Episode 15: Cabin Fever Now

The NCIS team investigates an explosion at a global terror summit, suspecting Gibbs' arch-nemesis, Sergei Mishnev.

The episode concludes the long-running Mishnev storyline when Fornell kills him, finally avenging his wife. Episode 15: Cabin Fever

Gibbs chooses to step away from the primary investigation to support a grieving Tobias Fornell, whose life is spiraling following his wife's murder. The NCIS team investigates an explosion at a

The episode explores Locke's birth and childhood, revealing that his destiny has been manipulated by Island forces (like Richard Alpert) since he was a young boy. suspecting Gibbs' arch-nemesis

While "Cabin Fever" is actually Episode 11 of Season 4, it is one of the most analyzed episodes in the series due to its deep mythology.