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 Tate Donovan Guest Star Jeri Ryan Guest Star Eric Mabius Guest Star Autumn Reeser Taylor Townsend Guest Star Michael Adler Guest Star Blake Robbins Guest Star Jennifer Parsons Guest Star Jason Carroll Guest Star Jason Maxim Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer