<P> This season focuses on the first half of senior year at Tree Hill High School . Starting three months after the second season finale, Haley returns to Tree Hill and tries to save her marriage with Nathan . Peyton gets to know her birth mother . Lucas and Brooke begin a relationship . Keith and Karen get engaged . Nathan patches things up with Lucas, while Mouth begins a complicated relationship with newcomer Rachel, who also spreads a lot of drama through the core characters . After a shooting at the school things between Lucas and Peyton heat up despite Peyton's proposal to Jake . </P> <Table> <Tr> <Td> <H3> Regular (edit) </H3> <Ul> <Li> Chad Michael Murray as Lucas Scott (21 episodes) </Li> <Li> James Lafferty as Nathan Scott (22 episodes) </Li> <Li> Hilarie Burton as Peyton Sawyer (22 episodes) </Li> <Li> Bethany Joy Galeotti as Haley James Scott (22 episodes) </Li> <Li> Paul Johansson as Dan Scott (20 episodes) </Li> <Li> Sophia Bush as Brooke Davis (22 episodes) </Li> <Li> Barbara Alyn Woods as Deb Scott (13 episodes) </Li> <Li> Lee Norris as Mouth McFadden (18 episodes) </Li> <Li> Barry Corbin as Whitey Durham (12 episodes) </Li> <Li> Craig Sheffer as Keith Scott (13 episodes) </Li> <Li> Moira Kelly as Karen Roe (20 episodes) </Li> </Ul> </Td> <Td> <H3> Recurring (edit) </H3> <Ul> <Li> Danneel Harris as Rachel Gatina (19 episodes) </Li> <Li> Bevin Prince as Bevin Mirskey (16 episodes) </Li> <Li> Tyler Hilton as Chris Keller (12 episodes) </Li> <Li> Sheryl Lee as Ellie Harp (8 episodes) </Li> <Li> Vaughn Wilson as Fergie Thompson (7 episodes) </Li> <Li> Antwon Tanner as Antwon "Skills" Taylor (7 episodes) </Li> <Li> Cullen Moss as Junk Moretti (6 episodes) </Li> <Li> Kevin Kilner as Larry Sawyer (6 episodes) </Li> <Li> Brett Claywell as Tim Smith (5 episodes) </Li> <Li> Kelsey Chow as Gigi Silveri (5 episodes) </Li> <Li> Shawn Shepard as Principal Turner (4 episodes) </Li> </Ul> </Td> <Td> <H3> Guest Cast (edit) </H3> <Ul> <Li> Michael Trucco as Cooper Lee (3 episodes) </Li> <Li> Bryan Greenberg as Jake Jagielski (3 episodes </Li> <Li> Colin Fickes as Jimmy Edwards (2 episodes) </Li> <Li> Amber Wallace as Glenda Farrell (1 episode) </Li> <Li> Allison Scagliotti as Abigail "Abby" Brown (1 episode) </Li> </Ul> </Td> </Tr> </Table> <Tr> <Td> <H3> Regular (edit) </H3> <Ul> <Li> Chad Michael Murray as Lucas Scott (21 episodes) </Li> <Li> James Lafferty as Nathan Scott (22 episodes) </Li> <Li> Hilarie Burton as Peyton Sawyer (22 episodes) </Li> <Li> Bethany Joy Galeotti as Haley James Scott (22 episodes) </Li> <Li> Paul Johansson as Dan Scott (20 episodes) </Li> <Li> Sophia Bush as Brooke Davis (22 episodes) </Li> <Li> Barbara Alyn Woods as Deb Scott (13 episodes) </Li> <Li> Lee Norris as Mouth McFadden (18 episodes) </Li> <Li> Barry Corbin as Whitey Durham (12 episodes) </Li> <Li> Craig Sheffer as Keith Scott (13 episodes) </Li> <Li> Moira Kelly as Karen Roe (20 episodes) </Li> </Ul> </Td> <Td> <H3> Recurring (edit) </H3> <Ul> <Li> Danneel Harris as Rachel Gatina (19 episodes) </Li> <Li> Bevin Prince as Bevin Mirskey (16 episodes) </Li> <Li> Tyler Hilton as Chris Keller (12 episodes) </Li> <Li> Sheryl Lee as Ellie Harp (8 episodes) </Li> <Li> Vaughn Wilson as Fergie Thompson (7 episodes) </Li> <Li> Antwon Tanner as Antwon "Skills" Taylor (7 episodes) </Li> <Li> Cullen Moss as Junk Moretti (6 episodes) </Li> <Li> Kevin Kilner as Larry Sawyer (6 episodes) </Li> <Li> Brett Claywell as Tim Smith (5 episodes) </Li> <Li> Kelsey Chow as Gigi Silveri (5 episodes) </Li> <Li> Shawn Shepard as Principal Turner (4 episodes) </Li> </Ul> </Td> <Td> <H3> Guest Cast (edit) </H3> <Ul> <Li> Michael Trucco as Cooper Lee (3 episodes) </Li> <Li> Bryan Greenberg as Jake Jagielski (3 episodes </Li> <Li> Colin Fickes as Jimmy Edwards (2 episodes) </Li> <Li> Amber Wallace as Glenda Farrell (1 episode) </Li> <Li> Allison Scagliotti as Abigail "Abby" Brown (1 episode) </Li> </Ul> </Td> </Tr> <Ul> <Li> Chad Michael Murray as Lucas Scott (21 episodes) </Li> <Li> James Lafferty as Nathan Scott (22 episodes) </Li> <Li> Hilarie Burton as Peyton Sawyer (22 episodes) </Li> <Li> Bethany Joy Galeotti as Haley James Scott (22 episodes) </Li> <Li> Paul Johansson as Dan Scott (20 episodes) </Li> <Li> Sophia Bush as Brooke Davis (22 episodes) </Li> <Li> Barbara Alyn Woods as Deb Scott (13 episodes) </Li> <Li> Lee Norris as Mouth McFadden (18 episodes) </Li> <Li> Barry Corbin as Whitey Durham (12 episodes) </Li> <Li> Craig Sheffer as Keith Scott (13 episodes) </Li> <Li> Moira Kelly as Karen Roe (20 episodes) </Li> </Ul>

Who opened the time capsule one tree hill