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 Pancho Demmings Gerald Jackson Guest Star Alan Dale N.C.I.S. Director Tom Morrow Guest Star Joe Spano Senior FBI Agent T.C. Fornell Guest Star Terry O'Quinn Marine Col. Will Ryan Guest Star Kevin McClatchy Lt. David Cameron Guest Star John Rosenfeld Agent Charles Guest Star Grinnell Morris FBI Agent Carlson Guest Star Jeff Austin Col. Mike Granger Guest Star Barton Tinapp Agent Cobb Guest Star David Rountree Surveillance Technician Guest Star Donald P. Bellisario Executive Producer Thomas J. Wright Director John C. Kelley Writer