Release calendarTop 250 moviesMost popular moviesBrowse movies by genreTop box officeShowtimes & ticketsMovie newsIndia movie spotlight
    What's on TV & streamingTop 250 TV showsMost popular TV showsBrowse TV shows by genreTV news
    What to watchLatest trailersIMDb OriginalsIMDb PicksIMDb SpotlightFamily entertainment guideIMDb Podcasts
    OscarsEmmysToronto Int'l Film FestivalHispanic Heritage MonthIMDb Stars to WatchSTARmeter AwardsAwards CentralFestival CentralAll events
    Born todayMost popular celebsCelebrity news
    Help centerContributor zonePolls
For industry professionals
  • Language
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Watchlist
Sign in
  • Fully supported
  • English (United States)
    Partially supported
  • Français (Canada)
  • Français (France)
  • Deutsch (Deutschland)
  • हिंदी (भारत)
  • Italiano (Italia)
  • Português (Brasil)
  • Español (España)
  • Español (México)
Use app
Star Trek
S2.E6
All episodesAll
  • Cast & crew
  • User reviews
  • Trivia
IMDbPro

The Doomsday Machine

  • Episode aired Oct 20, 1967
  • TV-PG
  • 50m
IMDb RATING
8.6/10
5K
YOUR RATING
Star Trek (1966)
Space Sci-FiActionAdventureDramaSci-Fi

The USS Enterprise encounters the wrecked USS Constellation and its distraught commodore who's determined to stop the giant planet-destroying robot ship that killed his crew.The USS Enterprise encounters the wrecked USS Constellation and its distraught commodore who's determined to stop the giant planet-destroying robot ship that killed his crew.The USS Enterprise encounters the wrecked USS Constellation and its distraught commodore who's determined to stop the giant planet-destroying robot ship that killed his crew.

  • Director
    • Marc Daniels
  • Writers
    • Gene Roddenberry
    • Norman Spinrad
  • Stars
    • William Shatner
    • Leonard Nimoy
    • DeForest Kelley
  • See production info at IMDbPro
  • IMDb RATING
    8.6/10
    5K
    YOUR RATING
    • Director
      • Marc Daniels
    • Writers
      • Gene Roddenberry
      • Norman Spinrad
    • Stars
      • William Shatner
      • Leonard Nimoy
      • DeForest Kelley
    • 50User reviews
    • 13Critic reviews
  • See production info at IMDbPro
  • See production info at IMDbPro
  • Photos35

    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    View Poster
    + 28
    View Poster

    Top cast17

    Edit
    William Shatner
    William Shatner
    • Captain James T. Kirk
    Leonard Nimoy
    Leonard Nimoy
    • Mr. Spock
    DeForest Kelley
    DeForest Kelley
    • Dr. Leonard McCoy
    William Windom
    William Windom
    • Commodore Decker
    James Doohan
    James Doohan
    • Montgomery Scott 'Scotty'
    George Takei
    George Takei
    • Hikaru Sulu
    Elizabeth Rogers
    Elizabeth Rogers
    • Lt. Palmer
    John Winston
    John Winston
    • Lt. Kyle
    Richard Compton
    • Washburn
    John Copage
    • Elliott
    Tim Burns
    • Russ
    Jerry Catron
    Jerry Catron
    • Montgomery
    Bill Blackburn
    • Lieutenant Hadley
    • (uncredited)
    Roger Holloway
    • Lt. Lemli
    • (uncredited)
    Jeannie Malone
    • Yeoman
    • (uncredited)
    Eddie Paskey
    Eddie Paskey
    • Lieutenant Leslie
    • (uncredited)
    Frieda Rentie
    • Enterprise Lieutenant
    • (uncredited)
    • Director
      • Marc Daniels
    • Writers
      • Gene Roddenberry
      • Norman Spinrad
    • All cast & crew
    • Production, box office & more at IMDbPro

    User reviews50

    8.64.9K
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10

    Featured reviews

    10fabian5

    One of the very best original Star Trek episodes

    After 'Mirror Mirror' this episode ranks as one of the very best Star Trek shows in the second season of the Original series. It is even better than 'The Trouble with Tribbles.' I just viewed a taped copy of it and the sci-fi work done here was incredible for a 1960's era show: you get to see the Enterprise's shuttle bay when Commander Decker exits the ship and unforgettable images of the Doomsday machine itself. NBC must have spent a ton of money on this particular episode.

    Kirk, Spock and Decker's performances here are superb as all three get their turn playing cat and mouse with a deadly planet eating machine. It flat out deserves a 10 out of 10 ranking in my view and should be among anyone's top 10 Star Trek picks. Scotty also has a starring role--saving Kirk's life at the very last minute. The only missing original Trek character is Uhura who was played by Lieutenant Palmer (the late Elizabeth Rogers) for this particular episode.
    8mstomaso

    Classic TOS War Story

    The Doomsday Machine is a war story at many levels. It is the story of war spun out of control exemplified by a self-sustaining ancient device which seeks, destroys and digests whole solar systems. It is a story about military conduct aboard Federation ships. And it is, of course, a parable connected to the development and proliferation of nuclear arms. Despite all this heady stuff, it is also one of the most suspenseful and driven episodes of TOS. It is remarkable that so many viewers seem to miss the obvious points made here now that we have deluded ourselves into believing that the bomb is no longer something to be afraid of.

    The plot uses a simple device - a large, impenetrable and incomprehensible rocky-looking cone with some form of bizarre and very powerful energy within it - perhaps one of the strangest and most alien space monsters ever construed. Two starships, one crew-less and crippled, and one experiencing a power-struggle involving a possibly insane commander must figure out a way to survive and warn star fleet as the 'planet killer' is just about to reach a system inhabited by millions of colonists.

    Marc Daniels' directing and an amazing performance by William Windom as Commodore Decker, CO of the Constellation, are highlights of this classic episode. The Norman Spinrad script is quite serious, but not at all heavy-handed, and the regular cast, especially Nimoy, also do outstanding work.
    10john-1451

    One of the best

    One of the reasons the original series is thought of so highly is that certain individual episodes (City on the Edge of Forever, Journey to Babel, Balance of Terror and this one) are as good as anything you will see on movies or TV. This episode highlights some the things that made TOS great: Lighting, set design, and the acting. For all the grief Shatner receives as an actor, in this episode he really nails what makes Kirk a great captain. He is confident, forceful, able to think on his feet and fully in command. The color scheme, which employs bright primary colors, and the eye light they use on Kirk to highlight his sense of command are excellent. And don't forget the writing and directing that fully makes use of the tension inherent in the situation. You will never see a better straight ahead action episode on TV than The Doomsday Machine.
    9Hitchcoc

    Nice Parry and Thrust Maintains Interest to the End

    Coming off the last clunker of an episode (Apple), this is a breath of fresh air. Starship Captain Dekker is rescued. He is the last survivor of a ship that lost all of its crew. A killer entity of great power was responsible but some poor decisions were also made. Now Dekker becomes obsessed with destroying this thing. While Kirk is away, trying to repair the other Captain's ship, communications is circumvented, allowing Dekker, crazy as he is, to take over the Enterprise. He decides to wage war on the thing again, endangering another crew. The episode draws on some wonderful twists and turns as Kirk has to deal with Dekker and then with the force that is now a danger to everyone. This is a superior effort, stepping up from some pretty suspect efforts.
    10sixwest190

    An example of TOS Greatness

    One of the things I always think about when it comes to Star Trek TOS is what makes these classic episodes so great is how alot of them could have been made into full-length movies. The Doomsday Machine in my opinion is absolutely Number One when it comes to this. A thrilling adventure crammed into 45 minutes with great performances from the entire cast. William Windom gives the greatest guest star performance in the entire series no question.

    Related interests

    Leonard Nimoy and William Shatner in Star Trek (1966)
    Space Sci-Fi
    Bruce Willis in Die Hard (1988)
    Action
    Still frame
    Adventure
    Mahershala Ali and Alex R. Hibbert in Moonlight (2016)
    Drama
    James Earl Jones and David Prowse in Star Wars: Episode V - The Empire Strikes Back (1980)
    Sci-Fi

    Storyline

    Edit

    Did you know

    Edit
    • Trivia
      James Doohan's favorite episode for its highlighting of the engineering aspects of the Star Trek world.
    • Goofs
      Decker is clearly unfit for command when he takes the Enterprise. When McCoy first finds him, he's in a state of extreme shock and borderline catatonic, and even after McCoy gives him a shot to bring him out of it, he slips in and out of complete hysteria. McCoy would easily be able to prove this should Starfleet make an issue of it, particularly since as CMO, he has the authority to order a physical or psychological examination of any crewman serving on the Enterprise (as Decker now is) at his discretion.
    • Quotes

      Capt. Kirk: Mr. Spock, relieve Commodore Decker immediately. That's a direct order.

      Matt Decker: You can't relieve me and you know it, according to regulations...

      Capt. Kirk: BLAST REGULATIONS! Mr. Spock, I order you to assume command on my personal authority as Captain of the Enterprise.

      Mr. Spock: Commodore Decker, you are relieved of command.

      Matt Decker: I don't recognize your authority to relieve me.

      Mr. Spock: You may file a formal protest with Starfleet Command, assuming we survive to reach a Starbase, but you are relieved. Commodore, I do not wish to place you under arrest.

      Matt Decker: You wouldn't dare.

      [Mr. Spock signals two security guards who immediately step forward at his command]

      Matt Decker: You're bluffing.

      Mr. Spock: Vulcans never bluff.

      Matt Decker: [sadly] No. No, I don't suppose that they do. Very well, Mr. Spock, the bridge is yours.

    • Alternate versions
      Special Enhanced version Digitally Remastered with new exterior shots and remade opening theme song. Highlights include Decker's shuttle impatiently taking off before the hangar doors had fully opened.
    • Connections
      Featured in Star Trek: Nemesis Review (2009)
    • Soundtracks
      Theme
      Music credited to Alexander Courage

      Sung by Loulie Jean Norman

    Top picks

    Sign in to rate and Watchlist for personalized recommendations
    Sign in

    Details

    Edit
    • Release date
      • October 20, 1967 (United States)
    • Country of origin
      • United States
    • Official sites
      • handitv
      • Official Facebook
    • Language
      • English
    • Filming locations
      • Desilu Studios - 9336 W. Washington Blvd., Culver City, California, USA
    • Production companies
      • Desilu Productions
      • Norway Corporation
    • See more company credits at IMDbPro

    Tech specs

    Edit
    • Runtime
      • 50m
    • Color
      • Color
    • Sound mix
      • Mono
    • Aspect ratio
      • 4:3

    Contribute to this page

    Suggest an edit or add missing content
    • Learn more about contributing
    Edit page

    More to explore

    Recently viewed

    Please enable browser cookies to use this feature. Learn more.
    Get the IMDb App
    Sign in for more accessSign in for more access
    Follow IMDb on social
    Get the IMDb App
    For Android and iOS
    Get the IMDb App
    • Help
    • Site Index
    • IMDbPro
    • Box Office Mojo
    • License IMDb Data
    • Press Room
    • Advertising
    • Jobs
    • Conditions of Use
    • Privacy Policy
    • Your Ads Privacy Choices
    IMDb, an Amazon company

    © 1990-2025 by IMDb.com, Inc.