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 Myndy Crist Valerie Page Guest Star Kente Scott Taylor Sparks Guest Star Emile Hirsch Chad Kottmeier Guest Star Lawrence Monoson Dean Rollins Guest Star Paul Adelstein Hank Loman Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star David Brisbin Dr. Alexander Babcock Guest Star David Byrd Howard Waller Guest Star Christopher Cass Santa Greg Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Michael Crichton Executive Producer John Wells Executive Producer