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 Omar Epps Guest Star Glenne Headly Guest Star Michael Beach Guest Star Jorja Fox Dr. Maggie Doyle Guest Star Wilson Raiser Frankenstein Guest Star Lauren Robinson Tina Hargrove Guest Star Kirsten Dunst Charlie Chiemingo Guest Star Gina Gallego Instructor Guest Star Laura Cerón Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Ernest Perry Jr. Gus, Healthmobile Driver Guest Star Emily Wagner Doris Pickman Guest Star Michael Crichton Executive Producer John Wells Executive Producer