Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor Michael Weatherly NCIS Special Agent Anthony "Tony" Dinozzo Actor Cote de Pablo NCIS Special Agent Ziva David Actor Pauley Perrette Forensic Specialist Abby Sciuto Actor Sean Murray NCIS Special Agent Timothy McGee Actor Lauren Holly NCIS Director Jenny Shepard Actor David McCallum Dr. Donald "Ducky" Mallard Actor Brian Dietzen Jimmy Palmer Guest Star Susanna Thompson Army Lt. Col. Hollis Mann Guest Star Scottie Thompson Jeanne Benoit Guest Star Joe Spano Senior FBI Agent T.C. Fornell Guest Star Muse Watson Mike Franks Guest Star Armand Assante La Grenouille Guest Star Don Franklin FBI Agent Ron Sacks Guest Star Liza Lapira Special Agent Michelle Lee Guest Star Michael Gilden Marty Pearson Guest Star David Dayan Fisher Trent Kort Guest Star Stephanie Mello Cynthia Sumner Guest Star Sandra Hess Regine Smidt Guest Star Mary Mouser Kelly Gibbs Guest Star Donald P. Bellisario Executive Producer, Writer Dennis Smith Director John C. Kelley Writer Thomas J. Wright Director Terrence O'Hara Director James Whitmore Jr. Director Colin Bucksey Director Martha Mitchell Director Shane Brennan Writer Nell Scovell Writer Robert Palm Writer Christopher Silber Writer David J. North Writer Jesse Stern Writer William Webb Director Steven Kriozere Writer Steven D. Binder Writer Ric Arthur Writer