<P> The series premiere was watched by 2.5 million viewers and achieved a 1.9 Adults 18--49 rating on September 23, 2003 . However, the following week it rose to 3.3 million viewers and a 2.4 demo, becoming only one of three shows to rise in its second episode in the 2003--2004 TV season . </P> <P> Warner Home Video released the complete first season, under the title of One Tree Hill: The Complete First Season, on January 25, 2005, as a six - disc boxed set . </P> <P> The first season follows junior Lucas Scott as he joins his high school basketball team and forges a relationship with his half - brother Nathan Scott, while also coming to terms with who he is and who his father is . The season also explores the love lives of the boys as they develop relationships with characters like Peyton Sawyer, Haley James and Brooke Davis, while the parents of these teens must also face the past in order to move on from it . </P> <Table> <Tr> <Td> <H3> Regular (edit) </H3> <Ul> <Li> Chad Michael Murray as Lucas Scott (22 episodes) </Li> <Li> James Lafferty as Nathan Scott (22 episodes) </Li> <Li> Hilarie Burton as Peyton Sawyer (22 episodes) </Li> <Li> Bethany Joy Lenz as Haley James (22 episodes) </Li> <Li> Paul Johansson as Dan Scott (22 episodes) </Li> <Li> Sophia Bush as Brooke Davis (21 episodes) </Li> <Li> Barry Corbin as Whitey Durham (19 episodes) </Li> <Li> Craig Sheffer as Keith Scott (22 episodes) </Li> <Li> Moira Kelly as Karen Roe (18 episodes) </Li> <Li> Barbara Alyn Woods as Deb Scott (episode 13 onwards; recurring ep. 4 - 12) (19 episodes) </Li> </Ul> <P> </P> </Td> <Td> <H3> Recurring (edit) </H3> <Ul> <Li> Brett Claywell as Tim Smith (20 episodes) </Li> <Li> Bryan Greenberg as Jake Jagielski (13 episodes) </Li> <Li> Lee Norris as Mouth McFadden (12 episodes) </Li> <Li> Cullen Moss as Junk Moretti (7 episodes) </Li> <Li> Vaughn Wilson as Fergie Thompson (7 episodes) </Li> <Li> Antwon Tanner as Antwon "Skills" Taylor (6 episodes) </Li> <Li> Bevin Prince as Bevin Mirskey (6 episodes) </Li> <Li> Emmanuelle Vaugier as Nicki (6 episodes) </Li> <Li> Thomas Ian Griffith as Larry Sawyer (5 episodes) </Li> <Li> Sarah Edwards as Theresa (4 episodes) </Li> </Ul> <P> </P> </Td> </Tr> </Table>

How old are they in season 1 of one tree hill
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