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"One of Our Planets Is Missing" was the third episode of Star Trek: The Animated Series. It was produced in TAS' first season and debuted on 22 September 1973. The episode was directed by Hal Sutherland and written by Marc Daniels, a director of 14 TOS episodes. The story was novelized in Star Trek: Log One by Alan Dean Foster in June 1974.

In this story, Captain James T. Kirk was faced with destroying the USS Enterprise in order to save the lives of 82 million people.


VHS teaser
The crew of the USS Enterprise jumps into action when an immense cosmic cloud enters the galaxy and threatens to destroy the most remote, but inhabited, planet in the Federation.

Log entries

Captain's log, stardate 5371.3. A huge cosmic cloud has been reported moving into the outer fringe of our galaxy. Nothing like it has ever been seen before. Starfleet Command has sent the Enterprise to investigate as we're the only vessel in the vicinity of the phenomenon. Our present position is in the Pallas Fourteen system, which contains Mantilles, the most remote inhabited planet in the entire Federation.

Captain's log, supplemental. At warp eight, we will intercept the cloud before it reaches the inhabited planet Mantilles. But we are uncertain what we can do to stop a matter-energy cloud which measures thousands of times more than our vessel.

Captain's log, supplemental. The Enterprise has only fifteen minutes left before her power is drained and we are left helpless.

Captain's log, stardate 5372.0. Spock and Uhura are using our sensors to prepare a detailed chart so we may determine targets for our photon torpedoes.

Captain's log, stardate 5372.1. The cloud will reach Mantilles in seven minutes. Spock has been working on the mechanics of reaching the cloud's thoughts, but I doubt if there's any time left. And even if we do establish contact, can we communicate with it and persuade it not to kill?

Captain's log, stardate 5372.1. This may well be the last entry in the log of the USS Enterprise. It is only a matter of minutes before the cosmic cloud referred to in previous entry reaches Mantilles. Science officer Spock has been working on the problems involved in reaching the cloud's thoughts – if it has any. But even should he succeed, I doubt there is enough time left for any meaningful exchange to take place. The possibility that we could persuade it to avoid Mantilles is... (Novelization)



Episode characters

Arex Na EthJames T. KirkJohn KyleLeonard McCoyMontgomery ScottSpockHikaru SuluNyota UhuraRobert WesleyCosmic cloud
Referenced only
Frank GablerKatie Wesley

Novelization characters

Arex Na EthJames T. KirkJohn KyleLeonard McCoyMontgomery ScottSpockHikaru SuluNyota UhuraRobert WesleyCosmic cloud
Referenced only
DavisGodKatie Wesley

Starships and vehicles

USS Enterprise (Constitution-class)
Referenced only
evacuation ships


Pallas 14 system (AlondraBezarideMantilles)
Referenced only
Earth (North America) • JupiterMilky Way GalaxyNeptuneSaturn

Races and cultures

HumanEdosian or TriexianVulcan

States and organizations

StarfleetStarfleet CommandUnited Federation of Planets

Science and technology

antimatter chargeantimatter enginechemical identity sensorschronometercomputerdeflector shieldengineering coreforcefieldlibrary computermatter enginecourier torpedoperiodic tablephaserpriority 1 callphoton torpedophysicspsychologyquartersremote controlscannersensorsplintsubspace radiotractor beamtransporterturboliftuniversal translatorwarp nacelle


ambiplasmaanatomybraindigestive systemkoinoenergymacromorphase enzymesmall intestinestomachvillus

Units of measurement


Ranks and titles

captainchief engineerdoctorengineerFederation Starfleet ranks (2260s)first officergovernorhelmsmanlieutenantnavigatorrankStarfleet rankstechnician


amoebaantimatterassignment patchauto-destructbridgebullelectricityelementenergyengineeringevasive actiongalaxygasjudgelanguagematterself-destructsickbayStarfleet General Orders and RegulationsStarfleet uniformStarfleet uniform (2265-2270)transporter roomunicornuniverseVulcan mind touchwarp speed (warp eight)



  • Kirk left the bridge to talk with Wesley privately in his quarters, but the room shown in the episode was the briefing room.


  • The story was set 54 hours after the events of TAS episode & novelization: Yesteryear.
  • The novelization confirmed that Kirk and Scott brought antimatter inside the warp nacelle.
  • Hikaru Sulu broke his left leg during the buffeting endured by the Enterprise as it was engulfed by the creature. Kirk ordered him to report to sickbay, but Sulu asked to remain at his station. McCoy applied a temporary splint to the leg.
  • Robert Wesley swore at Kirk in a frustrated outburst, then apologized.
  • Following the ship's exit from the cloud, The Enterprise helped the fleet of evacuation ships return to Mantilles.

Related stories


published order
Previous episode:
The Lorelei Signal
TAS episode produced Next episode:
Mudd's Passion
Previous episode:
TAS episode aired Next episode:
The Lorelei Signal
Previous story:
Log One
Logs One.jpg
Next story:
last story
chronological order
Previous Adventure:
The Vanished
Memory Beta Chronology Next Adventure:
The Survivor
Previous Adventure:
Pocket Next Adventure:
The Survivor


External link