Half-brothers Lucas and Nathan Scott trade between kinship and rivalry both on the basketball court and in the hearts of their friends in the small, but not so quiet town of Tree Hill, North Carolina.
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 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.
Brooke deals with the mounting financial problems at Clothes Over Bro's; Julian starts a new film project; Alex and Chase spend an afternoon together.
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.
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.
Nathan considers leaving the NBA; Victoria and Brooke try to handle the company's financial problems; Chase learns a secret about Alex.
Lying in a coma after his race car 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 growing up on the wrong side of the tracks. After waking up, Nathan phones Haley and tells her he doesn't want her to come home.
Brooke and her father discuss a new business venture; Julian worries about his investment; Quinn talks Clay into getting help; Millie tries to be honest with Mouth; Alex receives a tempting offer.
As Brooke and Julian begin to adjust to life with their new children, 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.
Haley (Bethany Joy Galeotti) considers taking matters into her own hands as Nathan’s (James Lafferty) scandal threatens his endorsement deals. Julian (Austin Nichols) gives Alex (guest star Jana Kramer) another chance, and Brooke (Sophia Bush) reconnects with Chase (guest star Stephen Colletti). Millicent (Lisa Goldstein) questions whether she has what it takes to be a model. Meanwhile, Clay (Robert Buckley) lets Quinn (Shantel VanSanten) in on a big secret.
While recording her new album, Haley must work to save Red Bedroom Records and enlists Mia's help to do so. Meanwhile, Brooke, with Millicent's help, searches for the new face of her clothing line; Clay defends Nathan as the scandal continues to grow; Julian and Brooke decide to move in together; and Dan returns to Tree Hill with a new bride in tow.
The girls of Tree Hill have a slumber party, at which time secrets are revealed and bonds are made. Meanwhile, Nathan and Lucas road trip to Charlotte for a basketball game, and unknowingly to Lucas, they embark upon free HCM tests, a genetic heart condition that Dan maintains. Karen and Andy have a row.
As Brooke and Haley prepare to re-open Karen’s Café, 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.
Lucas falls asleep and dreams of a 1940s Tree Hill were he owns Karen's Cafe. Here, Dan is a dangerous mobster and everyone is entangled in his web: Brooke owes him money, Mouth is searching for proof that would link him to Keith's murder, Haley is his former lounge singer, and Lucas is in love with his step-daughter Peyton.
It's confrontation time in Tree Hill, as Lucas confronts Peyton about her nasty behavior towards Lindsey and Brooke must confront Victoria about meddling with Peyton's record label. Meanwhile, Nathan begins to grow closer to Carrie, Haley continues to struggle in dealing with Quentin, and Mouth must choose sides between his co-workers and Alice.
While Julian makes Brooke a surprising offer, Lucas takes Nathan and Jamie to an important place from his past. Meanwhile, Peyton prepares for the future; Sam and Jack go up against the principal who fired Haley; and Skills and Mouth go on a road trip to help Mouth forget Millie.
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.
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.
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.
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, 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 seeks help from Lucas as Nathan (James Lafferty) makes an escape attempt. Brooke comes face-to-face with Xavier. Juliain uncovers evidence that assists Dan in his search for Nathan. Clay makes a connection with another patient.
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.
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.
Haley is surprised when her older sister Taylor comes to town, but not as shocked as Nathan, who recognizes Taylor from a past tryst. Brooke and Felix decide to become boyfriend and girlfriend. Jake makes a special visit to Peyton. Anna tells a secret to Lucas.
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