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 Paul McCrane Robert Romano Actor Martha Plimpton Meg Corwin Guest Star Alan Alda Dr. Gabriel Lawrence Guest Star Amzie Strickland Jean Connelly Guest Star Tom McGowan Joe Bernero Guest Star Rebecca De Mornay Elaine Nichols 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 Lily Mariye Nurse Lily Jarvik Guest Star Michael Crichton Executive Producer John Wells Executive Producer