Plot: On the day of their re-commitment ceremony, Nathan can’t shake the feeling that something horrible is about to happen to Haley. The ceremony goes as planned until Rachel gives a drunken speech about Cooper and a series of events leads to a possibly tragic event. Elsewhere, Lucas stumbles upon two pregnancy tests, one of which he learns is his mother’s; and Peyton and Brooke’s relationship falls apart when Brooke learns about Peyton and Lucas’ kiss during the shooting.

Plot: With the re-commitment ceremony rapidly approaching, Brooke agrees to make Haley’s dress, but the final product is less than flattering. Brooke takes charge of the rehearsal dinner and puts her own unique spin on the event. Meanwhile, Peyton has to confront her feelings for Lucas; and Brooke comes up with a special way to fix Haley’s wedding dress.

Plot: At the league tournament, Nathan and the team have to find a way to win with Lucas no longer on the team. At the tournament, Nathan has to deal with an old rival both on and off of the court. Brooke and Mouth stumble across a plan to get back at Rachel. Meanwhile, Deb and Nathan get a restraining order against Dan; and Peyton, in Savannah with Jake, is left with a decision that could change the course of her life.

Plot: Lucas takes the court for the first time since Keith’s death, but finds it impossible to play. Brooke uses materials she stumbled on at the cabin to seek revenge on Rachel, but ends up angering Mouth and pushing Mouth and Rachel closer together. Meanwhile, Nathan and Haley begin to plan their recommitment ceremony but are stunned when they fail a compatibility test. Peyton debates whether or not to head to Chicago to spend the weekend with Pete Wentz and ends up running into a person from her past at the airport.

Plot: The kids load up and head out to Rachel’s cabin for a weekend to kick back and heal after the tragedy that rocked Tree Hill. There, Nathan decides to propose to Haley, but has trouble getting her wedding ring away from her to do so. Fall Out Boy’s Pete Wentz shows up in order to spend more time with Peyton, much to the shock of the others, and Mouth and Rachel are able to talk about the release of the time capsule. Meanwhile, Skills and Bevin get lost in the woods; Karen lets her anger out on Dan; and Nathan is finally able to have the perfect moment he planned with Haley.

Plot: Tree Hill comes together to cope with the school shooting tragedy that resulted in two deaths. Dan grapples with the guilt of murdering Keith after Keith’s funeral. With this guilt, Dan attempts to make up time with Lucas and Karen, but Karen’s anger towards him only adds to the guilt. Meanwhile, Nathan and Haley see that life is too short to be apart and decide to live together again. Elsewhere, at a party thrown at the school to help ease the pain of the shooting, Mouth learns who really released the time capsule; Brooke is hurt when Lucas isn’t able to talk to her about Keith’s death; and Lucas disobeys Karen and attends Jimmy’s funeral.

Plot: Lives hang in the balance when a student brings a gun to school. In the mayhem resulting from the first shot fired, Brooke is able to get out of the school, but leaves Peyton behind. Nathan and Lucas run back into the line of fire to protect Haley and Peyton. There, Peyton reveals her true feelings for Lucas; and Nathan and Haley become trapped with other students and the gunman in the tutor center. When the situation is over, two lie dead and the lives affected will never be the same.

Plot: When last year’s time capsule is released, everyone’s secrets are revealed, forcing Lucas and Mouth to confront the anger of a person from their pasts. Brooke suspects that she knows who released the capsule, but has to deal with what she exposed on the time capsule. Meanwhile, Nathan’s entry forces him and Haley to talk about the person Nathan became when she left; and TRIC hosts the breast cancer benefit concert where Haley performs for the first time since she came back to Tree Hill alongside Fall Out Boy and Jack’s Mannequin.

Plot: Brooke heads to New York for the Rogue Vogue fashion show where she encounters a life very different from her own — a whirlwind life of non-stop partying, drinking and drugs that makes her think about what she really wants the most. At the annual Secret competition, Nathan and Lucas reevaluate their own lives after spending the night with the family of an old friend. With Brooke in New York, Rachel takes over as head of the squad and Peyton joins her for a night of drinking to get over Ellie’s death. Meanwhile, much to Rachel’s dismay, Brooke decides to leave New York to be with her friends at the competition, which the squad ends in style, and Haley and Nathan use their hotel room as the honeymoon suite they never had.

Plot: When a violent rainstorm causes a blackout in Tree Hill, Haley and Nathan are able to work through their problems and start rebuilding their relationship. In the middle of the rain, Brooke and Lucas resolve their latest problem and finally have a romantic night together. Meanwhile, Mouth spends the blackout with Rachel where he begins to learn more about who Rachel is on the inside; Peyton asks Ellie to tell her the truth about her cancer; and Keith and Karen are able to spend some time alone together.