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Sub Rosa is the seventh episode of the first season of NCIS, and the seventh episode overall.
Guest Stars: Sean Murray (Agent Timothy McGee), Pancho Demmings (Gerald Jackson), Ben Murphy (CPT Veitch), David Monahan (PO Drew), Eric Laden (PO Thompson), David O'Donnell (Jeb), Peter Onorati (Chief of the Boat), Glenn Morshower (CDR Robert Peters), Michael Lowry (XO Akron), J. Robin Miller (LT Connors), Mat Hostetler (Mess Specialist), Jamie Moss (Seaman Apprentice), Reed Rudy (Air Transport Officer), Mik Scriba, James Black
Workers at a naval base discover a decomposing body immersed in a plastic chemical drum filled with acid, and Ducky and Abby discover a tattoo indicating that the man was a submariner. There are no reports of missing submarine crew, so Gibbs decides that the man has been replaced by an imposter. The team must find out what submarine the imposter is aboard and stop him from carrying out whatever his plan might be.
- This episode marked the introduction of Agent Timothy McGee, who joined the main cast the following season.