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 Abraham Benrubi Jerry Markovic Guest Star Rick Rossovich Dr. John 'Tag' Taglieri Guest Star Andrea Parker Linda Farrell Guest Star Michael Bowen Boy's Father Guest Star Cynthia Ettinger Mrs. Powell Guest Star Priscilla Pointer Mrs. Abernathy Guest Star Rosemary Clooney Mary Cavanaugh, 'Madame X' Guest Star Kathleen Wilhoite Chloe Lewis Guest Star CCH Pounder Dr. Angela Hicks Guest Star Malgoscha Gebel Dr. Bogdanilivestsky 'Bob' Romansky Guest Star Jason Edwards Santa Guest Star Curtis Blanck Murry Guest Star