Mark Harmon NCIS Special Agent Leroy Jethro Gibbs Actor, Executive Producer Sean Murray NCIS Special Agent Timothy McGee Actor Emily Wickersham NCIS Special Agent Eleanor "Ellie" Bishop Actor Wilmer Valderrama NCIS Special Agent Nicholas "Nick" Torres Actor Maria Bello Special Agent Jacqueline "Jack" Sloane Actor Brian Dietzen Dr. Jimmy Palmer Actor Diona Reasonover Forensic Scientist Kasie Hines Actor Rocky Carroll NCIS Director Leon Vance Actor, Director David McCallum Dr. Donald "Ducky" Mallard Actor Kevin Kilner Patrick Norian Guest Star Zak Steiner Marine Staff Sergeant Richard "Ricky" Devol Guest Star Lisa LoCicero Elena Devol Guest Star Aaron Craven U.S. Congressman for Virginia Eric Riley Guest Star Frank Clem Phil Rutland Guest Star Eugene Shaw Marine Master Sergeant Neil Koh Guest Star Alina Phelan Amy Guest Star Jack Fisher Phineas Guest Star Jessica Cavanagh Monica Shaw Guest Star Alison Trumbull Karen Guest Star Tatum Shank Ted Guest Star Kale Culley Dylan Guest Star Rainey Spurlock Harper Guest Star Tanya Leon Marina Bazarov 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 Marco Schnabel Writer