Goran Visnjic Dr. Luka Kovac Actor Maura Tierney Abby Lockhart Actor Mekhi Phifer Dr. Gregory Pratt Actor Parminder Nagra Dr. Neela Rasgotra Actor Linda Cardellini Nurse Samantha Taggart Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor Eamonn Walker Dr. Stephen Dakarai Guest Star Mary McCormack Debbie Guest Star Noah Wyle Dr. John Carter Guest Star Quanita Adams Zahra Guest Star Chris Gxalalaba Ibrahim Guest Star Thomas Kariuki Ishaak Guest Star Nkuli Kgositsile Nyawelah Guest Star Busi Lurayi Sittina Guest Star Ezra Mabengeza Janjaweed Soldi Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer