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3183
Practical Joker, The
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On a routine mission surveying type-4 asteroids, the Enterprise is attacked by a trio of Romulan warships. The Romulans claim that the Federation ship has passed into their space. To avoid the conflict,...

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4187
Kzinti
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Also known as Kzin, the Kzinti are a race of sentient feline carnivores native to the planet Kzin. Kzinti are highly sexually dimorphic, at least in terms of intelligence; only the males are sentient,...

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Slaver Empire
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A galactic power that held sway over virtually all sentient life in the Milky Way Galaxy approximately one billion years ago, the Slaver Empire and its subject races were wiped out in a colossal interstellar...

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Slaver Weapon, The
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Aboard the Shuttlecraft Copernicus, Commander Spock and Lieutenants Sulu and Uhura are en route to Starbase 25, to which they are to deliver an exceedingly rare technological device: a stasis box constructed...

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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 soothing to many. They...

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4978
Mudd's Passion
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The Enterprise has come to the Arcadian star system to locate an "old friend," Harcourt "Harry" Fenton Mudd. Their mission is to corral Mudd for fraud, illegal drug manufacturing, and swindling. On the...

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Rigelian Hypnoid
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A six-legged creature with purple fur, a long tail, and yellow eyes and claws. About the size of a medium-size dog, the Rigelian hypnoid can project simple illusions, and speak. In 2269 (stardate 4978.5)...

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Rock Creature
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A giant monster seemingly made of brown stone, the "rock creature" is encountered on an uncharted planet by Captain Kirk, Mr. Spock, Nurse Chapel, and conman Harcourt Fenton Mudd in 2269 (stardate 4978.5)....

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Ursinoid
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A race of bipedal creatures, ursinoids have brown skins, and resemble a cross between an ape, and a bear, with a dog-like snout. Both male and female ursinoids work as heavy metal miners on the planet...

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5143
Survivor, The
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While patrolling near the Romulan Neutral Zone, the Enterprise discovers a small, badly damaged ship and beams aboard its lone survivor, who appears to be Carter Winston, a wealthy space trader known throughout...

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Vendorians
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A race of sentient shape-shifters native to the planet Vendor. In their natural form, Vendorians look rather like floating orange lamps adorned with six trailing tentacles. Because of their ability to...

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5267
Time Trap, The
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While exploring the Delta Triangle, a mysterious region of space where large numbers of starships have disappeared over the past couple of centuries, the Enterprise encounters a Klingon warship, the I.K.S....

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5275
Albatross
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As the Enterprise completes its mission to deliver medical supplies to Dramia, a surprising event occurs; the Dramians give Captain Kirk an arrest warrant for Dr. McCoy. According to them, 19 years prior,...

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Dramians
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Native to the remote planets of Dramia and Dramia II , the Dramians are tall creatures who have a vaguely humanoid appearance, with yellowish skin, bulbous fish-like heads with large craniums, and large...

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5329
Glommer
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A predator that feeds on tribbles, a glommer is larger than the average hand, and has a reddish four-legged body. Each leg has two joints, and the foot pads have four toes. The glommer also has two tiny...

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More Tribbles, More Troubles
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As it escorts two robot grain ships to Sherman's Planet, a world ravaged by crop failures and famine, the Enterprise breaks course to track a Klingon battle cruiser that is pursuing a one-man scout ship....

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5371
Cosmic Cloud
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A sentient, spaceborne entity that stretched across eight hundred thousand kilometers of space, with a width of about four hundred thousand kilometers. The creature's length measured roughly twice the...

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One of Our Planets is Missing
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Starfleet Command dispatches the Enterprise to investigate the presence of an eight-hundred thousand kilometer-wide cosmic cloud, a bizarre mixture of matter and energy that has suddenly appeared from...

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5373
Le-Matya
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This native animal to planet Vulcan is a large, mountain lion-like desert predator with a poisonous bite . It is capable of killing Vulcans and sehlats.

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Sehlat
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A large, bear-like animal native to Vulcan, sehlats typically possess six-inch fangs. Although sehlats can be ferocious in the wild, Vulcan families frequently domesticate them as pets. Spock had a pet...

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Yesteryear
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Following a voyage back in time to observe the history of the Orion civilization, a team consisting of Kirk, Spock, and an historian named Erikson return to the year 2269 from the enigmatic time portal...

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5483
Lorelei Signal, The
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While on a mission to investigate a region of space in which starships have been disappearing at the rate of one every 27.346 years, the Enterprise is probed by a signal from the Taurean system — a signal...

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5499
Ambergris Element, The
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At the planet Argo, a team from the Enterprise takes an aquashuttle to the surface. The planet is almost completely covered in water due to earthquakes and other seismic phenomena, and the Enterprise needs...

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Aquans
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The race of sentient humanoids living beneath the waters of the planet Argo are unknown to the Federation prior of 2269. When the crew of the U.S.S. Enterprise investigates the world, its officers interact...

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Sur-Snake
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A large scarlet colored sea beast on the planet Argo, the sur-snake has four long tentacles ending in flippers, a pair of yellow eyes, a dorsal fin, and fangs. When a Federation aquashuttle is attacked...

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5501
Eye of the Beholder, The
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Orbiting the planet Lactra VII, the Enterprise is on a mission to investigate the fate of the S.S. Ariel and its six-member scientific crew, which have disappeared. A message from the ship's captain, Lieutenant...

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Lactrans
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Giant creatures that resemble slugs, the orange Lactrans each have individual reddish markings on their backs and faces. They have two yellow eyes and a trunk which ends with three grasping tentacles....

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Maravel Dragons
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A flying, screeching creature indigenous to Maravel, and apparently resistant to phaser fire. When Captain Kirk and his landing party are on Lactra VII in 2269 (stardate: 5501.2), Kirk remarks that some...

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5521
Beyond the Farthest Star
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While the crew of the U.S.S. Enterprise is charting the space just beyond the edge of the galaxy, the starship becomes caught in the hypergravitational pull of the dead star known as Questar M-17. Narrowly...

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Edosian
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A tripodal, polytheistic race from the planet Edos. An Edosian has three legs, three arms, and three fingers on each hand and foot, with orange skin and a bony face. Lt. Arex is Edosian. Edosians are...

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Magnetic Organism
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An intelligent, noncorporeal life form consisting of coherent magnetic fields, sometimes manifesting itself visually as a luminous green cloud. A malevolent magnetic organism inhabited the dead alien pod...

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5554
Infinite Vulcan, The
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Near the edge of the galaxy, on the recently discovered planet Phylos, Captain Kirk leads a landing party in the exploration of a technologically advanced city that has been overrun with plant life — one...

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Phylosians
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Sentient plant people native to the planet Phylos, the Phylosians of the twenty-third century are heirs to a civilization that is long past its prime — a civilization they wish to see restored to its former...

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Swooper
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A large, ferocious, birdlike flying creature that is actually a motile plant, like much of the life on its native planet Phylos. Swoopers typically measure more than five meters in length, and make strafing...

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5577
Gossamer Mice
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Test animals used in the medical laboratories of the U.S.S. Enterprise in 2269. Because these small, rodent-like extraterrestrial creatures are nearly transparent and are extremely sensitive to changes...

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Halo Fish
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Alien fish that bear a resemblance to terrestrial angelfish, except for the bright halo of multicolored light they emit. Because halo fish lose their colorful illumination in response to any change in...

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Terratin Incident, The
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A mysterious signal consisting of only one intelligible word — "terratin" — draws the Enterprise and her crew to the lone planet of the Cepheus system. While the Enterprise is orbiting the planet, something...

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Terratins
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The descendants of the human settlers of the only planet orbiting the star Cepheus, the Terratins were shrunk to a few millimeters in height by the strange spiroid energy waves that suffuse the surface...

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5591
Once Upon a Planet
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The crew of the U.S.S. Enterprise is ready for some down time, and they head to the so-called "shore leave" amusement park planet in the Omicron Delta region. Dr. McCoy, along with Lieutenants Uhura and...

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Pterodactyls
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Flying reptiles which existed from Earth's Triassic period to the end of the Cretaceous period, pterodactyls are properly called "pterosaurs." In 2269 (stardate 5143.3), when the starship Enterprise returns...

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5683
Jihad, The
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The U.S.S. Enterprise has come to the Vedala asteroid on a unique mission, responding to a message from the Vedala that a threat to the universe is developing. Captain Kirk and Mr. Spock beam down to the...

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Skorr
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A race of avian creatures, the Skorr are a fierce and proud race who were once great warriors with advanced military technology and the ability to breed vast armies rapidly. According to Vulcan estimates,...

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Vedala
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According to Federation records, the Vedala are the oldest known spacefaring civilization. One representative of the Vedalan race is met in 2269 (stardate: 5683.1), by Captain Kirk and Mr. Spock. The female...

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6063
Capellan Power-Cat
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The fierce Capellan power-cat hails from the planet Capella IV. Untamable, it will discharge 2,000 volts of electricity if even touched by another creature. Only a hypo with tranquilizer at its highest...

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How Sharper Than a Serpent's Tooth
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In late 2270, the Enterprise is following a propulsion trail, hoping to learn the origins of an alien space probe which scanned Earth and sent signals out into space, then self-destructed. They encounter...

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6334
Pirates of Orion, The
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Her crew still recovering from a recent shipwide outbreak of choriocytosis, the Enterprise is en route to the dedication ceremonies for Deneb V's new Academy of Sciences. On the way, Commander Spock succumbs...

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6770
Counter-Clock Incident, The
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The Enterprise is ferrying Commodore Robert April, the first commander of the U.S.S. Enterprise NCC-1701, and his wife, Dr. Sarah April (the ship's first chief medical officer), to the planetoid Babel,...

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7403
Bem
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The Enterprise is conducting planetary surveys with Commander Ari bn Bem, an observer from Pandro, a neutral world with which Starfleet and the Federation hope to establish diplomat relations; Pandro's...

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Eggling
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Because Pandronians are hatched from eggs, Commander Ari bn Bem compared himself to an "eggling" — a newly hatched Pandronian youngster — to express how humbled he felt on stardate 7403.6 (2270) in the...

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Pandronians
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A light-green-skinned race of humanoid-appearing creatures native to the planet Pandro. Unlike virtually all other known humanoid species, however, Pandronians are actually "colony creatures" capable of...

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54890
Renaissance Man
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Captain Janeway and the Doctor run into a problem as they travel back from a medical symposium on the Delta Flyer. When Janeway returns to the U.S.S. Voyager, she tells Chakotay that they encountered a...

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Unknown
Klingons
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Planet: Q'onoS (Kronos, the Klingon homeworld). The well-statured warrior race has a genetic predisposition to hostility and a well-known streak of fatalism. Lieutenant Worf says that Klingons do not...

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