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 Alan Dale Actor Rachel Bilson Summer Roberts Actor Melinda Clarke Julie Cooper Actor Paris Hilton Guest Star Colin Hanks Guest Star Chris Carmack Guest Star Amanda Righetti Guest Star Al Sapienza Guest Star John David Conti Guest Star Stu "Large" Riley Guest Star Steffany Huckaby Guest Star Gilles Marini Guest Star Casey Nelson Guest Star Mary Castro Guest Star Hans Raith Guest Star Emily VanSonnenberg Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer