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 Jeri Ryan Guest Star Autumn Reeser Taylor Townsend Guest Star Eric Mabius Guest Star Ryan Donowho Guest Star Kayla Ewell Guest Star Johnny Lewis Guest Star Rich Voll Guest Star Paul Ganus Guest Star Shawn Carter Peterson Guest Star Virginia Hamilton Guest Star DeVone Lawson Jr Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer