Donald P. Bellisario Creator, Executive Producer Don McGill Creator 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 Jaclyn Aimee Esme Guest Star Menik Gooneratne Diya Khatri Guest Star Vanessa Lachey Special Agent Jane Tennant Guest Star KayKay Blaisdell Gen Z Girl Guest Star Jesse Conrad William Watson Guest Star Vonzell Carter Instructor Guest Star Susan Ruttan Samantha "Sammy" Delfino Guest Star Zachary S. Williams Logan Kennedy Guest Star Nicole Rainteau Kaytlynn Guest Star Andy Marques Policeman Guest Star Leah Grosjean Navy Ensign Ashley Watts 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, Writer Marco Schnabel Writer Tawnia McKiernan Director James Whitmore Jr. Director Chad Gomez Creasey Writer Lionel Coleman Director Brendan Fehily Writer Michael Zinberg Director Diana Valentine Director