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 Kellie Martin Lucy Knight Actor Nicolette Little Corinna Nelson Guest Star John Thaddeus Keith Nelson Guest Star Julie Bowen Roxanne Please Guest Star David Brisbin Dr. Alexander Babcock Guest Star Bellina Logan Nurse Kit Guest Star Kathe E. Mazur Mrs. Nelson Guest Star Rich Komenich Car Dealer Guest Star John Aylward Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Michael Crichton Executive Producer John Wells Executive Producer