The murder of a Marine provides new clues in the first case Pride and Lasalle ever worked together, just before Hurricane Katrina struck the city and washed away any evidence. Also, the team celebrates Thanksgiving together in Pride’s bar.

The murder of a petty officer leads Pride and his team to a mysterious woman who is targeting men with high security clearance. Also, Lasalle’s father, Beau, arrives in town to discuss the family business.

Pride and his bar patrons, including Sydney Halliday who is visiting Pride after leaving the Army, are held hostage by a group of volatile thieves.

NCIS investigates the disappearance of a Navy entomologist after a deadly shooting at a research lab. Nero, with Naval Intelligence, joins the investigation when the team discovers a rare and deadly virus was also stolen.

When Elvis Bertrand's "daughter" is linked to an NCIS murder case, he asks Pride to prove her innocence.

After a natural gas explosion at a movie theater, the NCIS team discovers the gas company has been hacked and more explosions could be triggered.

When a Navy sailor is found dead, the team tracks the suspicious movements of people in his life prior to his death. Also, Hannah comes to terms with her daughter's relationship with her ex's new girlfriend, Veronica.