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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!

Binge this in 7h 15m•Peaking at 9.6/10

From murder and espionage to terrorism and stolen submarines, a team of special agents investigates any crime that has any connection to Navy and Marine Corps personnel, regardless of rank or position.

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Episode Rankings

  1. #1 Fan Favorite
    NCIS Season 21 Episode 1 - Algún Día
    8.0/10(474 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.

    Director:Diana Valentine
    Writer:Christopher J. Waild

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  2. NCIS Season 21 Episode 2 - The Stories We Leave Behind
    9.6/10(1259 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.

    Director:Michael Zinberg
    Writers:Scott Williams, Brian Dietzen

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  3. NCIS Season 21 Episode 3 - Lifeline
    8.1/10(429 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.

    Director:Rocky Carroll
    Writer:Marco Schnabel

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  4. NCIS Season 21 Episode 4 - Left Unsaid
    7.7/10(398 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.

    Director:Daniela Ruah
    Writer:Yasemin Yilmaz

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  5. NCIS Season 21 Episode 5 - The Plan
    7.9/10(398 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.

    Director:Lionel Coleman
    Writers:Katherine Beattie, Chad Gomez Creasey

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  6. NCIS Season 21 Episode 6 - Strange Invaders
    7.7/10(394 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.

    Director:Claudia Yarmy
    Writers:Steven D. Binder, Gina Gold, Aurorae Khoo

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  7. NCIS Season 21 Episode 7 - A Thousand Yards
    8.8/10(564 votes)

    #7 - A Thousand Yards

    S21:E7

    NCIS comes under attack by a mysterious enemy from the past.

    Director:Diana Valentine
    Writer:Christopher J. Waild

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  8. NCIS Season 21 Episode 8 - Heartless
    8.0/10(371 votes)

    #8 - Heartless

    S21:E8

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

    Director:Michael Zinberg
    Writer:Sydney Mitchel

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  9. NCIS Season 21 Episode 9 - Prime Cut
    7.2/10(378 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.

    Director:Diana Valentine
    Writers:Marco Schnabel, Chad Gomez Creasey

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  10. NCIS Season 21 Episode 10 - Reef Madness
    7.7/10(381 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.

    Director:José Clemente Hernandez
    Writer:Scott Williams

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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 474 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".