Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross 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 Lisa Nicole Carson Guest Star Amy Aquino Dr. Janet Coburn Guest Star Larry Brandenburg Mr. Lensky Guest Star Ted Rooney Neonatologist Dr. Tabash Guest Star Jami Gertz Guest Star Maria Bello Dr. Anna Del Amico Guest Star Bill Marcus Mr. Biggers Guest Star Shashawnee Hall Detective Ford Guest Star Michael Crichton Executive Producer John Wells Executive Producer