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 Michael Cassidy Guest Star Olivia Wilde Guest Star Shannon Lucio Guest Star Nicholas Gonzalez Guest Star Jordan Baker Guest Star Devin Sidell Guest Star Stephon Fuller Guest Star Michael Bailey Smith Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer