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 Steve Rankin Sgt. Bill Atlas Guest Star Sean Murray NCIS Special Agent Timothy McGee Guest Star Jenya Lano Carol Powers Guest Star Alex Meneses Vanessa Guest Star Derek Webster Marine Maj. Joe Sacco Guest Star Cole Griffin Marine Cpl. Jackson Guest Star Jacobi Wynne Cpl. Mark Cohen Guest Star Michael Goetz Bartender Guest Star Dayna Devon Attractive Girl Guest Star Robert Floyd Police Officer Guest Star Donald P. Bellisario Executive Producer Jeff Woolnough Director John C. Kelley Writer