Plot:Lucas is hurt by devastating news, and he makes a surprising revelation to Peyton. Elsewhere, Brooke?s foster baby has an emergency operation; and Skills and Nathan take a risk as they try to turn the Ravens? season around.

Plot: Lucas investigates the supposed progression of Dan’s heart condition as Haley deals with letting Dan develop a relationship with Jamie. Meanwhile, Mouth gets a chance to be a sports anchor; and Nathan gives Quentin advice about getting his game back.

Plot: 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.Guest Stars: Barbara Alyn Woods as Deb Scott, Cullen Moss as Junk, Lisa Goldstein as Millicent, Vaughn Wilson as Fergie, Michaela McManus as Lindsey Strauss Director: Paul Johansson Writer: Elisa Delson

Plot: Lucas and Peyton discuss Lucas’ aborted wedding, while Brooke gets a phone call that could change her life, and Millicent and Mouth take a new step in their relationship. Haley (Bethany Joy Galeotii) takes the first tentative steps towards a new career, and Nathan (James Lafferty) contemplates what it would take to get his game back. Antwon Tanner also stars. Liz Friedlander directed the episode written by Mark Schwahn.

Plot: Lucas tries to deal with being left at the altar, while Haley and Nathan handle the fallout from Jamie’s abduction and recovery. Elsewhere, Brooke looks into adoption; and an old friend visits Peyton.

Plot: 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.

Plot: 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.

Plot: No Summary

Plot: 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.

Plot: 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 coach their first game of the season.