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 Rachel Singer Sheila O'Brien Guest Star Angela Landis Kathy Guest Star Yvonne Zima Rachel Greene Guest Star Troy Evans Frank Martin Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Ken Davitian Zakar Papazian Guest Star Gloria Gifford Mrs. Wyatt Guest Star Gedde Watanabe Nurse Yosh Takata Guest Star Michael Crichton Executive Producer John Wells Executive Producer