Anthony Edwards Dr. Mark Greene Actor George Clooney Dr. Doug Ross Actor Sherry Stringfield Dr. Susan Lewis 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 Glenne Headly Guest Star Omar Epps Guest Star John Aylward Guest Star Jorja Fox Dr. Maggie Doyle Guest Star Lawrence Tierney Jack Johnson Guest Star Dennis Fimple Dante Guest Star John Diehl Johnson's Son Guest Star Sara Rue Jane Guest Star Eileen Brennan Betty Guest Star George Murdock Mr. Sidowski Guest Star Elizabeth Barondes Heather Guest Star Deezer D Nurse Malik McGrath Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Emily Wagner Doris Pickman Guest Star Josie Kim Nurse Hodges Guest Star Michael Crichton Executive Producer John Wells Executive Producer