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 Christine Harnos Guest Star Abraham Benrubi Jerry Markovic Guest Star Tyra Ferrell Dr. Sarah Langworthy Guest Star Rick Rossovich Dr. John 'Tag' Taglieri Guest Star Andrea Parker Linda Farrell Guest Star William H. Macy Guest Star Kathleen Wilhoite Chloe Lewis Guest Star John Terry Dr. David 'Div' Cvetic Guest Star Pierre Epstein Dr. Bradley Guest Star Christian Coleman Mookie 'Slice' James Guest Star Mike Genovese Officer Al Grabarsky Guest Star