Local cops find the apparently dead body of a Marine corporal, on leave from his third tour in Iraq, facedown in a snowdrift in Montrose Park; the Metro PD calls the NCIS; when Ducky prepares to examine, the subject, O'Neill, suddenly wakes up and gasps; Ducky transfers him to a hospital; Ducky had already noticed a lump and bruises on his head and neck, so he says that he did not merely fall into the snowdrift; Gibbs and company investigate. Mike Franks shows up with an amazing revelation. O'Neill dies, and Abby makes a startling discovery. Franks investigates a related matter on his own, and Gibbs follows him, then the two of them sort it out. Tony and Jeanne encounter a problem.
—DocRushing