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 Andrea Parker Linda Farrell Guest Star Malgoscha Gebel Dr. Bogdanilivestsky 'Bob' Romansky Guest Star Abraham Benrubi Jerry Markovic Guest Star CCH Pounder Dr. Angela Hicks Guest Star Scott Jaeck Dr. Steven Flint Guest Star Kevin Michael Richardson Patrick Guest Star Christian Coleman Mookie 'Slice' James Guest Star Alix Elias Roxanne Guest Star Lorinne Vozoff Marguerite Guest Star Angela Bassett Actor Michael Crichton Writer