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 Currie Graham James Guest Star Ewan McGregor Duncan Stewart Guest Star Mason Gamble Robert Potter Guest Star Ruth Maleczech Marita Novotny Guest Star Jan Rubes Mr. Duzak Guest Star Marisol Nichols Angie Guest Star Nathan Davis Mr. Novotny Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Mark Morettini Lockhart Guest Star Michael Crichton Executive Producer John Wells Executive Producer