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 Linda Lavin Guest Star Jaime King Guest Star T.I. Guest Star Bret Harrison Guest Star Billy Campbell Guest Star Anthony John Denison Guest Star Todd Sherry Guest Star Michael Cassidy Guest Star Logan Marshall-Green Guest Star Nikki Griffin Guest Star Krista Kalmus Guest Star Brian F. Durkin Actor Allen Reed Actor Burt Greenburg Guest Star Al Scheckwitz Guest Star Sid Raymond Guest Star Amie Dellavalle Guest Star Jason Bartley Guest Star Sajida Malik Guest Star Paul Aldanee Guest Star Hunt Baker Guest Star Anna Megan Becker Guest Star Josh Schwartz Executive Producer Doug Liman Executive Producer McG Executive Producer David Bartis Executive Producer Robert DeLaurentiis Executive Producer