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 Allen Dale Guest Star Rachel Bilson Summer Roberts Actor Alan Dale Actor Melinda Clarke Julie Cooper Actor Chris Carmack Guest Star Brian McNamara Guest Star Kim Oja Guest Star Kevin West Guest Star Kate Rodger Guest Star Katherine Disque Guest Star Danielle Bisutti Guest Star Austin Dolan Guest Star Shane Haboucha Guest Star Rand Holdren Guest Star J. J. Dashnaw Guest Star Ryan Bundra Guest Star Nick Bundra Guest Star Gregory Zarian Gus Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer