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 Sally Field Maggie Wyczenski Guest Star Tom Everett Scott Eric Wyczenski Guest Star Mary Carver Matilda Guest Star Jeffrey DeMunn Treatment Center Doctor Guest Star Megan Vint Morgan Brenner Guest Star Marcello Thedford Leon Guest Star Abraham Benrubi Jerry Markovic Guest Star Conni Marie Brazelton Nurse Connie Oligario Guest Star Laura Cerón Guest Star Yvette Freeman Nurse Haleh Adams Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer