Peter Gallagher Sandy Cohen Actor Ben McKenzie Ryan Atwood Actor Kelly Rowan Kirsten Cohen Actor Adam Brody Seth Cohen Actor Mischa Barton Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Alan Dale Actor Willa Holland Kaitlin Cooper Guest Star Ryan Donowho Guest Star Michael Nouri Guest Star Jeff Hephner Guest Star Robert Picardo Guest Star Andrea Pearson Guest Star Chris Kerner Guest Star Aurelie Kyinn Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer