Anthony Edwards Dr. Mark Greene Actor Noah Wyle Dr. John Carter Actor Laura Innes Dr. Kerry Weaver Actor Alex Kingston Dr. Elizabeth Corday Actor Goran Visnjic Dr. Luka Kovac Actor Maura Tierney Abby Lockhart Actor Paul McCrane Robert Romano Actor Michael Michele Cleo Finch Actor Ming-Na Wen Actor Sherry Stringfield Dr. Susan Lewis Actor Eriq La Salle Dr. Peter Benton Actor Sharif Atkins Guest Star Hallee Hirsh Guest Star Christine Harnos Jennifer Simon Guest Star Natalie Bridgman Serena Guest Star Nick Mita Kai Guest Star Guy Rodrigues Billy Guest Star Skip Stellrecht Chaplain Miller Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer