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 Abraham Benrubi Jerry Markovic Guest Star Amy Aquino Dr. Janet Coburn Guest Star Dennis Lipscomb Dr. Wilson Guest Star Ming-Na Wen Jing-Mei Chen Guest Star Beah Richards Mae Benton Guest Star Khandi Alexander Jackie Robbins Guest Star Colleen Flynn Jodi O'Brien Guest Star Bradley Whitford Sean O'Brien Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star