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 Melinda Clarke Julie Cooper Actor Chris Carmack Actor Rachel Bilson Summer Roberts Actor Alan Dale Actor Ashley Hartman Guest Star Adam Grimes Guest Star Josh Kloss Guest Star Shailene Woodley Guest Star Dwight Hicks Guest Star Steven M. Gagnon Guest Star Carrie Armstrong Guest Star Josh Schwartz Executive Producer Doug Liman Director McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer Allan Heinberg Writer