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 Jessica Gardner Olivia Kahn Guest Star Marem Hassler Lena Paulsen Guest Star Dustin Seavey Larry Sykes Guest Star Elyse Levesque Frauke Biedermann Guest Star Oscar Best Phil Newcastle Guest Star Marika Engelhardt Elisabeth Wenders Guest Star Ian Fisher Sergei Umarov Guest Star Charley Rowan McCain Heidi Umarov Paulsen 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 Donald P. Bellisario Executive Producer Marco Schnabel Writer James Whitmore Jr. Director