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 Lisa Nicole Carson Guest Star Omar Epps Guest Star John Aylward Guest Star Mena Suvari Laura-Lee Armitage Guest Star Brian Wimmer Mickey Guest Star Lisa Darr Nadine Wilkes Guest Star Allison Mackie Claire Wilkes Guest Star Yvette Freeman Guest Star Ellen Crawford Guest Star Rose Gregorio Helen Hathaway Guest Star Jane Daly Diane Armitage Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Vanessa Marquez Nurse Wendy Goldman Guest Star Charles Noland E-Ray Guest Star Michael Crichton Executive Producer John Wells Executive Producer