Sayid

Pre-Crash: Sayid was captured and Mr. Inman taught him to torture so that Sayid could torture his own commanding officer in order to get information.
Later, Sayid uses his torturing skills and his superior, Omar, tells him that he's doing a great job and will soon be transferred to intelligence.
A woman is captured and Sayid recognizes her as his childhood friend, Nadia. He urges her to give him some names, but she refuses and he helps her to escape.
Later, the CIA wants Sayid help recover C-4 explosives and offer to tell him where Nadia is in return. Sayid turns on his former roommate, Essam, to get the information, but tries to get Essam to run away. Instead, Essam kills himself. Sayid talks the CIA into letting him stay one more day to claim Essam's body, which then put him on Flight 815.
Island: Sayid establishes himself as mechanical and tries to use the plane's transceiver to call for help, but it doesn't work.
Sayid is captured by and then becomes friends with island inhabitant Danielle Rousseau.
Sayid falls in love with the selfish Shannon Rutherford, but she is accidentally shot by another Flight 815 passenger.
When Henry Gale is captured by Rousseau, Sayid takes him back to the hatch as a prisoner and later discovers that he is not Henry Gale, but is probably one of the Others.
Michael wants to take a group across the island, but Sayid is suspicious and comes up with a plan to meet the group over there.
Post-Island: Sayid works for Ben, killing people on a list in order to protect his friends.
Strong Relationships: After some friction early on, Jack and Sayid have become really close. Sayid was also close to Shannon, and does well with Kate.
Rocky Relationships: Sawyer, who accused him of being a terrorist, Locke, who knocked him out when he was trying to get a radio signal, Ana-Lucia, who tied him up after she shot Shannon, and Boone, who didn't want him dating Shannon.

Sawyer

Pre-Crash: His birth name is James Ford. When he was young, his father killed his mother and then himself after the couple was conned by a man named Sawyer. When he grew up, Sawyer took on the name of the con man and learned to con.
One of his cons, Cassidy, figured out what he was doing and asked to be a part of it. The two conned together for awhile until he conned her. He ended up in prison, where Cassidy visited him to tell him he has a daughter.
Sawyer made a deal with the warden and was let out of prison. He anonymously sent his reward money to Cassidy's daughter.
He got news of where the real Sawyer was and went to Australia to kill him. After shooting the man, Sawyer realized that he had been conned and the man he shot was not the real Sawyer.
Island: Sawyer wants everyone to believe he is a jerk. He steals and hordes whatever he can.
Sawyer cons Jack and Locke and ends up with control of the guns. He and Kate seem to have a love/hate relationship.
Sawyer is captured by the Others, along with Jack and Kate. Sawyer and Kate are kept in cages. Kate climbs out of her cage and the two sleep together.
Strong Relationships: None
Rocky Relationships: Kate, Jack

Shannon

Pre-Crash: Shannon's father died in a car accident and her stepmother cut off the funds that were previously deposited into Shannon's account. Shannon won a prestigious internship to the Martha Graham Dance Company in New York, but her stepmother wouldn't help her financially and said that Shannon's father would have wanted her to take care of herself.
Boone tried to get some money for Shannon, but his mother knew what he wanted the money for and didn't give it to him. Shannon wanted to move in with Boone in New York until she could get on her feet. Boone said she couldn't because his mother offered him a job and he was moving from New York.
Shannon hooked up with different men, each time telling Boone. Boone then bought them off thinking he was helping Shannon, but it turned out that Shannon was scamming him in order to get the money she felt she deserved.
But one man, Bryan, scammed Shannon, leaving her with nothing. She must depend on Boone and, alone in the hotel room, they slept together. Then Shannon said she wanted things to go back to the way they were. The two of them got on Flight 815 to return to the U.S.
Island: There is a lot of tension between Shannon and Boone, especially after Shannon shows interest in Sayid. Boone begins hanging out with Locke, and Shannon helps Sayid translate some French maps.
Shannon and Sayid begin a relationship, but Shannon is upset when Sayid doesn't believe that she saw Walt, who should not have been on the island. She tells Sayid that he will leave her once they get rescued, but he says he will never leave her.
They hear whispers and see Walt, and Shannon runs after him. She is accidentally shot by Ana-Lucia and dies after 48 days on the island.
Strong Relationships: Sayid and Walt
Rocky Relationships: Boone

Sun

Pre-Crash: Sun was a lonely housewife who learned English in order to leave her husband, Jin. She had an affair with her English teacher, Jae Lee, who later committed suicide after Jin attacked him on orders from Sun's father, Mr. Paik.
Island: At first Sun seemed like a subservient wife. But she later broke out of her shell, even wearing a bikini. Sun did not reveal that she spoke English until she had to in order to save Jin. Once he found out she knew how to speak English, the two stopped talking to each other.
Jin and Sun reunited before Jin left on the raft in search of rescue.
Despite Jin's being sterile, Sun finds out she is pregnant and promises Jin that she has never been with another man.
Juliet uses ultrasound to determine the date of conception of Sun's baby and discovers that she conceived on the island and Jin is the baby's father. However, no woman who had conceived on the island had lived to the third trimester. Even so, Sun is happy the baby is Jin's.
Post-Island: No friends or family show up at the hospital when Sun gives birth to a baby girl, though Hurley comes shortly after to visit. Hurley and Sun take the baby to Jin's grave. Sun says she named her Ji Yeon, as Jin had said he wanted.
Strong Relationships: Kate, Michael, and Jack, though they sometimes differ on their medical views. She also seems close to Hurley in the future.
Rocky Relationships: Jin, though they are really close and Juliet, who outed her to Jin about her affair.

Walt

Pre-Crash: Walt's mom, Susan, took him away from his dad, Michael, when he was too young to remember Michael. Michael fought for joint custody, but in the end, Susan convinced him that it was best for Walt if Michael just let him go. Susan did not give Walt any of Michael's letters.
Walt's stepfather noticed that weird things happened when Walt was around and didn't seem too comfortable with him. When Susan died suddenly, Walt's stepdad, Brian, went to Michael to ask him to go to Australia and get Walt, which he did. The two were returning on Flight 815.
Island: Walt had a hard time getting to know his father. He preferred the company of Locke instead, but his father forbid him from hanging out with Locke. Walt spent most of his time with his dog, Vincent.
Walt seemed to be able to make things happen and got very good very quickly throwing a knife. Locke said Walt was special.
After a fight with his father, Walt went out into the jungle and was chased by a polar bear. Together, Michael and Locke saved him.
Walt wanted to stay on the island, and so he burned the raft his father was building, but then went with his dad on the new raft. Walt was stolen by what looked like pirates, but we later found out it was Tom and some of the other Others.
Walt was released to Michael and the two left the island on a boat after Michael brought Jack, Kate, Sawyer, and Hurley to the Others.
Strong Relationships: Vincent, Locke, Shannon
Rocky Relationships: Michael

Libby

Pre-Crash: Libby, going by the name of Elizabeth, met Desmond in a coffee shop and gave him a boat.
Libby was in Santa Rosa Mental Institution with Hurley.
Island: Libby was with the Tailies and took on the chore of doctoring them. She worked closely with Ana-Lucia.
Libby and Hurley began a relationship and she even stopped him from jumping off a cliff.
Libby was shot by Michael when she entered the hatch at the wrong time.
Strong Relationships: Hurley, a romantic interest. She and Ana-Lucia worked closely together.
Rocky Relationships: None

John Locke

Pre-Crash: John Locke was not raised by his biological parents. He was sent from foster home to foster home and didn't know his biological mother and father until his mother found him and scammed him into thinking that he'd found his biological father on his own. His father, Anthony Cooper, befriended him, and then let it slip that he needed a kidney transplant. Locke was quick to offer his kidney, but after the operation, his father didn't want anything to do with him. Locke was obsessed with wanting to know why his father didn't want his friendship.
He met Helen and they began a relationship, but she wanted him to stop watching his father. He couldn't do this and Helen left him.
When Locke found out that his father was conning a family, he interceded and his father pushed him out of an eight story window. Locke survived, but was paralyzed from the waist down.
He began working for a box company. He wanted to do a Walkabout tour of the Australian Outback, but when he showed up in a wheelchair, the company said he couldn't go. They sent Locke home on Flight 815.
Island: After the crash, Locke gets sudden use of his legs. He believes that the island has healed him and that he must listen to the island and do what it asks.
At one point he sees something that he later describes as a beautiful white light (Ep: 1x4, Walkabout).
After he and Boone find a hatch in the ground, Locke believes it's his destiny to open it and he is so obsessed that he ends up getting Boone killed after he has Boone climb up a cliff and into a small plane.
Locke and a group get dynamite to blow the hatch open and they find Desmond inside. Locke's new purpose becomes punching in the code and hitting the execute button to reset the timer every 108 minutes.
He eventually resents having to push the button and comes to believe that it's just an experiment and that nothing will happen if they don't push the button. He locks Eko out and breaks the computer. When the timer reaches zero, the hatch implodes. Somehow, Locke and the others survive.
Locke then believes he must save Eko, but when Eko dies, he looks for another purpose.
Locke, along with Sayid, Kate, and Rousseau find The Flame Station. Locke plays a chess game on a computer and eventually beats it, which brings up some options. One of the options is to enter 77. After Locke comes out, the place blows up.
Locke finds Ben and finds out where the submarine is. He blows up (or possibly just makes it look like the sub blew up) the submarine so that no one can get off the island.
Locke hangs out with the Others and realizes that they have his father, Anthony Cooper. They want Locke to kill his father, but he can't and gets Sawyer to do it.
Strong Relationships: Eko, Claire, and Desmond (after their initial encounter)
Rocky Relationships: Jack and Locke have struggled for power and also struggle in the ideas of faith versus science. Locke is a big believer in faith. At first he takes on the role of Charlie's mentor and helps Charlie get off of heroin, but then their relationship changes when Locke starts hanging around Claire. He an Eko initially were friends and worked together, but that all changed with their opposite views on pressing the button.

Michael

Pre-Crash: When Walt was a baby, his mother, Susan Lloyd, told Michael that she was leaving him and taking Walt. She moved out of the country, and Michael fought for custody, but eventually gave up. Though he wrote to Walt all the time, Susan hid the letters from Walt.
When Walt was ten, Susan died, and Walt's stepfather, Brian Porter, didn't want Walt and flew to the U.S. to tell Michael to go to Australia and get Walt.
Michael went to get Walt and began the parenting struggle. They were flying home on Flight 815.
Island: Michael struggled to form a relationship with Walt. They often fought, and Michael was jealous of Walt's relationship with Locke.
Michael built a raft that could carry four people so that they could sail off to find rescue. He, Walt, Sawyer, and Jin sailed away on the raft, but Walt was stolen by pirates who blew up the raft. On pieces of the raft, Sawyer and Michael washed up on shore and met the Tailies. They eventually reunited with the other group of survivors.
Michael stole some guns and locked Locke and Jack in the armory to go after his son, whom he believed was communicating with him on the computer.
At the Others' camp, he briefly saw Walt and made a deal with the Others that he would bring to them Jack, Kate, Sawyer, and Hurley. Michael returned to the main beach and let non-Henry Gale go. To get control of the armory where non-Henry was being held, Michael shot Ana-Lucia, and when Libby walked in, he shot her too. He shot himself in the shoulder to make it look like he had struggled with non-Henry. He then took Sawyer, Jack, Kate, and Hurley across the island, where they were captured by the Others. In return, Michael and Walt were given a boat and coordinates, and they left the island.
Sayid and Desmond see Michael on the freighter. In front of Ray, Michael introduces himself as Kevin Johnson.
Strong Relationships: Sun and Jin. He and Jin started out as enemies, but later became close friends.
Rocky Relationships: Walt, Jack, Locke

Kate

Pre-Crash: Kate was on the run from the age of 24 after blowing up her mother's house with her stepfather inside. She had just learned that her stepfather was actually her biological father. Previously she had believed her father was Sergeant Sam Austin.
Marshal Edward Mars caught Kate, but she got away from him. He continued to pursue her.
Kate went by many different names, at one point going by Lucy and working with Cassidy to see her mother. At another point, as Monica, she got married. She called the Marshal and begged him to stop chasing her, but he said he would only if she stopped running. Kate left her husband.
Island: The last time the Marshal caught her, he was transporting her to the U.S. on Flight 815. He survived the crash, but died a few days later. Before he died he was able to tell Jack that Kate was a fugitive.
Kate bonded with Jack as she sewed a wound on his back. She also bonded with Sawyer. Kate wanted to be included on every adventure on the island and at one point got captured by the Others. Jack, Sawyer, and Locke had to give up their guns in order to get her back.
Later, she was captured by the Others along with Jack and Sawyer and she and Sawyer were made to live in cages and work breaking up and hauling rocks. She climbed out of her cage and hooked up with Sawyer.
After escaping, she went back to get Jack and ruined his chances to get off the island. Juliet told Kate that Jack saw her and Sawyer together and she broke his heart.
Post-Island: Kate's mother doesn't testify against her, so Kate is sentenced with time served, 10 years probation, and must stay in California. Kate agrees because of her son.
Kate's son is Aaron Littleton, but it seems that everyone other than the Oceanic Six, including Aaron himself, believes that Kate is his mother.
Strong Relationships: Sun, as she was one of the first to know that Sun spoke English. She and Sayid work well together.
Rocky Relationships: Jack, Sawyer, and Kate are in a love triangle. Kate and Juliet are both competing for Jack's affections.

Juliet

Pre-Crash: Juliet had been on the island for about three years at the time of the plane crash. Previous to that, she was in Miami working on fertility experiments and was successful in impregnating her ill sister.
She was approached by Dr Alpert to work for Mittelose Bioscience, but she was very sad to say that her ex husband, Edmund Burke, would never let her and the only way would be if he got hit by a bus. Later, Edmund was hit by a bus, most likely as a result of someone at Mittelos, and Dr. Alpert approached Juliet again.
Juliet took the job, despite having to leave her sister behind with no contact for six months.
Juliet couldn't figure out what was wrong with the pregnant women, and they kept dying. She told Ben she thought it was happening at conception and she wanted to take a woman back with her to Miami. Ben said no and she said it was time for her to go home.
Ben told Juliet that her sister's cancer had returned, but that if she stayed and helped them, Jacob would make the cancer go away.
Juliet stayed. Three years later she discovered Ben had cancer and believed he lied to her, but he showed her live footage of her sister playing with her toddler son.
Island: Unlike the rest of the Others, Juliet doesn't seem to bow to Ben's wishes. She knew that Ben had a crush on her. Ben got her lover, Goodwin, who was married, killed. She interacts a lot with Jack while Jack is in captivity in the Hydra. She tells Jack that he can trust her and secretly asks him to let Ben die when Ben is counting on Jack to remove a tumor from his spine.
When Jack tells Tom of Juliet's plan, Juliet denies it. Ben wakes during the surgery and talks to Juliet. She comes out and asks Jack to save him, later telling him that Ben had promised she could go home.
Juliet helps Kate, Sawyer, and Karl escape off the smaller island by shooting Danny Picket.
Juliet claims to have been left behind when the Others left their camp, but it was a plan devised by Ben to get Juliet into the survivors' camp.
Strong Relationships: Jack
Rocky Relationships: Ben. Juliet doesn't seem to like Ben, but it's his decision whether or not she leaves the island.

Jin

Pre-Crash: Jin lost his job as a doorman when he let a man take his son into the hotel to use the bathroom. He met Sun after bumping into her and the two formed a relationship, despite the fact that Jin was poor and Sun was well off.
Sun knew it would be a problem with her father if she married Jin, but Jin asked him anyway. He said it was okay as long as Jin worked for him. Jin agreed, but quickly discovered that Mr. Paik was into shady dealings and Jin was expected to use violence in order to enforce Mr. Paik's wishes.
Island: Speaking only Korean, Jin could not understand the other survivors and wanted he and Sun to keep to themselves. He got into a scuffle with Michael over a watch that Michael found that Jin thought he had stolen. Because of the language barrier neither understood what was really going on and they got into a fight. Sayid handcuffed Jin to a piece of the wreckage.
When the raft burned, many fingers pointed at Jin, and Sun revealed the fact that she speaks English in order to save him. He hadn't known she could speak English and it caused a rift.
A new raft was built and Jin sailed away in search of rescue with Sawyer, Michael, whom he'd become good friends with, and Walt. Walt was taken by pirates and the raft blown apart. Jin washed ashore and was captured by the Tailies. The Tailies later captured Sawyer and Michael and they discovered that they were all on the same flight.
Jin, Sawyer, Michael, and the Tailies made their way to the other survivors' camp and Jin and Sun reconciled.
Jin had always wanted a baby, but Sun couldn't have children. Sun revealed to him that it is he who can't have children, yet she is pregnant. She swears that she was never with another man.
Strong Relationships: While rocky at times, overall Jin and Sun have a solid relationship.
Rocky Relationships: Jin and Michael were at first enemies, but ended up being really close friends.

Claire

Pre-Crash: In her late teens, Claire was driving her mother somewhere and they were in an accident. Her mother was on life support for several months, and either still is or has since died.
Claire's biological father, whom she believed dead, paid for her mother's hospital bills and told Claire he was her father. Claire never got his name, so she doesn't know that he is Christian Shephard, father of Jack Shephard.
Claire got pregnant and planned to give the baby up for adoption after the baby's father left her. At the beginning of her pregnancy, she saw a psychic who wouldn't do her reading, but she later convinced him. He told her that she had to raise the baby herself because danger surrounded the baby.
Claire went to an adoption agency, but after two pens ran out of ink and she wasn't able to sign the documents, she changed her mind. The psychic convinced her to give her baby to a couple in L.A. and that she must take Flight 815, which left the next day.
Island: Claire was abducted byEthan and disappeared. When she returned, she couldn't remember anything that had happened to her since the crash.
She gave birth to a baby boy, who was taken by Danielle, but Charlie and Sayid got him back and she named him Aaron.
Claire began to get her memory back and remembered a medical hatch where they'd kept her. She also remembered that Rousseau had helped her to escape.
Claire came up with a plan to get rescued. She tied a message to a tag on a bird's foot hoping that a scientist would find the note and help them to get rescued.
Strong Relationships: Her son, Aaron. She is also close to Locke and Kate. Sun often watches the baby for her, and she is close to Jin as well.
Rocky Relationships: She and Charlie have had some ups and downs. They became friends quickly, but Charlie became overbearing with her and Aaron. She didn't want anything to do with him after she found out he was a drug addict and was hiding heroin. They reconciled again after the hatch implosion.

Jack Shephard

Pre-Crash: Jack miraculously saved a woman, Sarah, and then married her. She later left him for another man. At one point, Jack suspected that Sarah was seeing his overbearing father, who, like Jack, was a spinal surgeon at St. Sebastian hospital.

Jack accused his alcoholic father, Christian Shephard, of sleeping with his wife, and also turned him in to the medical board for operating while under the influence. Jack went to Phuket, where he met Achara, and Christian went on a drinking binge in Australia, and that is believed to be the cause of his death. Jack went to Australia to search for him at his mother's insistence, and was returning to the states with his father's body when the plane went down.
Island: Being a doctor, most of the survivors looked to Jack as their leader, but Jack didn't want to be their leader. He finally came around, but often has conflict with the other strong personalities on the island.

Jack is attracted to Kate and in competition with Sawyer for her affections. He also seemed to be developing a relationship with Ana-Lucia before her death.

Jack was captured by the Others and forced to live in a small room. He formed a relationship with Juliet who persuaded him to remove a tumor from Ben's spine.

Juliet is shunned by the Others after shooting fellow Other Danny Pickett and goes with Jack to live on the beach with the Flight 815 survivors. Jack is very protective of Juliet.
Post-Island: Jack seems to always be under the influence of drugs or alcohol. He almost commits suicide, but stops in order to help a mother and son.

Jack desperately wants to get back to the island, and begs Kate to meet him. He tells her that they should be on the island, but she doesn't agree.

Strong Relationships: While once rocky, his relationship with Sayid is now very solid. He and Sun often work together to help the ill and wounded. He also had a strong relationship with Ana-Lucia and has developed a strong relationship with Juliet.

Rocky Relationships: Kate (he loves her so much he sometimes hates her), Sawyer (they are in competition for the same woman, but also disagree on how to survive on the island, yet sometimes they work well together), Michael (at one point Jack thought of Michael as an ally, but that all changed when Michael led them into the Others' trap), and especially Locke (Jack and Locke have always struggled for power, and Jack believes in science, while Locke believes in faith).

Charlie

Pre-Crash: Charlie's brother, Liam, talked Charlie into getting into a band with him. Liam was the lead singer and Charlie wrote a lot of the songs. They had one hit, but when Liam got into drugs, Charlie was soon to follow.
When the band broke up, Charlie wanted to get them back together, but Liam got clean and didn't want anything to do with the band.
Charlie met a woman and tried to get clean for her, but desperate for drugs, he stole from her and then she wouldn't have anything to do with him.
Island: At first Charlie thought everyone would know him because he thought of himself as a famous rock star. Locke helped Charlie get through heroin withdrawal, but later believed Charlie was back on the drugs.
Charlie got very close to Claire, and one day while walking through the jungle after Claire had some false labor, they were captured by Ethan Rom. As a warning for Jack to stop following, Ethan hanged Charlie, but Jack was able to save him.
Charlie stayed with Claire after she came back from the Others (after being kidnapped) and was there when her baby was born. When Danielle Rousseau kidnapped Aaron, Charlie and Sayid went and got him back.
After Claire found out about the heroin hidden in the statue of the Virgin Mary that Charlie had found, she didn't want him to come near her or her baby.
Claire began getting close to Locke, and out of jealousy Charlie wanted to make Locke look like a fool, so he helped Sawyer con Locke and Jack so that Sawyer could get control of the guns.
Charlie was with Eko when the hatch imploded, but didn't seem to be affected, other than losing his hearing for a little while. He and Claire reconciled.
Desmond began to see flashes and in many of these flashes he saw Charlie die. Desmond saved Charlie from death many times, but after 93 days on the island, Charlie sacrificed himself in The Looking Glass.
Strong Relationships: Hurley, though they had a rough patch when Hurley told Charlie he was a millionaire and then later wouldn't give him peanut butter from the hatch.
Rocky Relationships: He and Claire kissed, but Claire didn't want Charlie around after she found out about the drugs in the Virgin Mary statue. Eko and Charlie were very close until Eko stopped building a church with Charlie in order to push the button in the hatch. For a while, Charlie felt that Jack didn't respect him. At one point, Charlie looked up to Locke as a mentor, but then Locke started getting too close to Claire.

Boone

Pre-Crash: When Boone was a kid, his mother married Shannon's father. Shannon was a couple of years younger than Boone and he was always in love with her. He often got her out of bad situations. More than once he paid men to leave her, but realized Shannon was scamming him in order to get money.
When Shannon herself was scammed, she went to Boone and the two slept together. Shannon told him things would return to the way they were. They got on Flight 815 to return home.
Island: Boone wanted to help people, but didn't have the skills that Jack has. Before long, he found a friend in Locke and the two found a hatch that they dug out and tried to get into. After 41 days on the island, Boone was killed by injuries sustained from falling in an airplane that he climbed into following Locke's instructions and visions.
Strong Relationships: Locke, his mentor
Rocky Relationships: Shannon, his stepsister with whom he had a love/hate relationship

Ana Lucia

Pre-Crash: Ana-Lucia worked at the LAPD as an officer. Her mother was the chief. While newly pregnant and on duty, Ana-Lucia was shot and lost her baby. She later shot and killed the man shooter. Her mother suspected and said she would help, but instead, Ana-Lucia resigned.
Ana-Lucia went to work in an airport as a security guard. One day in the bar she met Jack's father, Christian, and he persuaded her to escort him to Australia as his body guard. After going to Australia and seeing a run-in Christian had with a woman, Ana-Lucia decided to return to the states, putting her on Flight 815.
Island: Ana-Lucia is a tail section survivor. She quickly became the leader of the group and eventually led the remaining survivors across the island to meet up with the survivors of the fuselage section.
As they got close to the other camp, they heard whispers and Ana-Lucia accidentally shot and killed Shannon Rutherford.
Ana-Lucia later made amends with Shannon's boyfriend, Sayid, but she never really fit in with the group. After 65 days on the island, she was shot and killed by Michael who had made a deal with the Others in order to get his son back from them.
Strong Relationships: Jack, who had met her before the crash, and Libby, who was also a tail section survivor.
Rocky Relationships: Sayid, after the shooting of Shannon they were enemies, but Sayid later told Ana-Lucia that he didn't blame her for Shannon's death, he blamed the Others.

Henry Gale / Ben

Island: He was first known as Henry Gale, but Sayid discovered that he was not Henry Gale. He was still known as Henry, though, because he wouldn't divulge his real name. It wasn't until much later that we learned his real name is Ben. He had a tumor on his spine, which Jack removed.
Ben didn't start getting better until Locke was around him. Ben took Locke to see Jacob, whom Locke couldn't see at first. Shortly after, Ben shot Locke.
In flashbacks, we learned that Ben came to the island as a boy, grew up to work for Dharma, then joined the hostiles to get rid of Dharma.
Strong Relationships: Unknown, but seems to be a leader among the Others. The one person he seems to have a strong relationship with is Alex, but the details of their relationship is not yet known.
Rocky Relationships: He seems to have a rocky relationship with Juliet and also Jack.