Peter Gallagher Sandy Cohen Actor Ben McKenzie Ryan Atwood Actor Kelly Rowan Kirsten Cohen Actor Adam Brody Seth Cohen Actor Mischa Barton Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Alan Dale Actor Billy Campbell Guest Star Johnny Messner Guest Star Michael Cassidy Guest Star Logan Marshall-Green Guest Star Nikki Griffin Guest Star Aya Sumika Guest Star Marguerite Moreau Guest Star Tom Ohmer Guest Star Artie Baxter Guest Star Brandon Michael Vayda Guest Star Paull Walia Guest Star Kristin Cobb Guest Star Caitlin Kazepis Guest Star Jason Maxim Guest Star Leah McCormick Guest Star Eric McIntire Guest Star Zack Stewart Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer Tony Wharmby Director