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 Mare Winningham Dr. Amanda Lee Guest Star Scott Mosenson Michael Gambrell Guest Star Kyle Chambers Ricky Abbott Guest Star Cress Williams Officer Reggie Moore Guest Star Phyllis Frelich Dr. Lisa Parks Guest Star Mathew Watkins Reese Benton Guest Star Valerie Mahaffey Joi Abbott Guest Star Julie Bowen Roxanne Please Guest Star Matthew Glave Dr. Dale Edson Guest Star Nancy Lenehan Edie Harvell Guest Star Michael Crichton Executive Producer John Wells Executive Producer