Marcia Gay Harden Dr. Leanne Rorish Actor Boris Kodjoe Dr. Will Campbell Actor Harry Ford Dr. Angus Leighton Actor Benjamin Hollingsworth Dr. Mario Savetti Actor William Allen Young Dr. Rollie Guthrie Actor Luis Guzmán Jesse Sallander Actor Rob Lowe Col. Ethan Willis Actor Emily Tyra Dr. Noa Kean Actor Noah Gray-Cabey Dr. Elliot Dixon Actor Emily Alyn Lind Ariel Actor Moon Bloodgood Rox Valenzuela Actor Taylor Handley Robert Guest Star Tyler Perez Diego Avila Guest Star Patrick Fabian Owen Edwards Guest Star Alex Fernandez Dr. Oscar Avila Guest Star Shannon Kane Felicia Humphries Guest Star Stephanie Lemelin Keri Berlinger Guest Star Kathleen York Vicky Markwith Guest Star Andy Umberger General Jefferson Cohn Guest Star Sean O'Bryan Dr. Edlen Guest Star James Eckhouse Mr. Berlinger Guest Star Jennifer Hetrick Mrs. Berlinger Guest Star Samaire Armstrong Tabitha Markwith Guest Star Laya DeLeon Hayes Emily Campbell Guest Star Miles Burris Logan Guest Star Angela Relucio Risa Park Guest Star Janeline Hayes Nurse Guest Star Dougald Park Suit Guest Star Terrence Edwards Paramedic 1 Guest Star Johnny Kostrey Paramedic 2 Guest Star Aris Mendoza Paramedic 3 Guest Star Michael Seitzman Executive Producer David Semel Executive Producer Ryan McGarry Executive Producer Marti Noxon Executive Producer Linda Goldstein Knowlton Executive Producer