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 Glenne Headly Guest Star Dwier Brown Dr. David Herlihy Guest Star Cecil Hoffman Gail Herlihy Guest Star Jenny O'Hara Nurse Rhonda Sterling Guest Star Ellen Crawford Guest Star Bellina Logan Nurse Kit Guest Star Anna Berger Mr. Brazil's Caregiver Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Guest Star Kristin Minter Randi Fronczak Guest Star Michael Crichton Executive Producer John Wells Executive Producer