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 Glenn Plummer Timmy Rawlins Guest Star Sam Anderson Dr. Jack Kayson Guest Star John Marshall Jones Mr. Gaither Guest Star Neil Giuntoli Alan Guest Star John Doolittle Mr. Desmond Guest Star William H. Macy Guest Star Ving Rhames Walter Robbins Guest Star Beah Richards Mae Benton Guest Star Ming-Na Wen Jing-Mei Chen Guest Star Marco Rodríguez Serena, Customs Agent Guest Star Sam Scarber Mr. Parnell Guest Star