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 David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Austin Cauldwell Ryan Aaronson, Travis Jacobs Guest Star Rachel Ticotin Joy Sullivan Aaronson Guest Star Jason MacDonald John Watts Guest Star Sadie Stratton Renee Watts Guest Star Jason Manuel Olazabal Todd Mercer Guest Star Brenda Kate Sheila, Wife Guest Star Shane Blades Husband Guest Star Nicole Rainteau Kaytlynn Guest Star Kathryn Melton Cleaning Lady Guest Star Warren Sweeney Priest 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 Chad Gomez Creasey Writer Lionel Coleman Director