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 Callie Thorne Jodie Kenyon Guest Star Saige Thompson Amanda Ramsey Guest Star Amy Aquino Dr. Janet Coburn Guest Star Laura Cerón Nurse Chuny Marquez Guest Star Deezer D Nurse Malik McGrath Guest Star Misha Collins Bret Guest Star Dahlia Salem Dr. Jessica Albright Guest Star Kim Gillingham Mrs. Ramsey Guest Star John Posey Mr. Ramsey Guest Star John Wells Executive Producer Michael Crichton Executive Producer Neal Baer Executive Producer Jack Orman Executive Producer