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 David McCallum Dr. Donald "Ducky" Mallard Actor Sean Murray NCIS Special Agent Timothy McGee Guest Star Rudolf Martin Ari Haswari Guest Star Josie Davis Marta Guest Star Matthew Rauch John Guest Star Brian Dietzen Jimmy Palmer Guest Star Nicholas Guilak Bassam Guest Star Amir Talai Simi Guest Star Paul Perri Marvin Atwood Guest Star Robert Cicchini Special Agent Daniel Snyder Guest Star Jessica Steen NCIS Special Agent Paula Cassidy Guest Star Sheila E. Frazier Debra Green Guest Star Matt Sigloch Man Guest Star Dan Lundy Technician Guest Star Joe Spano Senior FBI Agent T.C. Fornell Guest Star Donald P. Bellisario Executive Producer, Writer Thomas J. Wright Director