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 Sharif Atkins Dr. Michael Gallant Guest Star John Leguizamo Dr. Victor Clemente Guest Star Kristen Johnston Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Kat Dennings Zoe Butler Guest Star C. Thomas Howell Vincent Jansen 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 Juliette Goglia Sydney Carlyle Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer