Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross Actor Sherry Stringfield Dr. Susan Lewis 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 Matthew Glave Guest Star Jenny O'Hara Nurse Rhonda Sterling Guest Star Dwier Brown Dr. David Herlihy Guest Star Cecil Hoffman Gail Herlihy Guest Star William Sanderson Mr. Percy Guest Star Sab Shimono Dr. Okida Guest Star Ellen Crawford Guest Star Yvette Freeman Guest Star Kathleen Freeman Rhonda's Patient Guest Star Bellina Logan Nurse Kit Guest Star Joan McMurtrey Birdwatcher Guest Star Michael Crichton Executive Producer John Wells Executive Producer