The girl of Lucas' dreams shows up at the airport. Nathan's comeback is halted by news that could change his career, and Dan's life is in limbo. Plus, Mouth and Millicent wrestle with leaving Tree Hill, and Brooke and Victoria's battle over Clothes over Bros comes to a surprising head-to-head.
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As Lucas and his fiancée enjoy planning their dream wedding, Brooke and Peyton reconnect, and Brooke, reeling from a threat to her store, reaches out to an unexpected ally. Nathan works with Quentin on his basketball skills, but Haley fears for Nathan's well-being. And Jamie catches Skills and Deb kissing.
Lucas returns from Las Vegas to face a tragedy, as Nathan and Haley struggle to find a way to help Jamie understand the death of someone close to them.
Lucas struggles to inspire the Ravens, while Haley investigates the disappearance of Dan. Brooke confronts an old demon from her past, and Nathan comes to terms with Deb's relationship with Skills. Plus, Peyton is surprised when a famous musician visits her studio.
Lucas and Lindsey face a tenuous future, and Nathan receives an offer from a pro basketball team. Haley unwittingly puts Jamie's life in peril, while Brooke struggles with giving up her company. Plus, Peyton discovers a dark secret about her new recording artist and Haley learns the truth about Dan, which leads to a final showdown with Nanny Carrie.
Lucas is joined by a familiar face as he begins his second book tour. Nathan is given an opportunity to play basketball again, which forces him to question his health. Haley tries to help a student in need. Brooke considers a life-changing proposition, and Peyton and Mick have a confrontation over his identity.
Nathan and Haley must parent Jamie about facing a school bully, and Lucas and Peyton adjust to life as a couple and living together. Plus, Brooke finds being a role model not as easy as she expected, and Mouth tries to get his old job back.
Lucas' novel receives unexpected and surprising interest; Mouth receives interest as well, from his new intern. Jamie grows enamored of Sam and her rebellious facade, and a would-be suitor grows enamored of Brooke. Meanwhile, Haley counsels Nathan as his basketball comeback gains momentum.
The past comes home to roost as the residue of deception, anger and romantic mistrust permeates the lives of several Tree Hill residents. Nathan finds himself face to face with an old rival; Brooke deals with someone who once hurt her; and Lucas's novel leads him into unchartered and threatening waters.
Tension fills the air backstage at Peyton's USO show, as Lucas deals with Peyton and Julian's romantic past. Haley battles stage fright and Nathan struggles with a decision that could change his career. Brooke gets a call that threatens her relationship with Sam. Millicent confronts Mouth on his relationship with Gigi.
In a special episode, Chad Michael Murray pens a tribute to the classic films of the 1940s. Karen's Cafe is transformed into a glamorous nightclub with Lucas as its proprietor.
As Lucas takes a trip to Hollywood to meet his film director and Nathan gets a pro basketball tryout. Peyton struggles with Mia to focus on her follow-up album, and Millicent confronts Mouth about Gigi. Meanwhile, Julian approaches a dubious Brooke about designing clothes for his movie, and Haley takes a reluctant Jamie to his school talent show.
Peyton receives some startling news that she must share with Lucas. Lucas is still in L.A., and discovers that Julian has been keeping another secret regarding the movie. Nathan struggles in a new professional environment, and Brooke's search for Sam, who has run away, forces her to confront her feelings about the night she was attacked.
As news of Peyton's condition spreads, Mouth and Millicent struggle to remain a couple and Brooke tries to figure out Julian's intentions. Peyton and Lucas babysit Jamie and his friend, while Haley and Nathan spend a night out together.
Lucas and Julian try to choose a director for their movie and Peyton has mixed feelings about a surprise gift from Lucas. Plus, Brooke struggles with relationship issues.
Lucas wrestles with casting for his movie while Peyton tries to prepare for their wedding. Dan advises Jamie on a school crush. Additionally, Brooke meets the actress who will play her; Nathan gets exciting news; and Haley has to make a tough decision at school.
Peyton and Lucas receive a startling surprise about the pregnancy, as the relationship between Brooke and Julian comes to a crossroads. Nathan and Haley celebrate their anniversary, while Dan and Deb babysit Jamie. Meanwhile, Mouth and Millie try to pick up the pieces of their relationship.
Lucas and Julian hit a setback with the production of the film. Peyton and Haley help Mia with her new single. Brooke must intervene when Sam is arrested. Jamie discovers the truth about Dan and Uncle Keith.
Julian makes Brooke a startling offer. Lucas brings Nathan and Jamie to an important place from his past, while Peyton prepares for the future. Sam and Jack take a stand against the principal who fired Haley. Skills takes Mouth on a road trip to get his mind off Millie.
When Peyton's pregnancy is threatened, Lucas struggles to pick up the pieces. Victoria returns to lure Brooke back to Clothes over Bros. Haley and Nathan clash over the decision to pull Jamie from his school. And Mouth tries to mend his relationship with Millicent.
Brooke discovers something that could change Sam's life. Nathan questions his dreams of playing in the NBA while Haley receives an unexpected offer from guest star Nick Lachey. Jamie and Skills mend their broken hearts at Jamie's first school dance. Meanwhile, Lucas and Peyton have a road trip to remember.
Brooke and Haley throw Peyton a baby shower, while Sam grows closer to Victoria. Lucas and Jamie bond while working on Peyton's car, and Nathan learns that NBA scouts will be at his next game. Meanwhile, Skills and Lauren go on a date that goes all wrong.
Peyton and Lucas' wedding day has finally arrived and surprise guests are in attendance. Haley plays an unexpected role in the ceremony while Nathan hopes to be called up to the NBA. Skills keeps Jamie on a short leash, and Brooke does the same with Nick Lachey.
In the season finale, Nathan is released from the Chiefs, and is forced to face Haley and Jamie. On the eve of Peyton's delivery, Lucas and Peyton receive a surprise visit from Karen. Dan is on death's door, and Brooke and Victoria prepare to re-launch Clothes over Bros.