Know This, We've Noticed
Series 9, Episode 1 Unrated
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In the season premiere, as Brooke and Julian begin to adjust to life with their new children, Haley and Nathan find themselves dealing with similar issues. Although they don’t know it yet, faces from the past threaten to interrupt plans for all their futures. Meanwhile, a mysterious problem arises for Clay and Quinn.
In The Room Where You Sleep
Series 9, Episode 2 Unrated
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Brooke discusses a new business venture with her father (recurring guest star RICHARD BURGI – Desperate Housewives), as Julian stresses about his own investment. Quinn convinces Clay to get help, and Millie struggles to be honest with Mouth. Meanwhile, Chris Keller makes Alex (recurring guest star JANA KRAMER) an offer she may not be able to refuse and Nathan volunteers to scout in Europe, leaving Dan with Haley and Jamie.
Love the Way You Lie
Series 9, Episode 3 Unrated
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Dan helps a struggling Haley at Karen’s Café. Meanwhile, Quinn discovers that Clay is hiding something from her, and Chase tries to mend a broken heart. Brooke is let down by her lunch plans with her dad, and Julian makes a life-changing mistake.
Don't You Want to Share the Guilt?
Series 9, Episode 4 Unrated
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As Julian deals with his guilt, Brooke helps Haley confront a new rival café and its difficult owner. Meanwhile, Chase's new girl has a complicated secret, and Quinn takes extreme measures to help Clay realize he's worse off than he thought.
The Killing Moon
Series 9, Episode 5 Unrated
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As Quinn distracts Jamie, Haley searches for Nathan. Clay finally gets answers about his condition. Meanwhile, Julian attempts to get back to a normal life, while Brooke tries to give Tara (recurring guest star CHELSEA KANE – Dancing with the Stars) a chance.
Catastrophe and the Cure
Series 9, Episode 6 Unrated
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Dan enlists Julian to help in his search for Nathan. Mouth fills Clay in about Nathan, as Haley explains Nathan's disappearance to Jamie. Brooke gets an idea of how to bring patrons to an empty Karen's Café, and Chris Keller confronts Chase about Tara (recurring guest star CHELSEA KANE).
Last Known Surroundings
Series 9, Episode 7 Unrated
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Haley seeks help from Lucas (guest star and former series star CHAD MICHAEL MURRAY) as Nathan makes an escape attempt. Brooke comes face to face with Xavier (recurring guest star DEVIN McGEE). Julian uncovers evidence that assists Dan in his search for Nathan. Clay makes a connection with another patient.
A Rush of Blood to the Head
Series 9, Episode 8 Unrated
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Haley receives news of a possible tragedy. Dan's search for Nathan leads him back to his dark past. Clay has a breakthrough in his treatment. Brooke and Julian deal with Xavier (recurring guest star DEVIN McGEE). Chase's concern for Chuck (recurring guest star MICHAEL MAY) pushes him to his limits. Former series stars BARBARA ALYN WOODS and ANTWON TANNER guest star.
Every Breath Is a Bomb
Series 9, Episode 9 Unrated
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Brooke and Julian take new measures to protect their family. Skills (recurring guest star ANTWON TANNER) helps Mouth get to a turning point, and Chase faces consequences for defending Chuck (recurring guest star MICHAEL MAY). Clay reaches a new understanding with Logan (recurring guest star PIERCE GAGNON). Meanwhile, Haley partners with Dan in his search for Nathan's whereabouts.
Hardcore Will Never Die, But You Will
Series 9, Episode 10 Unrated
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Dan, Julian and Chris Keller attempt to rescue Nathan. Brooke’s conflict with Xavier (recurring guest star DEVIN McGEE) escalates. Quinn and Clay revisit the past.
Danny Boy
Series 9, Episode 11 Unrated
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The search for Nathan becomes increasingly dangerous, and Dan's life hangs in the balance. Brooke is surprised when her father (recurring guest star RICHARD BURGI) returns. And Clay and Quinn reconnect with Logan (recurring guest star PIERCE GAGNON).
Anyone Who Had a Heart
Series 9, Episode 12 Unrated
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As Haley prepares to emcee the annual Tree Hill Burning Boat Festival, Brooke uses the opportunity to process her father's betrayal, while Julian tries to breathe new life into a past idea. Mouth and Millie make a change to their morning show, and Clay and Quinn get ready for Logan's (recurring guest star PIERCE GAGNON) first night at the beach house.
One Tree Hill
Series 9, Episode 13 Unrated
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In the two-hour series finale event, the tenth anniversary of Tric brings old faces and new possibilities for the Tree Hill family. The finale event will also include interviews with the show’s stars as they look back at the series’ most memorable moments and share their favorite memories.