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The Worst Episodes of Star Trek

Every episode of Star Trek ranked from worst to best. Explore the Worst Episodes of Star Trek!

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The animated adventures of Captain Kirk, Mr. Spock and the crew of the Starship Enterprise.

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Episode Rankings

  1. #1 Worst Episode
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    Star Trek Season 1 Episode 8 - The Magicks of Megas-tu
    5.9/10(1019 votes)

    S1:E8

    Stardate: 1254.4 At the center of the galaxy, the Enterprise discovers a race of powerful aliens.

    Director:Unknown
    Writer:Larry Brody

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  2. Star Trek Season 2 Episode 2 - Bem
    6.1/10(883 votes)

    S2:E2

    Stardate: 7403.6 The Enterprise crew is joined by a unpredictable alien called Ari bn Bem, an independent observer from the planet Pandro.

    Director:Bill Reed
    Writer:David Gerrold

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  3. Star Trek Season 1 Episode 7 - The Infinite Vulcan
    6.2/10(1012 votes)

    S1:E7

    Stardate: 5554.4 A race of plant people, and their master, have a plan to force peace onto the galaxy.

    Director:Unknown
    Writer:Walter Koenig

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  4. Star Trek Season 1 Episode 9 - Once Upon a Planet
    6.2/10(950 votes)

    S1:E9

    Stardate: 5591.2 Kirk returns to the "shore leave" planet, but it's not as peaceful as it was when they last saw it.

    Director:Unknown
    Writer:Chuck Menville

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  5. Star Trek Season 1 Episode 16 - The Jihad
    6.2/10(888 votes)

    S1:E16

    Stardate: 5683.1 Kirk and Spock are recruited for a heist to recover a stolen relic, which if not recovered could spark an galactic jihad.

    Director:Unknown
    Writer:Stephen Kandel

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  6. Star Trek Season 1 Episode 10 - Mudd's Passion
    6.3/10(951 votes)

    S1:E10

    Stardate: 4978.5 Space con artist Harry Mudd returns, selling a fake love potion.

    Director:Unknown
    Writer:Stephen Kandel

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  7. Star Trek Season 1 Episode 13 - The Ambergris Element
    6.4/10(902 votes)

    S1:E13

    Stardate: 5499.9 While exploring the planet Argo, Kirk and Spock are turned into water breathers.

    Director:Unknown
    Writer:Margaret Armen

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  8. Star Trek Season 2 Episode 3 - The Practical Joker
    6.4/10(891 votes)

    S2:E3

    Stardate: 3183.3 The computer of the Enterprise gains partial sentience and starts playing practical jokes on the crew.

    Director:Bill Reed
    Writer:Chuck Menville

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  9. Star Trek Season 2 Episode 5 - How Sharper Than a Serpent's Tooth
    6.4/10(859 votes)

    S2:E5

    Stardate: 6063.4 The Enterprise runs into a being that once visited Earth and influenced the Mayan culture.

    Director:Bill Reed
    Writers:David Wise, Russell Bates

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  10. Star Trek Season 1 Episode 4 - The Lorelei Signal
    6.5/10(1117 votes)

    S1:E4

    Stardate: 5483.7 Female crew members must take over the Enterprise when the men are incapacitated by a race of sirens.

    Director:Unknown
    Writer:Margaret Armen

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  11. Star Trek Season 1 Episode 1 - Beyond the Farthest Star
    6.6/10(1350 votes)

    S1:E1

    Stardate: 5521.3 In orbit around a dead star, the Enterprise comes across a huge starship inhabited by a parasitic life form that threatens the entire ship.

    Director:Unknown
    Writer:Samuel A. Peeples

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  12. Star Trek Season 2 Episode 1 - The Pirates of Orion
    6.6/10(885 votes)

    S2:E1

    Stardate: 6334.1 With Spock stricken down by a fatal disease, the Enterprise must track down the drug that can cure him before it is too late.

    Director:Bill Reed
    Writer:Howard Weinstein

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  13. Star Trek Season 1 Episode 3 - One of Our Planets Is Missing
    6.7/10(1125 votes)

    S1:E3

    Stardate: 5371.3 The crew of the Enterprise races to find a way to stop a cloud from destroying inhabited planets.

    Director:Unknown
    Writer:Marc Daniels

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  14. Star Trek Season 1 Episode 11 - The Terratin Incident
    6.7/10(926 votes)

    S1:E11

    Stardate: 5577.3 The Enterprise crew begins to shrink after radiation exposure.

    Director:Unknown
    Writer:Paul Schneider

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  15. Star Trek Season 1 Episode 15 - The Eye of the Beholder
    6.7/10(885 votes)

    S1:E15

    Stardate: 5501.2 Telepathic aliens put Kirk, Spock and McCoy in a zoo.

    Director:Unknown
    Writer:David P. Harmon

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  16. Star Trek Season 1 Episode 6 - The Survivor
    6.8/10(1038 votes)

    S1:E6

    Stardate: 5143.3 The Enterprise finds a long-lost explorer.

    Director:Unknown
    Writer:James Schmerer

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  17. Star Trek Season 2 Episode 4 - Albatross
    6.8/10(866 votes)

    S2:E4

    Stardate: 5275.6 Dr. McCoy is arrested and held responsible for causing a plague that ravaged the planet Dramia II, where he performed a mass-innoculation 19 years earlier.

    Director:Bill Reed
    Writer:Dario Finelli

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  18. Star Trek Season 1 Episode 12 - The Time Trap
    6.9/10(936 votes)

    S1:E12

    Stardate: 5267.6 The Enterprise crew must work with Klingons to escape from a pocket universe.

    Director:Unknown
    Writer:Joyce Perry

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  19. Star Trek Season 1 Episode 14 - The Slaver Weapon
    7.0/10(950 votes)

    S1:E14

    Stardate: 4187.3 Spock, Sulu, and Uhura discover a time capsule from an ancient and technologically advanced race. However, it draws some unwanted attention.

    Director:Unknown
    Writer:Larry Niven

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  20. Star Trek Season 1 Episode 5 - More Tribbles, More Troubles
    7.1/10(1155 votes)

    S1:E5

    Stardate: 5392.4 Cyrano Jones introduces tribbles that cannot reproduce.

    Director:Unknown
    Writer:David Gerrold

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  21. Star Trek Season 2 Episode 6 - The Counter-Clock Incident
    7.1/10(868 votes)

    S2:E6

    Stardate: 6770.3 With Commodore Robert April (the first commander of the Enterprise) on board, Kirk pursues a ship plunging into a supernova, and enters a universe where time runs backwards.

    Director:Bill Reed
    Writer:Fred Bronson

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  22. Star Trek Season 1 Episode 2 - Yesteryear
    8.1/10(1399 votes)

    S1:E2

    Stardate: 5373.4 Spock travels back in time to prevent his death as a young Vulcan.

    Director:Unknown
    Writer:D.C. Fontana

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Worst Episodes Summary

"The Magicks of Megas-tu" is the worst rated episode of "Star Trek". It scored 5.9/10 based on 1019 votes. Directed by Unknown and written by Larry Brody, it aired on 10/27/1973. This episode scored 0.2 points lower than the second lowest rated, "Bem".