The Helpers
While investigating the death of an intruder at Quantico, Jimmy and Kasie are exposed to a deadly biotoxin. The NCIS team calls on Dr. Carol Wilson for help as they race to find the antidote.
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More from this season
S19 E1
Blood in the Water
As the NCIS team searches for Gibbs after wreckage from his boat is discovered, they find out he was tracking a serial killer with journalist Marcie Warren, who wrote an exposé on him.
S19 E2
Nearly Departed
While trying to find the serial killer Gibbs was after, the NCIS team discovers another person has been tracking the case as well.
S19 E3
Road to Nowhere
Gibbs and Parker go on a road trip to find one of the serial killer's victims. Also, Agent Knight goes undercover at a large manufacturing company with ties to the murders.
S19 E4
Great Wide Open
Gibbs and McGee head to Alaska while the team works at home to uncover the conspiracy behind the serial killer.