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Double Down is the tenth episode of the fifteenth season of NCIS, and the three hundred fortieth episode overall.
Starring: Mark Harmon (Leroy Jethro Gibbs), Pauley Perrette (Abby Sciuto), Sean Murray (Timothy McGee), Wilmer Valderrama (Special Agent Nicholas "Nick" Torres), Maria Bello (NCIS Special Agent Jacqueline "Jack" Sloane), Emily Wickersham (Eleanor Bishop), Brian Dietzen (Dr. Jimmy Palmer), Duane Henry (MI6 Officer Clayton Reeves) (credit only)
Guest Starring: James Morrison (U.S. Senator John Phillips), Jonathan Kite (Chet Goodman), Aaron Jennings (Seth Hendrix), Amanda Payton (Misty Boxlarter), Nicki Micheaux (Metro P.D. Detective Martha Mayer), Michael Masini (Axel McKenzie III), Franco Barberis (Marine Gunnery Sergeant Matt Lecroix)