Having passed medical and psych evaluations, Tennant is surprised to see Sam conducting her final interview to clear her return to work. Following a breach in the US Marshal's database, Sam joins Tennant in Las Vegas to locate the hacker.

Following the crash of a prisoner transport plane, the NCIS team must find the convicts that escaped onto the island. Meanwhile, Sam Hanna and Tennant are tasked with locating a high-profile Russian prisoner known as "The Chemist."

When a Navy pilot is found murdered at a local military resort, the team goes undercover to discover a criminal enterprise hiding in plain sight.

NCIS is tasked to protect the daughter of a Russian oligarch carrying a deadly secret. Meanwhile, Sam asks Tennant for a favor.

When the fiancée of a vanished naval officer seeks the help of NCIS, the team reveals his secrets go much deeper than she suspected. Meanwhile, Sam recruits Kai to be his wingman.

When a Marine is murdered during training, the NCIS team tracks the suspect deep into the woods and discovers a disturbing secret.

Marine's wife kidnapped for ransom, NCIS team races against time to find abductor while uncovering dark secrets. Sam seeks Ernie's aid to decrypt a potentially deadly computer program.

When a high-value bioweapons expert is murdered in a secure facility, NCIS and the NCIS Elite team join forces to track down the killer and discover an even deadlier threat.

Following a devastating ambush with a deadly bioweapon, the NCIS team must track down a mysterious terrorist group before they can strike again.