A gas explosion at a movie theater, is investigated by the team. They discover a hacker is involved, and there is a strong possibility of further explosions, so they shift into high gear on the hunt, while still mourning LaSalle's death.
The NCIS team partners with several federal agencies to track a sniper who is targeting crowded events in the city. Also, FBI Special Agent Tammy Gregorio arrives to investigate Pride and his team.
The NCIS team reviews unorthodox training exercises after a Navy Seal candidate is found murdered weeks before his graduation. Also, a concerned Wade turns to Pride after her adopted son, Danny, announces his plan to enter the Navy.
