Template:Infobox Lost character Katherine Anne Austen is a fictional character on the ABC television series Lost, played by Evangeline Lilly. She is the de facto female lead.

Born and raised in Iowa, 29 year old Kate is the daughter of diner worker Diane and Sam, a U.S. Army Ranger and Gulf War Veteran, who taught Kate to track deer in the wild during her childhood. At an early age she befriended Tom, and together they buried a time capsule beneath a large tree. Kate's parents later divorce, and Diane marries an abusive alcoholic named Wayne. As an adult, Kate takes out an insurance policy on her mother's home before blowing it up with Wayne inside, which she confesses to her mother before disappearing. Diane calls the authorities, resulting in Kate's arrest at a bus station by Edward Mars. she is handcuffed behind her back. As he drives her to her arraignment, a horse on the road causes him to lose control of the vehicle and crash, allowing Kate to escape. Kate travels and confronts Sam, realizing that he was in Korea at the time of her conception, and Sam reveals that Wayne is her biological father. Sickened by her relation to Wayne, Kate continues her fugitive lifestyle, but remains determined to learn why her mother surrendered her to the police. Under the alias of Lucy, she meets an out-of-luck con artist named Cassidy Phillips, who helps her confront Diane in a diner restroom, where Kate learns that despite Wayne's abusive nature, Diane still loved him. Before she leaves, Diane warns Kate that when she next sees her, she will immediately call for help.

Kate flees to Miami, dating and marrying a police officer named Kevin. Following the wedding, Kate calls Mars and begs him to stop looking for her, which he agrees to do, under the condition that she finally settles down, something that Kate knows she's incapable of doing. After almost becoming pregnant and Kevin's purchase of two Oceanic tickets to Costa Rica for their honeymoon, Kate confesses her fugitive past and laces his drink with a sedative before disappearing. After months of traveling around the country under numerous aliases, license plates and hairstyles, Kate learns that Diane is dying of cancer, and decides to visit her. She reunites with her childhood friend Tom, who helps her dig up their time capsule, containing a variety of items, including his small toy airplane. Tom, now a doctor, arranges a meeting between Kate and Diane. As Kate tries to apologize to her, Diane screams for help, prompting Kate to flee the hospital with Tom. A policeman opens fire on their getaway car, killing Tom and forcing Kate to flee the scene of the accident, leaving behind Tom and his childhood toy.

Months later Kate stages a robbery in New Mexico with several criminals to infiltrate a bank's safe deposit box, where the toy airplane is stored, shooting the leader in the leg to prevent him from hurting the other customers and calling the police. She flees to Australia where, while sleeping in a barn, she is discovered by a farmer. Posing as a Canadian hiker, Kate works on the farm for three months, saving her wages in a hole in the pantry. The farmer catches her attempting to sneak away, and offers her a ride into town the next morning. During the journey however, Kate discovers that the farmer has learned her real identity and notified Edward Mars of her whereabouts, in exchange for the $23,000 reward. Kate grabs the wheel and crashes the truck into a field but instead of running, helps the unconscious farmer from his vehicle, giving Mars time to pursue and arrest her. Escorting her to the airport in handcuffs, Mars briefs local security officers on Kate's fugitive past and reveals his locked carry-on case containing five firearms. Boarding the plane, he handcuffs Kate to her seat in the middle of the row, near the midsection of the plane. As the plane is bombarded with escalating turbulence, Mars is knocked unconscious by luggage from the overhead compartment. Kate steals the keys to the handcuffs and attaches an oxygen mask to Mars before taking one for herself, as the plane splinters and crashes onto the island.

Having survived the crash, Kate discards her handcuffs and stumbles out of the jungle to encounter a wounded Jack, whose wounds she agrees to suture. That night, the two explore the inland area to search for the missing cockpit, accompanied by Charlie. The three discover the cockpit and Seth Norris, the surviving pilot. As they recover the radio transceiver, they are thrown into disarray by the arrival of the "Monster," whose rampage kills Seth. Kate returns to the beach with Jack and Charlie and later joins several survivors who accompany Sayid as he attempts to transmit a distress signal. Upon returning, Jack tells Kate that he knows she is a fugitive. She examines the injured marshal, only to be strangled. She asks Sawyer to kill him on her behalf, but Mars eventually takes his own life, knowing that he had only several painful days left to live. Later, after Jack discovers the caves, Kate decides to remain on the beach. She prepares to help Sayid locate the source of the looped distress call, but after Sawyer informs her of Jack being in a cave in, she abandons her post to help. She and Sawyer also share the first kiss on the show. When Sawyer is being tortured by Sayid to find Shannon's missing asthma inhalers that they believe he has, he says he will tell her if she kisses him. After they kiss, he reveals he doesn't have them and Kate punches him.

When she discovers the marshal's case, she and Sawyer fight to gain possession, but she eventually informs Jack, who confiscates it from her. She later informs Nikki and Paulo of its original whereabouts. Kate helps Sun with her garden, learning that she understands English. Kate continues to maintain a helpful attitude throughout the camp, as she joins the search party for the kidnapped Claire and Charlie, returning only with the latter. When Claire returns two weeks later, Kate also helps capture Ethan. Later, Sawyer seeks Kate's help in tracking a boar he claims to be constantly harassing him. Kate jokes about his predicament, but agrees to help nonetheless. They camp out and reveal truths in a game of "I Never" where Kate admits she has killed someone. Whilst in the caves with Jack, she is sent to retrieve alcohol when Locke carries a mortally wounded Boone. She becomes sidetracked when she discovers Claire in the jungle going into labor, and must deliver the baby without Jack's help.

Kate grows concerned over Jack's well-being, and drugs him in order for him to get some deserved sleep. However, Kate and Jack later discover that the key to the gun case is missing; they find Shannon holding Locke at gunpoint later in the jungle. After Rousseau arrives on the beach to warn the camp of the Others' imminent arrival, she takes Kate, Jack, Locke, Hurley and Arzt to the Black Rock, where they attempt to carry dynamite to the hatch discovered in the jungle. After the sudden demise of Arzt, Kate volunteers to carry dynamite in her backpack; she discovers that Jack switched her bag moments before handing it to her. Arriving at the hatch, Kate helps prepare the dynamite. Once the hatch door is blown open, she and the others peer inside.

Despite Jack's objections, Kate and Locke descend into the hatch, Kate entering first. Once inside, she is caught by Desmond, and tells her to tie up Locke, until he reveals Kate's criminal past. Kate is tied up, gagged, and locked in the food pantry, where Locke slips her a knife with which to free herself. Kate crawls through the air vents and arrives in a room with a computer, where she overpowers Desmond after Jack arrives. She accidentally damages the computer in the crossfire, causing Desmond to panic and flee. When Jack returns, Kate is placed on a rota to enter the numbers into the computer. As she and Jack play golf one day, they encounter Mr. Eko carrying a critically injured Sawyer. The rest of the tail-section survivors also arrive, along with Jin and Michael. Kate stays with Sawyer around the clock while he slips in and out of conciousness. Jack makes her take a break and asks her to go get some food for Sawyer. While picking fruit Kate sees a black horse from her past. When she returns to the hatch she hallucinates that Wayne is channeled through Sawyer and Kate freaks out. Later she is sitting in the jungle when Jack come along wondering what she is doing out here. She says she is sorry that she is not a perfect and good as him, and that this place (the island) is driving her nuts. Kate then kisses Jack but then runs off back to Sawyer. She partially confesses her crime to Sawyer who then wakes up. Kate leads Sawyer outside where they both see her black horse. When Michael runs off in search of his son, Kate volunteers to follow him, only for her offer to be rejected by Jack. Adamant to help, Kate follows them from a distance, but gets captured, tied up and gagged by Tom. She is held ransom for the weapons from the armory. Sawyer is angry and threatens Tom while Jack hesitates to give up the guns. After Jack gives up the guns, Sawyer then sympathizes with her actions, while Jack gives her the cold shoulder.

Later, Kate finds herself a victim of a long con, conducted by Sawyer, supposedly in order to gain access to the armory's remaining weapons and the camp's medicine but in reality to push her (and others) away because he was getting too close to them. When Claire's baby falls ill, Kate joins her on a trek into the jungle to seek Rousseau's help. The three head inland, where they discover the Staff station. Inside, Kate examines the locker room, where she discovers a box of theatrical props and costume, including a fake beard worn by Tom. Failing to find what Claire was looking for, Kate returns her to the camp. Sun confides in Kate when she learns that she is pregnant, who helps her come to terms with the sudden news. Later, Kate and Jack discover a mysterious and unnoticed food drop in the jungle. They return to the hatch, where hostage "Henry Gale" is exposed as an impostor. Later, Kate joins Jack on a trek back to where they encountered the Others. On the way, they fall for one of Rousseau's traps, and are momentarily caught in a net together. The two make camp, where Kate apologizes for kissing Jack. He says he isn't sorry that she kissed him, then an exhausted Michael stumbles out of the bushes.

Michael invites her to follow him to the Others' camp when he recovers, to which she accepts. However, upon learning that Ana Lucia has stolen Sawyer's personal gun, Kate, Jack, Locke and Sawyer rush to the hatch to find her dead, and Michael and Libby severely injured. Kate scolds Jack when he decides to find the escaped Henry, reminding him that Libby is in dire need of medical assistance. Kate helps carry the two bodies to the beach, where she comforts Hurley over the loss of Libby. The next day, Kate, Jack, Sawyer and Hurley join Michael as they head for the Others' camp. On the way, Kate and Sawyer kill two of the Others who attempt to ambush them, causing Michael to reveal his true reasons for bringing them along. They are then ambushed, gagged, tied up and taken to a pier. Kate witnesses Michael leaving the island with Walt, while she, Jack and Sawyer are taken away with the Others.

Kate wakes up in a locker room, with Tom supervising her. She is forced to strip naked and shower and she then accompanies Ben for breakfast. Ben forces her to handcuff her hands and barefeet. She is then placed in a cage opposite Sawyer. The two are told to work for the Others, under the watchful eye of Pickett. When Sawyer rebels against the Others, Kate is held at gunpoint until he cooperates. Later, Kate climbs out of her cage and attempts to escape with Sawyer. Sawyer refuses to leave and finally reveals that there is no way off the island because they are on a different island than the one they crashed onto. The two have make love and while cuddling, Sawyer admits his love for her, the two of them unaware that they were being watched briefly by Jack on a surveillance video. Kate is then forced to watch as Pickett is about to kill Sawyer, in revenge for his dead wife. When Jack radios her via Pickett's radio, informing her that she has a head-start to escape, she and Sawyer lock Pickett inside the cage and run towards the beach. They encounter Alex, who gives them her boat in exchange for rescuing her brainwashed boyfriend, Karl. Upon arriving on the beach, however, they are held at gunpoint by Pickett, until Juliet arrives and kills him. Jack radios her again, and tells her never to return for him. However, Kate is unable to abide by his request.

Upon arriving back on the main island, Kate demands that she and Sawyer head back to rescue Jack. When arriving on the beach, she scolds Sayid and Locke for not bothering to rescue him, telling them that she owes Jack. She heads into the jungle, with the two in pursuit, and finds Rousseau, who agrees to help her after learning of Alex's status. The four trek into the jungle, where they discover the Flame station. They are greeted by Mikhail, who poses as an innocent surviving DHARMA member, but is exposed as an Other. Kate and Sayid take him hostage, as well as Bea, found hiding in the basement. Upon leaving the station that night, Kate witnesses its destruction. The four, along with Mikhail, resume their hike, eventually coming across a set of sonar panel fences. Kate suggests climbing over them to avoid the sonic barrier, and the four eventually arrive at the Others' barracks, where Kate is appalled to see Jack bonding with Tom. Kate rushes in that night to rescue him, but is captured. Her hands and barefeet are tied and she is gagged as Jack explains what is going on. Later she is gassed and wakes up the next morning in the jungle, handcuffed to Juliet. The two constantly bicker as they are chased by the "Monster." They soon trap it outside the sonar fencing when Juliet unlocks the handcuffs. Kate finds Jack unconscious in one of the barracks, and apologizes for the trouble she caused. She returns to the beach with Jack, Sayid and Juliet.

Upon returning, Kate is still wary of Juliet. When Claire falls ill suddenly, Juliet explains to her and Jack about the deaths of pregnant women on the island. Kate grows concerned over the fate of Sun, and cautions her when she begins questioning Juliet. Later, she discovers Sayid with a satellite phone. She learns of Naomi's arrival, and of Juliet's true purpose for being in the camp. She breaks Sayid's word, and immediately informs Jack of Naomi's presence. That night, during a camp discussion, Jack and Juliet admit to being dishonest. Kate is then shown their plan to deal with the Others' kidnap attempt the next morning. However, after Karl arrives to warn then of the Others' imminent arrival, Kate travels to the radio tower with Jack and the majority of the camp. While going there Sawyer says she is going back to check on the others and Kate says she is going with him, but he says no. Juliet goes with him, but before she leaves she kisses Jack. Later Kate is getting a rock out of her shoe when Jack comes over and tells her that Sawyer didnt mean it, that he was trying to protect her. He tells her that that is why he asked her not to go back for him. She askes him why he is sticking up for Sawyer and points out that Sawyer would never do the same for him. Jack replies: "Because I love you". She witnesses the backfire of Jack's plan, but presses on. They eventually encounter Ben and Alex in the jungle, at which point Ben is taken hostage, while Alex is reunited with Rousseau. Kate arrives at the radio tower, where she witnesses Locke stabbing Naomi in the back. She watches as Jack makes contact with Naomi's freighter.

Kate is ambushed by Naomi in the Jungle, but Kate manages to convince her that they mean her no harm, and when she is contacted via the radio phone, Naomi lies to the freighter about her injury and covers for the survivors. She is eventually killed by Locke who is convinced that the people on the freighter are not there to rescue them but to cause them harm. Kate meets up with the rest of the survivors at the cockpit, where she breaks the news about Naomi's death. When the survivors split between those wanting to stay on the Island and those wanting to be rescued, she chooses to remain with Jack and those trying to get off the island. The two groups split up, Kate follows Jack in an attempt to make contact with the rescue party. Kate is upset to see that Sawyer goes with Locke. While she and Jack are staring inside the remains of the cockpit of the plane, reminiscing about Charlie and the trip the three of them took there, they hear the rotors of a helicopter overhead. Kate is with Jack when Daniel Faraday parachutes onto the island and first speaks to them about being part of a rescue party.

Daniel Faraday tells Kate and Jack that he is there to rescue them but that members of his party ran into problems setting the helicopter down and have become separated. Kate and Jack join Daniel Faraday as he heads out to find his other teammates including Miles. Both Kate and Jack remain suspicious of Faraday who tells them he is there to rescue them. He carrying a gun, he doesn't explain why he was given gas masks, telling them that he didn't pack the box. The three find Miles, another member of the team who had landed near a rocky beach by the Ocean. Just as Jack approaches to check up on him, he takes Jack at gun point. Kate attempts to steal Daniel's gun but is ordered away by a frantic Miles. Miles accuses Kate of having killed Naomi, and then forces Jack and Kate to bring him to Naomi's body. They tell him that Naomi was killed but not by them, but by John Locke who believe that the rescue party is there to harm them. Once the body of Naomi is found, Miles realizes that she was indeed killed by Locke. Juliet and Sayid turn up in time to disarm Miles and Faraday. The group continues looking for the helicopter and its pilot and surmise that Charlotte has probably been found by Locke's group when they find Vincent the dog wearing Charlottes radio locator, they continue looking for the pilot, Frank Lapidus still unsure of the real motives of the party that has landed on the island. Once they are reunited with Frank, he tells that he managed to pilot the helicopter safely to the ground after hitting an electrical storm and there is enough gas to fly off the island. In "The Economist" Kate joins Sayid and Miles as they journey to the Barracks, in hope of freeing Charlotte. As they enter the village it appears to be empty, until they hear noises. They find Hurley tied and gagged in a closet. Hurley however turns out to have been playing along with a plot to ambush the group orchestrated by Locke. The group is captured by Locke who is hoping to get information about the landing party and are separated throughout the barracks in different rooms. Kate ends up in the same room as Sawyer. Sawyer asks her why she wants to go back since she will wind up in jail. He asks her to give them a chance to "play house."

Kate lives at the barracks with Sawyer for a period of two days. She is very interested in finding out what Miles knows about her past. She speaks to Locke about letting her see and talk to Miles, but Locke who is frustrated over not being able to make any progress getting information out of the prisoner says no. Kate, not willing to take no for an answer, finds out where Miles is being held captive and asks him to tell her what he knows about her. Miles makes a deal with her to tell her everything if she can manage to arrange a meeting between him and Ben. Kate visits Sawyer in order to get his help in freeing Ben. She asks him to help free Miles. Sawyer distracts Locke long enough for Kate to free Miles. Sawyer then tells Lock of her plan. When Locke gets his gun and flashlight and goes to check on the prisoner but finds that he is missing. Meanwhile, Kate has taken Miles to see Ben. After speaking with Ben, Miles tells her that the freighter crew know she is a criminal and that she will be prosecuted if she ever leaves the island. They are soon caught by Locke who banishes Kate from the Barracks. She returns to Sawyer who says he will protect her and she stays the night, but they do not make love. In the morning, she tells him that she is not pregnant. Sawyer is relieved, but Kate is hurt by his reaction. He also criticizes her for going back and forth between him and Jack, which angers her. She slaps Sawyer in anger before leaving.

In "Eggtown", Kate goes on trial for her father's murder. She is later released on ten years probation, providing she does not leave California. Kate's mother, the prosecution's star witness, tries to reconcile with Kate, and then decides not to testify. It is revealed that she is raising a child, Aaron, possibly Claire's son (see below).

As she starts her first trial, she is forcibly put into handcuffs. During the trial, Jack takes the stand as a character witness, saying that Kate acted bravely and saved the lives of the Oceanic six demonstrating heroic self sacrifice. Kate appears to be unable to handle Jack's testimony and asks that he stop. On cross examination, the prosecution asks Jack whether he loves Kate. Jack becomes emotional and tells the jury that he no longer loves her. After Kate's mother refuses to testify, Kate takes a plea deal of probation, as she leaves the court house through a back exit she meets Jack who was tipped off by her lawyer. Jack tells Kate that he lied and that he still loves her, he again becomes very emotional as he asks her for a date. Kate turns him down because of his refusal to see her son. She leaves in a cab. When she gets home she is greeted by a woman who has been looking after her son. She goes upstairs to her son and hugs him while calling him "Aaron". It could be speculated that this is Claire's Aaron from the island, and for whatever reason, (perhaps Claire died while on the island and asked Kate to mind her son) Kate now looks after the baby off the island, due to the strange nature of the cover-up stories the Oceanic Six appear to be spinning.

In Through the Looking Glass, Jack and Kate agree to meet near the airport. Jack informs her of an unidentified person's funeral and she asks him why should she have gone. Jack then tells her that they need to return to the island. She leaves, saying that "he's gonna be wondering where I am." Kate does not appear to want to return to the island.

The character of Kate Austen (and by extension actress Evangeline Lilly) has made an impact upon the world at large. In 2007 she was voted #1 Sexiest Woman on Televion by TV Guide and made FHM's Top Sexiest as well. Her influence goes beyond sex appeal though as spiritual website Beliefnet has named her among the Top 10 Most Empowering Women on TV Today along with contemperaries Betty Suarez and Claire Bennet.

• In the original plot for Lost, in which Jack dies when the group finds the cockpit, Kate was to emerge as the leader for the survivors, motivating them to build shelter and begin considering life as permanent residents of the island.^[1]
• In the original description for Kate, she was a slightly older woman separated from her husband, who went to the bathroom in the tail-section of the plane. However, that idea ended up being used for Rose and her husband Bernard.
• Yunjin Kim originally tried out for Kate. The producers liked her but didn't think she was right for the part, so they wrote the role of Sun-Hwa Kwon for her.^[1]

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