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 Nikki Reed Guest Star Cam Gigandet Guest Star Shaun Duke Moosekian Guest Star Michael Nouri Guest Star Sven Holmberg Guest Star JD Pardo Guest Star Patty Onagan Guest Star Jonathon Trent Guest Star Ramlah Frediani Guest Star Don Perry Guest Star Garrison Koch Guest Star Mark Hames Guest Star Chris Kerner Guest Star Brandon Stacy Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer