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"Let That Be Your Last Battlefield" was the 70th episode of Star Trek: The Original Series, the 15th episode of the show's third and final season, first aired on 10 January 1969. The episode was written by Lee Cronin and Oliver Crawford, directed by Jud Taylor and novelized in Star Trek 5 by James Blish.


On a mission to decontaminate the planet Ariannus, the Enterprise retrieves a stolen shuttlecraft with one person aboard—Lokai—who is white on the right side of his body and black on his left side. An invisible spacecraft comes straight toward the Enterprise and leaves its pilot aboard before being destroyed. The pilot is Bele who is black on the right side of his body and white on his left side. Bele is a police commissioner from the planet Cheron V who has been chasing Lokai for 50,000 years across the galaxy. Although slavery was abolished on Cheron the ruling class is Bele's color and the ruled class is Lokai's color.

Lokai tries to enlist the Enterprise crew in his crusade and Bele claims to be superior color to Lokai to James T. Kirk and Spock. When the Federation refuses to honor Bele's request for custody of Lokai, Bele with the power of his will tries to hijack the Enterprise to Cheron in a standoff with Kirk who for his part activates the self destruct—which is only averted when Bele agrees to turn over control of the starship to Kirk.

When Ariannis is decontaminated, Bele hijacks the Enterprise again—after destroying the self destruct with his will. On arrival at Cheron, the ships sensors show that the entire humanoid population has wiped out one another. Lokai transports himself down to Cheron followed by Bele.

Log entries

Captain's log, stardate 5730.2. 
The planet Ariannus is vital as a transfer point on regular space commercial lanes. It has been attacked by a bacterial invasion which threatens to render it lifeless unless checked. Our mission, to decontaminate it.
Captain's log, stardate 5730.7. 
Having completed our mission to Ariannus, the Enterprise is now on course to Starbase 4. The crew is on normal routine and we are proceeding without incident.
Captain's log 5730.6. 
In a deliberate act of sabotage, Commissioner Bele has burned out our destruct mechanism and, through the power of his will, has again taken over directional control of the Enterprise.



Episode characters

BeleClifford Brent[1]Christine ChapelPavel ChekovBill HadleyJames T. KirkRoger LemliLokaiLeonard McCoyMontgomery ScottSpockHikaru SuluNyota UhuraVinci[2]USS Enterprise computerunnamed USS Enterprise (NCC-1701) personnel
Referenced only 
Gregor Johann Mendel

Novelization characters

BeleChristine ChapelPavel ChekovJames T. KirkLokaiLeonard McCoyMontgomery ScottSpockHikaru SuluNyota Uhura

Starships and vehicles

USS Enterprise (Constitution-class heavy cruiser) • Cheron scout vesselda Vinci (class F shuttlecraft)


AriannusCheron (the galaxy's Beta Quadrant)
Referenced only 
CoalsackEarthStarbase 4

Shipboard areas

USS Enterprise 
bridgetransporter roomhangar deckrecreation room

Planetary locales

Cheron city


Races and cultures

Referenced only 

Technology and weapons


Materials and substances


States and organizations

Commission on Political TraitorsMinistry of HealthStarfleetStarfleet CommandUnited Federation of Planets

Ranks and titles

bureaucratcaptainchief engineerchief medical officercommandercommanding officercommunications officercommissionerdiplomatdoctorengineerFederation Starfleet ranksFederation Starfleet ranks (2260s)first officerlieutenantlieutenant commanderhelmsmanmedical practitionernavigatorofficerscientistscience officersecond officerweapons officertactical officerpilotpolice

Other references

commercewarp 10self destruct20th centuryapebacteriabloodCivil Rights Movementcommand frequency 2commissionerdeath warrantdestruct sequencedirectional controldue processevolutionextinctionextraditiongenocidehistoryhull breachintergalactic treatylavalogicmaster computermaster racememory banknucleotideoxygenpolitical asylumracismrecuperative powersred alertsabotagescopeself destructshieldsskinslaveryspray tanktractor beamvocal cordsvolcanoanatomyarmbeamingbootcaptain's logcaptain's log, USS Enterprise, 2268cityclothingcoordinatesdiplomacydiseaseFederation membersfingerfive-year missiongermgovernmenthomeworldhourhumanoidjumpsuitlanguagelifeformlog entrylogicmattermemorymicrobemicroorganismnation-stateorbitpantsplanetpokerpopulationquadrantraces and culturesrankregulationship's logship's log, USS Enterprisespacestarstar systemstardateStarfleet uniformStarfleet uniform (2260s)technologytitletunicuniformuniverseweapon


years prior to 2268 
Lokai organizes revolutions among the enslaved on Cheron. (prior to episode/novelization)
stardate 5430.2, 2268 (2260s chronology, 2264–2270 Enterprise voyages
Enterprise travels to Ariannus.


Related media




Star Trek: The Original Series episodes and movies
Season 1 The Cage • "Where No Man Has Gone Before" • "The Corbomite Maneuver" • "Mudd's Women" • "The Enemy Within" • "The Man Trap" • "The Naked Time" • "Charlie X" • "Balance of Terror" • "What Are Little Girls Made Of?" • "Dagger of the Mind" • "Miri" • "The Conscience of the King" • "The Galileo Seven" • "Court Martial" • "The Menagerie" • "Shore Leave" • "The Squire of Gothos" • "Arena" • "The Alternative Factor" • "Tomorrow is Yesterday" • "The Return of the Archons" • "A Taste of Armageddon" • "Space Seed" • "This Side of Paradise" • "The Devil in the Dark" • "Errand of Mercy" • "The City on the Edge of Forever" • "Operation -- Annihilate!"
Season 2 "Catspaw" • "Metamorphosis" • "Friday's Child" • "Who Mourns for Adonais?" • "Amok Time" • "The Doomsday Machine" • "Wolf in the Fold" • "The Changeling" • "The Apple" • "Mirror, Mirror" • "The Deadly Years" • "I, Mudd" • "The Trouble with Tribbles" • "Bread and Circuses" • "Journey to Babel" • "A Private Little War" • "The Gamesters of Triskelion" • "Obsession" • "The Immunity Syndrome" • "A Piece of the Action" • "By Any Other Name" • "Return to Tomorrow" • "Patterns of Force" • "The Ultimate Computer" • "The Omega Glory" • "Assignment: Earth"
Season 3 "Spectre of the Gun" • "Elaan of Troyius" • "The Paradise Syndrome" • "The Enterprise Incident" • "And the Children Shall Lead" • "Spock's Brain" • "Is There in Truth No Beauty?" • "The Empath" • "The Tholian Web" • "For the World is Hollow and I Have Touched the Sky" • "Day of the Dove" • "Plato's Stepchildren" • "Wink of an Eye" • "That Which Survives" • "Let That Be Your Last Battlefield" • "Whom Gods Destroy" • "The Mark of Gideon" • "The Lights of Zetar" • "The Cloud Minders" • "The Way to Eden" • "Requiem for Methuselah" • "The Savage Curtain" • "All Our Yesterdays" • "Turnabout Intruder"
TAS "Beyond the Farthest Star" • "Yesteryear" • "One of Our Planets Is Missing" • "The Lorelei Signal" • "More Tribbles, More Troubles" • "The Survivor" • "The Infinite Vulcan" • "The Magicks of Megas-Tu" • "Once Upon a Planet" • "Mudd's Passion" • "The Terratin Incident" • "The Time Trap" • "The Ambergris Element" • "The Slaver Weapon" • "The Eye of the Beholder" • "The Jihad" • "The Pirates of Orion" • "Bem" • "The Practical Joker" • "Albatross" • "How Sharper Than a Serpent's Tooth?" • "The Counter-Clock Incident"
Movies The Motion PictureThe Wrath of KhanThe Search for SpockThe Voyage HomeThe Final FrontierThe Undiscovered CountryStar TrekStar Trek Into DarknessStar Trek Beyond


published order
Previous episode:
That Which Survives
TOS episode produced Next episode:
Whom Gods Destroy
Previous episode:
Whom Gods Destroy
TOS episode aired Next episode:
The Mark of Gideon
Previous story:
The Tholian Web
Star Trek 5
Next story:
This Side of Paradise
chronological order
Previous Adventure:
A Sucker Born
Pocket Next Adventure:
Whom Gods Destroy
Previous Adventure:
Mudd in Your Eye
Voyages of the
USS Enterprise (NCC-1701)
(2264 to 2270)
Next Adventure:
Crisis on Centaurus

External links

  • 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.
  • 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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