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 Abraham Benrubi Actor Kellie Martin Lucy Knight Actor Paul Freeman Dr. Charles Corday Guest Star Vince Vieluf Bernard Gamely Guest Star Freda Foh Shen Audiologist Guest Star Alan Blumenfeld Rob Savage Guest Star Ted Rooney Neonatologist Dr. Tabash Guest Star David Brisbin Dr. Alexander Babcock Guest Star Paul McCrane Robert Romano Guest Star Bernard White Addict seeking Rapid Detox Guest Star Yvonne Zima Rachel Greene Guest Star Debra Engle Guest Star Michael Crichton Executive Producer John Wells Executive Producer