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 Brian Dietzen Jimmy Palmer Guest Star Daniel Gillies Royal Marine Maj. Peter Malloy Guest Star Kristen Ariza Loretta Tennison Guest Star Tracy Middendorf Tara Bick Guest Star John T. Woods Navy Chief Petty Officer Jason Crosby Guest Star Peter Holden Vector Control Worker Guest Star Jamie Elman Realtor Guest Star Ron Bottitta Capt. Jamison Guest Star Chris Jarvis Royal Marine Engineer Guest Star Donald P. Bellisario Executive Producer Arvin Brown Director Reed Steiner Writer