Marcia Gay Harden Dr. Leanne Rorish Actor Boris Kodjoe Dr. Will Campbell Actor Melanie Chandra Dr. Malaya Pineda Actor Harry Ford Dr. Angus Leighton Actor Benjamin Hollingsworth Dr. Mario Savetti Actor Jillian Murray Dr. Heather Pinkney Actor William Allen Young Dr. Rollie Guthrie Actor Luis Guzmán Jesse Sallander Actor Rob Lowe Col. Ethan Willis Actor Noah Gray-Cabey Dr. Elliot Dixon Guest Star Emily Tyra Dr. Noa Kean Guest Star Angela Relucio Risa Park Guest Star Meg Chambers Steedle Dr. Kelly Pruitt Guest Star Mark Famiglietti Jeremy Weeb Guest Star Ron Perkins Bill Chislett Guest Star Tom Williamson Russell Danvers, Raul Gomez Guest Star, Guest Star Sundra Oakley Regina Guest Star Gabriela Banus Yolanda Ramos Guest Star Don McManus Exorcist Guest Star Alicia Urizar Alicia Dias Guest Star Caitlin FitzGerald Dr. Gretchen Kerr Guest Star Caitlin Harris Anna Chislett Guest Star Patrick Fischler CDC DD Gareth Reddick Guest Star Jeffrey Larson Private Kyle Elkin Guest Star Emily Alyn Lind Ariel Guest Star Michael Seitzman Executive Producer David Semel Executive Producer Ryan McGarry Executive Producer Marti Noxon Executive Producer Linda Goldstein Knowlton Executive Producer Corey Evett Writer Matthew S. Partney Writer David Von Ancken Director