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 Djimon Hounsou Actor Connie Sawyer Kathy Brennan Guest Star Sheila Kelley Coco Robbins Guest Star Abraham Benrubi Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Anna Gunn Ekabo's Lawyer Guest Star Matthew Faison Dr. Weinstein, cardiothoracic surgeon Guest Star Gina Hecht Radiology Tech Guest Star Peter Ratray Dr. Sedowenski Guest Star Michael Crichton Executive Producer John Wells Executive Producer