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 Allison Gabriel Nancy Guest Star Caitlin Reagan Jolene Guest Star Alex Lange Max Edwards Guest Star Brad Ashten Jimmy Guest Star Diamond White Off-Camera Singer, Caitlyn Quick Guest Star Joe Pingue Cliff Abbott Guest Star Colleen Foy Melanie Guest Star Shannon Kane Felicia Humphries Guest Star Rosalind Chao Jae Eun Guest Star Shirley Jordan Maisy 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 Diana Valentine Director