Don McGill Creator Donald P. Bellisario Creator, Executive Producer Sean Murray NCIS Special Agent Timothy McGee Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Katrina Law NCIS Special Agent Jessica Knight Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Michael Kostroff Felix Lassiter Guest Star Carolyn Hennesy Secretary of The Navy, Tara Flynn Guest Star Elise Eberle Arlene Wilkes Guest Star Jonny Rios Victor Wilkes Guest Star Christian Barillas Rafael "Rafa" Lopez Guest Star Devika Parikh Doctor Saanvi Singh Guest Star Joshua Nazaroff Zero Guest Star Patrick Laborteaux Olev Kozlov Guest Star Brandon Papo Bobby Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Mark Harmon Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer Brendan Fehily Writer David J. North Writer