Anthony Edwards Dr. Mark Greene Actor Eriq La Salle Dr. Peter Benton 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 Erik Palladino Dave Malucci Actor Ming-Na Wen Actor Wentworth Miller Mike Palmieri Guest Star James Callahan Mr. Bristol Guest Star Mark Valley Richard Lockhart Guest Star Brent Jennings Nat Guest Star Amy Aquino Dr. Janet Coburn Guest Star Troy Evans Frank Martin Guest Star Deezer D Nurse Malik McGrath Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Gerry Black Mr. Fletcher Guest Star John Doe Carter's Doctor Guest Star Barry Gordon Baxter Guest Star Jonathan Mangum Med Student Ryan Bradford Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer