Memory Beta, non-canon Star Trek Wiki

A friendly reminder regarding spoilers! At present the expanded Trek universe is in a period of major upheaval with the finale of Year Five, the Coda miniseries and the continuations of Discovery, Picard and Lower Decks; and the premieres of Prodigy and Strange New Worlds, the advent of new eras in Star Trek Online gaming, as well as other post-55th Anniversary publications. Therefore, please be courteous to other users who may not be aware of current developments by using the {{spoiler}}, {{spoilers}} or {{majorspoiler}} tags when adding new information from sources less than six months old. Also, please do not include details in the summary bar when editing pages and do not anticipate making additions relating to sources not yet in release. 'Thank You


Memory Beta, non-canon Star Trek Wiki

"Spock's Brain" was the 61st episode of Star Trek: The Original Series, and the sixth episode produced in the third and final season of TOS. Shown out of order, this episode was aired as the season premiere of the third season on 20 September 1968. Directed by Marc Daniels, this episode was written by Lee Cronin. A remastered version was released on 9 June 2007.



Episode characters

Clifford Brent[1]Christine ChapelPavel ChekovBill HadleyKaraJames T. KirkRoger LemliRyan LeslieLumaLeonard McCoyMontgomery ScottSpockHikaru SuluNyota Uhuraunnamed USS Enterprise (NCC-1701) personnelUnnamed Morgs

Novelization characters

Christine ChapelPavel ChekovKaraJames T. KirkLumaLeonard McCoyMontgomery ScottSpockHikaru SuluNyota Uhura

Starships and vehicles

Eymorg starshipUSS Enterprise (Constitution-class heavy cruiser)


Shipboard locations


Stars and systems

Sigma Draconis

Planets and planetoids

Sigma Draconis IIISigma Draconis IVSigma Draconis VI
Referenced only

Races and cultures

HumanSigma Draconis VI native (MorgEymorg) • Vulcan

States and organizations





autonomic nervous systembloodboilbrain (ganglionmedulla oblongataspeech center) • nervestomachvocal cord

Technology and weapons

biobedcommunicatorcomputercontrol braceletControllerelevatorUSS Enterprise (NCC-1701) library computerforgeGreat Teacherhand-held weaponheating plantion driveion propulsionmagnetic lockneedleneural stimulatornuclear pilepain bandphaserphaser pistolpistolremote controlsensorsledgehammersonic separatorspaceshipstarshiptapetraining devicetransferal beamtri-laser connectortransportertricorderturbolifttype-2 phaserviewscreenwater purifier

Substances and energies

iceionion powerion trailnitrogenoxygenwater

Ranks and titles

captainchief engineerchief medical officercommandercommanding officercommunications officerdoctorensignFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerhelmsmanlieutenantlieutenant commandermanagermistressnavigatorpriestessscience officersecuritytactical officer

Other references

alienanatomyatrophybreadcaptain's logcaptain's log, USS Enterprise (NCC-1701), 2268cityclass M planetclothingcommunicationsdeaction shiftenergyevolutiongalaxyglacial agegovernmenthourindustrial developmentindustrial scalelanding partylife supportlifeformlog entrymilematternation-stateorbitphysiologyplanetplanetary classificationraces and culturesrankRichter scale of culturesapient lifeship's logship's log, USS Enterprise (NCC-1701)spacesplinterstandard interstellar symbolsstarstar systemStarfleet uniformStarfleet uniform (2265-2270)starship designstellar classificationsurgerytechnologytemperaturetimetitleuniformuniversevolcanoVulcan physiologyweapon


Earth's technological and civilizational development in 1485 had an industrial scale rating of "B" and closely matched the development of the inhabitants of Sigma Draconis III in 2268. (episode)
Earth's technological and civilizational development in 2030 had an industrial scale rating of "G" and closely matched the development of the inhabitants of Sigma Draconis IV in 2268. (episode)
Enterprise encounters the Eymorg starship. (episode)
24th century
By the 24th century, many Starfleet officers had come to believe the logs of this event were fabricated and had little-to-no basis in reality. (NF - Prometheans novel: Martyr)


Related media


Video releases


Episode images

Adaptation images



published order
Previous episode:
And the Children Shall Lead
TOS episode produced Next episode:
Is There in Truth No Beauty?
Previous episode:
Assignment: Earth
TOS episode aired Next episode:
The Enterprise Incident
Previous story:
first story
Star Trek 8
Next story:
The Enemy Within
chronological order
Previous Adventure:
Dreams of the Raven
Pocket Next Adventure:
How Much for Just the Planet?
Previous Adventure:
Dreams of the Raven
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
How Much for Just the Planet?

External links

  1. This character was not named in the episode but the same actor, wearing an officer's Starfleet uniform, was addressed as Brent in TOS episode: "The Naked Time". The same actor also played the character of Vinci.