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 Alex Kingston Dr. Elizabeth Corday Actor Maria Bello Dr. Anna Del Amico Actor Mariska Hargitay Guest Star Frances Sternhagen Millicent Carter Guest Star Brent Jennings Nat Guest Star Chad Lowe George Henry Guest Star Bellina Logan Nurse Kit Guest Star Sam Vlahos Pablo Guest Star Natalie Core Mrs. Larkin Guest Star Leland Crooke Bart Guest Star Rick Hall Detective in Larkin Case Guest Star Lauren Hodges Gina Guest Star Kathleen Lloyd Dr. Mack Guest Star Stacey Travis Det. Weller Guest Star Michael Crichton Executive Producer John Wells Executive Producer