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"Once Upon a Planet" was the ninth episode of Star Trek: The Animated Series. It was produced in TAS season 1 and debuted on 3 November 1973. The episode was directed by Hal SutherlandMA and written by Len JansonMA and Chuck MenvilleMA. It was the seventh episode to be novelized by Alan Dean Foster, appearing in Star Trek: Log Three in December 1974.

In this sequel to TOS episode: "Shore Leave", the Amusement Park Planet's sentient Master Computer sought a new mission.


The crew of the USS Enterprise returns to a fantasy land planet they once visited for shore leave. But this time the world seems to have lost its charm. This episode is a sequel to the original Star Trek television episode "Shore Leave".

Log entries[]

Episode log entries[]

Captain's log, stardate 5591.2. The crew of the Enterprise is ready for some well-deserved rest and recreation. Therefore we have set course for the so-called "Shore Leave Planet" located in the Omicron Delta region. The uninhabited planet was constructed long ago by a highly advanced alien race. Its sole purpose is to provide fun and amusement for space traveling passers-by.

Captain's log, supplemental. We anticipated nothing more than a period of rest and relaxation on this planet. Instead, Doctor McCoy inexplicably was attacked and Lieutenant Uhura is now missing.

Captain's log, supplemental. We're out of communication with the ship. Our efforts to locate Lieutenant Uhura have been futile, and this once friendly planet has become very dangerous.

Novelization log entries[]

Captain's log, stardate 5510.1. The crew of the Enterprise is ready for some well-deserved rest and recreation. And the sooner the better. Mr. Spock informs me that normal ship efficiency is down twenty-two percent from the standard level — due in part to anticipation of Omicron planetfall.

Having secured the situation on Phylos and submitted the information concerning the mutant clone Stavos Keniclius V and mutant Spock Two – clone of our first officer – to Starfleet sector headquarters, I requested that the crew be granted something special in the way of shore leave. Said request to visit the Omicron region was duly submitted and approved.

Course was set and traced without incident. We are now approaching the so-called 'shore-leave' world. Those studying this log may recall that this particular planet was programmed long ago by some unknown but highly advanced alien race. The extremely complex machinery installed there is designed solely to provide fun and amusement for interstellar passersby. Its extensive mind-reading devices and attendant manufacturing machinery are capable of materializing any fantasy they can pick up. I confess to looking forward to our return to this planet myself.

Captain's log, supplemental. We are out of communications with the ship. In addition, all our efforts so far to locate Lieutenant Uhura have been ... insufficient. This once friendly world, for reasons still known, has turned implacably hostile toward visitors. We would all like to know what has turned its former ambience to anger ... more than anger. But for the moment, our thoughts are concerned foremost with the well-being of our first communications officer.



Episode characters[]

AliceArex Na EthFrank GablerJames T. KirkShiboline M'RessMaster ComputerLeonard McCoyThe Playing CardsQueen of HeartsMontgomery ScottSpockHikaru SuluNyota UhuraWhite Rabbitunnamed USS Enterprise personnel (2260s) (helmsman)
Referenced only
Black KnightLewis CarrollAmanda GraysonKeeper

Novelization characters[]

AliceArex Na EthBobyninDeb ColottiDavis (lieutenant)Davis (engineer)DuchampsFrank GablerUb JacksonJames T. KirkLily LancerLingLongeyShiboline M'RessMaster ComputerLeonard McCoyHenry NduguThe Playing CardsQueen of HeartsMontgomery ScottSpockHikaru SuluNyota UhuraWhite Rabbitunnamed USS Enterprise personnel (2260s) (helmsman)
Referenced only
AraniusBierstadtJulius CaesarLewis CarrollSergei EisensteinFlaviusAmanda GraysonD.W. GriffithHachidaHansenKeeperStavos Keniclius 5John KyleBenjamin LeeEric MasefieldMcTavishN'gombiMaxfield ParrishSpock 2Erich von StroheimMark TwainVentrigorix

Starships and vehicles[]

Episode starships and vehicles[]

USS Enterprise (Constitution-class) • Shuttlecraft NCC-1701/3 (armored lander) • Shuttlecraft NCC-1701/4 (armored lander) • Shuttlecraft NCC-1701/9 (class F shuttlecraft) • unnamed USS Enterprise (NCC-1701) shuttlecraft

Novelization starships and vehicles[]

USS Enterprise (Constitution-class) • Galileo (NCC-1701/1) (class F shuttlecraft)
Referenced only
Cairounnamed USS Enterprise (NCC-1701) shuttlecraft


Episode locations[]

Omicron Delta region (Amusement Park Planet)

Novelization locations[]

Omicron region (Amusement Park Planet)
Referenced only
Arcadian systemEarth (Paducah, KentuckyRome) • Garden of EdenPhylosTsiolkovskyVulcan

Races and cultures[]

CaitianHuman (BelgianBritishGreekJapaneseRomanSwedish) • Edosian or TriexianVulcan

States and organizations[]

FederationRoman EmpireRoman Legion (Twelfth legionTwentieth legionTwenty-second legion) • Roman RepublicStarfleet

Science and technology[]

artificial gravityartificial gravity compensatorassignment patchcatapultchronometercommunicationscommunicatorcomputercorpelomineguidance computergunhand phaserintercomlancerobot hovercraftmedicinemedikitmelenexmicrotapephaser borerobotsensorStarfleet uniformStarfleet uniform (2265-2270)stasis chamberswordtransportertricordertwo-headed robot dragonuniformvaccineviewscreen

Units of measurement[]

centimeterdaykilometermeterminutesecondwarp speed (warp six)

Ranks and titles[]

agronomercaptaincenturionchiefchief engineerchief physiciandiplomatdoctorengineerFederation Starfleet ranks (2260s)first officerhead medical officerhelmsmanlieutenantofficerpatricianpilotpoetrankscience officersecond engineersenatorslaveStarfleet rankssubengineertransporter chiefwriteryeoman


Alice in WonderlandAlice Through the Looking-GlassDaisy BellMary Had a Little LambStarfleet Directives


antbirch treecarrotcatcypress treeelephantfishflowergrasshoneysucklehorseivymagnolia treeoak treeoriolepterodactylreptileretlaw plantSpanish mosstreewisteria

Other references[]

applebananabanjobarbarianbeamBoolean brandybotanybridgecaptain's logcaptain's log, USS Enterprise (NCC-1701), 2269cavechocolatechocolate cakechocolate raisin pieduty shifteight-ballengineeringfantasyfireforestfried chickengalaxygalleygranitegravestonegravityhaggishelmetIQironknightlanding partylogicmarshmallowmountainneuronorbitorepaintingpaleontologypaté de foie graspicnicpieplantplaying cardpoempool tablerainforestraisinrescue partyriversandwichshore leaveshore partyshuttle bayslaverystonetelepathytrack-and-fieldtransporter roomuniversevalleywaterzero gravity



USS Enterprise visited the Amusement Park Planet.
Between 2267 and 2269
Keeper died and was buried.
USS Enterprise returned for its second visit to the Amusement Park Planet.




Related stories[]





published order
Previous episode:
The Eye of the Beholder
TAS episode produced Next episode:
Previous episode:
The Magicks of Megas-Tu
TAS episode aired Next episode:
Mudd's Passion
Previous story:
first story
Log Three
Log Three
Next story:
Mudd's Passion
chronological order
Previous Adventure:
The Infinite Vulcan
Memory Beta Chronology Next Adventure:
Mudd's Passion
Previous Adventure:
The Infinite Vulcan
Pocket Next Adventure:
Mudd's Passion

German : Es war einmal auf einem Planeten, translated by Hermann Martlreiter. (Goldmann)
Romanian : A fost odată pe o planetă, translated by Max Felix. (Editura Cristian)

External links[]