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 Samaire Armstrong Guest Star Taylor Handley Guest Star Alan Dale Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Chris Carmack Guest Star Rosalind Chao Guest Star Kevin West Guest Star Bret Harrison Guest Star Joe Howard Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer