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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.



Episode characters

Tristan AdamsBerkeleyEliFieldsJamesKarlJames T. KirkRyan LeslieLetheLeonard McCoyHelen NoelSpockNyota UhuraSimon Van GelderVinci[1]unnamed Humansunnamed 2260s USS Enterprise personnel (USS Enterprise personnel)

Novelization characters

Tristan AdamsJames T. KirkLetheLeonard McCoyHelen NoelSpockNyota UhuraSimon Van Gelder

Starships and vehicles

USS Enterprise (Constitution-class heavy cruiser)


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

Shipboard areas

USS Enterprise
bridgetransporter roommedical labsickbay

Planetary locales

Tantalus V
Tantalus colony

Races and cultures


Technology and weapons

communicatorintercomstarshipviewscreenmedical kitmedical tricordersensorstransportertricorderelectroencephalographlibrary computerneural neutralizerphaser pistol

Materials and substances


States and organizations

FederationStarfleetCentral Bureau of Penologynitrogen

Ranks and titles

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

Other references

anatomyarmbootclothingFederation membersfive-year missiongovernmenthumanoidlanguagelifeformlogicmattermemorynation-stateorbitpantsquadrantraces and culturesrankspacestarstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformuniverseweaponChristmascommunicatordelta rhythmdelta waveelectroencephalographneural neutralizerphaserradiologyschizophreniabrandyChristmasdelta 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 media

Tantalus surface. (Decipher RPG module: Worlds)


Video releases


Episode images

Adaptation images


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 link

  1. This character was not named in the episode but the same actor, wearing the same operations division Starfleet uniform, was addressed as Vinci in TOS episode: "The Devil in the Dark". The same actor also played the character of Clifford Brent.