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 Angela Relucio Nurse Rita Park Guest Star David Clennon Colonel Martin Willis Guest Star Alex Lange Max Edwards Guest Star Patrick Fabian Owen Guest Star Theo Breaux Paramedic Guest Star Nick Jandl Edwin Guest Star Melanie Field Kathy Guest Star Dawn Frances Tanya Guest Star McNally Sagal Karen Chandler Guest Star Corinne Chooey Lila Guest Star Christian Monzon Damon Guest Star Christa B. Allen Amber Guest Star Elizabeth McLaughlin Lana Guest Star Maggie Contreras Doctor Guest Star Joshua Katz Paramedic 2 Guest Star Michael Seitzman Executive Producer David Semel Executive Producer Ryan McGarry Executive Producer Marti Noxon Executive Producer Linda Goldstein Knowlton Executive Producer David Marshall Grant Writer Doug Hannah Director