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, Writer 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 Michelle Pierce Breena Palmer Guest Star Meredith Eaton Carol Wilson Guest Star Benita Krista Nall Amanda Wright Guest Star Patrick Bristow Channing Elroy Guest Star Eugene Prokofiev Buggy, Dennis Newton Guest Star Jack Jaco Pitchon Dr. Yuri Pastov Guest Star Kristin Witt Soccer Mom Guest Star Davee Youngblood Unknown Man Guest Star Elle Graper Victoria Palmer 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 Donald P. Bellisario Executive Producer Diana Valentine Director