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 Garret Dillahunt Steve Curtis Guest Star Natasha Gregson Wagner Amry Warner Guest Star Michael Weston Rafe Hendricks Guest Star Dominic Janes Alex Taggart Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Amy Aquino Dr. Janet Coburn Guest Star Abraham Benrubi Jerry Markovic Guest Star Maury Sterling Dr. Nelson Guest Star Estelle Harris Mrs. Markovic Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Troy Evans Frank Martin Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer