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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 tricordersensorstransportertricorderelectoencephalographlibrary 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[]

  • 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.
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