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 John Aylward Guest Star Lisa Nicole Carson Guest Star Abraham Benrubi Guest Star Mariska Hargitay Guest Star Michael Beach Guest Star Caitlin Dulany Heather Morgan Guest Star Danielle Harris Laura Quentin Guest Star Michael Jace Bill Nelson Guest Star Connie Ray Glenda Guest Star Ted Rooney Neonatologist Dr. Tabash Guest Star Daniel Quinn Casey Guest Star Richard Grove Ed Guest Star Tim Quill Josh Torren Guest Star Michael Crichton Executive Producer John Wells Executive Producer