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 Abraham Benrubi Guest Star Angela Paton Mrs. Ransom Guest Star David Spielberg Dr. Neil Bernstein Guest Star Ellen Crawford Nurse Lydia Wright Guest Star Yvette Freeman Nurse Haleh Adams Guest Star Tom Everett Mr. Kazlaw Guest Star Austin O'Brien Kyle Kazlaw Guest Star Miriam Reichmeister Julia Kazlaw Guest Star Jonathan Hernandez Wilbur Guest Star Charles Cyphers Injured Civil-War Reenactor Guest Star Michael Crichton Executive Producer John Wells Executive Producer