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Dagger of the Mind

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"Dagger of the Mind" was the 11th episode of Star Trek: The Original Series, the 10th episode of the show's first season, first aired on 3 November 1966. The episode was written by S. Bar-David, directed by Vincent McEveety and novelized in Star Trek 1 by James Blish.



Tristan AdamsBerkeleyEliFieldsSimon Van GelderKarlJames T. KirkEd LeslieLetheLeonard McCoyHelen NoelSpockNyota UhuraVinciunnamed Humansunnamed USS Enterprise (NCC-1701) personnel (USS Enterprise (NCC-1701) personnel)

Starships and vehiclesEdit

USS Enterprise (Constitution-class heavy cruiser)


Tantalus V (Tantalus system, the galaxy's Alpha or Beta Quadrants)
Referenced only 
Stockholm, Sweden (Earth)

Shipboard areasEdit

USS Enterprise 
bridgetransporter roommedical labsickbay

Planetary localesEdit

Tantalus V 
Tantalus colony

Races and culturesEdit


Technology and weaponsEdit

communicatorintercomstarshipviewscreenmedical kitmedical tricordersensorstransportertricorderelectoencephalographlibrary computerneural neutralizerphaser pistol

Materials and substancesEdit


States and organizationsEdit

FederationStarfleetCentral Bureau of Penologynitrogen

Ranks and titlesEdit

assistantcaptainchief medical officercommandercommanding officercommunications officercrewmandirectordoctorengineerFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerlieutenantlieutenant commanderhelmsmanmedical practitionernavigatorofficerscientistscience officerweapons officertactical officermedical officer

Other referencesEdit

anatomyarmbootclothingFederation membersfive-year missiongovernmenthumanoidlanguagelifeformlogicmattermemorynation-stateorbitpantsquadrantraces and culturesrankspacestarstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformuniverseweaponChristmascommunicatordelta rhythmdelta waveelectroencephalographneural neutralizerphaserradiologyschizophrenia
brandyChristmasdelta wavepenal colonytranquilizing drug


prior to 2266 
Kirk attends the Christmas party. (prior to episode/novelization)
stardate 2715.1, 2266 (2260s chronology, 2264–2270 Enterprise voyages
Enterprise travels to Tantalus.


Related storiesEdit


Tantalus surface. (Decipher RPG module: Worlds)



published order
Previous episode:
What Are Little Girls Made Of?
TOS episode produced Next episode:
Previous episode:
TOS episode aired Next episode:
The Corbomite Maneuver
Previous story:
Charlie's Law
Star Trek 1
Next story:
The Unreal McCoy
chronological order
Previous Adventure:
River of Blood
Errand of Vengeance
Pocket Next Adventure:
Previous Adventure:
River of Blood
Errand of Vengeance
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:

External linksEdit

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