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 John Stamos Dr. Tony Gates Actor Seymour Cassel Alfred Gower Guest Star Steve Bacic Derek Marshak Guest Star Annabella Sciorra Diana Moore Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Troy Evans Frank Martin Guest Star Busy Philipps Hope Bobeck Guest Star Marc Jablon Larry Weston Guest Star Julia Ling Mae Lee Park Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Chloe Greenfield Sarah Riley Guest Star Brett Rickaby Vincent Hales Guest Star Vyto Ruginis Wright Guest Star Montae Russell Dwight Zadro Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer