Mekhi Phifer Dr. Gregory Pratt Actor Maura Tierney Abby Lockhart Actor Linda Cardellini Nurse Samantha Taggart Actor Goran Visnjic Dr. Luka Kovac Actor Parminder Nagra Dr. Neela Rasgotra Actor Shane West Actor Scott Grimes Dr. Archie Morris Actor Laura Innes Dr. Kerry Weaver Actor John Leguizamo Dr. Victor Clemente Guest Star Leland Orser Dr. Lucien Dubenko Guest Star Danny Glover Charlie Pratt Sr. Guest Star Kristen Johnston Guest Star Kat Dennings Zoe Butler Guest Star Tina Lifford Evelyn Pratt Guest Star Troy Evans Frank Martin Guest Star Yvette Freeman Nurse Haleh Adams Guest Star April L. Hernandez Nurse Inez Guest Star Kyle Richards Nurse Dori Guest Star Shane Haboucha Barry Kendrick Guest Star Sam Jones III Chaz Pratt Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer