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 Jordan Baker Guest Star Logan Marshall-Green Guest Star Christopher Backus Guest Star Shaun Cozzens Guest Star Jeff Witzke Guest Star Caitlin Kazepis Guest Star Sara Holden Guest Star Jarod Scott Guest Star Johnny Torres Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer