Peter Gallagher Sandy Cohen Actor Ben McKenzie Ryan Atwood Actor Kelly Rowan Kirsten Cohen Actor Adam Brody Seth Cohen Actor Mischa Barton Actor Tate Donovan Actor Chris Carmack Guest Star Navi Rawat Guest Star Alan Dale Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Amanda Righetti Guest Star Kristen Renton Guest Star Kevin Rankin Guest Star Gwendoline Yeo Guest Star Jerry Schumacher Guest Star David Rountree Guest Star Christopher Showerman Guest Star Natalie Blalock Guest Star Lorenzo Aranda Guest Star Gerald Fish Guest Star John J Encinio Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Allan Heinberg Writer