Aside from a love for hoops, it would seem that Lucas and Nathan are two young men with little in common, but they are bound by the dark secret that they share the same father. Nathan is the star of the high school basketball team and local town hero, while Lucas is the only child of a single working mom. Now the two boys' lives collide when a twist of fate puts Lucas on Nathan's team and the half-brothers compete, not only for control of the court, but also for the heart of Nathan's beautiful girlfriend Peyton.
Lucas blows his first Varsity game and decides to quit the team. The wedge between Nathan and Peyton continues to grow after Peyton tires of Nathan's jabs at Lucas. Meanwhile, Keith forces Karen to deal with her feelings for Dan after she refuses to step foot in the high school gym to support her son.
Frustrated by Lucas' growing popularity at school, Nathan searches for Lucas' weak spot, and finds it in Haley. Meanwhile, Peyton is furious with Lucas for submitting her drawings to the local newspaper without her knowledge. Karen faces her past and Brooke lets her feelings for Lucas be known.
Haley convinces Lucas to go with the team to an after-party at Nathan's beach house in the hopes that the guys will become closer. When Lucas sees the wealth that was denied him, he finally confronts his mother about why she let Dan ignore them. Meanwhile, when Nathan's mom returns home to find a very angry son, she turns to Karen for advice.
Lucas asks Keith to play with him in the annual "Father and Son" basketball game, and realizes he got the better father figure after Dan publicly humiliates Nathan on the court. Also, Peyton has a hard time dealing with the anniversary of her mother's death and finds a comforting ally in Whitey.
When Whitey throws Lucas and Nathan off the bus due to their misconduct on the basketball court, not only does it leave the two brothers stranded 30 miles from home, but they encounter a carload of punks who threaten them with a gun. Injured during the game, Brooke needs Peyton to drive her home and in, an unlikely turn of events, Peyton asks Haley for help. Meanwhile, Karen and Keith attend a business function and tempers flare when Dan and Deb are seated at their table.
The night of Dan and Deb's annual basketball appreciation party stirs up old wounds and new feelings as Karen makes a new friend, Keith faces off with his younger brother once again and Lucas finally makes his move on Peyton. Also, Haley and Nathan grow closer until Brooke spreads a vicious rumor that leaves Haley devastated.
Looking for some fun, Brooke and Peyton crash a college party, but things turn ugly when one of the guys in the dorm drugs Peyton. After Brooke calls Lucas for help, the two bond over caring for a sleeping Peyton, prompting Lucas to look at Brooke in a new light. Meanwhile, Haley gives Nathan another chance (thanks to Brooke) and the two go on their first date.
After fighting with his father and Haley, Nathan succumbs to the pressure he is feeling and takes amphetamines to help his game. However, he isn't prepared for the destruction the drugs do to both his body and his family. Meanwhile, Peyton goes to Lucas to rekindle their relationship, but when she arrives at his house, she catches him with Brooke.
After Whitey cancels basketball practice, Brooke convinces Lucas to let loose and takes him out for a wild night out on the town. Meanwhile, Deb instructs Dan to take Nathan away for a father-son weekend to try and rebuild their relationship, but things don't go exactly as she had hoped.
Unable to handle the pressure from Dan, Nathan decides to quit the basketball team and looks to Haley to help him fill his free time. Meanwhile, Brooke becomes increasingly jealous of Lucas and Peyton's growing friendship.
After Peyton receives the devastating news that her father is lost at sea, she and Lucas take an overnight trip to Hilton Head to identify a body that has washed ashore. Overcome with emotion, Peyton kisses Lucas. Meanwhile, an unexpected visit from Dan's parents leaves the Scott family in turmoil as numerous family secrets are revealed at Dan's birthday dinner.
On their way to pick up Karen from the airport, Keith and Lucas' car collides with an oncoming vehicle and an unconscious Lucas is left fighting for his life. Having witnessed the accident, Dan races Lucas to the hospital and must acknowledge that Lucas is his son in order to save his life. Meanwhile, Peyton decides to tell Brooke about the kiss she and Lucas shared.
While holding a vigil at Lucas' bedside as he lays in a coma, Karen meets her son's new girlfriend, and learns that Deb and Dan are divorcing. Most shocking of all, Karen is horrified to discover that Keith had been drinking just prior to the accident. Meanwhile, Nathan tries to win Haley back after she dumps him.
After his near-death experience, Lucas decides he made the wrong choice between Brooke and Peyton so he breaks things off with Brooke and secretly rekindles his romance with Peyton. However, the truth becomes obvious after he is rushed to the emergency room again and the girls come face to face in the hospital. Meanwhile, unable to pay his mortgage after paying Lucas' hospital bill, Keith puts his garage up for sale.
Nathan must decide which parent to live with after the divorce, but Dan decides to force his hand by threatening to reveal Deb's darkest secrets in court unless Nathan chooses him. Meanwhile, Lucas meets a beautiful stranger who starts his head spinning. Grammy Award-winner Sheryl Crow appears as herself and performs in Karen's Café.
The gang hits the road to Charlotte where Brooke is determined to win first place at the annual cheerleading competition, but when one of her squad falls ill, Peyton begs Haley to step into the cheerleader's shoes for a day. Meanwhile, after Whitey assigns Lucas and Nathan to the same room, tempers flare and Haley is caught in the middle.
Lucas, Nathan and Jake are auctioned off to the highest bidder in the annual "Boy Toy" charity auction and the night leads to surprising developments with old flames. Meanwhile, having missed out on the auction, Brooke ends up with Mouth and gives him the night of his life.
History seems to be repeating in Tree Hill as Lucas learns that Brooke may be pregnant and makes a decision regarding their future, while Brooke continues to give him the cold shoulder about the situation. Haley considers sleeping with Nathan and Karen gives Keith an answer.
While Nathan looks for an after-school job to pay his rent, Haley decides to throw a party at his apartment but panics when things get out of control. After a jilted Brooke realizes she was not invited to the festivities, she decides to crash the party with her new friend Nicki.
Lucas and Nathan bear the brunt of Dan's abuse as he coaches them into the playoffs, pushing both of them to their breaking points. Haley is stunned after Dan threatens her, causing her to reconsider her relationship with Nathan. Meanwhile, Whitey learns that his medical condition may be more serious than he first expected, and Dan learns a shocking secret from Deb.
After Lucas and Keith learn that Dan had a heart attack and is still in the hospital, they decide it is best for them to return to Tree Hill. When Deb learns about Haley and Nathan's marriage, she grows hostile. Meanwhile, angry that Lucas left Tree Hill without saying goodbye, Peyton and Brooke try to mend their friendship.
With the assistance of Peyton and Brooke, Lucas throws Nathan and Haley a wedding reception. Although Haley's parents support Nathan and Haley's marriage, Deb has a difficult time accepting it. Meanwhile, Dan's recent heart attack causes him to try and mend his relationships with Deb and Lucas.
Although Nathan and Haley are already married, Tim insists on throwing Nathan a post-wedding bachelor party, while Brooke throws Haley a bachelorette party. Meanwhile, Lucas tries to decide whether he should visit Dan in the hospital. Karen decides to go back to school and Nathan gets a job working for Keith at Dan's dealership.
Brooke's smug new neighbor quickly makes his presence felt among the Tree Hill gang, and even comes to Brooke's rescue when she is arrested for shoplifting. Nathan and Haley have their first post-wedding argument when he buys her a gift rather than a much-needed car. Lucas' attempt to help Dan with rehab ends in disaster when Dan reverts to his old ways. Peyton tries to organize an all-ages club and is tempted to try cocaine to seal the deal.
Felix organizes a "dare night" to test the limits of his new classmates. While out playing the game, Lucas meets a mysterious new girl, Anna. Peyton tearfully confesses to the church that she recently tried cocaine and Keith is caught off guard when a beautiful woman comes to the shop and begins flirting with him. Meanwhile, Karen goes on a date with Andy, her younger professor.
After Dare Night resulted in new arrangements; a midnight meteor shower finds Lucas sharing a romantic night with Anna. Andy surprises Karen with a dinner and Keith cooks for Jules on their first date. Brooke finds herself forming a mutually beneficial relationship with Felix and Peyton sets out to find an opening act for her club.
The opening of Karen's club "TRIC" brings together the people of Tree Hill. Lucas and Felix come to blows over Anna. After Chris quits his gig the night of the club opening, Haley must face her fear of performing to save the night for Peyton. Although Mouth tends to Brooke while she is drunk, Felix sneaks in and attempts to take the credit. Keith and Jules realize their relationship has reached a new level, while Dan deliberately tells Karen that Deb slept with Keith.
Brooke, Peyton, Haley and Anna have a slumber party at Haley's apartment where secrets and lies are revealed. Meanwhile, when Lucas and Nathan go on a road trip to a Bobcats game, Nathan reveals he is being tested for the genetic defect that caused Dan's heart attack and suggests Lucas do the same. After an awkward encounter with Keith and Jules, Karen and Andy share an intimate night together.
Although Lucas takes Anna as his date to the Tree Hill High Formal, he finds himself with Brooke at the end of the night. Meanwhile, Haley's musical obligations to Chris cause her to arrive late to the formal, which angers Nathan. Peyton finds herself struggling with the growing temptation to turn to drugs.
Concerned about his brother’s health, Nathan tells KarenLucas did not take the heart test. Meanwhile, Keith accepts Dan's offer to continue working at the dealership as vice president. Peyton must confront rumors at school that she is a lesbian, which affects her friendship with Anna, while the gap between Nathan and Haley continues to grow.
Haley is surprised when her older sister Taylor comes to town, but not as shocked as Nathan, who recognizes Taylor from a past tryst. Meanwhile, Brooke and Felix decide to become boyfriend and girlfriend, while Jake surprises Peyton when he shows up in Tree Hill. Anna confides a deep secret to Lucas.
Nathan comes clean with Haley about his past relationship with Taylor, but Haley continues to keep her emails with Chris a secret. Lucas and Karen remain at odds over his refusal to take the HCM test. Meanwhile, Keith surprises Jules with a proposal, and Brooke fights for better working conditions at her new job.
When Michelle Branch & Jessica Harp from the band "The Wreckers" perform at TRIC, Haley realizes her passion is to pursue her music career. Meanwhile, Lucas decides to move in with Dan, straining his relationships with both Karen and Nathan. Brooke runs for student council president, but quickly realizes she is taking on more than she bargained for. Peyton and Jake's friendship grows stronger.
Nathan descends into an emotional crisis as his marriage with Haley unravels. Karen continues to question Lucas' reasoning for moving in with Dan and Deb and Brooke becomes Student Council President with a little help from Mouth. Meanwhile, after much sexual tension, Jake and Peyton share their first kiss.
When Tree Hill High does a time capsule project, the gang confesses their most intimate secrets to an anonymous video camera. Nathan's anger over Haley's absence continues to grow, landing both Lucas and Nathan in jail. Peyton and Jake's feelings for each other heat up, while Felix throws Brooke a party to celebrate her new gig as student body president. Meanwhile, when brought to court, Lucas opts to live with Dan and Deb rather than Karen.
It's Keith and Jules' wedding day and the event has turned the town upside down. Brooke asks Lucas to take her to the wedding as his date, Nathan makes an important decision involving his marriage to Haley, and Jake and Peyton take a big step in their relationship. Meanwhile, Karen and Andy discover Jules' secret relationship with Dan.
Keith has a violent confrontation with Dan after learning Dan paid Jules to sleep with him. Anna turns Felix in to the school authorities after discovering he was the one who defaced Peyton's locker. Meanwhile, Lucas and Brooke discuss the possibility of her leaving Tree Hill for good, while Nathan decides to go get Haley and bring her home.
On his way home from seeing Haley, Nathan stops to visit Taylor hoping for some fun and maybe more. Meanwhile, Anna gets a surprise visit from her old girlfriend and is inspired to tell her parents about her sexuality. Also, Lucas works with Andy to bring Dan down, Karen puts her foot down with Brooke and Peyton and Jake continue to hide baby Jenny from Nicki.
Nathan's Uncle Cooper comes into town to take Nathan and Lucas on a racing trip. On the track, Nathan and Lucas are challenged to a race by the beautiful Daytona and her smart aleck brother Garrett, but things go horribly wrong when Nathan loses control of his car and crashes into a wall. Meanwhile, Deb's addiction to pain pills intensifies and Dan exposes Andy's relationship with Karen to his class.
Following a racecar accident, Nathan dreams of what life would have been like if Dan had stayed with Karen and Lucas instead of marrying Deb. In this imaginary world, Lucas would have had the wealth and stature and Nathan would have been the one to grow up on the wrong side of the tracks.
Nathan is released from the hospital and returns home to a pile of unpaid bills and an eviction notice. Lucas, Peyton and Brooke throw a fundraiser at the River Court to raise money, but Dan is the one that comes to Nathan's rescue. However, his gift comes with strings - he wants Nathan to ask Haley for an annulment.
In the first part of the two hour second season finale, Lucas and Brooke head to New York for an overnight stay with Haley. Peyton is elated when she gets the band Jimmy Eat World to perform at TRIC in time for Jake's release from jail. Meanwhile, Andy invites Karen to spend the summer in New Zealand.
In the second part of the two hour season finale, things heat up between Lucas and Brooke when he finally tells her the way he feels, Peyton has a surprising visitor and Karen decides to spend the summer holiday in New Zealand. At the climax of Dan's numerous deceptions, someone sets the dealership on fire while he is still inside.
Lucas awaits Brooke's return to Tree Hill after a summer spent with Peyton. Peyton investigates the mysterious woman who claims to be her mother while Nathan must deal with Haley's reappearance at the same time as the fire at Scott Motors. Dan's fate after the fire is revealed.
Brooke organizes an "End of Summer Beach Party," but soon finds she's the only one in a party mood. Nathan comes home from High Flyers to reconnect with Haley, but he and Lucas are at each other's throats. Meanwhile, Lucas struggles with Brooke's new rules for dating, Peyton tries to come to terms with the new truths about her family, and Dan remembers what happened the night of the fire at his dealership.
It's the first day of senior year and estranged spouses Nathan and Haley have trouble adjusting as classmates. While Brooke continues to play hard-to-get, Lucas learns a troubling secret about Peyton's mom. Meanwhile, Dan closes in on the truth about the dealership fire.
It's party time in Tree Hill. A masquerade ball at Tric provides the perfect opportunity for Haley to win back Nathan's heart, and for Brooke to seduce Lucas. Punk-pop sensation "Fall Out Boy" performs amidst the costume madness, while Peyton tries to come to terms with the new mother in her life. Meanwhile, Dan gives Deb an ultimatum, but soon finds she's a much more worthy opponent than he thought.
It's Midnight Madness in Tree Hill as the Ravens officially begin basketball practice - with explosive results. New hoops captain Nathan clashes with Lucas over Haley. Brooke fills a vacancy on the cheerleading squad, only to regret her decision when the new girl, Rachel, sets her sights on Lucas. Meanwhile, Dan's bid for mayor takes a surprising turn when an unlikely opponent steps forward.
In an effort to keep her cheerleaders from fighting over the same guys, Brooke devises a "Fantasy Boy Draft." Haley and Peyton butt heads over Nathan, while Lucas has trouble keeping up with the brutal pace of basketball practice. Meanwhile, as the election nears, mayoral candidate Dan clashes with his new opponent.
As the fantasy draft dates begin, Brooke finds herself on an unusual double date, while Lucas gets closer to Rachel. Mouth spends time with an old friend and Peyton regrets choices she makes with Ellie. Karen and Deb take their campaigning to new heights.
As the town readies for the Ravens' first basketball game, Lucas worries that his head and heart aren't in it. Nathan accuses Lucas of being the Ravens' weak link. Peyton and Haley mend fences to support Brooke in a time of need. When the mayoral race tightens, Dan resorts to a smear campaign.
Lucas reveals that he knows who tried to kill Dan in the dealership fire. Brooke, Peyton and Haley find themselves behind bars. Chris Keller convinces Nathan to be his wingman at a high-stakes poker game. The residents of Tree Hill finally choose a mayor.
Lucas and Peyton take a road trip together to find Ellie. While out of town, Lucas reconnects with a friend from his past. Brooke, Haley and Mouth successfully launch the Clothes Over Bros website, only to find that demand far exceeds supply. Deb reveals to Nathan that she tried to kill Dan.
After losing their second game of the season, the Ravens receive tough love from Whitey. Peyton and Ellie try to recruit rock band Nada Surf for their benefit album. Haley reveals a disturbing fact to Nathan, and Brooke plans a romantic night for Lucas after learning that he submitted her fashion designs to a prestigious competition in New York and a familiar face returns to Tree Hill.
When a guidance counselor challenges the students of Tree Hill to consider their futures, Nathan and Lucas feel pressured to impress an important basketball scout. Mouth gets caught between Brooke and Rachel, Peyton and Ellie grow closer while finalizing their CD, and Dan tells Haley that Nathan paid Chris Keller to come back into her life.
A violent rainstorm knocks out the power in Tree Hill, leading Haley to Nathan's doorstep and Brooke out into the downpour for a dramatic confrontation with Lucas. Peyton finally confronts the truth about Ellie's illness, while Mouth is tempted by his new friend, Rachel. Before morning, secrets are revealed, relationships are tested, and new love gets hotter than ever.
Brooke is forced to grow up in a hurry when her trip to a New York City fashion show prevents her from attending an annual cheerleading tournament. Nathan and Lucas are influenced by the father of an old friend. Struggling with her birth mother's death, Peyton joins Rachel for a night of blowing off steam, and Haley and Nathan use their hotel room as the honeymoon suite they never had.
When someone unleashes the students' time capsule upon Tree Hill High, Lucas and Mouth must confront a person from their past. Brooke has to deal with the revelation that secrets aren't the only things she exposed in the time capsule. Dan learns to forgive Keith and Haley is forced to reconcile the man Nathan was before with the man he has become, and [Peyton's Breast Cancer Benefit Concert at Tric features performances by Haley, Jack's Mannequin and the return of Fall Out Boy.
The aftermath of the school shooting and the death of Jimmy and Keith forces everyone in Tree Hill to examine their lives. Nathan reassesses his relationship with Haley, while Brooke and Rachel join forces to heal the student body. Dan must deal with the ramifications of shooting Keith, while Lucas and Peyton consider the implications of their kiss in the library.
Rachel invites the gang to her family's cabin for a weekend getaway. Lucas, Brooke and Nathan conspire to surprise Haley while Peyton receives an unexpected visitor at the cabin. Mouth harbors resentment towards Rachel, and a game of "I Never" reveals a secret. Meanwhile, Karen confronts Dan about Keith's death.
Lucas struggles with the decision of whether he should play basketball in the wake of Keith's death while Brooke forces Rachel to deal with a dark secret. Nathan and Haley's wedding reprise is put to the test and Peyton decides to visit Pete in Chicago.
It's the weekend of the Coastal Classic, and with Lucas sidelined, Nathan has to step up on the court against an old rival who shows an interest in Haley. Brooke and Mouth plot revenge against Rachel while Dan goes head to head with Nathan's Uncle Cooper. Also, Peyton makes a life-altering decision.
On the eve of their wedding, Nathan worries for Haley's safety while Peyton and Brooke's friendship is tested by a shock confession. Deb tells Dan the truth about the dealership fire when she learns who he thinks was responsible, and Karen finds herself needing Keith more than ever when she makes a startling discovery.
In a shocking season opener, the aftermath of the post-wedding car accident unfolds. While Haley is deeply affected by Nathan's attempt to rescue Cooper and Rachel, Brooke confronts Lucas with her true feelings, and Peyton makes a startling discovery. Pressured by the fact that someone might know he killed his brother, Dan assaults Deb.
As Nathan, Rachel and Cooper's lives remain precarious following the car accident, Brooke celebrates her 18th birthday but finds it diminished by her struggles with Peyton. Lucas and Karen come to terms with her pregnancy and with the pregnancy of someone close to Lucas, while Deb's past addictions intersect with Haley in an explosive manner.
Lucas and Brooke, now broken up, clash at a post-game party and Haley realizes that Rachel is plotting to seduce Nathan. Meanwhile, Peyton connects with her half-brother, Rachel reveals that she knows who is pregnant and Skills takes the court with the Ravens basketball team.
Peyton introduces hip-hop sensation Lupe Fiasco at Tric, while rumors that Brooke is pregnant run rampant. Still dealing with their car accident, Nathan buys a motorcycle despite Haley's reservations, and Rachel poses for Maxim magazine. Meanwhile, Lucas clashes with Derek, and Deb double-crosses Karen.
When Lucas discovers that Derek's interest in Peyton is more than brotherly, Derek becomes menacing. Haley feels Nathan slipping away when he receives a scholarship offer to attend Duke University. As rumors of Brooke's pregnancy spread, Rachel uses the Internet to set Brooke up on a blind date with an older guy. At Nathan's request, Deb tries to kick her pill addiction.
Nathan and Haley's financial struggles force Nathan to approach Dan for help. In spite of his heart condition, Lucas decides to rejoin the Ravens, teaming him with Skills. Feeling isolated and alone, Peyton finds comfort from an unlikely source, while Brooke begins dating again, but discovers that her new boyfriend is not all that he seems to be. Mouth receives an unexpected proposal, and an old acquaintance of Dan's, Daunte shows a sudden interest in Nathan.
Brooke has her hands full with her model for the T.A.R.T. fashion show and a new boyfriend. Rachel makes the cover of "Maxim," causing chaos at Tree Hill High. Meanwhile, Lucas learns of Nathan's dealings with Daunte, and ultimately has to choose between Nathan and his love for basketball. Haley takes on a babysitting job only to find herself in over her head and Peyton's half-brother, Derek, forces her to confront her deepest fears.
Derek convinces Peyton to take a chance with Lucas at the same time that Brooke approaches him about getting back together. Daunte's] latest demand leads Nathan to seek help from an unlikely source - Dan. When Rachel learns of a failing grade, she turns to Haley for tutoring. Nathan is named MVP of the Ravens at the annual sports banquet.
As Whitey's last game approaches, the residents of Tree Hill feel the pressure of a looming State Championship. Peyton reveals to Lucas that she has feelings for him and Haley learns the sex of her baby. Nathan and Lucas clash over personal and team goals and Karen shows Deb tough love, while Dan tries to strike a bargain with Daunte.
Lucas receives an unlikely visitor -- his supposedly dead Uncle Keith. Haley's life and the life of her unborn child are threatened when she experiences serious complications with her pregnancy and Nathan wrestles with the guilt and consequences of his dealings with Daunte. Dan tries to make amends for Keith's murder and Peyton and Brooke try to patch up their differences.
Following his heart attack, Lucas returns to school, hoping to rekindle his romance with Peyton. Haley learns that Nathan was responsible for her accident. Brooke and Rachel hatch a plan to steal the next calculus exam, while Dan faces murder charges and Deb breaks out of rehab.
With senior prom only weeks away, Haley's frustration over her injuries increases and Skills and Mouth hatch a plan to help Nathan earn money for the big dance by stripping. Brooke betrays Rachel in order to get closer to a new guy and Peyton and Lucas resolve to be happy. Struggling with her drug addiction, Deb makes a choice that could end her life.
A class assignment reveals the deepest secrets and desires of Lucas and the students at Tree Hill High. Worried about college prospects, Skills turns to Haley, while Nathan wrestles with Deb's suicide attempt. Chase learns that Brooke cheated on her calculus exam, while nudity and drugs run rampant in the halls of the school.
Haley confronts Brooke regarding the stolen calculus test. Lucas and Peyton consider taking their relationship to the next level as Peyton and Brooke grow closer. In Deb's absence, Nathan throws a senior party at the Scott House, where a sex tape from Nathan's past surfaces.
On the day of Prom, the residue of Nathan's pre-Prom party has serious repercussions for everyone in Tree Hill. Haley asks Nathan for a list of his past sexual conquests. Rachel is suspended after taking the blame for the exam she stole with Brooke. Peyton tells Lucas she wants to skip the Prom entirely, but he refuses to take no for an answer. Finally Mouth and Brooke must deal with dating Clean Teens on Prom night.
It will be an unforgettable Prom at Tree Hill High when Lucas discovers who was in the hallway when Keith was killed. Meanwhile, Peyton's decision to skip Prom leads to dire consequences. Nathan and Haley vow to be romantic teenagers at Prom, while Dan tries to win Karen's affections, as the witness to his murder closes in.
The teens of Tree Hill mount a rescue mission to retrieve Mouth from his ill-advised road trip with Rachel. While on the trip, Haley and Nathan get a second chance to enjoy the prom, and Lucas and Peyton decide to take their relationship to the next level. Brooke tells Haley that she lied about stealing the calculus exam, and Nathan struggles with the residue of a past mistake.
Nathan fears for his future as past mistakes come back to haunt him and Haley. Lucas hears a shocking confession after making contact with the mysterious witness to Keith's murder. Brooke rekindles her friendship with Peyton after crossing paths with Chase.
Nathan and Haley grow closer in spite of the recent scandal and Brooke wonders if a spark might be rekindled with Chase. Peyton receives a tempting offer that would ultimately take her away from Tree Hill. Mouth reconnects with Gigi, while Lucas tells Karen that Dan is a murderer, setting off an explosive series of events.
As graduation day dawns in Tree Hill, some dreams begin as others end. Haley prepares for her graduation speech and her role as a young mother, while Nathan prepares for life without basketball. Brooke makes a heartfelt confession that puts her future in jeopardy and Lucas confronts Dan as Karen's life is threatened.
Dan must face the harsh consequences of his decision to murder Keith as Karen and Haley's pregnancies complicate the lives of Nathan and the graduating seniors of Tree Hill High. Lucas wrestles with his post-high school options, and Peyton and Brooke prepare to spend the summer in Los Angeles together.
Four years after the season four finale, Tree Hill is a new place. Lucas is a struggling writer who is about to embark on a new coaching career with Skills. Peyton is at the beginning of a budding music venture, while Brooke's fashion line is at a crossroads. Meanwhile, Nathan and Haley are young parents trying to find their way. Much has changed in four years, but in many ways, the journey is just beginning.
Tensions run high as Lucas must face his past and choose his future, while he discovers the demands of being the coach of the Tree Hill Ravens. Haley's decision to hire a nanny brings much-needed help into their home, while her first day of teaching turns out differently from what she expects. Jamie sets his sights on a Soap Box derby race and enlists Skills to help him out. Meanwhile, Mouth's excitement about his new job is tempered by his demanding new boss.
Lucas' editor wonders about the timing of his recent creative inspiration. Brooke and Peyton make business plans, while Mouth tries to win points with his boss Alice. Lucas and Skills finally make some headway with the Ravens, while Nathan tries to wrestle free from Dan's legacy.
As Brooke makes plans for Clothes Over Bros, Peyton has her hands full when the musician she just signed turns out to be problematic. Haley's interest in music leads her back to the recording studio and Nathan's efforts to corral defiant player Quentin are unsuccessful. Meanwhile, Mouth's relationship with his boss grows heated.
In an episode set three years in the past, Lucas visits Peyton in Los Angeles with an offer that will change their relationship forever and, under pressure from Victoria, Brooke must make a difficult decision about the future of her clothing line. Whitey is concerned when Nathan's temper flares on the night of the college basketball championship and Haley struggles to balance the pressures of school and being a new mom.
It's a Tree Hill reunion as the entire gang gathers at Tric to see The Honorary Title perform. While Peyton and Haley see this as an opportunity to introduce their musical act Mia, Carrie sees it as a chance to get closer to Nathan. Brooke forces an unsuspecting Mouth to go on a blind date with Millicent. Lindsey confronts Lucas about sneaking off to see Peyton.
Peyton admits her true feelings to Lucas. Brookemakes a play for Owen and Mouthtries to convince Millicent he's a better man than she thinks he is. Haley wrestles with whether or not to reveal information that could ruin Lucas' relationship, and Nathan is put in a position that could spell the end of his marriage. Lucas and Skills face the coaching prospect of playing their season opener at a disadvantage.
At the first Raven's basketball game of the season, Haley, Brooke, Peyton, Lindsey and Mia find themselves locked in the Tree Hill High library. Tensions run high as Peyton and Lindsey face off over Lucas. Brooke tries to stand up for her mother when her friends go on the attack. Haley plays mentor to Mia, who is experiencing the elation and disappointment of fame. Meanwhile, Mouth, who is covering the game as his first official TV reporting assignment, struggles to find a story. Finally, Lucas and Nathan grapple with the decision to tell their loved ones about various indiscretions.
When Brooke takes Owen to New York for a glimpse of her other life, she's faced with a ghost from her past. Haley reels from a devastating blow to her marriage, while Nathan and Lucas muster their courage to attend Dan's parole hearing. A major record label takes an interest in Peyton's recording artist Mia.
On the very special 100th episode of "One Tree Hill," it's Lucas and Lindsey's wedding day and Peyton must choose whether to intervene or lose her true love forever. Nathan uses the occasion to attempt a reconciliation with Haley, and the recently paroled Dan shows up for the family reunion.
Lucas picks up the pieces after being left at the altar by Lindsey, while Nathan and Haley deal with the repercussions of Jamie's abduction. Brooke is haunted by her past as she considers adopting, while Peyton gets a visit from an old friend.
Lucas and Peyton discuss Lucas' aborted wedding, while Brooke gets a phone call that could change her life, and Millicent and Mouth take a new step in their relationship. Haley takes the first tentative steps towards a new career, and Nathan contemplates what it would take to get his game back.
Lindsey returns to Tree Hill for Jamie's fifth birthday party, giving Lucas hope for their relationship. Brooke and Peyton prepare for life with a new baby. Meanwhile, Dan tries to insinuate himself back into the lives of his family, ultimately divulging a grave secret to Nathan and Haley.
Lucas investigates Dan's heart condition while Haley struggles with letting Dan into Jamie's life. Nathan urges Quentin to reinvent his game and Brooke juggles her career with life as a new mother. Peyton tries to assuage her guilt over Lucas' breakup, and Mouth gets a shot to be sports anchor.
Lucas is crushed by devastating news, while Brooke's baby undergoes emergency surgery. Haley wrestles with her decision to record a new album. Skills and Nathan employ a risky game plan to salvage the Raven's season and Lucas stuns Peyton with a shocking truth.
Brooke deals with giving up her baby, while Lucas deals with the residue of his actions following his game night scuffle. Haley has a musical breakthrough and Peyton gets news about a ghost from her past. Nathan and Jamie face their fears together.
After Lucas and his fiancée enjoy planning their dream wedding, Brooke and Peyton reconnect. Nathan works with Quentin on his basketball skills, but Haley is worried for Nathan's well-being and reeling from a threat to her store, Brooke reaches out to an unexpected ally. Jamie catches Skills and Deb kissing.
Lucas struggles to inspire the Ravens, while Haley investigates the disappearance of Dan. Brooke confronts an old demon from her past, as Nathan comes to terms with Deb's relationship with Skills. Peyton is surprised when a famous musician visits her studio.
When Lucas begins his book tour, he is joined by a familiar face. Nathan is given an opportunity to play basketball again, which forces him to question his health and Haley tries to help a student in need. Brooke considers a life-changing proposition while Peyton and Mick have a confrontation over his identity.
Nathan and Haley must parent Jamie in the face of a school bully, while Lucas and Peyton adjust to life as a live-in couple. Brooke finds being a role model not as easy as she expected, and Mouth tries to get his old job back.
Lucas’ novel receives unexpected and surprising interest, as does Mouth from his new intern. Jamie grows enamored of Sam and her rebellious facade, while a would-be suitor grows enamored of Brooke. Meanwhile, Haley counsels Nathan as his basketball comeback gains momentum.
The past comes home to roost as the residue of deception, anger and romantic mistrust permeates the lives of several Tree Hill residents. Nathan finds himself face-to-face with an old rival, Brooke deals with someone who once hurt her, and Lucas’s novel leads him into unchartered and threatening waters.
On the day of Peyton's USO Concert, Haley battles stage fright and Nathan struggles with a decision that could change his career. Brooke gets a call that threatens her relationship with Sam and Millicent confronts Mouth on his relationship with Gigi. Angels and Airwaves make a guest appearance.
As Lucas takes a trip to Hollywood to meet his film director, Nathan gets a pro basketball try-out. Peyton struggles with Mia to focus on her follow-up album, while Millicent confronts Mouth about Gigi. Julian approaches a dubious Brooke about designing clothes for his movie, and Haley takes a reluctant Jamie to his school talent show.
Peyton receives some startling news that she must share with Lucas who, while still in LA, discovers that Julian has been keeping another secret regarding the movie. Nathan struggles in a new professional environment, and Brooke's search for runaway Sam forces her to confront her own feelings about the night of her attack.
Lucas and Julian struggle to choose a director for their movie while Peyton has mixed feelings about a surprise gift from Lucas. Brooke struggles with issues about her relationship with Julian and Mia finally feels inspired by Chase.
Lucas wrestles with casting for his movie while Peyton tries to prepare for their future. Dan advises Jamie on a school crush. Brooke meets the actress who will play her while Nathan gets exciting news, and Haley has to make a tough decision at school.
Peyton and Lucas receive a startling surprise about the pregnancy, as Brooke and Julian's relationship comes to a crossroads. Nathan and Haley celebrate their anniversary, while Dan and Deb babysit Jamie. Meanwhile, Mouth and Millie try to pick up the pieces of their relationship.
Julian makes Brooke a startling offer. Lucas brings Nathan and Jamie to an important place from his past, while Peyton prepares for the future. Sam and Jack take a stand against the principal who fired Haley. Skills takes Mouth on a road trip to get his mind off Millie.
Brooke discovers something that could change Sam’s life. Nathan questions his dreams of playing in the NBA while Haley receives an unexpected offer from Nick Lachey. Jamie and Skills mend their broken hearts at Jamie’s first school dance and Lucas and Peyton remember a memorable road trip they took together after High School.
Nathan learns of a shocking accusation that could threaten his career, much to the chagrin of his sports agent Clay. Brooke prepares to launch a new fashion line, and Julian decides to produce a big movie. Haley sister Quinn makes a surprise visit. Meanwhile, Jamie celebrates his 7th birthday.
While in the process of recording her new album, Haley battles to protect Red Bedroom Records with the help of Mia. Brooke casts the new face of her clothing line, and Clay defends Nathan against a growing scandal. Julian and Brooke decide to move in together while Dan unveils his new bride.
Clay and Nathan disagree on how to handle an ever-worsening scandal, and Haley begins to wonder if Renee's accusations have merit. Quinn and Brooke organize a photo shoot, and Mouth ups the stakes in his battle with Skills. Meanwhile, Alex makes Julian an interesting proposition.
Nathan's scandal becomes public. Brooke's fashion show brings an unexpected responsibility for Millicent and Haley convinces Quinn to talk to her estranged husband David. Meanwhile, Mouth makes a decision that could threaten his career.
Haley is thrust into the spotlight and storm of Nathan's growing scandal. Against her better judgement, Brooke allows Julian to continue working with Alex while Millicent gets a new job, which may cause trouble for Mouth. Meanwhile, Clay and Quinn grow closer.
Haley considers taking matters into her own hands as Nathan's scandal threatens his endorsement deals. Julian gives Alex another chance, and Brooke reconnects with Chase. Millicent questions whether she has what it takes to be a model while Clay lets Quinn in on a big secret.
Dan brings Renee onto his television show, leaving Nathan and Haley powerless to stop him from revealing the truth of her pregnancy to the world. Quinn examines what went wrong with David, and Sara and Clay discuss their past. Meanwhile, Brooke comes clean with Julian about her true desires.
Julian agrees to a weekend camping trip but struggles to fit in with Nathan and the guys. Back in Tree Hill, Brooke and Haley spend Girl's Night doing a little bonding of their own, and Quinn helps Clay come to terms with a tragic loss. Meanwhile, Dan and Rachel's past catches up to them.
Haley returns to the stage and Brooke receives life-changing news. Meanwhile, Dan Scott returns to Tree Hill much to the chagrin of Nathan, who is about to sign a new NBA contract with the help of his agent Clay.
Nathan and Haley's careers bring about a tough decision for the family, and Julian divulges a secret to Alex that leads to a confrontation with Brooke. Meanwhile, Clay tries to resuscitate his career as an agent, and Jamie learns the truth about Skills' new job. And a fresh-from-jail Millie finds an unlikely supporter in Victoria.
The Scott family joins Haley on the last leg of her tour, while Brooke and Julian reconnect after their six-week break. Clay and Quinn try to figure out how to move forward after his public declaration of love, and a post-rehab Alex tries to make amends with herself and the people she's let down.
Nathan tries to keep Haley calm after Taylor shows up at their house with Quinn's ex-husband in tow. Julian sticks up for Alex on the set of their movie, and Brooke leans on Alexander to ease her heartache. Meanwhile, Clay gets a chance to prove his commitment to Quinn by helping her through a dinner with her sister and David.
In the chaos surrounding an '80's alumni dance at the high school, Haley's birthday is forgotten, Jamie is left home alone, and Nathan and Clay are stranded 200 miles from Tree Hill. Meanwhile, Brooke's appearance at the dance with Alexander forces Julian to relive his dorky adolescence in an episode dedicated to the memory of John Hughes.
Brooke and Julian try to find a balance between their personal lives and work as the movie shoot begins. Nathan and Haley receive a surprise visit, and Clay supports Quinn as she faces some unexpected news. Alex sets her sights on Alexander, and Millicent finds herself struggling with temptation
Nathan tries to help Haley and Jamie confront Lydia's seemingly hopeless situation, while Brooke and Julian navigate their volatile relationship in the midst of a hectic movie shoot. Meanwhile, Clay and Quinn spend some time apart, and Miranda tries to prove to Grubbs that she's the right person to produce his album.
As Brooke deals with the mounting financial troubles at Clothes Over Bros, Nathan and Haley come to a conclusion regarding Nathan's career. Meanwhile, Julian begins a new film project, while Alex and Chase spend the afternoon together.
As Clay is discharged from the hospital, Nathan contemplates walking away from the NBA. Meanwhile, Brooke and Victoria disagree on how to handle the company's financial problems, and Chase discovers a secret about Alex.
As Halloween approaches in Tree Hill, Brooke and Julian get an unexpected visitor, and Nathan begins a new career. Meanwhile, Clay and Quinn struggle with life back at the beach house, and Haley and Mia host an open mic night at Tric.
As the wedding approaches, Brooke tries to connect with Sylvia , while Julian looks for his best man at a guys' poker night. Meanwhile, Nathan struggles in his new job, while Haley's counseling abilities are challenged, and Skills returns to town with a new friend.
Nathan's career as an agent takes a big step forward when he visits Atlanta, while Haley consoles Jamie regarding his new braces. The drama between Brooke and Sylvia finally comes to a head, and Chase makes a decision regarding Mia and Alex.
As the girls plan a surprise baby shower for Haley, the guys participate in try-outs for Jamie's baseball team. Meanwhile, Brooke and Julian pursue adoption, while Mouth gets Millicent ready for her first day at work.
As Haley's due date approaches, she takes steps to ensure that all her friends and family will be ready when the time comes. Brooke and Julian also prepare to begin a family, while Chuck turns to Chase for help with a problem.
As Nathan, Julian and Clay coach Jamie's first little league game, the situation regarding the accident comes to a head. Meanwhile, Chase asks Alex to take a drug test for him, and Quinn gets an offer to shoot in Puerto Rico.
As Brooke and Haley prepare to re-open Karen’s Cafe, Nathan and Clay hit the road looking for new prospective clients. Meanwhile, Chase leaves for the Air Force leaving behind a disappointed Alex and Chuck, and Mouth and Millicent begin their new morning show together
As Brooke and Julian begin to adjust to life with their newchildren, Haley and Nathan find themselves dealing with similar issues. Although they don’t know it yet, faces from the past threaten to interrupt plans for all their futures. Meanwhile, a mysterious problem arises for Clay and Quinn.
Dan helps a struggling Haley at Karen's Café. Meanwhile, Quinn discovers that Clay is hiding something from her, and Chase tries to mend a broken heart. Brooke is let down by her lunch plans with her dad, and Julian makes a life-changing mistake.
Nathan is missing and Haley fears the worst - As Quinn distracts Jamie, Haley searches for Nathan. Clay finally gets answers about his condition. Meanwhile, Julian attempts to get back to a normal life, while Brooke tries to give Tara a chance.
Haley seeks help from Lucas as Nathan makes an escape attempt. Brooke comes face-to-face with Xavier. Julian uncovers evidence that assists Dan in his search for Nathan. Clay makes a connection with another patient.
As Haley prepares to emcee the annual Tree Hill Burning Boat Festival, Brooke uses the opportunity to process her father’s betrayal, while Julian tries to breathe new life into a past idea. Mouth and Millie make a change to their morning show, and Clay and Quinn get ready for Logan’s first night at the beach house.