"The Doomsday Machine" was the 35th episode of Star Trek: The Original Series, the 6th episode of the show's second season, first aired on 20 October 1967. The episode was written by Norman Spinrad, directed by Marc Daniels and novelized in Star Trek 3 by James Blish.



Episode charactersEdit

Matthew DeckerElliottKaren GreeneBill HadleyJamesJames T. KirkJohn KyleRoger LemliRyan LeslieLeonard McCoyMontgomeryElizabeth PalmerThom ParhamJohn RussMontgomery ScottSpockHikaru SuluNyota UhuraRichard Washburn

Novelization charactersEdit

Brand DeckerJames T. KirkLeonard McCoyMontgomery ScottSpockHikaru SuluNyota Uhura

Starships and vehiclesEdit

Einstein (class F shuttlecraft) • USS Constellation (Constitution-class) • USS Enterprise (Constitution-class) • Doomsday Machine


M-370 systemVenusRigel systemStarbase 17

Races and culturesEdit


States and organizationsEdit

Starfleet Command

Other referencesEdit

phasermicrotaperobottotal conversion drivescreensEnglishStarfleet Order 1-0-4 Section B Paragraph AStarfleet Order 1-0-4 Section Canti-proton beamneutroniumConstitution-class


Related StoriesEdit



published order
Previous episode:
Amok Time
TOS episode produced Next episode:
Wolf in the Fold
Previous episode:
The Apple
TOS episode aired Next episode:
Previous story:
The Last Gunfight
Star Trek 3
Next story:
Assignment: Earth
chronological order
Previous Adventure:
The Doomsday Gambit
Sections 1-3
Memory Beta Chronology Next Adventure:
The Doomsday Gambit
Sections 4-5
Previous Adventure:
To Reign in Hell: The Exile of Khan Noonien Singh
Chapters 7-11
Pocket Next Adventure:
The First Artifact
First Interlude
Previous Adventure:
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Wolf in the Fold

External linkEdit