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 Kellie Martin Lucy Knight Actor Yvonne Zima Rachel Greene Guest Star Philip Casnoff Dr. Dan Litvak Guest Star Julie Bowen Roxanne Please Guest Star Sheila Kelley Coco Robbins Guest Star Matthew Glave Dr. Dale Edson Guest Star Vince Vieluf Bernard Gamely Guest Star Mike Genovese Officer Al Grabarsky Guest Star Shannon Cochran Mrs. Klingman Guest Star Christian Hoff Med Student Guest Star Brian Leckner Lloyd Guest Star Michael Crichton Executive Producer John Wells Executive Producer