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 Alan Alda Dr. Gabriel Lawrence Guest Star Rebecca De Mornay Elaine Nichols Guest Star Martha Plimpton Meg Corwin Guest Star Jessica Sara Robin Burke Guest Star Erik Palladino Dave Malucci Guest Star Jesse Head Tommy Stevens Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Kristin Minter Randi Fronczak Guest Star Gedde Watanabe Nurse Yosh Takata Guest Star George Clooney Actor Michael Crichton Executive Producer John Wells Executive Producer