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 Ming-Na Wen Actor Sherry Stringfield Dr. Susan Lewis Actor Sharif Atkins Actor Mekhi Phifer Dr. Gregory Pratt Actor Marcello Thedford Leon Guest Star Ed Asner Dr. James McNulty Guest Star Bruce Weitz Alderman John Bright Guest Star Bruno Campos Dr. Eddie Dorset Guest Star Deezer D Nurse Malik McGrath Guest Star Troy Evans Frank Martin Guest Star Kyle Richards Nurse Dori Guest Star Montae Russell Dwight Zadro Guest Star Shannon Whirry Doreen Brant Guest Star Heather DeLoach Helen Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer