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 Julie Carmen Mrs. Lafferty Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Khandi Alexander Jackie Robbins Guest Star Christine Harnos Guest Star Andrea Parker Linda Farrell Guest Star Valerie Perrine Cookie Lewis Guest Star CCH Pounder Dr. Angela Hicks Guest Star Gloria Reuben Jeanie Boulet Guest Star Kathleen Wilhoite Chloe Lewis Guest Star Lisa Zane Diane Leeds Guest Star Michael Crichton Executive Producer John Wells Executive Producer