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 Michael Cassidy Guest Star Olivia Wilde Guest Star Shannon Lucio Guest Star Nicholas Gonzalez Guest Star Kathleen York Guest Star Alan Dale Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Chriss Anglin Guest Star Monika Jolly Guest Star Camille Langfield Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer Ian Toynton Director