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 Jeff Hephner Guest Star Cam Gigandet Guest Star Autumn Reeser Taylor Townsend Guest Star Shaun Duke Moosekian Guest Star Garrett M. Brown Guest Star Nicole Garza Guest Star Daphne Ashbrook Guest Star Erin Foster Guest Star JD Pardo Guest Star Perry Anzilotti Guest Star Jonathon Trent Guest Star Steve Seagren Guest Star Blake Gibbons Guest Star Reese Riley Guest Star Preston James Hillier Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer