Star Trek (1966–1969)
29 user 6 critic

The Doomsday Machine 

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.



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Episode complete credited cast:
Elizabeth Rogers ...
John Winston ...
Richard Compton ...
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


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Release Date:

20 October 1967 (USA)  »

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Technical Specs


Sound Mix:


Aspect Ratio:

1.33 : 1
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Did You Know?


Nichelle Nichols does not appear in this episode. Uhura's duties were assumed by Lt. Palmer, played by Elizabeth Rogers. Walter Koenig is also absent. See more »


Boot scuff marks can be seen on the floor of the corridor before Decker fights the guard, showing that there had been practice or prior takes of the fight. Also, at the end as Decker drags the guard out of the hall into the room, the floor seams appear to be uneven, as if they were coming apart - probably caused during the fight. See more »


Matt Decker: Enterprise to Kirk, Commodore Decker speaking.
Capt. Kirk: Matt? What's going on? Give me Mr. Spock.
Matt Decker: I'm in command here, Jim.
Capt. Kirk: What happened to Spock?
Matt Decker: Nothing. I assumed command, according to regulations, since your first officer was reluctant to take aggressive action against...
Capt. Kirk: You mean YOU'RE the lunatic who's responsible for almost destroying my ship?
Matt Decker: You are speaking to a SENIOR OFFICER, Kirk.
Capt. Kirk: Get me Spock.
Matt Decker: I told you I am in command here, according to every rule in the book, CAPTAIN. If you have ...
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Referenced in Free Enterprise (1998) See more »

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User Reviews

My First Trek!
13 October 2006 | by (Henderson, Nv. USA) – See all my reviews

I was in Army boot camp the summer and fall of '67, and my buddy back home kept telling me about this great new show on TV callled "Star TreK', he said "You gotta see this one, it's the coolest!" I told him, "Nahh, I've seen Lost in Space, it's stupid, i don't care to see another one like that". But when I came home on leave, DOOMSDAY MACHINE was the first Trek episode I saw, I fell on the floor screaming "OH YEAH!! THIS IS IT FOREVER!!" I could'NT believe the magnitude of its coolness and greatness, I was an instant Trekkie, and I've stayed that way for 40 years!! Made all the early cons, even had a silver & red car painted to look like the USS Enterprise,with "NCC-1701" painted across the hood! All it took was one episode to get me hooked for life, and DOOMSDAY MACHINE was the one that did it! Live Long and Prosper!!

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