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 Michael Beach Guest Star Dan Hedaya Herb Spivak Guest Star Hill Harper Mr. Jackson Guest Star Megan Cavanagh Darlene Guest Star John P. Connolly Officer Billy Guest Star Kevin Jackson Harold Percy Guest Star Jack Kehler Jail Officer Guest Star James Lashly Eddie Guest Star Mindy Seeger Barbara Leeman Guest Star Jonathan Scarfe Chase Carter Guest Star Christine Harnos Jennifer Greene Guest Star Mariska Hargitay Guest Star Michael Crichton Executive Producer John Wells Executive Producer