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 Michael Cassidy Guest Star Logan Marshall-Green Guest Star Kim Oja Guest Star Danielle Bisutti Guest Star Frank Crim Guest Star Kyle Bornheimer Guest Star Jon Ryckman Guest Star Caitlin Kazepis Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer