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 Mare Winningham Dr. Amanda Lee Guest Star Anne Pitoniak Ruth Johnson Guest Star Julie Bowen Roxanne Please Guest Star Matthew Glave Dr. Dale Edson Guest Star Sam Anderson Dr. Jack Kayson Guest Star Cress Williams Officer Reggie Moore Guest Star Xander Berkeley Detective Wilson Guest Star Bellina Logan Nurse Kit Guest Star Viveka Davis Gilda Bernucci Guest Star Michael Crichton Executive Producer John Wells Executive Producer