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 Sean Murray NCIS Special Agent Timothy McGee Actor David McCallum Dr. Donald "Ducky" Mallard Actor Brian Dietzen Jimmy Palmer Guest Star Billy Aaron Brown Donny Potter Guest Star Troian Bellisario Sarah McGee Guest Star Matt DeCaro Chief Daryl Bello Guest Star Sherman Augustus Marine Cpt. Daniel Lemay Guest Star Jeffrey Wincott Gunnery Sgt. Leeka Guest Star Amy Tipton Liza Taylor Guest Star Marie Dellegrazie Ashley Simmons Guest Star Jon Wellner Simon Frankel Guest Star Judd Trichter Hunter Huxley Guest Star Kaj-Erik Eriksen Frank Smith Guest Star Ryan Jeffrey Kyle Zolin Guest Star Jesse Heiman Fredrick Pippin Guest Star Donald P. Bellisario Executive Producer Dennis Smith Director Christopher Silber Writer