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 Ryan Donowho Guest Star Lisa Rotundi Guest Star Andrea Pearson Guest Star Jeff Hepner Guest Star Jeremy Brandt Guest Star Tiffany Thornton Guest Star Adam Donshik Guest Star Kesler Casimir Guest Star Sarah Christine Smith Guest Star Robert Mammana Guest Star Dana Davis Guest Star Gina Fricchione Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer