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 Angela Relucio Risa Park Guest Star Penn Jillette Johnny Prentiss Guest Star Sarah Lancaster Julia Guest Star Benjamin Ciaramello Tim Baldwin Guest Star Sam Adegoke Erick Hawkins Guest Star Alice Hunter Fiona Burnside Guest Star Tim Chiou Lt. Jeff Reese Guest Star Meredith Roberts Quill Karen Chapman Guest Star Joshua Weinstein Xander Westin Guest Star Nico David Ronny Clark Guest Star Matt Medrano Officer Alvarez Guest Star Rodrigo Rojas Tony Hall Guest Star Theo Breaux Paramedic 1 Guest Star Joshua Keller Katz Paramedic 2 Guest Star Juan Alfonso 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 Julian Meiojas Writer Rob J. Greenlea Director