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 Rosalind Chao Guest Star Bonnie Somerville Guest Star Samaire Armstrong Guest Star Melinda Clarke Julie Cooper Actor Alan Dale Actor Rachel Bilson Summer Roberts Actor Chris Carmack Guest Star Josh Kloss Guest Star Eric Allan Kramer Guest Star Ashley Hartman Guest Star Melissa Strom Guest Star Sarah Carrol Guest Star Adam Vanderwielen Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer