NCIS: Season 4, Episode 18

4 - 18: Iceman

When the man on Ducky's table turns out to still be alive the unit must track the young Marine's actions prior to his arrival in the morgue. They discover that the marine had been on leave and used his time off for a secret trip to Baghdad. The case takes a turn when Mike Franks - Gibbs' old boss shows up revealing that the young marine is in fact his son.