Star Trek: Season 2, Episode 6

The Doomsday Machine (20 Oct. 1967)

TV Episode  -   -  Action | Adventure | Sci-Fi
Your rating:
    1 2 3 4 5 6 7 8 9 10 -/10 X  
Ratings: 8.8/10 from 1,156 users  
Reviews: 25 user | 7 critic

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



(created by),
0Check in

Watch Now

$0.00 with Prime Instant Video

User Lists

Related lists from IMDb users

a list of 21 titles
created 09 Dec 2011
a list of 5981 titles
created 08 Jan 2012
a list of 26 titles
created 19 Aug 2012
a list of 44 titles
created 03 Jun 2013
a list of 30 titles
created 6 months ago

Related Items

Connect with IMDb

Share this Rating

Title: The Doomsday Machine (20 Oct 1967)

The Doomsday Machine (20 Oct 1967) on IMDb 8.8/10

Want to share IMDb's rating on your own site? Use the HTML below.

Take The Quiz!

Test your knowledge of Star Trek.
« Previous Episode | 36 of 80 Episodes | Next Episode »





Episode complete credited cast:
Elizabeth Rogers ...
John Winston ...
Richard Compton ...
Lt. Washburn
John Copage ...
Tim Burns ...
Jerry Catron ...


The U.S.S. Constellation and its crew were destroyed by a giant robot ship which consumes planets for fuel, leaving only a guilt-ridden Commodore Decker aboard the crippled ship. Kirk beams over to begin repairs while Decker beams aboard the Enterprise. After Kirk loses radio contact with the Enterprise, the obsessed Commodore seizes command of the starship, determined to destroy the planet-killer, even at the cost of Kirk's ship and the entire crew. Written by

Plot Summary | Plot Synopsis


See all certifications »


Official Sites:



Release Date:

20 October 1967 (USA)  »

Company Credits

Show detailed on  »

Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
See  »

Did You Know?


This episode marks the debut of the re-designed engineering set. The dilithium crystal storage units now occupy the center of the floor (complete with recycled Horta eggs), a ladder and upper level have been added into what was just a high bank of lighted panels in the first season. The set also is entered through a short spur hallway now, rather than as a side door off a main corridor. The console across from the forced-perspective end of the set has been replaced by a doorway and moved to the main wall to the left of the red grid. The huge structures among which Kirk's evil self and Ben Finney once hid are not seen in detail again, but the emergency manual monitor set was built on stilts on that spot, making its debut in "Mirror, Mirror". See more »


When Commodore Decker and the security guard fight during Decker's escort to sickbay, it's easily seen that a stunt double is portraying Decker. See more »


Mr. Spock: It's closing fast on the Constellation.
Sulu: Standing by, sir.
Mr. Spock: Commodore, I suggest...
Matt Decker: Kirk pulled us out of there by distracting it. Now it's our turn. Fire phasers.
[the Enterprise fires upon the planet-killer, causing it to release the Constellation]
Matt Decker: Did it! Hard about! Give me some distance.
[the Enterprise veers sharply to the left, away from the planet-killer]
See more »


Referenced in Star Trek: The Motion Picture (1979) See more »

Frequently Asked Questions

This FAQ is empty. Add the first question.

User Reviews

Bogart and Commodore Decker
10 July 2010 | by (France) – See all my reviews

I love the way the Commodore channels Queeg in the Mutiny on the Caine. He plays around with the memory cards, just like Queeg plays with his objects. Although that makes for uncomfortable viewing, since I agree with José Ferrer's character that the Caine crew behaved badly. Though I don't see what else Spock and McCoy could have done. They tried to get him medical help, and contrary to Queeg, the Commodore doesn't ask for help.

Great episode, fabulous acting all round. I love Shatner's constipated expression when they "won't" beam him aboard.

Nimoy is first class too. I love it when he gets all steely (like in Mirror, Mirror as the "bad" Spock.

Shame about the robot, was it papier mâché? Definitely a reason to buy the re-mastered season 2!

1 of 2 people found this review helpful.  Was this review helpful to you?

Message Boards

Recent Posts
Where do you start? Erdago
Things that bugged you when you watched as a kid flashgordan
William Shatner as Captain Kirk, A++ gavbrown01
Why "What Little Girls Are Made Of" is such a great ep gavbrown01
Wink of an Eye: a particularly good ep gavbrown01
What does it say about this show that people are still talking about it? gavbrown01
Discuss The Doomsday Machine (1967) on the IMDb message boards »

Contribute to This Page

Create a character page for: