch-22") ("D.O.C.") ("The Brig")
Who knows: Everyone
No survivors

Sawyer killed Cooper

Sawyer killed Cooper
Summary: After being led to the Black Rock by Locke in order to kill Ben Sawyer discovered Anthony Cooper and in a fit of rage strangled him to death which Locke thanked him for.("The Brig")
Who knows: Locke, Richard Alpert
Sawyer kills cooper

Ben was not born on the island

Ben was not born on the island
Summary: Ben claims to everyone that he was born on the island ("The Man Behind the Curtain")
Who knows: Richard Alpert, John Locke
  • Richard met him as a child when he was still a member of DHARMA. He also helps Ben destroy them.
  • Ben tells Locke that he is right that he is a compulsive liar, and starts off by telling him that he was a member of DHARMA and killed them all. Once he tells him this though, he shoots Locke, and Ben assumes he left him to die in the pit.

Naomi is not with Penny

Naomi is not a member of Penny's search party
Summary: Naomi claims to have been searching for Desmond and to have been hired by Penny Widmore, when she is actually not.("Catch-22"), ("The Brig"), ("Through the Looking Glass, Part 1"), ("The Beginning of the End")
Who knows: Everyone on the island as well as Penny.
  • Charlie comes into contact with Penny in the Looking Glass and finds out that she is not a member of her search party. He manages to tell Desmond this before he drowns.
  • Ben tells Jack that Naomi is not who she says she is and is one of the "bad guys". He tells Jack if he contacts her boat, they will all die because of her.
  • Locke kills her without any explanation or compromising anything with her, which implies he somehow knew that she was bad for the island. Locke may have killed her because of his obsession with staying on the island, (the reason he blew up the submarine). He may believe, just as many of the survivors do, that the boat that is there and can take them away from the island.
  • When Desmond arrives back from the Looking Glass, he passes on the message to everyone at the beach and they radio Jack with the news.

Season 4[]

The Oceanic 6 are lying

The Oceanic 6 are lying
Summary: The Oceanic 6 are lying to the rest of the world about the crash, the number of survivors, the Island, and probably more. ("Through the Looking Glass, Part 1"), ("The Beginning of the End")
Who knows: Jack, Kate, Hurley, Sayid, Sun, Ben, Desmond, Lapidus, Locke, Walt, Penny, Henrik, Widmore, Cassidy, Carmen, Carole, and Abaddon.
  • All the members of the Oceanic 6 are hiding it.
  • Matthew Abaddon strongly suspects they are lying and there are people still alive.
  • Ben is off the Island.
  • Penny helps the 6 cover their tracks by transporting them to Indonesia.
  • It was Locke's original idea for them to lie, and when he gets off of the Island in the future, he would certainly know this.
  • Lapidus and Desmond escape the Island with the Oceanic 6, but do not arrive in Indonesia with them in order to cover the conspiracy.
  • Walt personally came to ask Hurley why they were lying.
  • Sun tells Widmore that he already knows they are lying.
  • Kate tells Cassidy that the Oceanic 6 are lying to explain how she knows about Clementine and Sawyer, and how Sawyer is still alive. Cassidy also knows Aaron is not really Kate's baby.
  • Hurley tells Carmen that the Oceanic 6 lied and the general outline of what happened on the island. ("The Lie")
  • Kate tells Carole they are lying before she goes back to the island so Carole will know Aaron is her grandson, hoping she will take care of him until Kate comes back. Carole also knows Claire is still alive and that she left the rest of the survivors and Aaron. Kate promises to bring Claire back to Carole.
4x01 BoardHatchMural

Hurley saw Jacob's cabin

Hurley saw Jacob's cabin
Summary: Hurley indicates to Locke that the cabin he is looking for is in the other direction, but when asked for some specifications, he pretends he was referring to the plane's cabin. ("Confirmed Dead")
Who knows: Hurley, Locke and Ben. Also Sawyer, Claire, and Miles, although they don't know what the cabin and Jacob are.
  • Locke and Ben both gave him surprised looks when he mentioned the cabin. After the attack on the Barracks, they ask him to help them find the cabin.
4x01 TBOTE Hurley peek-a-boo

Michael is Ben's spy on the freighter

Michael is Ben's spy on the freighter
Summary: Ben sent Tom to Manhattan to recruit Michael after his departure from the Island. After he agreed, they provided him with a fake name (Kevin Johnson), a fake passport, and a job as a deck hand on the Kahana, the freighter owned by Charles Widmore. Ben is doing this in an MEHP effort to stop Widmore from finding the Island. ("Meet Kevin Johnson")
Who knows: Michael, Ben, Tom, Locke, Hurley, Sawyer, Claire, Miles, Sayid, Desmond, Captain Gault, Frank, Keamy, Sun, Jin
  • After telling Locke in private first, Ben revealed the truth about Michael to Locke's group at the barracks. ("Meet Kevin Johnson")
  • After hearing his story, Sayid turned Michael over to Captain Gault as a known spy for Ben Linus; Desmond was present for this. ("Meet Kevin Johnson")
  • Captain Gault had Michael detained, and later told Keamy.
  • It is likely that the rest of the freighter crew are also aware of it.
  • Sun and Jin found out about it when they arrived on the freighter. ("There's No Place Like Home, Part 1")
Kevin Johnson

Charlotte can speak Korean

Charlotte can speak Korean
Summary: As Daniel, Charlotte, Sun and Jin make their way to The Staff, Jin notices that Charlotte seems to react emotionally when he speaks to Sun in Korean about the future of their child. He later confronts her that night, and after he threatens to hurt Daniel, Charlotte begins speaking to Jin in Korean. ("Something Nice Back Home")
Who knows: Charlotte, Locke, Faraday, Miles, Sawyer, Jin, and Juliet.
  • Jin found out after confronting Charlotte the night after they went to The Staff.
  • Later, on the way to The Orchid, Jin tried to tell the group something, and asked Charlotte to translate, reveiling to the people there that she spoke Jin's language. ("This Place Is Death")

Daniel's experiment caused Teresa to have Temporal Displacement

Daniel's experiment caused Teresa to have Temporal Displacement
Summary: While researching time travel as a professor at Oxford University, Daniel experimented on his then-girlfriend Teresa. However the experimented went terribly wrong, resulting in Teresa in a permanent coma-like state, her consciousness continuing to travel around in time.
Who knows: Faraday, Widmore, Abigail Spencer and Desmond.

Miles is Psychic

Miles is Psychic
Summary: Miles has the ability to communicate with the dead.
Who knows: Mrs. Gardner, Sawyer, Ilana Verdansky, Frank Lapidus, Charlotte Lewis, Daniel Faraday, Sun-Hwa Kwon, Lara Chang, Howard Gray, Naomi Dorrit, Matthew Abaddon, Hurley, Ben Jack, Kate and Richard Alpert.