<P> Series leads Bethany Joy Lenz and Sophia Bush continue as full - time regulars, while James Lafferty returned as a part - time regular . Paul Johansson and Tyler Hilton both return to the show for the final season as regulars, whilst former series regulars Chad Michael Murray, Antwon Tanner, Barbara Alyn Woods, and Craig Sheffer guest star . </P> <P> The season opened to 1.75 million viewers and a 0.9 Adults 18--49 rating, up 26% in viewers compared to its season eight finale . The final episode aired on April 4, 2012, concluding the series with 1.43 million viewers . </P> <P> The ninth and final seasons deals with the disappearance and ransom of Nathan Scott . Clay battles a drug addiction and later learns of a secret that turns his life upside down . Brooke faces a demon from her past while struggling to reconnect with her father . Dan's search for Nathan brings back old faces to Tree Hill . Haley battles with the prospect of being a single mother of two . </P> <Table> <Tr> <Td> <H3> Regular (edit) </H3> <Ul> <Li> Sophia Bush as Brooke Davis (13 episodes) </Li> <Li> James Lafferty as Nathan Scott (8 episodes) </Li> <Li> Bethany Joy Galeotti as Haley James Scott (13 episodes) </Li> <Li> Austin Nichols as Julian Baker (13 episodes) </Li> <Li> Robert Buckley as Clay Evans (13 episodes) </Li> <Li> Shantel VanSanten as Quinn James (13 episodes) </Li> <Li> Jackson Brundage as Jamie Scott (9 episodes) </Li> <Li> Lee Norris as Mouth McFadden (7 episodes) </Li> <Li> Jana Kramer as Alex Dupre (2 episodes) </Li> <Li> Lisa Goldstein as Millicent Huxtable (7 episodes) </Li> <Li> Stephen Colletti as Chase Adams (11 episodes) </Li> <Li> Tyler Hilton as Chris Keller (11 episodes) </Li> <Li> Paul Johansson as Dan Scott (11 episodes) </Li> </Ul> </Td> <Td> <H3> Recurring (edit) </H3> <Ul> <Li> Michael May as Chuck Scolnik (8 episodes) </Li> <Li> Pierce Gagnon as Logan Evans (7 episodes) </Li> <Li> Richard Burgi as Ted Davis (6 episodes) </Li> <Li> Antwon Tanner as Skills Taylor (5 episodes) </Li> <Li> Chelsea Kane as Tara Richards (5 episodes) </Li> <Li> Daphne Zuniga as Victoria Davis (5 episodes) </Li> <Li> Devin McGee as Xavier Daniels (5 episodes) </Li> <Li> Bradley Evans as Jerry (4 episodes) </Li> <Li> Allison Munn as Lauren (2 episodes) </Li> <Li> Barbara Alyn Woods as Deb Lee (2 episodes) </Li> <Li> Kelley Davis as Mrs. Scolnik (2 episodes) </Li> <Li> Bevin Prince as Bevin Mirskey (1 episode) </Li> <Li> Chad Michael Murray as Lucas Scott (1 episode) </Li> <Li> Craig Sheffer as Keith Scott (1 episode) </Li> <Li> Cullen Moss as Junk Moretti (1 episode) </Li> <Li> Vaughn Wilson as Fergie Thompson (1 episode) </Li> <Li> Katherine Landry as Madison (1 episode) </Li> </Ul> </Td> </Tr> </Table>

What is season 9 of one tree hill about
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