Don McGill Creator Donald P. Bellisario Creator, Executive Producer, Writer Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor Sasha Alexander NCIS Special Agent Caitlin Todd Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor David McCallum Dr. Donald "Ducky" Mallard Actor Brian Dietzen Jimmy Palmer Guest Star Tamara Taylor NCIS Special Agent Cassie Yates Guest Star Steven Eckholdt Navy Cmdr. Dr. Brad Pitt Guest Star Kelsey Oldershaw Navy Nurse Lt. Emma Ingham Guest Star Mariette Hartley Hanna Lowell Guest Star Olivia Burnette Sarah Lowell Guest Star Ty Upshaw Security Guard Guest Star Bibi Amos Receptionist Guest Star Rizwan Manji Dr. Pandy Guest Star Dennis Smith Director