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 John Leguizamo Dr. Victor Clemente Guest Star Sharif Atkins Dr. Michael Gallant Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Kat Dennings Zoe Butler Guest Star Harve Presnell Mr. Venema Guest Star Abraham Benrubi Jerry Markovic Guest Star Jordan Calloway K.J. Thibeaux Guest Star Christopher Amitrano Officer Hollis Guest Star Rochelle Aytes Tamara Guest Star Jillian Bach Penny Nicholson Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer