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 Joel de la Fuente Med Student Ivan Fu Guest Star Coby Bell Brett Nicholson Guest Star Michael Beach Guest Star Justin Henry Med Student James Sasser Guest Star Sam Vlahos Pablo Guest Star David Green Alan Guest Star Jackie Mari Roberts Ms. Davis Guest Star Mariska Hargitay Guest Star Joe Torry Chris Law Guest Star Michael Horton Tom Angevine Guest Star Rick Overton Mr. McNamara Guest Star Michael Crichton Executive Producer John Wells Executive Producer