Peter Gallagher Sandy Cohen Actor Ben McKenzie Ryan Atwood Actor Kelly Rowan Kirsten Cohen Actor Adam Brody Seth Cohen Actor Mischa Barton Actor Tate Donovan Actor Chris Carmack Guest Star Melinda Clarke Julie Cooper Actor Alan Dale Actor Rachel Bilson Summer Roberts Actor Christopher Cousins Guest Star Samaire Armstrong Guest Star Ruth Williamson Guest Star Ashley Hartman Guest Star Adam Grimes Guest Star Shailene Woodley Guest Star Barry Wiggins Guest Star Paul Witten Guest Star Milby Barron Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer