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The Doomsday Machine 

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.


Marc Daniels


Gene Roddenberry (created by), Norman Spinrad




Episode complete credited cast:
William Shatner ... Capt. Kirk
Leonard Nimoy ... Mr. Spock
DeForest Kelley ... Dr. McCoy
William Windom ... Commodore Decker
James Doohan ... Scott
George Takei ... Sulu
Elizabeth Rogers ... Lt. Palmer
John Winston John Winston ... Lt. Kyle
Richard Compton Richard Compton ... Washburn
John Copage John Copage ... Elliott
Tim Burns Tim Burns ... Russ
Jerry Catron ... Montgomery


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 fkelleghan@aol.com

Plot Summary | Plot Synopsis


TV-PG | See all certifications »


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Release Date:

20 October 1967 (USA) See more »

Company Credits

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Technical Specs


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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 »


When Washburn tells Kirk to try activating the Constellation's view screen, before Kirk can see anything but static, he says "What the hell is going on?", as if to say "Why is the Enterprise attacking the Doomsday machine?" See more »


[as the Constellation nears the planet-killer, Kirk presses the detonator, then grabs his communicator]
Capt. Kirk: Beam me aboard!
Mr. Spock: Energize.
Lt. Kyle: Energizing...
[the transporter shorts out]
Lt. Kyle: Bridge, it shorted out again!
Scott: [seeing the short, jumps back into the Jeffries tube] Och...!
Capt. Kirk: [still on the Constellation's bridge] Gentlemen... beam me aboard.
See more »

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. See more »


Referenced in Star Trek Online (2010) See more »

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User Reviews

One of the Top Five Star Trek (TOS) Episodes
6 November 2015 | by jpop59See all my reviews

An exciting "edge of your seat" episode that also manages to highlight the main characters and shows how well they function as a team. Here they are working together to neutralize a so-called "Doomsday Machine" that travels the universe consuming everything in its path (including whole planets). Kirk and Scotty are on board the badly crippled "Constellation" (a twin to the "Enterprise")and work on trying to restore enough power to assist the Enterprise. Meanwhile, on the Enterprise, Spock is in command and is left to deal with the Constellation's lone survivor, Commodore Decker (who is now on a personal mission of his own) and Dr. McCoy who (as usual) is challenging Spock's decisions. Everyone has their shining moment in this one.

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