As promised, Lucas, Brooke, Nathan, Haley, Peyton and their Tree Hill gang meet up after 4 years of being apart. Haley and Nathan still live in Tree Hill with their now 4 year-old son, James Lucas Scott. Nathan's dreams of being a NBA star were smashed. Peyton has just quit her job in the record industry. Brooke is living in New York. Her multi-million dollar clothing line, Clothes Over Bros, has given her a successful career in fashion design. Lucas comes back Tree Hill with his new girlfriend, Lindsay, suffering writer's block. The group rekindles to see how much their lives have changed since the simple years of high school

Brooke buys Karens Cafe, and turns it into a Clothes Over Bro's boutique. Everyone goes to the opening of the store, including Brooke's Manager mother, who has seemed to track her down. Lucas and Peyton cause friction at the opening.

Nurse Carrie isn't just an ideal playmate for Jamie, who has nightmares since Skillz told him too much about Dan. Her charms should make Haley jealous, but she doesn't realize yet that Carrie really lusts for the hunky husband. Mouth is deputized by the night-shift to ask for better working conditions from their boss Alice; he actually may earn a TV reporter spot as her "play thing". Peyton clashes instantly with Brooke's bossy mother, Victoria, who scares her new label's only star, Mia, and calls Brooke too dumb to run the fashion business herself. Lucas considers proposing to Lindsay and won't accept Peyton's claim that he 'gave up on their true love' during or after his 'ambush proposal'.

It's a Tree Hill reunion as the entire gang gathers at Tric to see musical group The Honorary Title perform. Victoria turns up at the club which infuriates Brooke. Meanwhile, Brooke sets up her assistant Millicent with Mouth but Alice ruins the set-up for him by threatening to have him fired if he kisses Millicent. Peyton arranges for Mia to sing at Tric and Lucas proposes to Lindsay which stuns Peyton.

Lucas proposes to Lindsey and Peyton is the first one to know the news. Haley is upset at Lucas and Peyton for witnessing their kiss before he proposed to Lindsey. Next day Lindsey shows her ring to Haley and Brooke. Mouth finds out that Alice has been fired for sleeping with an unnamed employee and continues to pursue Millicent and finally wins her over when they watch a televised ballet recital. Carrie continues in the pursuit of Nathan and Brooke is intrigued by Owen and wants to get to know him better but cannot understand why he doesn't respond to the instant Brooke charm.

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.

Lindsay's big day, the wedding to Lucas, has finally arrived. The old gang reunites, remembering their own loves and/or marriages, even Karen and Andy from New Zealand. Haley still isn't ready to let Nathan back. At the altar Lindsay finally realizes the Comet in Lucas' book refers to Peyton's car and their first love, and runs out. Crazy Carrie kidnaps Jamie, pretending she was rehired as his nanny. Because Haley saw Dan and refused him entry, Nathan sends the police look for his dad. In fact Dan followed Carrie and finds his grandson.

The marriage counselor's advice to reconnect with personal aspirations is followed to the letter. Haley is happy to re-enter the music field; Peyton is to sign her up for a record. Haley can't find an appropriate nanny, apart from Nathan's mother Deb. Nathan's come-back in basketball is harder to get going as the team's stupid star Q is rude and hostile. Only Jamie get's on with Dan, the brothers warn him to keep his distance. Brooke is ecstatic to be 'getting a baby', so she stocks up on toys etc.

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 confronts Dan's announcement about his life expectancy of only 6 months without a heart transplant. He calls Dan a liar until the cardiologist confirms it. Nathan wrestles with his feelings, and Jamie's burning desire to get acquainted with his 'cool' grandfather, while Dan begs for a last chance to repair his shattered family. Nathan and Jamie come up with a daring alternative for the injured Ravens. Mouth suddenly gets a triple break as sports presenter.

Brooke has to deal with giving up her baby Angie. Haley's career takes a turn for the better and Peyton is visited by somebody from her past. Meanwhile, Dan awaits a new heart as Lucas makes a decision on who he wants to be with. Elsewhere Mouth makes the decision to move to Omaha when Millicent agrees to go with him.

The girl of Lucas' dreams shows up at the airport. Nathan's comeback is halted by news that could change his career, while Dan's life hangs in the balance. Marvin and Millicent wrestle with leaving Tree Hill, as Brooke and Victoria's battle over Clothes Over Bros comes to a surprising head.

After Lucas and his Peyton 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 Antwon and Deb kissing.

Lucas returns from Las Vegas and learns of the tragic death of Quentin Fields, as Nathan and Haley struggle to find a way to help Jamie understand the death of Quentin who was a close friend of theirs. Lucas, Skills, Nathan, Haley, and Peyton go to visit Quentin's mom and give their sympathies. Jamie meets Quentin's brother, Andre.

Knowing about his mother's affair with Skills, Nathan tells her to leave, but finds Jamie and his granny miss each-other. Of all people she happens to tell crazy Carrie. Jamie's insistence to visit grandpa Dan brings Haley to discover his disappearance and investigates. Brooke seeks counseling now that her mother has stolen her fashion company, then goes to confront her, armed. The shoplifter is in Haley's class. Peyton is delighted to work and spend time with singer Mick Wolf, who also knew her late mother and biological father.

Nathan thinks it's a godsend to be invited for a job interview by manager Bobby Irons of the NBA D-league team Fort Wayne, until he hears it's for a coaching job. Haley finally grants Jamie a last chance to say dying grandpa Dan goodbye, but it's a dangerous set-up by crazy nanny Carrie, which only lush granny-nanny Debby works out. An incompatible date in a promotion tour for his book forces Lucas to tell Lindsay he's about to marry Peyton.

Lucas is joined by a familiar face on his book tour; Nathan questions his health when he is given an opportunity to play basketball again.

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 Marvin gets his old job back. Marvin is surprised to find out that his new intern is someone from his past.

Lucas' novel receives unexpected and surprising interest, as does Marvin 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.

Jamie and Haley really worry that Nathan might being injured at Slam Ball, although he scores well and Owen protects him even against the most feared adversaries. Brooke is so stressed out by Sam's misbehavior that Owen's efforts to win her back, exposing himself only to get overexposed cruelly, seem wasted. Lucas agonizes over whether and how to write the key script scene Julian demands, Keith's death. Peyton puts off telling him about her LA affair too long.

Nathan wrestles with his former self as to whether to give up basketball to be a family-man only or pursue his dream, as he encourages Haley to do at a USO concert for Marines. Lucas punches Julian in the face but must reconsidering collaborating on the movie he already sold the rights to. Monogamous virgin Millicent is made absurdly jealous by teaser Gigi.

In a very special episode, Chad Michael Murray pens an homage to the classic films of the 1940s. Karen's Cafe is transformed into a glamorous nightclub with Lucas as its proprietor, Nathan as the bartender and Haley as the nightclub's resident singer.

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 Marvin 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 shares shocking news with Lucas who is still in LA with Dixon and Julian. Nathan struggles to adjust to his new career and Brooke desperately searches for Sam.

As news of Peyton's condition spreads, Marvin and Millicent struggle to remain a couple and Brooke tries to suss out Julian's intentions. Peyton and Lucas babysit Jamie and his friend, while Haley and Nathan spend a night out together with Chase and Mia.

Nathan is on the bench during five losses, but has more maturity, team spirit and insight than the arrogant, selfish star scorer. He feels this is bound to pay off, as Dan predicts. After refusing six top directors, Lucas and Julian get an ultimatum from his father, Paul. He also tells Peyton that the infidelity she dumped Julian for was his publicity stunt. Julian is incredible patient with Brooke's insecurity. Chase is Mia's ideal playmate, inspiring a new single.

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.

Nathan can't be home on his wedding anniversary, so Haley comes to Charleston to arrange a romantic dinner in a run-down but charming townhouse. She proposes to move there so they can be together more, he generously suggests she starts touring again. Understanding lover Julian tries the L-word on Brooke, but that's still too soon. Meanwhile Jamie has a dinner guest which surprises nanny granny: grandpa Dan. Parenting memories first bring the exes together, then open up bitter wounds, how both are guilty of Keith's death. After Peyton's near-miscarriage, Lucas wants to save her, but she's determined to have their baby at any cost.

Julian's dad is fired as studio boss, his projects therefore in doubt. Director Reese Dixon worries about saving pay and perks, masterly. Dan's heart finally arrives, but is lost in a doggish accident. Jamie demands the truth about Keith, but stays loyal. Sam sees Jack commit shoplifting and takes both loot and blame. Julian learns the truth and must decide whether to leave Tree Hill and Brooke. Haley may return as teacher if she publicly withdraws her support for Sam's article. She leaves to join Peyton's label as Mia's producer.

Julian offers Brooke tickets to move to L.A. with him and Sam. However, she keeps doubting and whining that she can't uproot Sam, although she's willing. Even Chase warns her not to waste such an opportunity. When Jamie asks about Keith, Nathan and Lucas take him to his auto-shop. Jack braves suspension to make all Haley's class walk out of Brumkin's boring English class. Even a college dorm PJ party can't console love-sick Mouth.

Nathan and Haley are considering a better school for genius Jamie, but doubt that academic excellence outweighs posh elitism and absence of sports. Nathan is expected to step up as leader - by coaching his ingrate rival Nino. Peyton has a car accident, which wrecks Lucas' Comet on wheels. Sam's boyfriend has found cool foster parents, and must leave Victoria expects Brooke to help save the company she stole, if not out of family loyalty then for the employees.

Nathan is offered a two year pro contract, but in Europe. He agonizes whether he should take it, as Bobby suggests, or stick to his NBA dream, as Haley advices. Jamie not only does well at his first school dance, he is the one who counsels 'babsitter' Skills to date his teacher there. While Peyton grumbles bedridden, Lucas repairs the Comet as a surprise, while both reminisce. Chase must convince Mia his affair with Brooke was and could only happen before them. Haley enjoys working with Nick Lackey, who wants her to produce music.

Warned by manager Bobby there's an NBA scout, Nathan and his protégé Nino perform excellently, then wait for a call. Lucas opposes Peyton preparing a 'posthumous' time-capsule and ask for a rushed marriage on account of her pregnancy risk. Nathan makes him reconsider and drops off Jamie with 'his uncle Keith'. Brook, Sam and Victoria are too busy to concentrate on Peyton's baby-shower or business. They are preoccupied as to whether Sam should be encouraged to spend time with birth mother Rebecca.

Peyton and Lucas' wedding day has finally arrived and surprise guests attend. Haley plays an unexpected role in the ceremony while Nathan hopes to be called up to the NBA. Antwon keeps Jamie on a short leash, and Brooke does the same with Nick Lachey.

Nathan gets some news about his future on the Chiefs. Peyton gives birth to hers and Lucas' baby daughter, Sawyer, and receive a surprise visit from Karen. Dan is on death's door, while Brooke and Victoria prepare to re-launch Clothes Over Bros.

The tree hill gang must learn that to live an exceptional life doesn't end once you've achieved your goals. With Lucas and Peyton gone, Nathan's a year into his NBA career, Haley has taken over Red Bedroom Records, and has to deal with the return of her free-spirited 26 year-old sister, Quinn. Brooke is still happy with Julian.

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.

A disgruntled Renee makes her pregnancy known in the national media. Quinn tells David that she wants a divorce and spends the night with Clay. Mouth quits his job at the station after he is forced to report on the scandal surrounding Nathan. Brooke's fashion show is a huge success but Victoria warns her about Alex and Alex's obvious designs on Julian.

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.

Nathan and Jamie join Haley on tour as it comes to a close. Quinn gets her divorce from David. Millicent appears in court for her DUI where Victoria offers her a job as her assistant at Clothes over Bros. Brooke finds it hard to trust Julian particularly when Alex is always by his side and ends up turning to new menswear designer Alexander Coin. Elsewhere, Haley and Quinn's sister Taylor turns up in Tree Hill with Quinn's ex-husband David who is now her boyfriend. Meanwhile, Mouth returns from L.A.

Nathan tries to calm Haley down after Taylor and David's shock announcement that they are a couple and then through the ensuing dinner that Taylor plans out until all three James sisters find themselves in the pool fighting it out. David and Quinn talk and he agrees with her that their marriage is at an end. Julian takes offense to the director hired for his new film and fires him after he punches him for insulting Alex. Finally after talking to Brooke rationally and asking her to be the movie's costume designer she makes him see that he should direct the movie himself which he brings up with his father who agrees. Mouth and Lauren fix up the disheveled apartment after Millicent's recent partying and then tells Millicent he is staying in Tree Hill. Millicent and Brooke agree to try and be friends again.

Flashback to the '80s.

Haley, Quinn and Taylor receive a surprise visit from their mom Lydia who tells them that she has incurable pancreatic cancer and that she is not seeking any further treatment. Quinn takes the news very hard but Clay is there to support her. Meanwhile, Alex sets her sights on Alexander as Brooke and Julian try to get their old relationship back on track, and Millicent finds herself struggling with temptation.

Haley and Quinn refuse to accept that their mom Lydia will not fight her pancreatic cancer and after some convincing manages to persuade her mother to get a second opinion with Nathan's doctor but the results don't bring any change. Because she told Jamie that she won't be alive for Christmas he organizes for her to have Christmas now with the family. Meanwhile, Brooke and Julian's relationship moves up a notch but comes crashing down spectacularly when Brooke finds Alex in his bed but is it what it seems? Elsewhere, Grubbs puts Miranda through hoops before he allows her to produce his album with her and Owen Morello comes back into Millie's life much to Mouth's displeasure.

In getting back at Julian for sleeping with Alex, Brooke messes with the costumes for the shoot and generally does her best to wound Julian but it takes comments from Alex to get her thrown off the set after she punches Alex in the face. Only later does she discover that it was Alexander that Alex slept with as she switched rooms with Julian. She tells Victoria who is furious and it later transpires that her mystery lover is Alexander. Meanwhile, Lydia takes ill from her cancer and is hospitalized and reaches out to the daughter Taylor but it is Quinn who manages to get her to come before she dies. Elsewhere, Clay tells Katie he won't be representing her but it doesn't put off Katie and she finds out that he was married to Sara so she transforms herself to look like her. Lauren and Mouth nearly get it together only for Skills to come back to Tree Hill.

Quinn's gallery opens with Clay very supportive unaware that he is being stalked by Sara lookalike Katie until she makes her presence known and Clay shows Quinn how alike Katie is to Sara. Josh's sex tape with Alex is emailed to Julian's father with a demand for $1,000,000 putting the film in jeopardy. Miranda finds out she is being deported thus putting a spanner in the works with Grubbs's recording but Grubbs finds a way around it by proposing to her. Lauren tells Skills that she has fallen for someone else but he is unaware it is his best friend Mouth until he sees a photo of them at the gallery where he promptly punches Mouth. Meanwhile, Victoria's affair with Alexander is exposed in more than one way. Elsewhere, Nathan and Jamie spend a guys evening together & later he asks Haley if she'd be ready to try for another baby. She tells him she took a pregnancy test and it was negative but is she telling him the whole story?

Nathan and Haley struggle with the aftermath of her mother's death, while Brooke deals with the fallout of Alexander's tryst with Victoria. Alex discovers a secret about her leading man, Josh, that could derail Julian's film, and Quinn is confronted by an unhinged Katie.

Quinn takes Jamie on a treasure hunt as an increasingly despondent Haley further withdraws from both Nathan and Jamie. Katie invades Clay's personal space convinced that she is his dead wife Sara. Clay plays along until he manages to have her committed. Mia breaks up with Chase by text and then comes back to Tree Hill to manage a heart-broken Grubbs after Miranda leaves. Julian shows his film to a delighted Brooke as he anxiously awaits confirmation on whether his indie film will be bought by a film festival.

Haley tries to overcome her depression by joining Nathan, Jamie and the rest of the Tree Hill gang on a trip to Utah for the premiere of Julian's film.

As the gang returns from Utah, Brooke and Julian are engaged, Haley learns that she is pregnant, Nathan must leave for training camp, and Clay and Quinn are assaulted and shot by Katie.

Clay and Quinn discover they've been shot, and as they fight to live, Nathan and Haley struggle with the situation. Meanwhile, Julian tries to preoccupy Jamie, and Brooke's legal troubles mount.

As the situation at the hospital worsens; Nathan makes a huge decision regarding his career. Brooke and Julian take Jamie for the day, while Victoria and Millicent hatch a plan.

As Brooke deals with the mounting financial troubles at Clothes Over Bro's, 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.

Nathan is furious when his first mission as Clay's junior agent seems to go wrong because of his lack of jargon knowledge, but he actually lands the football client. Julian accepts Alex's suggestion to assemble all potential best men for a friendly poker night, but the mood is murderous. Chase gets abused by everyone. It's Brooke's turn to be bullied by Julian's bossy ma who pushes for a traditional wedding at a brides fair, where Haley - blaming pregnancy hormones - sides with the enemy every time.

Clay finally gets some hand muscle control back. As he predicted, Nathan had no reason to be gloomy about his first contract, football talent Troy, which is signed to all parties' satisfaction. Julian and Brooke stand up to his mother, who has to back down on the fancy wedding plans but relapses into drinking. After some occupational therapy for Mouth and himself, Chase handles his Alex-Mia-dilemma. In Nathan's absence, Jamie finds it even harder to face the peril of peer ridicule for getting braces, which Haley only compounds by wearing a 'commiserative' eye-patch.

The gang gathers at Nathan and Haley's to spend Thanksgiving with friends and family.

Nathan goes back to college and opts to take a harder class but he doesn't get a very welcome reception from his college professor and so with Jamie's help they figure out a way for Nathan to do better at college. Haley and Mia book Erin as warm-up act to Kid Cudi at Tric with both Mia and Alex acting as competing bar staff. Elsewhere, Quinn looks up Dan Scott and enlists his help to kill Katie Ryan but he manages to talk her out of it but she may regret her decision as Katie heads back to Tree Hill. Julian finds a list belonging to Brooke of things she's always wanted to do but never got around to so he sets about making them all come through so that she gets her lost inspiration back.

A storm strikes Tree Hill, putting everyone's life in danger.

After a wild night out on the town for her bachelorette party, Brooke and the girls try to piece together the night before amidst the wreckage of the day after.

The biggest day of Brooke Davis' life has arrived, her wedding day. Julian gets his parents to agree to a truce on their special day, but will they uphold their end? Brooke makes up with her mom, and when her dad fails to turn up, her mom walks her down the aisle. Nathan's advice of sincerity helps inspire Julian's 'best man' Jamie to make a brilliantly simple speech. Chase disagrees with Skills' absurd security-obsessed job description for them as ushers. He ends up making hotter use of the limousine.

Brooke, Quinn and Haley decide to use their talents for the greater good. Meanwhile, Julian takes on a directing job and helps out a friend, and Chase mentors Chuck.

Sex games, secrets and shoelaces all come into play as the couples of Tree Hill celebrate Valentine's Day.

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.

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.

While Haley stays at home to take care of the new baby, Quinn organizes a concert at Tric. Meanwhile, Brooke gets an offer to return to Clothes Over Bros, and Nathan sets his sights on exposing Professor Kellerman.

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.

Nathan, Jamie, Clay, Julian, Chase and Chuck have a camp-out on the Rivercourt. Meanwhile, Brooke, Quinn, Alex and Lauren take a trip to Puerto Rico.

Haley and Brooke get ready to re-open Karen's Café as Brooke's pregnancy progresses. At her scan she discovers that she is expecting twins. Nathan and Clay set off on the road to scout new talent and it forces Nathan to finally go and see Dan. Chase leaves for the Air Force leaving behind two disappointed people - Chuck and Alex. Meanwhile, Mouth and Millie start their new morning show together but Millie is wooed away to start a new show with another co-anchor in Charlotte.

Before tired Nathan can finally rejoin his longing family, Dan has turned up and secured himself a temporary stay on account of his burnt-down restaurant, where he lived, but may have torched it. Chase is happy but exhausted on account of running the bar and an intense sex life with Alex. As if nocturnal baby care exhaustion wasn't bad enough for Julian and Brooke, his studio project only seems to bring debt and her boys fashion label fails to get financed, but her father Ted Davis actually turns up for the twins' christening. Clay's exhaustion is diagnosed medically serious. Chris Keller got engaged by Haley's music label under an alias, immediately antagonizes Alex but proves himself an genius producer.

Chase confides only in Chuck his plan to move Alex's things into his place. They ignore Chris Keller made her an offer for a career-boosting, national tour. As even the psychiatrist Clayton grudgingly consults can't properly diagnose his problems, Nathan decides with support from Jamie and Haley to attend in his pace the European forum for international sports talent scouting. This allows Dan to prolong his stay and carry out a mysterious plan. Julian warns Brooke that Victoria tries trough him to sabotage her father's apparently business-wise sound project to co-found a male fashion label.

Chase is heartbroken after Alex's desertion to take the tour Chris Keller advised, yet overcomes his bitterness toward Keller, who pleads her artist temperament was a lost case from the start. Julian is near despair about the unused studio until a TV series project comes within reach. Alas coaxing the studio proves tragically incompatible with paternal duties, while Brooke charms investors for her boys fashion project with her father. Clayton's problem is worse then thought, as Quinn discovers spying on him. Haley now runs Karen's café, but her cook is sick, so Dan steps in but that costs some bigot customers, and a mystery competitor opens across the street.

Julian is even more shattered than Brooke, who gives him the silent treatment, over having forgotten baby son Davis in his car. Although the boy is alright, Brooke leaves with the twins until Haley talks sense into her. Drunk, Chase enjoyed a wild night with a shameless flirtster but shyly wriggles out of continuation in the morning, on account of Alex's memory, only to find her with Chris Keller the next day. Dan and Jamie enjoy camping but dreaded Nathan's return is likely to mean grandpa's exit. After Dan scares away Clay's dealer, he comes clean to Quinn and consults Dr. Alvarez, who promises recovery but only after residential therapy.

Chase bravely bares Chuck's absurd, imitative adoration for 'cool', actually neglectful Chris Keller and stands by the ingrate knave when his father Wade Scolnic finally visits, but discards Chase as if a random babysitter. Nathan is missing since his flight home from Europe days ago. After cocky Keller helps activating Tree Hill PD officer Stevens, Haley finds Dan's cash stash and suspects a horrible crime. Julian can't forgive himself even now his loved-ones do, blames himself for bullying by strangers and picks a bar-brawl to get a 'bloody good' beating. Pushed by Dan and Quinn, Clay checks in for residential therapy with Dr. Alvarez, keeps dismissing 'mere talk' as therapy, but decides against signing out after meeting shy Logan, a neglected orphan boy who hangs around the rehab clinic.

Dan enlists Julian to help in his search for Nathan. Mouth fills Clay in about Nathan, as Haley explains Nathan's disappearance to Jamie. Brooke gets an idea of how to bring patrons to an empty Karen's Café, and Chris Keller confronts Chase about Tara.

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.

Haley receives news of a possible tragedy. Dan's search for Nathan leads him back to his dark past. Clay has a breakthrough in his treatment. Brooke and Julian deal with Xavier. Chase's concern for Chuck pushes him to his limits.

Brooke and Julian take new measures to protect their family. Skills helps Mouth get to a turning point, and Chase faces consequences for defending Chuck. Clay reaches a new understanding with Logan.

Dan, Julian and Chris Keller attempt to rescue Nathan. Brooke's conflict with Xavier escalates. Quinn and Clay revisit the past.

Nathan's practically safe return causes general joy. The only downside is Dan's condition, probably terminal, but the whole family is in a forgiving mood while reminiscing, only Lucas refuses to come. Julian is welcomed as a hero and hears Brooke survived Xavier's attack, then stands by her as a paternal visit proves too good to be truly non-business. Clay goes to Sara's parents, who have raised Logan, and gets them to agree to let his son be invited home with him and Quinn.

Julian finally sells his One Tree Hill series concept to a studio and is hired to complete the script. Clayton and Quinn, who welcomes Sara's memory to, patiently win Logan's trust to become a warm; close family. Chase gets over his confidence crisis as bar manager just before he's offered a chance to buy Tric from Karen on the boat burning day. After Julian scolds father-in-law a useless father and Brooke 'surprises' her divorced parents back in bed, an unexpected business move makes up for a lot.

In the final chapter of One Tree Hill, the tenth anniversary of Tric brings old faces and new possibilities for the Tree Hill family. To celebrate the 10th anniversary they host a concert at Tric that includes Gavin Degraw. Julian buys Brooke's childhood home for them to live in. Nathan and Haley celebrate their 10th wedding anniversary.

A disgruntled Renee makes her pregnancy known in the national media. Quinn tells David that she wants a divorce and spends the night with Clay. Mouth quits his job at the station after he is forced to report on the scandal surrounding Nathan. Brooke's fashion show is a huge success but Victoria warns her about Alex and Alex's obvious designs on Julian.

Brooke buys Karens Cafe, and turns it into a Clothes Over Bro's boutique. Everyone goes to the opening of the store, including Brooke's Manager mother, who has seemed to track her down. Lucas and Peyton cause friction at the opening.

Lucas is joined by a familiar face on his book tour; Nathan questions his health when he is given an opportunity to play basketball again.

Haley, Quinn and Taylor receive a surprise visit from their mom Lydia who tells them that she has incurable pancreatic cancer and that she is not seeking any further treatment. Quinn takes the news very hard but Clay is there to support her. Meanwhile, Alex sets her sights on Alexander as Brooke and Julian try to get their old relationship back on track, and Millicent finds herself struggling with temptation.

Lucas confronts Dan's announcement about his life expectancy of only 6 months without a heart transplant. He calls Dan a liar until the cardiologist confirms it. Nathan wrestles with his feelings, and Jamie's burning desire to get acquainted with his 'cool' grandfather, while Dan begs for a last chance to repair his shattered family. Nathan and Jamie come up with a daring alternative for the injured Ravens. Mouth suddenly gets a triple break as sports presenter.

Nathan wrestles with his former self as to whether to give up basketball to be a family-man only or pursue his dream, as he encourages Haley to do at a USO concert for Marines. Lucas punches Julian in the face but must reconsidering collaborating on the movie he already sold the rights to. Monogamous virgin Millicent is made absurdly jealous by teaser Gigi.

After a wild night out on the town for her bachelorette party, Brooke and the girls try to piece together the night before amidst the wreckage of the day after.

Quinn takes Jamie on a treasure hunt as an increasingly despondent Haley further withdraws from both Nathan and Jamie. Katie invades Clay's personal space convinced that she is his dead wife Sara. Clay plays along until he manages to have her committed. Mia breaks up with Chase by text and then comes back to Tree Hill to manage a heart-broken Grubbs after Miranda leaves. Julian shows his film to a delighted Brooke as he anxiously awaits confirmation on whether his indie film will be bought by a film festival.

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.

A storm strikes Tree Hill, putting everyone's life in danger.