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1312
Where No Man Has Gone Before
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Some years before this second pilot, the S.S. Valiant had encountered a unknown energy barrier at the rim of the galaxy. Something had then made its captain destroy his ship. The U.S.S....

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1329
Mudd's Women
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The U.S.S. Enterprise pursues an unknown ship into an asteroid belt to save its crew before it's destroyed. The four people aboard are beamed on to the U.S.S. Enterprise; former nemesis Harry Mudd...

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1512
Corbomite Maneuver, The
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While exploring an uncharted region of space, the U.S.S. Enterprise comes upon an alien space buoy which is cube-shaped and spins, warning ships away and blocking the starship's path. Kirk's...

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1513
M-113 Creature
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Planet: M-113. The last of a vaguely humanoid species sometimes referred to as the "salt vampire" because of its need for salt and its willingness to kill to satiate its own hunger. The creature...

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Man Trap, The
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The U.S.S. Enterprise arrives at planet M-113 to deliver supplies to Dr. Robert Crater and his wife, Nancy, whom Doctor Leonard McCoy was once romantically involved with. M-113 is home to the...

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1533
Charlie X
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Charles Evans, the lone survivor of a crashed colonizing expedition to the planet Thasus, comes aboard the U.S.S. Enterprise from the S.S. Antares. But when the Antares' Captain Ramart contacts...

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Thasians
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Planet: Thasus. An advanced, intelligent, noncorporeal race of beings, first encountered on stardate 1533.6 when they made contact with Captain Kirk to retrieve a young humanoid they had given...

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1672
Enemy Within, The
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While orbiting the planet Alfa 177, the U.S.S. Enterprise experiences a transporter malfunction when Technician Fisher is beamed up from the planet with some magnetic ore on his clothing. Scotty...

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1704
Naked Time, The
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Spock and Joe Tormolen beam down to planet Psi 2000 to pick up a research party before the planet disintegrates. They find everyone has died, frozen when life support was turned off. Even...

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1709
Balance of Terror
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The marriage of Angela Martine and Robert Tomlinson is interrupted when a Romulan bird-of-prey attacks and destroys Outpost 4, which guards the Neutral Zone between Federation and Romulan space....

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Romulans
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Planets: Romulus and Remus (aka Romii). Until stardate 1709.2 when the U.S.S. Enterprise NCC-1701 under the command of Captain James T. Kirk had an unfriendly run-in with a Romulan ship. Very...

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2124
Squire of Gothos, The
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The U.S.S. Enterprise must cross an empty sector of space on their way to deliver supplies to colony Beta VI. In this space, they find an uncharted planet whose presence can't be explained. After...

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2254
Cage, The
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Thirteen years before James T. Kirk takes command of the U.S.S. Enterprise, Captain Christopher Pike and his starship crew receive a distress signal from the planet Talos IV and beam down to...

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Talosians
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Planet: Talos IV Humanoids dependent upon illusion; their civilization was nearly wiped out by war thousands of centuries ago. They are only now beginning to rebuild.

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2534
Ekosians
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Planet: Ekos. A humanoid race at war with a neighboring planet, Zeon. Ekosian society was based on World War II-era Nazi Germany on Earth due to a miscalculation by a Federation cultural observer...

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Patterns of Force
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The U.S.S. Enterprise is sent to planet Ekos to investigate the disappearance of an old Academy professor of Kirk's — historian John Gill. The Enterprise is attacked by an armed probe with a...

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2712
What Are Little Girls Made Of?
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The U.S.S. Enterprise arrives in orbit around Exo III, to search for exobiologist Dr. Roger Korby. When Kirk asks Spock if Korby could possibly still be alive, Spock glances at Christine, then...

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2713
Miri
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The U.S.S. Enterprise answers an old distress signal to find an unnamed planet that is almost an exact duplicate of Earth in the 1960s. A landing party beams down and discovers that 300 years...

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2715
Dagger of the Mind
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When Dr. Simon van Gelder of the psychiatric staff at the Tantalus Penal Colony escapes to the U.S.S. Enterprise exhibiting signs of manic insanity, an enraged McCoy insists that Kirk investigate...

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2817
Conscience of the King, The
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Twenty-two years before stardate 2817.6, the governor of Tarsus IV, Kodos, evoked emergency martial law and ordered half of the planet's population executed. His intent was to address a severe...

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2821
Galileo Seven, The
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On its way to deliver medical supplies to plague-ridden Makus III, the U.S.S. Enterprise passes Murasaki 312. Since they are under Starfleet orders to inspect galactic phenomena such as this...

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Regulan Blood Worm
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Origin: unspecified. This amorphous, pulpous creature rates such a low status to the Klingon people, that name is used to insult people who are thought to be weak. The Klingon, Korax uses this...

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2947
Court Martial
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When the U.S.S. Enterprise puts in at Starbase 11 for repairs caused in an ion storm, Kirk gives his report of the circumstances of Lieutenant Commander Ben Finney's death to Commodore Stone. All...

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3012
Menagerie, Part I, The
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The U.S.S. Enterprise and her crew are diverted by a signal from the former captain of the U.S.S. Enterprise on Starbase 11, and proceed to the call. When they arrive they find Captain Christopher...

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3013
Menagerie, Part II, The
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The U.S.S. Enterprise and her crew are diverted by a signal from the former captain of the U.S.S. Enterprise on Starbase 11, and proceed to the call. When they arrive they find Captain Christopher...

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3018
Catspaw
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On the planet Pyris VII, two beings known as Korob and Sylvia have been sent on a mission of conquest by their home world. Using a matter transmuter, they assume human form to welcome the U.S.S....

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Ornithoids, Extragalatic
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Origin: extragalactic. Slight beings only inches tall, alien to human-type emotions but capable of matter manipulation with a replication/transporter technology dubbed "transmuter" which is used...

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3025
Shore Leave
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A U.S.S. Enterprise landing party beams down to an uncharted planet. The planet seems like a perfect candidate for shore leave with its "Earth-type" characteristics. Kirk sends McCoy down with the...

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3045
Arena
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The U.S.S. Enterprise is in pursuit of an unknown alien ship which has destroyed a Starfleet base on Cestus III. In an uncharted area of space, both the alien ship and the Enterprise are caught by...

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Gorn
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Origin: unknown. An intelligent, bipedal reptilian species who fought with Captain Kirk on stardate 3045.6 under the assumption that the Federation was threatening the Gorn claim to the planet...

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Metron
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Planet: Cestus III An extremely advanced humanoid species who intervene in Captain Kirk's battle with the Gorn on stardate 3045.6. Being surprised at the mercy Kirk shows to the Gorn, the Metron...

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3087
Alternative Factor, The
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While orbiting what should be a dead planet, the U.S.S. Enterprise experiences a moment of "nonexistence." Starfleet Command fears an enemy invasion and orders Kirk to find out what caused the...

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3113
Tomorrow Is Yesterday
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When the U.S.S. Enterprise is thrown into a time warp by a black star, it ends up orbiting Earth in the 20th century. Omaha Air Base detects a peculiar UFO and sends a fighter plane, manned by...

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3134
City on the Edge of Forever, The
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McCoy accidentally injects himself with an overdose of cordrazine, a drug which makes him exhibit signs of paranoia and madness, while treating an ailing Sulu on the Bridge. Delirious, he beams...

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3141
Space Seed
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A piece of one of history's great puzzles falls into place when Kirk's crew comes across the S.S. Botany Bay, an old-style, pre-warp sleeper ship from Earth that contains several bodies in stasis....

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3156
Return of the Archons, The
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The U.S.S. Enterprise is investigating Beta III, where the U.S.S. Archon disappeared over 100 years before. When the landing party exhibits strange behavior, Kirk sends another party down to...

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3192
Taste of Armageddon, A
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The U.S.S. Enterprise is ordered to pick up Ambassador Robert Fox, who is headed to planet Eminiar VII on a diplomatic mission. Upon arriving at the planet, the ship is warned away. Beaming to...

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3196
Devil in the Dark, The
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The U.S.S. Enterprise arrives to investigate reports of an unknown monster deep in the mining tunnels of Janus VI. The being is apparently destroying machinery and killing the miners, and has the...

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Horta
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The Horta is a highly intelligent, silicon-based species, that is capable of tunneling through solid rock ike humans are able to walk through air. Discovered on the planet Janus IV, the Horta is...

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3198
Errand of Mercy
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Kirk and Spock beam down to the surface of planet Organia to negotiate for the erection of a Federation base on that planet. Hostilities between the nearby Klingon Empire and Federation have...

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Organians
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Planet: Organia. On first appearance, a simple agrarian humanoid race that had no significant advancements for over 10,000 years. On stardate 3198.4, the true nature of the Organians revealed an...

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3211
Gamesters of Triskelion, The
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During a routine transport to a planet, Captain Kirk, Lieutenant Uhura and Ensign Chekov are intercepted and abducted by a powerful and distant transporter beam. Arriving, literally, flat on their...

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Providers
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Planet: Triskelion. Members of a species who apparently were humanoid in appearance, but eventually evolved into disembodied brains due to their devotion to intellectual abilities. Three such...

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3219
Companion, The
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An intelligent entity composed of noncorporeal energy in the forum of a sparkling cloud. It is apparently female gendered, and very inviting when ex-Federation scientist Zefram Cochrane (inventor...

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Metamorphosis
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Assistant Federation Commissioner Nancy Hedford has become ill while trying to stop a war on Epsilon Canaris III. The shuttlecraft Galileo is assigned to take her to the U.S.S. Enterprise, where...

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3287
Operation: Annihilate!
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Arriving at the planet Deneva, home of Kirk's only brother Sam and his family, the U.S.S. Enterprise picks up a transmission from a Denevan pilot who has steered his craft into the sun to destroy...

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3372
Amok Time
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When Spock begins to exhibit strange, erratic behavior, Kirk asks McCoy to conduct a medical examination. McCoy concludes that Spock is experiencing a potentially lethal internal distress. Spock...

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3417
This Side of Paradise
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Expecting the colonists of Omicron Ceti III to be dead after three years of exposure to deadly Berthold rays, Kirk and Spock are surprised to find the colony alive and flourishing. Spock beams to...

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3451
Changeling, The
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The U.S.S. Enterprise is sent to investigate the destruction of the Malurian system and its four billion inhabitants. When it arrives at the coordinates, the starship itself is threatened by a...

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3468
Who Mourns for Adonais?
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As the U.S.S. Enterprise nears the planet Pollux IV, a huge, green hand made of energy materializes in space, catching the U.S.S. Enterprise and holding it captive. Kirk and a landing party are...

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3478
Deadly Years, The
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On the way to Starbase 10, the U.S.S. Enterprise stops to deliver supplies to the colonists of Gamma Hydra IV. A landing party consisting of Kirk, Spock, McCoy, Scott, Lieutenant Galway and Chekov...

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3497
Capellans
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Planet: Capella IV. A moderately primitive humanoid society based on tribal leadership and strong codes of war. Led by a high male tier, their customs and traditions forbid shows of cowardice, and...

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Friday's Child
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Sent to the planet Capella IV to negotiate a mining treaty, Kirk and a party beam to the surface. They find the Capellans to be warlike and tradition-bound people. Kirk also finds that a Klingon...

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3614
Argelians
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Planet: Argelius II. Despite the hedonistic nature of the natives of Argelius II, their planet has long been known as a friendly shore-leave spot for Starfleet — even after the murderous...

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Wolf in the Fold
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Kirk and McCoy decide to take Scotty, who is recovering from a head wound accidentally caused by a female crew member, to a nightclub on the planet Argelius II. Scotty becomes infatuated with a...

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3619
Obsession
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Eleven years ago, the U.S.S. Farragut encountered a deadly cloud creature with vampire-like tendencies. James T. Kirk was on board the Farragut at that time as they entered the region of Tycho IV....

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3689
Halkans
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Planet: name unspecified. Both in the mirror universe and in our universe, the Halkans are a humanoid species renowned for their commitment to absolute peace.

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Mirror, Mirror
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Caught in the beginnings of an ion storm, Kirk, McCoy and Uhura interrupt their negotiations with the Halkans for dilithium crystals, to return to the U.S.S. Enterprise. Scotty beams the landing...

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3715
Apple, The
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When a landing party beams down to the planet Gamma Trianguli VI, they find what appears to be an idyllic paradise. They quickly discover, however, that the planet is deadly, sporting plants that...

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3842
Andorians
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Planet: Andoria. Humanoid Federation members are blue-skinned in appearance, with bilateral antennae that reflect their emotional state, and characteristically white hair. Andorians are...

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Journey to Babel
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The U.S.S. Enterprise is appointed to transport ambassadors from many worlds to the Babel Conferences. Among those aboard are Ambassador Sarek of Vulcan and his human wife, Amanda — Spock's...

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Orions
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Green-skinned humanoids, the most notable of whom are the so-called "green Orion animal women," females who seem to be mere slaves but actually wield a preternatural influence over humanoid males...

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Tellarites
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Planet: Tellar. A humanoid species distinguished by a porcine-like snout, stout build, deep set eyes and a characteristically irascible disposition. The long-time United Federation of Planets...

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4040
Bread and Circuses
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The U.S.S. Enterprise finds the wreckage of the S.S. Beagle, with no survivors, orbiting near the Planet 892-IV. When Kirk, Spock, and McCoy beam to the planet's surface, they find a disheveled...

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4202
Doomsday Machine, The
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Sent to investigate the destruction of several planetary systems, the U.S.S. Enterprise discovers a crippled starship, the U.S.S. Constellation, floating in space. Commodore Matthew Decker is the...

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4211
Mugato
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Planet: Tyree's planet An indigenous simian-like beast, carnivorous, with characteristically white fur, a rhino-like horn on the top of its head, and sharp and extremely venomous fangs.

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Private Little War, A
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Captain Kirk leads a survey mission to a peaceful, primitive planet which he visited 13 years before as a lieutenant. He is dismayed to see a group of villagers armed with flintlocks, weapons they...

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4307
Amoeba
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Origin: space. A giant single-celled creature which resembles an Earth amoeba but is magnified millions of times. This space-roaming entity threatened to consume all life in the galaxy until it...

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Immunity Syndrome
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The U.S.S. Enterprise is en route to Starbase 6 for shore leave when Uhura receives a jumbled message from which all she can make out is a sector coordinate and the name U.S.S. Intrepid, a...

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4372
Elaan of Troyius
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Two United Federation of Planets members, Elas and Troyius, suffered war for centuries. With Klingon Empire expansion approaching the planets' system, Tellun, the Federation sends the U.S.S....

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Elasians
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Planet: Elas. A fierce humanoid warrior culture at war for years with the neighboring planet of Troyius until both cultures achieved the technology necessary to wipe both themselves and their...

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4385
Megans
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Each person on Megas-Tu is a specialist in a specific kind of magic, and while the satyr-like Lucien says there are no rivals, "generalists" such as himself are branded as troublemakers. The...

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Melkotians
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Origin: Melkotian space. (Also referred to as Melkots, stardate 4385.3), a telepathic species, non-humanoid, which appears as a disembodied head and neck whose eyes are literally two shining...

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Spectre of the Gun
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Kirk ignores an alien buoy that warns the U.S.S. Enterprise that it is trespassing into Melkotian space and continues forward when the Melkots transport Kirk, Spock, McCoy, Scotty, and Chekov to a...

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4513
I, Mudd
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Norman, an android pretending to be a member of the U.S.S. Enterprise crew, takes control of the starship and her crew, taking them to an unnamed planet where Kirk discovers an old nemesis ......

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4523
Tribble
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Origin: unspecified. A small animal characteristically soft, furry, and pleasing to most humanoids (with the exception of Klingons). Tribbles give off a soft purring sound that is...

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Trouble With Tribbles, The
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When the U.S.S. Enterprise receives a top-priority order to protect a shipment of quadrotriticale grain on Deep Space Station K-7, Kirk is irritated to be guarding a shipment of "wheat." But the...

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4598
Iotians
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Planet: Sigma Iotia II Highly intelligent and imitative humanoid species who model their social practices after a single Federation book that was left in the Iotian's possession before...

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Piece of the Action, A
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The planet Sigma Iotia II's last visit by the Federation was by the U.S.S. Horizon ... a hundred years before. Realizing the lapse in monitoring the planet, the Federation sends the U.S.S....

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4657
By Any Other Name
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When the U.S.S. Enterprise answers a distress call from a small planet, the landing party is captured by a group of agents from the Kelvan empire, located in the distant Andromeda galaxy. The...

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Kelvans
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Planet: Kelva. Humanoid in appearance, the Kelvans' true appearance remains a mystery and remains unexplained. As refugees of a galaxy poisoned by heavy radiation, the Kelvans have assumed...

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4729
Ultimate Computer, The
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The U.S.S. Enterprise is chosen to be the test ship for the new M-5 multitronic computer system, a computer meant to be able to run a starship without human intervention. Also aboard for the test...

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4739
Assignment: Earth
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Sent back in time to find out how Earth managed to survive without destroying itself, the U.S.S. Enterprise inadvertently beams aboard a space traveler, Gary Seven, along with his black cat, Isis....

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4768
Return to Tomorrow
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The U.S.S. Enterprise tracks a mysterious SOS to an ancient planet presumed long dead. The crew hears a voice from a telepathic being named Sargon, who asks Kirk to beam down to the surface. When...

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4842
Paradise Syndrome, The
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Investigating a planet in danger of collision with an asteroid, Captain Kirk, Mr. Spock, and Dr. McCoy discover both Native American inhabitants and a strange alien obelisk. While examining the...

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4985
Omega Glory, The
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The U.S.S. Enterprise finds a crewless starship, the U.S.S. Exeter, in orbit around the planet Omega IV. The boarding party from the U.S.S. Enterprise contracts a virus that may have killed the...

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5027
Enterprise Incident, The
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Seeming tense and erratic, Captain Kirk takes the U.S.S. Enterprise into Romulan space and the ship is immediately surrounded by Romulan warships. Kirk and Spock beam aboard the Romulan flag-ship...

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5029
And the Children Shall Lead
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When the U.S.S. Enterprise finds that all the adults in the Starnes Expedition to Triacus have killed themselves, they beam to the planet's surface to investigate. The children, however, are alive...

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5121
Empath, The
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The U.S.S. Enterprise goes to pick up research personnel on the second planet of the star Minara. While Kirk, Spock and McCoy are on the surface, a radiation storm endangers the starship and...

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Vians
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Origin: unspecified. A technologically advanced humanoid race with enlarged cranial cavities, capable of injuring their subjects by magnifying the power of their own thoughts. On stardate 5121.5,...

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5423
Mark of Gideon, The
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The planet Gideon appears to be a haven — the inhabitants are healthy and no one seems to ever die in the totally germ-free environment. The United Federation of Planets sends the U.S.S....

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5431
Spock's Brain
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The U.S.S. Enterprise is on a routine mission in deep space when a beautiful young woman beams onto the bridge. Without a word, she touches a band on her wrist and everyone is rendered...

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5476
Fabrini
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Planet/Asteroid: Yonada. The Fabrini are an ancient humanoid race whose ancestors built a traveling "world" called Yonada to save their descendants before their sun went supernova.

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For the World Is Hollow and I Have Touched the Sky
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At the same time McCoy discovers that he has a year to live, the U.S.S. Enterprise encounters the asteroid Yonada which is determined to be artificially propelled. Its center is occupied by...

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5523
Day of the Dove
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A U.S.S. Enterprise landing party beams to a human-colonized planet in answer to a distress call. A Klingon ship, apparently damaged, is detected and a group of Klingons accuse Kirk of having...

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5630
Is There In Truth No Beauty?
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In an attempt to adapt Medusan technology to Federation use, and vice versa, the U.S.S. Enterprise picks up Medusan ambassador Kollos, instrument specialist Laurence Marvick and telepath Dr....

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Medusans
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Planet: Unspecified. A species of highly intelligent noncorporeal beings whose sensory systems differ radically from humanoid sensory systems.  This makes the Medusans particularly well...

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5683
That Which Survives
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As a landing party prepares to beam down to a previously unexplored Class-M planet, a beautiful woman, Losira, appears. She touches an ensign and kills him. Already dematerializing in the...

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5693
Tholian Web, The
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The U.S.S. Enterprise arrives in an uncharted area of space to answer a distress call from the U.S.S. Defiant. The starship is visible on their viewscreen, but sensors on board the U.S.S....

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5710
Scalosians
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Planet: Scalos. Humanoids who exist in a hyper-accelerated state due to overexposure to radiation.

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