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 Gary Cole FBI Special Agent Alden Parker Actor Nancy Travis Harriet Parker Guest Star LL Cool J Sam Hanna Guest Star Emily Wickersham Eleanor "Ellie" Bishop Guest Star Geoffrey Arend Tommy Manning Guest Star Noah Bean DOD Chief David Barbado Guest Star Melinda Page Hamilton Kathy Sheldon Actor Regina Ting Chen Training Officer Odom Guest Star Regan Aliyah Nadine Guest Star Asanté Deshon Rookie Officer Farley Guest Star Alex J. Joseph Navy Sailor Wicks Guest Star Frank Gallegos Pete the Plumber Guest Star Juliana Danielle Ferreira Megan Manning Guest Star Capri-Antoine Vaillancourt Navy Sailor Myers Guest Star Steven D. Binder Executive Producer David J. North Executive Producer Chas. Floyd Johnson Executive Producer Mark Harmon Executive Producer Scott Williams Executive Producer, Writer Christopher J. Waild Executive Producer, Writer Mark R. Schilz Executive Producer James Whitmore Jr. Director Amy Rutberg Writer Diana Valentine Director Marco Schnabel Writer Andrew Bartels Writer Sydney Mitchel Writer Marc Roskin Director Tawnia McKiernan Director José Clemente Hernandez Director Gregory Gontz Film Editor