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.

Lifeline

S21 E3

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.

Left Unsaid

S21 E4

The NCIS team is in a race against time to find a missing officer who disappeared during his wedding proposal.

The Plan

S21 E5

With the help of Knight's dad, NCIS works to unravel the mystery of a recently used service weapon belonging to a missing agent. Also, McGee is in a tailspin when DNA results reveal a close relative he was unaware of.

Strange Invaders

S21 E6

After discovering a navy pilot's body riddled with unusual wounds, NCIS' investigation draws the team into the rabbit hole of UFO conspiracy theories.

A Thousand Yards

S21 E7

NCIS comes under attack by a mysterious enemy from the past. Also, Vance tries to mend fences with his estranged son by explaining why, despite the ongoing dangers of his job, he still chooses to stay at NCIS.

Heartless

S21 E8

The NCIS team looks for a motive behind the kidnapping and death of a famous heart surgeon.

Prime Cut

S21 E9

After discovering the remains of a Marine captain, the NCIS team travels to Texas to interrogate the suspected killer.

Reef Madness

S21 E10

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.