Goran Visnjic Dr. Luka Kovac Actor Maura Tierney Abby Lockhart Actor Mekhi Phifer Dr. Gregory Pratt Actor Parminder Nagra Dr. Neela Rasgotra Actor Linda Cardellini Nurse Samantha Taggart Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor Ernie Hudson Colonel James Gallant Guest Star Sheryl Lee Ralph Gloria Gallant Guest Star Armand Assante Richard Elliot Guest Star China Shavers Olivia Evans Guest Star Abraham Benrubi Jerry Markovic Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Troy Evans Frank Martin Guest Star Montae Russell Dwight Zadro Guest Star Christopher Amitrano Officer Hollis Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer