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 Michele Morgan Allison Beaumont Guest Star John Aylward Guest Star William H. Macy Guest Star Badja Djola Mike Lembreaux Guest Star Art LaFleur Miles Kearney Guest Star Marc Lawrence Mr. Newton Guest Star Mike Genovese Officer Al Grabarsky Guest Star Tony Abatemarco Loan Officer Guest Star Renee Faia Brianna Thomas Guest Star John Hostetter The Younger Mr. Newton Guest Star Cristine Rose Mrs. Martinez Guest Star Michael Crichton Executive Producer John Wells Executive Producer