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 Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Alan Dale Actor Michael Cassidy Guest Star Olivia Wilde Guest Star Shannon Lucio Guest Star Nicholas Gonzalez Guest Star John F. Beach Guest Star George Contreras Guest Star Dejon Mayes Guest Star Veronique Vicari Guest Star Modest Mouse Music Performer Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer