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 Rocky Carroll NCIS Director Leon Vance Actor David McCallum Dr. Donald "Ducky" Mallard Actor Bob Newhart Dr. Walter Magnus Guest Star John Posey Lance Simmons Guest Star Guy Wilson Paul Simmons Guest Star Jonathan Goldstein Glenn Block Guest Star Sean Blakemore Navy Chief Petty Officer Jerome Carr Guest Star Andi Carnick Penny Block Guest Star Tonja Kahlens Nina Craig Guest Star Chad Michael Collins Navy Petty Officer 1st Class Simon Craig Guest Star Donald P. Bellisario Executive Producer Arvin Brown Director Gary Glasberg Writer