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 Ryan Donowho Guest Star Michael Nouri Guest Star Blair Hickey Guest Star Juan Ramirez Guest Star Nicklaus Koeppen Guest Star Lisa Rotondi Guest Star Linda Lavin Guest Star Erik Valdez Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer