Anthony Edwards Dr. Mark Greene Actor Eriq La Salle Dr. Peter Benton Actor Noah Wyle Dr. John Carter Actor Julianna Margulies Head Nurse Carol Hathaway Actor Gloria Reuben Jeanie Boulet Actor Laura Innes Dr. Kerry Weaver Actor Alex Kingston Dr. Elizabeth Corday Actor Kellie Martin Lucy Knight Actor Goran Visnjic Dr. Luka Kovac Actor Michael Michele Cleo Finch Actor Maura Tierney Abby Lockhart Actor Ming-Na Wen Actor Paul McCrane Robert Romano Actor Kelsi Degregorio Laura Williams Guest Star Kayli Degregorio Laura Williams Guest Star Cara DeLizia Andrea Parks Guest Star Judy Parfitt Iasbelle Corday Guest Star John Cullum David Greene Guest Star Christopher Rich Ron Perth Guest Star Gwynyth Walsh Barbara Knight Guest Star Andrew Bowen Andrew Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Jackie Debatin Judy Guest Star Michael Crichton Executive Producer John Wells Executive Producer