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 Christine Elise Guest Star Ron Rifkin Guest Star Laura Innes Dr. Kerry Weaver Guest Star Abraham Benrubi Guest Star Megan Gallagher Kathy Snyder Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Josette DiCarlo Mrs. D'Angelo Guest Star Jonah Rooney Ray Guest Star Lisa Waltz Mrs. Wimbur Guest Star Michael Crichton Executive Producer John Wells Executive Producer