1. Algún Día
The NCIS team must help Torres when he puts his future at stake by confronting the man who tormented his family when he was a child.
NCIS — Season 21
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2. The Stories We Leave Behind
As NCIS mourns the loss of Ducky, the agents find comfort in working on one of his unfinished cases involving a woman whose father was dishonorably discharged from the Marines.
3. Lifeline
When the NCIS team engages in Walk-a-Mile day to gain a new perspectives on different departments, things take a turn when Kasie receives a distress call from a mysterious man.
4. Left Unsaid
The NCIS team is in a race against time to find a missing officer who disappeared during his wedding proposal.
5. The Plan
With the help of Knight's dad, NCIS works to unravel the mystery of a recently used service weapon belonging to a missing agent.
6. Strange Invaders
After discovering a Navy pilot's body riddled with unusual wounds, NCIS' investigation draws the team into the rabbit hole of UFO conspiracy theories.
7. A Thousand Yards
NCIS comes under attack by a mysterious enemy from the past.
8. Heartless
The NCIS team looks for a motive behind the kidnapping and death of a famous heart surgeon.
9. Prime Cut
After discovering the remains of a Marine captain, the NCIS team travels to Texas to interrogate the suspected killer.
10. Reef Madness
Parker and Knight discover three bodies on an old Navy ship that's about to be sunk and turned into an artificial reef, when they're suddenly locked inside by a mysterious figure.