ONE TREE HILL

In the ninth season premiere, the series welcomes new hopes, challenges and dangers ... and a few familiar faces.

Brooke discusses a new venture with her dad (RICHARD BURGI). Chris Keller makes Alex (JANA KRAMER) an offer she may not be able to refuse. Nathan volunteers to scout in Europe.

Dan helps a struggling Haley at Karen's Café, Quinn discovers Clay is hiding something from her and Chase tries to mend a broken heart. Julian makes a life-changing mistake.

As Julian deals with his guilt, Brooke helps Haley confront a rival cafe and its difficult owner. Quinn takes extreme measures to help Clay realize he's worse than he thought.

Nathan is missing and Haley fears the worst. Clay gets answers about his condition. Brooke tries to give Tara (CHELSEA KANE -- Dancing with the Stars) a chance.

Dan enlists Julian to help in his search for Nathan, and Haley explains the disappearance to Jamie. Chris Keller confronts Chase about Tara (CHELSEA KANE).

Haley seeks help from Lucas (guest star and former series star CHAD MICHAEL MURRAY). Brooke comes face to face with Xavier (recurring guest star DEVIN McGEE).

Dan's search for Nathan leads him back to his dark past. Clay has a breakthrough in his treatment. Former series stars BARBARA ALYN WOODS and ANTWON TANNER guest star.

Chase faces consequences for defending Chuck (MICHAEL MAY). Clay reaches a new understanding with Logan (PIERCE GAGNON). Haley partners with Dan in his search for Nathan.

Brooke's conflict with Xavier (DEVIN McGEE) escalates.

Dan risks everything for Nathan. Brooke is surprised when her father (RICHARD BURGI) returns. Clay and Quinn reconnect with Logan (PIERCE GAGNON).

Clay and Quinn get ready for Logan's (PIERCE GAGNON) first night at the beach house, and Julian tries to breathe new life into a past idea. Series star Sophia Bush directs.

Take a look back at the Tree Hill family through this series finale retrospective.

It's the series finale -- how will the saga end?