Michelle Pierce

When dozens of children from military families come down with a mysterious illness, the team tries to deliver a cure before the holidays.

Gibbs and the team investigate when a Navy lieutenant who is set to be the first openly gay service member to receive the Medal of Honour is murdered. Also, as his wife's due date approaches, Palmer prepares for fatherhood with a NCIS baby shower.

When a Navy captain is murdered in his hotel room, the NCIS team has to find his pregnant companion and protect her from unknown assailants. Meanwhile, Jimmy brings his future father-in-law to work.

Terrorism shakes the foundations of the Navy and NCIS to such an extent that Gibbs and the team face surprises that will devastate them.

While investigating the death of an intruder at Quantico, Jimmy and Kasie are exposed to a deadly biotoxin, and the NCIS team calls on Doctor Carol Wilson for help as they race to find the antidote. Also, Torres tries to distract Jimmy's daughter.

Gibbs is forced to revisit his painful past when his former mother-in-law turns out to be a witness in a murder investigation.