One Tree Hill

Brooke returns to Tree Hill. Lucas welcomes his mother at the airport. A woman claims to be Peyton's mother. Nathan deals with Haley's reappearance and Dan's fate after the fire.

Brooke plans a party. Nathan connects with Haley but clashes with Lucas. Lucas struggles with Brooke's dating rules. Peyton deals with family secrets. Dan remembers what happened.

Estranged spouses Nathan and Haley adjust as classmates. Brooke plays coy. Lucas learns a secret about Peyton's mom. Dan starts to uncover the truth about the dealership fire.

At a masquerade ball, Haley wants to win back Nathan, Brooke wants to seduce Lucas, FALL OUT BOY performs and Peyton tries to accept her birth mother. Dan gives Deb an ultimatum.

New basketball captain Nathan clashes with Lucas over Haley. Brooke's new cheerleader choice is interested in Lucas. Dan's bid for mayor is challenged by an unlikely opponent.

Brooke devises a "Fantasy Boy Draft." Haley and Peyton fight for Nathan. Lucas tries to keep up with the brutal pace of practice. Mayoral candidate Dan clashes with his opponent.

Brooke goes on a weird double date. Lucas gets closer to Rachel. Mouth spends time with an old friend. Peyton regrets her choices. Karen and Deb take the campaign to new heights.

Lucas worries about his commitment. Nathan accuses Lucas of being the team's weakest link. Peyton and Haley ignore differences to support Brooke. Dan resorts to a smear campaign.

Lucas knows who tried to kill Dan. Brooke, Peyton and Haley end up behind bars. Nathan helps at a high-stakes poker game. The residents of Tree Hill finally choose a mayor.

On a road trip, Lucas reconnects with a friend. Brooke, Haley and Mouth launch the Clothes Over Bro's web site, but demand exceeds supply. Deb tells Nathan she tried to kill Dan.

The Ravens are berated by Whitey. Peyton and Ellie try to recruit a rock band for a benefit album. Haley tells Nathan a disturbing fact. Brooke plans a romantic night for Lucas.

Influenced by a counselor, Nathan and Lucas want to impress a basketball scout. Mouth gets caught between Brooke and Rachel. Peyton and Ellie grow closer while finalizing their CD.

A rainstorm leads Haley to Nathan's doorstep and Brooke into a dramatic confrontation with Lucas. Peyton faces the truth about Ellie's illness. Mouth is tempted by Rachel.

Brooke's trip to a fashion show keeps her from a cheerleading tournament. Nathan and Lucas are influenced by an old friend's father. Peyton struggles with her mother's cancer.

A time capsule causes problems. Dan learns to forgive Keith. Haley must reconcile the man Nathan used to be with the man he is. Peyton does a Breast Cancer benefit concert.

A normal day becomes deadly when a despondent student brings a gun to school. With lives in the balance, Nathan and Lucas take risks to protect their friends and loved ones.

Nathan reassesses his relationship with Haley. Brooke and Rachel join forces to heal the student body. Dan deals with having shot Keith. Lucas and Peyton consider their kiss.

Haley's friends plan to surprise her. Peyton gets an unexpected visitor. Mouth harbors resentment towards Rachel. A game reveals a secret. Karen confronts Dan about Keith's death.

Lucas reconsiders playing basketball now that Keith is dead. Brooke makes Rachel deal with a secret. Nathan and Haley's reprise wedding plans are tested. Peyton goes to Chicago.

Nathan faces an old basketball rival who is interested in Haley. Brooke and Mouth plot revenge against Rachel. Dan clashes with Nathan's uncle. Peyton makes a big decision.

On the night before Nathan and Haley's wedding, Brooke argues with Haley over the wedding dress. Lucas and Karen return to Tree Hill. Peyton makes a startling discovery.

Nathan worries for Haley's safety. Peyton and Brooke's friendship is tested before the wedding. Deb tells Dan the truth about the dealership fire. Karen needs Keith more than ever.