Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross 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 Maria Bello Dr. Anna Del Amico Actor Swoosie Kurtz Tina Marie Chambliss Guest Star Gary Grubbs Emmet Chambliss Guest Star Erica Gimpel Adele Newman Guest Star Sam Vlahos Pablo Guest Star Taylor Nichols Mr. Adams Guest Star Kenneth Tigar Dr. Keinholz Guest Star Amanda Wyss Mrs. Adams Guest Star John Aylward Guest Star Paul McCrane Robert Romano Guest Star Tom Troupe Tancred Baumgartner Guest Star Michael Crichton Executive Producer John Wells Executive Producer