Peter Gallagher Sandy Cohen Actor Benjamin 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 Michael Nouri Guest Star Jeff Hephner Guest Star Morena Baccarin Guest Star Nikki Reed Guest Star Cam Gigandet Guest Star Autumn Reeser Taylor Townsend Guest Star Rodney Rowland Guest Star Marc Vann Guest Star Chase Kim Guest Star Stacey Hinnen Guest Star Bella Carlson Guest Star Chloe Carlson Guest Star Andy Mackenzie Guest Star Jason Maxim Guest Star Ryan Donowho Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer