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 Alan Dale Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Amanda Righetti Guest Star Michael Cassidy Guest Star Nicholas Gonzalez Guest Star Bruno Amato Guest Star Michelle Hurd Guest Star Greg Callahan Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer Allan Heinberg Writer