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 Goran Visnjic Dr. Luka Kovac Actor Michael Michele Cleo Finch Actor Maura Tierney Abby Lockhart Actor Ming-Na Wen Actor Paul McCrane Robert Romano Actor Mae Elvis Alyssa Adams, Jane Doe Guest Star Cody Kasch Jason Bender Guest Star Gabrielle Union Tamara Davis Guest Star John Cullum David Greene Guest Star Mike Genovese Officer Al Grabarsky Guest Star Brian Hooks Dylan Guest Star Leo Rossi Detective Cruson Guest Star Andrew Bowen Andrew Guest Star Alice Dodd Mrs. Sumpter Guest Star Erica Gimpel Adele Newman Guest Star Michael Crichton Executive Producer John Wells Executive Producer