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, Director 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 Judy Parfitt Isabelle Corday Guest Star David Krumholtz Paul Sobriki Guest Star Lenny Wolpe Dr. George Hudson Guest Star Anton Yelchin Robbie Edelstein Guest Star Megan Corletto Julia Edelstein Guest Star Amzie Strickland Jean Connelly Guest Star John Cullum David Greene Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star David Brisbin Dr. Alexander Babcock Guest Star Michael Crichton Executive Producer John Wells Executive Producer