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 Caitlin FitzGerald Dr. Gretchen Kerr Guest Star Patrick Fischler CDC DD Gareth Reddick Guest Star Ron Perkins Bill Chislett Guest Star Emily Alyn Lind Ariel Guest Star Mark Famiglietti Jeremy Weeb Guest Star Alicia Urizar Alicia Dias Guest Star Caitlin Harris Anna Chislett Guest Star Ramses Jimenez Raul Gomez Guest Star Angela Relucio Risa Park Guest Star Jeffrey Larson Private Kyle Elkin Guest Star Greg Mills News Reporter Guest Star Michael Seitzman Executive Producer, Director David Semel Executive Producer Ryan McGarry Executive Producer Marti Noxon Executive Producer Linda Goldstein Knowlton Executive Producer Jessica Ball Writer Julian Meiojas Writer