McGee and Torres try to recover a stolen truck filled with toys for the Navy's annual Christmas drive while the truth about Parker's mother is finally revealed. Also, Knight is given her first NCIS: Elite mission.

When a man is shot by the Secret Service outside the vice president's official residence, NCIS is aided in the case by a new member of the team: an AI chatbot being beta-tested by the Department of Justice.

A kidnapped teen leads the team to a Navy SEAL who survived captivity by the Taliban but may have committed murder after returning home. Also, Jimmy finally shares his findings about the mysterious death of Parker's mother with his boss.

When McGee is kidnapped while promoting his latest book in the Deep Six crime series, the team investigates his self-professed "#1 fan" - and a potential link to a murder case involving stolen classified documents.

A prison break by an inmate who had just three weeks left on a sentence compels the team to reopen the case of a naval officer's death that was originally investigated by Gibbs and Franks in the ‘90s, and enlist the help of retired special agent Vera Strickland. Also, the team has different views on what to include in a special Navy time capsule.

The team investigates a U.S. marine who is believed to have kidnapped the wife of one of the most powerful men at the Department of Justice.

When a petty officer's death is connected to a blackmail investigation, the team is forced to work with Special Agent Sawyer on the case, which takes a terrifying turn for Torres. Meanwhile, Knight is offered an opportunity to train with NCIS Elite.

Parker's pursuit of vengeance for his father's murder could have deadly consequences, while his sister, Navy Vice Admiral Harriet Parker, faces an impossible choice. 

Reeling from his father's murder, Parker goes to extreme lengths to hunt down the woman he holds responsible, mob boss Carla Marino, jeopardizing not only his own future but the team's.