Due to the aftermath of the release of the time capsule, chaos breaks out. Someone is holding students of Tree Hill hostage with a gun, shooting. While lives hang in the balance, Nathan and Lucas put themselves at risk to protect their friends and loved ones. Young lives are shattered and two lives will end.

Nathan worries about Haley as they prepare to renew their vows. Peyton and Brooke's friendship becomes strained and Deb confesses to Dan about the fire.

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

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.

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.

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.

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.

It is revealed that Lucas knows who tried to kill Dan and he confronts the guilty party. Brooke, Peyton and Haley find themselves behind bars. Peyton finds her guilty conscience on the surface. Chris Keller convinces Nathan to be his wingman at a high-stakes poker game. The residents of Tree Hill finally choose a mayor.

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. 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.

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 mother's cancer, 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.

As the Ravens prepare for the championship, Lucas learns Nathan intends to throw the game and decides on a risky plan to even the odds. Karen insists Deb show up for her son's final game and tries to help her get there. Also Dan makes a last plea with Daunte.

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.

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.

Tree Hill bids goodbye to the past while anticipating the future: Lucas and Peyton prepare for the birth of their child with the help of a surprise visitor, Dan nears his end, and Brooke works with Victoria to relaunch Clothes Over Bro's. Meanwhile, Nathan returns to Tree Hill to face Haley and Jamie after being released from the Chiefs.

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 search for Nathan becomes increasingly dangerous, and Dan’s life hangs in the balance. Brooke is surprised when her father returns. And Clay and Quinn reconnect with Logan.

In the final chapter of One Tree Hill, the tenth anniversary of Tric brings old faces and new possibilities for the Tree Hill family.

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.

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.

While holding a vigil at Lucas' bedside as he lays in a coma, Karen meets her son's new girlfriend and learns from Deb that she is divorcing Dan. Most shocking of all, Karen is horrified to discover that Keith was drinking while driving at the time of the accident. Meanwhile, Nathan tries to win Haley back after she dumps him.

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.

In the third season premiere, we finally discover Dan's fate after the fire. Besides the situation with his father, Nathan also has to deal with Haley's reappearance in Tree Hill and the future of their relationship. Meanwhile, Peyton tries to find the truth about the mysterious woman who pretends to be her mother. Also, Lucas looks forward to Brooke's return after a summer apart.

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?

Nathan deals with a player who is a rival both on and off the court. Meanwhile, Brooke and Mouth look to get even with Rachel. Dan has a run-in with Cooper; and Peyton comes to a major decision.

In the sixth season premiere, Tree Hill residents must make a decision that will change their lives forever. Lucas finally pursues his dream with the woman he loves, Brooke must face a reunion with her mother, Mouth makes a revelation, Nathan and Haley must face a ghost from their past and the news of Dan's accident is slowly beginning to spread.