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 Jeri Ryan Guest Star Autumn Reeser Taylor Townsend Guest Star Ryan Donowho Guest Star Kayla Ewell Guest Star Johnny Lewis Guest Star Rob Brownstein Guest Star Cam Gigandet Guest Star Jeff Hephner Guest Star Paula Trickey Guest Star Mitchell Fink Guest Star Tyson Chambers Guest Star Chrissy Conway Guest Star Daniel Colletti Guest Star Logan Marshall-Green Guest Star Derek Selander Guest Star Cal Thomas Guest Star Craig Allen Wolf Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer