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.

Dan presents the Ravens opening show for the new basketball season, but after the choreographed cheerleaders the boys come rolling in with a public fight between Lucas and Nathan over Haley; then a major flashback... Brooke and Peyton audition would be-cheerleaders; the obvious winner is arrogant, slutty Rachel, who Brooke accidentally indicates when telling Lucas to date another girl. While Dans team plans his mayoral election campaign, Deb deliberately walks in dressed sluttier then a drunk whore. Captain Nathan puts Lucas on the bench for back-talk. Brooke wants to field Haley instead of Rachel. Coach grudgingly introduces Dan and smiling, to everyone's surprise, his late-hour mayoral opponent: Karen Roe! When Dan announces the team, Lucas calling Nathan 'just like' his dad starts their fight, and Brooke attacks Rachel. Coach is livid at the brothers- and makes Lucas co-captain. Rachel sits naked in Lucas's car, and Brooke chews both of them, to his surprise admitting she only wanted to be desired exclusively by proclaiming non-exclusiveness.

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 practise. 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. Meanwhile, Karen and Deb take their campaigning to new heights.

After Lucas surprised Chris with Brooke, even her self-confidence isn't enough to remain assured she hasn't really lost the possible love of her life. Chris informs Nathan whom he thought already knew and gets knocked for once more breaking up a relationship for someone he's not even truly in love with. Dan phones the radio station to point out on air his competitor Karen is unmarried and checks on Nathans condition for the new season, but gets the cold shoulder. Tim looks forward to the boys getting tattoos this year. Karen nor cake can cheer up Lucas, who doesn't even feel like basketball anymore; Nathans advice in the locker-room to concentrate on his playing and forgive Brooke for love's sake don't help either. Coach tells the team he'll retire after this season, and expects them, his best team ever, to prove so by results; Lucas stinks worst of all at the first game, which is an utter loss. Haley and Nathan are back on speaking terms. Mouth shows 'mayor' Karen his cell-phone recording of Dan roughing up Nathan and coach throwing him out after the match.

Lucas and Peyton take a road trip together to find Ellie. While out of town, Lucas reconnects with a friend from his past.

Another terrible Ravens game; coach blames everything on total lack of team spirit. Keith is back, admitting to Lucas his fiancé Jules was not what he hoped, and just no match for Karen. Brooke must take the couch at Nathans place, but gets invited for Rogue Vogue, a fashion talent show in New York. Nathan fears Dan was right to suggest Haleys sudden lack of birth control is all too convenient. Coach punishes the boys by transferring them from the glorious stadium to a dump which they must first clean up; Nathan walks out, but after talking to Lucas and Dan about his chances for a scholarship etc. returns. Keith laughs at Dan's promise to prove he's the arsonist, but tells Karen he had intended to kill his brother but was beaten to it by Deb and helped her flee. Lucas shows Nathan the tactical advantages of studying the flaws in the old court. Karen warns Lucas to be careful with Brooke in every respect. Brooke finds out gratefully her design work was entered by- Rachel! Karen kisses Keith, but he is arrested for the murder attempt on Dan before her eyes...

Keith is arrested as suspect for the arson attempt on his brother Dan, but to the mayors anger soon released for lack of proof. The kids are supposed to get counseling about choosing a college, but nearly all have their minds elsewhere. Nathan and Haley make up, but have chosen colleges 3000 miles apart. Brooke believes Rachel deliberately entered her for the New York fashion contest because it's the same day as the cheerleaders' high-day, the Classic. Ellie insists Peyton shouldn't doubt about going to college at all. Mouth has enough of Brookes bitching, so he goes to the game with Rachel. Because Nathan missed political science class now Dan teaches that course, coach benches him, just when the major East Coast talent scout is present; still he gives Lucas the winning tactical tip, which really impresses coach...

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 Marvin is tempted by his new friend, Rachel. Before morning, secrets are revealed, relationships are tested, and new love gets hotter than ever.

It's the weekend of the Classic in Charlotte for the Ravens and their cheerleaders. Haley and Peyton go on a road trip with Brooke to New York for the Rogue Vogue fashion show before hopping on a plane to Charlotte in time for the secret sparkle classic cheer competition. A schedule change in New York though means Brooke has a big decision to make. Rachel does everything she can to mess with Brooke and Coach Durham interferes with chaperones Karen and Keith's weekend.

Last year's time-capsule is maliciously opened 49 years early, revealing many kids' embarrassing secrets, lies and even worse truths, shown on TV screens at school and even on the Internet. Peyton prepares a benefit for the National Breast-cancer action, in memory of her recently deceased ma Ellie Harp; it rocks and brings most kids back together. Keith announces his engagement to Karen and his plan to adopt Lucas. Jimmy Edwards, who bagged the worst on everyone in his time-capsule speech, gets roughed up, but the Scott brothers, Mouth and Rachel save his bacon. Dan reminds Keith how close they were as boys and hands him the black ledger but is scorned and burns it. Nathan and Haley enjoy closeness again. Lucas embraces Keith as his future father, without step-.

A dangerous day at Tree Hill High gives Nathan and Lucas a common goal, as they put their lives on the line to save their friends when a distraught student comes to school with a gun and holds Haley hostage.

The aftermath of the school shooting and the death of Jimmy Edwards 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 for a weekend getaway at her family's cabin. Craziness will ensue, including a game of "I Never" which will cause characters to do things they normally wouldn't, and a nasty little issue Mouth has been harboring toward Rachel will surface. Meanwhile, Karen will confront Dan about Keith's death. Could she suspect the truth?

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 night before Nathan and Haleys wedding, Brooke argues with Haley over the wedding dress. Meanwhile, Lucas and Karen return.

Nathan and Haley's wedding is a time of great joy. And great sadness. Peyton and Brooke fall out, Dan learns the truth about the fire, and Rachel gets publicly drunk....and publicly bitter.

The aftermath of the post-wedding car accident unfolds. 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.

Peyton finally realizes that her brother Derek isn't her real brother but in fact the very same person that's been sending her online messages using the alias "watchmewatchyou". When she learns this and starts pushing him away, Derek breaks into her house and tries to hurt her. She is saved in the last minute by her real brother Derek and Lucas. In the end, Derek disappears after surviving a bad fall through Peyton's window.

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. Haley learns the sex of her baby. Nathan and Lucas clash over personal and team goals. 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.

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 Marvin 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.

Peyton is scared by images of "Psycho Derek," so she decides to confront him. Meanwhile, Lucas continues seeking answers about his Uncle Keith's Murder.

Nathan and Haley grow closer in spite of the recent scandal. 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. 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.

Brooke invites Tric bartender Owen to come and see her business in New York but finds model Rachel, a friend from her past, in her apartment having taken an overdose. With Owen's help they manage to persuade her to enter a treatment program. Nathan and Lucas attend Dan's parole hearing while they try to protect Jamie from him. Mia gets an offer from Peyton's former employer. Elsewhere, Haley and Nathan's marriage is on the rocks as Carrie does her damnedest to split them up leading. Jamie falls into the pool.

Missing Nathan gives Jamie nightmares about Dan, who is indeed paroled. Lucas and Lindsay decide to 'coincidentally' have separate stag and hen nights at the same place, so Nathan and Haley are bound to meet. Brooke arranges a hot blind date for Peyton, but the joke is on her as Owen's chosen mate is Chase, Brooke's former 'clean teen' lover. Jamie's tireless efforts to get his mom and dad to make up In turn make Haley realize she shouldn't have tried to change Nathan. Ruthless business adviser and absent mother Victoria pushes Rachel out, to Brooke's disgust.

Brooke looks for a model as the new face of Clothes Over Bros. Mia and Haley fall short of selling a million records. Dan finds a confidant in an unlikely person. Nathan deals with being distant from the ones he loves, while Clayton reminds him he's in the NBA. Tree Hill's former bad girl - Rachel Gatina returns.

Nathan and Haley have to decide what to do about Renee's pregnancy claims as Clay thinks paying her off is the best way as it is Nathan's contract year. Mouth is asked by his station manager to investigate any titillating scandal about Nathan but decides not to tell his boss about the alleged pregnancy. Mouth and Skills come to an agreement about living together and Alex tests the patience of Millicent during a photo-shoot. Later she gives Julian a film script. Meanwhile, Quinn's husband David comes to find her when she won't answer his calls.

Renee presses charges and has Haley arrested and thrown in Jail. Clay and Quinn grow close much to Nathan's distaste. Elsewhere, after a false start Julian and Alex begin to work on her script.

Julian gives Alex another chance and they continue to work on her script which he believes is very good but Brooke is not happy. Brooke reconnects with Chase to make Julian jealous and it works. Mouth gets to tell the truth on air about the allegations against Nathan much to his station manager's horror. Milicent begins to take weight loss tablets after Alex tells her she is a plus-size model. Elsewhere, Haley offers to pay off Renee unknown to her that Rachel and Dan have got to her first.

Dan and Rachel bring Renee onto his chat show. But does Dan have a few tricks up his sleeve? Meanwhile, Clay and Quinn reflect over their past loves - Clay and his late wife Sarah and Quinn and her earlier life with David.

Nathan, Julian, Mouth, Skills, James and Chuck go camping. Back in Tree Hill, Haley, Brooke and Quinn enjoy some "special" brownies. Meanwhile, Clayton continues to deal with his mourning issues and Dan has nightmares about a dying boy.

Haley returns to the stage much to Miranda's annoyance but the gig turns out to be a success and changes Miranda's attitude somewhat. Brooke believes she might be pregnant but is conflicted on how Julian will take the news - but the test proves negative. Julian finishes the script with Alex and heads out to be with Brooke at Haley's gig but gets a call from Alex telling him she's close to taking cocaine again so he goes to her much to Brooke's annoyance. Rachel and Dan arrive back in Tree Hill but his hoped reconciliation with Nathan doesn't materialize. But Dan isn't going anywhere. Mouth meets Rachel and tells her to try and reconcile her differences with Brooke but Brooke isn't having it. Mouth and Brooke are both concerned and angry with Millicent who's desperation to be liked by the public is putting her in a downward spiral. Elsewhere, Clay's hardball tactics with the Charlotte Bobcats and Nathan's contract fail when they sign another player to fill Nathan's spot. What will Nathan do now?

After losing his place on the Charlotte Bobcats Nathan reaches breaking point with Clay and fires him but this ends up causing a rift between Haley and Quinn with Quinn moving out to a hotel. Dan takes it badly that Clay messed up and tries to teach him a lesson by nearly drowning him in the surf. Later Clay is fired by his boss for stuffing up Nathan's contract. Victoria arrives unannounced and takes a liking to new TRIC bar manager Grubbs. Meanwhile, Brooke tells Julian that it is doubtful that she will ever be able to get pregnant and he promises to get different opinions and they will work it out. Elsewhere, Millicent's increased drug taking alarms Mouth and her model like tendencies and demands disgust Brooke. It prompts Victoria to call the police when she sees Millicent driving drunk. Millicent calls Brooke from jail but Brooke tells her she cannot help her.

Victoria bails Millicent out of jail the morning after her arrest and tells her to get herself together before she shows herself again. But Victoria is doubtful that Millicent has learned her lesson and proceeds to keep an eye on her and she is proved correct when Millicent steals a dress from Brooke's new collection to give to her model friend Makenna is exchange for a packet of blow. Mouth is distraught at the change in Millicent and they break up. Clay tries in vain to hold onto his one client but it is not to be and so he packs up his apartment much to Quinn's dismay. Nathan is told by his agents that he won't play NBA this season and his only option is to play in Spain and be ready for the next season but this move coincides with Haley's planned record tour of the US. Skills records a video with the help of Jamie for a new job in L.A. Elsewhere, Julian mistakenly tells Alex that Brooke cannot have children which further deepens the rift between Brooke and Julian after Alex tries in her own way to help Brooke. Despondent after being told to stay away from Julian Alex slits her wrists in the bath and leaves Julian a voice-mail telling him she won't bother him anymore.

Clay gets his mojo back with some help from Quinn and which might mean that Nathan can stay in the US and play in the NBA with the his old team the Charlotte Bobcats instead of going to Spain. Skills gets offered and takes the job in Los Angeles and brings Mouth along for the ride. Dan goes against Rachel on his television show and tells his audience that this is his last show and also serves with divorce papers. Julian rescues Alex from her near suicide bid and tells her the film deal is back on. Brooke fires Millicent from her model contract and tells her to get immediate help for her drug problem but her stay in rehab is brief. Victoria hires a new designer, Alexander Coin, for the menswear collection without telling Brooke.

The big day has finally arrived and the gang gathers at the hospital to await the birth of Haley and Nathan's baby. While they wait, they reminisce about the memories they have shared over the years.

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.

Dan presents the Ravens opening show for the new basketball season, but after the choreographed cheerleaders the boys come rolling in with a public fight between Lucas and Nathan over Haley; then a major flashback... Brooke and Peyton audition would be-cheerleaders; the obvious winner is arrogant, slutty Rachel, who Brooke accidentally indicates when telling Lucas to date another girl. While Dans team plans his mayoral election campaign, Deb deliberately walks in dressed sluttier then a drunk whore. Captain Nathan puts Lucas on the bench for back-talk. Brooke wants to field Haley instead of Rachel. Coach grudgingly introduces Dan and smiling, to everyone's surprise, his late-hour mayoral opponent: Karen Roe! When Dan announces the team, Lucas calling Nathan 'just like' his dad starts their fight, and Brooke attacks Rachel. Coach is livid at the brothers- and makes Lucas co-captain. Rachel sits naked in Lucas's car, and Brooke chews both of them, to his surprise admitting she only wanted to be desired exclusively by proclaiming non-exclusiveness.

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.

Brooke invites Tric bartender Owen to come and see her business in New York but finds model Rachel, a friend from her past, in her apartment having taken an overdose. With Owen's help they manage to persuade her to enter a treatment program. Nathan and Lucas attend Dan's parole hearing while they try to protect Jamie from him. Mia gets an offer from Peyton's former employer. Elsewhere, Haley and Nathan's marriage is on the rocks as Carrie does her damnedest to split them up leading. Jamie falls into the pool.

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.

Rachel invites the gang for a weekend getaway at her family's cabin. Craziness will ensue, including a game of "I Never" which will cause characters to do things they normally wouldn't, and a nasty little issue Mouth has been harboring toward Rachel will surface. Meanwhile, Karen will confront Dan about Keith's death. Could she suspect the truth?

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.

The aftermath of the post-wedding car accident unfolds. 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.

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.