While Lucas deals with devastating news in a violent manner, Brooke has her own emotions to deal with as Angie undergoes her surgery sooner than expected. Meanwhile, Haley debates recording a new album; Nathan pushes himself in order to get back to into shape; and Lucas reveals a shocking truth to Peyton.
Lucas learns that Dan’s life my be in danger due to his heart condition and heads out to investigate. Haley struggles with letting Dan be a part of Jamie’s life while Nathan helps Quentin reinvent his game. Meanwhile, Brooke has trouble balancing her career with life as a mother; Peyton tries to deal with her guilt over Lucas’ breakup with Lindsay; and Mouth gets a chance to live his dream career as a sports anchor.
Lindsey returns to Tree Hill for Jamie’s birthday party, giving Lucas a chance to try to repair their relationship. Meanwhile, Brooke and Peyton prepare for life with a baby; and Dan tries to get back into the lives of his family, which results in him revealing a dark secret to Nathan and Haley.
In the 100th episode of One Tree Hill, it’s Lucas and Lindsey’s wedding day and Peyton must decide whether to intervene with the ceremony or lose her soul-mate forever. Nathan uses the event to try to mend his marriage to Haley. All are shocked when Dan, who is out of prison on parole, shows up at the event.
The night before Lucas’ wedding to Lindsey, Lucas and Lindsey work to save Nathan and Haley’s marriage while Brooke sets Peyton up with a date to the wedding — a surprise old boyfriend. Rachel returns to Tree Hill to find the same challenges while Dan also returns, hoping to make a clean start.
Brooke takes Owen to New York to show him the other side of her life, but there she must face a person from her past. Haley is devastated over news that changes her marriage forever, while Nathan and Lucas decide whether or not to attend Dan’s parole hearing. Meanwhile, a major record label takes an interest in Mia, much to Peyton’s chagrin.
As Lucas and Skills coach the first Ravens’ basketball game of the season, Haley, Brooke, Lindsay, Peyton and Mia find themselves locked inside the Tree Hill High library. Tensions in the library run high as Peyton and Lindsay butt-heads over Lucas and Brooke tries to defend her mother to her friends. Meanwhile, Mouth, who is covering the basketball game, struggles to find his story. Later, Nathan and Lucas commiserate about their decisions to tell their respective loved ones about their indiscretions.
As Peyton confesses her true feelings to Lucas, Brooke makes a play for Owen, the bartender at TRIC, and Mouth tires to convince Millicent he’s a good guy. Meanwhile, Haley must wrestle with the fact that she has information that would ruin Lucas’ relationship with Lindsay, and Nathan finds himself in a situation that could end his marriage. Later, Lucas and Skills prepare for their first game of the season.
