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The Best Episodes of NCIS Season 21

Every episode of NCIS Season 21 ranked from best to worst. Discover the Best Episodes of NCIS Season 21!

The Best Episodes of NCIS Season 21

From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has a shred of evidence connected to...
  1. Background image for Algún Día
    8.0/10(434 votes)

    #1 - Algún Día

    S21:E1

    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.

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  2. Background image for The Stories We Leave Behind
    9.6/10(1.1k votes)

    #2 - The Stories We Leave Behind

    S21:E2

    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.

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  3. Background image for Lifeline
    8.1/10(384 votes)

    #3 - 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.

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  4. Background image for Left Unsaid
    7.7/10(358 votes)

    #4 - Left Unsaid

    S21:E4

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

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  5. Background image for The Plan
    7.9/10(355 votes)

    #5 - 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.

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  6. Background image for Strange Invaders
    7.7/10(351 votes)

    #6 - 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.

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  8. Background image for A Thousand Yards
    8.8/10(510 votes)

    #7 - 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.

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  9. Background image for Heartless
    8.0/10(327 votes)

    #8 - Heartless

    S21:E8

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

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  10. Background image for Prime Cut
    7.1/10(331 votes)

    #9 - Prime Cut

    S21:E9

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

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  11. Background image for Reef Madness
    7.7/10(333 votes)

    #10 - 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. Also, Vance offers Knight a unique opportunity.

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Season 21 Ratings Summary

"Algún Día" is the best rated episode of "NCIS" season 21. It scored 8/10 based on 434 votes. Directed by Diana Valentine and written by Christopher J. Waild, it aired on 2/12/2024. This episode is rated 1.6 points higher than the second-best, "The Stories We Leave Behind".