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 Jessica Steen NCIS Special Agent Paula Cassidy Guest Star Robert Cicchini Special Agent Daniel Snyder Guest Star Tim Kelleher NCIS Special Agent Christopher Pacci Guest Star Jennifer Gatti Negotiator Arkin Guest Star Ali Afshar Qassam Guest Star Matthew Del Negro Balboa Guest Star Joe Sabatino H.R.T. Leader Horowitz Guest Star Constance McCrory Evidence Clerk Guest Star Rudolf Martin Ari Haswari Guest Star Donald P. Bellisario Executive Producer, Writer Peter Ellis Director