Mekhi Phifer Dr. Gregory Pratt Actor Maura Tierney Abby Lockhart Actor Linda Cardellini Nurse Samantha Taggart Actor Goran Visnjic Dr. Luka Kovac Actor Parminder Nagra Dr. Neela Rasgotra Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor Callie Thorne Jodie Kenyon Guest Star Ally Walker Fran Bevens Guest Star James Woods Dr. Nate Lennox Guest Star Leland Orser Dr. Lucien Dubenko Guest Star John Aylward Dr. Donald Anspaugh Guest Star Roger Aaron Brown Dr. Jared Ames Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer