Donald P. Bellisario Creator, Executive Producer Don McGill Creator Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, 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 David McCallum Dr. Donald "Ducky" Mallard Actor Gary Cole FBI Special Agent Alden Parker Actor Daniel DiMaggio Noah Patrick Henry Richter Guest Star Mary-Bonner Baker Navy Chief Petty Officer Melissa Fields Guest Star Skyler Stone Uncle Stan Guest Star Brea Bee Mrs. Richter Guest Star Betsy Baker Ramona Guest Star Jennifer Rhodes Claudia Guest Star Jeffrey Markle Jerry Guest Star Isait De La Fuente Navy Petty Officer First Class Lucas Moniz Guest Star Matthew Sato Zack Taylor AKA Seller Guest Star Nick Cardiff Jason Samuels AKA Sketchy Guy Guest Star Cay Ryan Murray Teagan Fields Guest Star Erin Yolanda Pineda Cynthia Moniz Guest Star Chas. Floyd Johnson Executive Producer Mark Horowitz Executive Producer Frank Cardea Executive Producer George Schenck Executive Producer Steven D. Binder Executive Producer Scott Williams Executive Producer David J. North Executive Producer Kimberly-Rose Wolter Writer Katherine Beattie Writer Michael Zinberg Director