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 Rachel Bilson Summer Roberts Actor Alan Dale Actor Melinda Clarke Julie Cooper Actor Chris Carmack Guest Star Shailene Woodley Guest Star Josh Kloss Guest Star Kelly McCracken Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer Michael Fresco Director Allan Heinberg Writer