Anthony Edwards Dr. Mark Greene 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 Celia Weston Nurse Practitioner, Sister Maureen Chapman Guest Star Porscha Palmer Adelina Young Guest Star Tonea Stewart Pearl Guest Star April Turner Annie Guest Star Jamie Wilson Melanie Ebee Guest Star Cynthia Calhoun Becca Guest Star Robin O'Dell Sally Mannon Guest Star Joanne Pankow Mrs. Ebee Guest Star Tim Powell Mannon Guest Star Tom Nowicki Dr. Brooks Guest Star Michael Crichton Executive Producer John Wells Executive Producer