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 Glenne Headly Guest Star Jorja Fox Dr. Maggie Doyle Guest Star Michael Beach Guest Star Ellen Crawford Guest Star Mike Genovese Guest Star Kirsten Dunst Charlie Chiemingo Guest Star Lisa Nicole Carson Guest Star Dwier Brown Dr. David Herlihy Guest Star Cecil Hoffman Gail Herlihy Guest Star Deborah May Mary Cain Guest Star Yvette Freeman Guest Star Fran Bennett Phyllis Guest Star Harris Laskawy Siebert Guest Star Georgienne Millen Reeva Guest Star Buck Kartalian Lloyd Frick Guest Star Michael Crichton Executive Producer John Wells Executive Producer