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 Tyler Perez Diego Avila Guest Star Angela Relucio Nurse Risa Park Guest Star Rosalind Chao Jae Eun Guest Star Josh Braaten JT, Frank Guest Star Michael Ocampo Sean Guest Star Shanti Lowry Yvonne FKA Tiffany Guest Star Braylon Owens Dominic Guest Star Dominic Owens Dominic Guest Star Courtney Lakin Helena Guest Star Guy Wilson Ranger Guest Star Graham Shiels Malloy Guest Star Carolyn Michelle Smith Vasser Guest Star Joshua Katz Paramedic 1 Guest Star Richard Vetter JT, Frank Photo Double 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 Nicole Rubio Director