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 Scott Grimes Dr. Archie Morris Actor John Stamos Dr. Tony Gates Actor Aida Turturro Sheryl Hawkins Guest Star Chloe Greenfield Sarah Riley Guest Star Bill Bolender Hank Riley Guest Star Frances Conroy Becky Riley Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Gina Ravera Dr. Bettina DeJesus Guest Star Steven Christopher Parker Guest Star Troy Evans Frank Martin Guest Star Lily Mariye Nurse Lily Jarvik Guest Star Jake Thomas Nick Riley Guest Star Christopher Chulack Executive Producer Michael Crichton Executive Producer David Zabel Executive Producer John Wells Executive Producer R. Scott Gemmill Executive Producer