Star Trek

Turnabout Intruder

The Enterprise is answering a medical...
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The Enterprise is answering a medical emergency of an archaeological expedition. Kirk is confronted with the deep hatred of an old love, Janice Lester, who is severely ill from celebium radiation. As payment for jilting her, Dr Lester arranges for an alien machine to swap the consciousness of Kirk and herself in order for her to take command of the Enterprise. On board the Enterprise, Kirk (in Lester's body) tries to convince Spock that he is trapped in Janice's body. As a result, Janice (in Kirk's body) conducts a court-marshal with the intent of executing Spock, McCoy, Scotty, and Kirk (in Janice's body) to keep her secret. The crew realizing something is wrong with their captain does not cooperate.
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All Our Yesterdays

When the planet Sarpeidon is about to...
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When the planet Sarpeidon is about to be destroyed by its star Beta Niobe becoming a supernova, Kirk, Spock and McCoy beam down and find it evacuated except for Atoz, its librarian, tending with his replicas a collection of unusual discs, which play the planet's history and (to their surprise) allow their users to travel into the past trough the atavachron, a time machine, into the periods each was studying on disc, but they jump in unprepared. McCoy and Spock find themselves locked in a planetary ice age 5,000 years ago, where Spock reverts to the barbaric age of the Vulcans, hence touchy and intensely attracted to the political exilee Zarabeth, who enjoys getting company but tells them return is impossible. Kirk lands in a Cromwellian period, where he's arrested and suspected of witchcraft, but realizes the magistrate must be a time traveler like him, and learns not being prepared at molecular level he can return trough the time portal, and in fact must do so and contact Spock and Bones in a matter of hours; they must all return to the present and board the Enterprise before the exploding sun destroys the atavachron...
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The Savage Curtain

The Enterprise's sensor readings...
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The Enterprise's sensor readings indicate a planet unsuitable for any carbon-based life at the level of a developed civilization. Suddenly they get an apparition in space from someone who looks like and claims to be Abraham Lincoln, insists on them checking him over in a small part on the planet surface (which has a perfect atmosphere for humans) and is received with full presidential honors. Kirk and Spock agree to beam down with him, but phasers fail to dematerialize and communicators don't work. There they meet Surak, the greatest Vulcan of all time, equally convincing. The quartet is greeted by a creature consisting of molten rock, to be presented to notorious historical villains Ghengis Khan, Colonel Green, Zora and the Klingon Kahless the Unforgettable and told the teams representing good viz. evil must do battle to the death against each-other to help the creature decide about the concepts. When they refuse to continue after beating off a first traitorous attack, the creature ups the stake by causing a power disaster which will blow up the Enterprise in four hours unless they win.
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The Cloud Minders

In order to save an inhabited planet...
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In order to save an inhabited planet from being destroyed by a botanical plague, the Enterprise goes to pick up zenite, the mineral cure, on the only known planet where it is mined. When Kirk and Spock beam down, they are attacked by 'troglites' (troglodyte miners) but not captured. High council adviser Plasus intervenes and brings them to Stratos, the luxurious metropolis, which literally floats in the sky. However it is under attack from 'disruptors', troglite revolutionaries who want equal life conditions for their peers. They do all the hard work, mainly toiling miserably in mines and dwell in caves on the barren surface below. Dr. McCoy finds out the alleged intellectual inferiority of the troglites is not genetic but the reversible effect of exposure to the invisible gas emitted by the zenite.
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The Way to Eden

The Enterprise is ordered to pursue a...
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The Enterprise is ordered to pursue a group of anti-establishment idealists who have stolen a space cruiser and made off for the mythical planet Eden. When the group pushes their stolen ship beyond its limits, the Enterprise is forced to rescue them by transporting them aboard. This merry band of space-hippies includes the insane leader (Dr. Sevrin), an academy drop-out and former love interest of Chekov (Irina), and the son of a Catullan ambassador (Tongo Rad). With the Federation undergoing fragile treaty negotiations with the Catullans, Kirk is ordered by Starfleet to treat the dissidents with "extreme tolerance." Kirk finds the group and its leader too difficult to deal with while Spock maintains a deep curiosity about their ideals. Kirk appoints Spock as liaison for the group during their stay on the Enterprise. Dr. Sevrin demands to be taken to Eden, but Kirk refuses on the grounds that his orders from Starfleet dictate that the group be taken to the nearest star base. While investigating this strange group of free spirits, Dr. McCoy and Mr. Spock discover that not only is Dr. Sevrin insane, he is also the carrier for a potentially lethal disease. His desire to abandon technology and join the "primitive" inhabitants of planet Eden could well result in their destruction. As a precaution, Dr. Sevrin is quarantined, but Spock agrees to plot a course to the mythical planet of Eden in exchange for his cooperation. Meanwhile, Chekov inadvertently gives away some vital information about auxiliary control to his former classmate, Irina, and she and the rest of Sevrin's followers soon free him and commandeer the Enterprise. The group takes the Enterprise to Eden (which, to complicate matters, happens to be in Romulan space), establish orbit and steal a shuttle craft to land on the surface while the Enterprise crew is incapacitated. But the planet, while as beautiful as any of them imagined, also has a deadly side.
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Requiem for Methuselah

When Kirk, Spock and McCoy beam down...
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When Kirk, Spock and McCoy beam down to a supposed uninhabited planet to gather the mineral ryetalyn to fight a plague of Rigelian fever on-board the Enterprise, they find a fellow earth-man called Flint and his extremely intelligent female ward Rayna who Kirk begins to fall in love with. Flint then proceeds to trap them on his planet and takeover the Enterprise.
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The Lights of Zetar

The Enterprise is on course to...
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The Enterprise is on course to install new equipment on Memory Alpha, the central library storage facility for the Federation. Chief Engineer Scott has been working closely on the project with Lieutenant Mira Romaine with whom he has been forming a romantic attachment. The Enterprise encounters a space storm that kills the staff at Memory Alpha and possesses Lieutenant Mira Romaine.
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That Which Survives

As they are beaming down to a...
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As they are beaming down to a geologically unique planet below, an attractive woman suddenly appears in the transporter room. They're not quite sure who or what she is and the landing party - Kirk, McCoy, Sulu and geologist D'Amato - find themselves unable to contact the Enterprise. The woman soon re-appears killing D'Amato with her touch. The reason they can't reach the Enterprise is that the ship has been flung nearly a thousand light years across the galaxy. They also face the possibility that a malfunction in the engines may blow them up.
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The Mark of Gideon

While beaming down to the planet...
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While beaming down to the planet Gideon, Captain Kirk suddenly finds himself back in the transporter room. He can find no one on the ship, now apparently abandoned by the entire crew. He does find one other occupant of the Enterprise a beautiful young woman, Odona, who also does not know how she got there. Back on the real Enterprise, Spock tries to deal with Gideon's representatives who claim that Kirk never arrived and claim no knowledge of his whereabouts. Soon, Odona falls deathly ill which is exactly what the leaders of Gideon were hoping for. Spock soon realizes that there is problem with the beam down coordinates they were provided.
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Let That Be Your Last Battlefield

While on patrol, the Enterprise comes...
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While on patrol, the Enterprise comes across a shuttle craft stolen from Starbase 4. Its occupant is Lokai, a humanoid who is exactly half black and half white. Soon his pursuer, Commissioner Bele arrives on board demanding that Lokai be turned over to him for transport to their home planet where Lokai has been convicted as a terrorist. Both men have extraordinary powers and it turns out that the pursuit has lasted 50,000 years. Their hatred of one another is racially based and despite attempts by Kirk and others, they are not prepared to reconcile. The pursuit ends on their home planet where they learn the fate of their races.
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Whom Gods Destroy

The Enterprise travels to the planet...
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The Enterprise travels to the planet Elba II, home of the last asylum for the criminally insane, to deliver a serum that should cure all of the remaining inmates. Kirk and Spock beam down to the planet's surface and all seems to be in order but they soon realize that the inmates are now running the asylum. They are led by Garth, at one time a starship Captain whose exploits were required reading at the Academy. Garth and his fellow inmates have developed the capability to shapeshift and take on the appearance of anyone, including Kirk or Spock. Garth plans to pose as the Captain, beam up to the Enterprise and take over the ship but Kirk has other ideas.
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Elaan of Troyius

The Enterprise transports Elaan, the...
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The Enterprise transports Elaan, the female ruler of the warrior Troyians, to the planet of her enemy so that her arranged marriage will halt their interplanetary war. Kirk must teach the arrogant, vicious ruler the ways of polite society but falls victim to the legendary weapon of Troyian women: their tears act as a love potion. Spock tracks what may be another ship shadowing the Enterprise and Kirk, distracted by Elaan, must fight against other parties interested in preventing the Federation's peace efforts.
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The Empath

Kirk, Spock and McCoy suddenly find...
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Kirk, Spock and McCoy suddenly find themselves in an underground laboratory where they meet an attractive young woman who is not only mute but also an empath who can absorb someone else's pain. When their captors make themselves known, they refuse to explain why the three men have been taken prisoner or why they and the young woman, who McCoy has named Gem, are there. Inexplicably, they set about torturing them for no apparent reason. Fortunately, Gem's empathic powers allow her to take away their pain, but only at great sacrifice to herself. When their captors tell Kirk that he must choose which of his men to die, their selflessness comes to the fore, leaving Dr, McCoy volunteering himself. They all soon learn that the object of the experiment is Gem herself.
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Wink of an Eye

The Enterprise responds to a distress...
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The Enterprise responds to a distress call from the planet Scalos but when Kirk and a landing party beam down to the planet, they find no living beings. It turns out that Scalosian live at a much higher rate of acceleration rendering them invisible to the human eye. One of the Scalosians, the beautiful and seductive Deela, accelerates Kirk so they can interact and tells him he cannot return to his normal life. For the crew, Kirk has virtually disappeared before their eyes. The Scalosians want to turn the Enterprise into a cryogenic storage facility for the crew. Kirk learns that at his current state of acceleration, they are subject to cellular degeneration and rapid aging should they suffer the slightest cut. He leaves a message for the crew but it is left to Mr. Spock to find a way to decipher it.
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Plato's Stepchildren

On an urgent medical emergency Kirk,...
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On an urgent medical emergency Kirk, Spock and McCoy encounter an alien society who had once flourished on earth during the time of Plato. Since reaching their current planet they had developed psychokinetic powers while also losing the ability for their bodies to combat even the simplest infections. When Doctor McCoy refuses their offer to stay, they begin make sport with Kirk, McCoy, Nurse Chapel and Lieutenant Uhura using their psychokinetic powers.
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The Tholian Web

Kirk and the derelict starship...
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Kirk and the derelict starship Defiant vanish into a spatial interphase between universes. To rescue him, Spock must maintain position despite a growing, violent hysteria aboard the Enterprise like that which destroyed the Defiant's crew, as well as a force field being laid around the Enterprise by Tholian patrol ships.
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For the World Is Hollow and I Have Touched the Sky

The Enterprise in attacked by a...
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The Enterprise in attacked by a missile, launched from an asteroid on an independence collision course with highly populated planet Darren 5 in 396 days, which has simple atomic power and an internal atmosphere, but no inhabitants. McCoy has found he's the only unhealthy crew member: only one year life left. Kirk, Spock and McCoy beam down to the asteroid surface but are suddenly overpowered by sword-bearing men, commanded by high-priestess Natira who makes them kneel before a worshiped oracle, which smites them down electrically. They are given a medicine by an old servant who suffers pain twitches while telling he once saw the forbidden world outside and dies. The earthly visitors are now offered hospitality. The high-priestess asks McCoy to stay as her mate and explains the people is on its way to a new, green world, 'soon' according to the oracle. Kirk and Spock discover the oracle was build by the alien Fabrini civilization, this people is oblivious they are on a space-ship which will collide. They overhear the oracle tell Natira her mate must accept the instrument of obedience, then it smites the duo and orders their execution; McCoy convinces Natira to spare their lives if he stays as her spouse; Kirk and Spock beam up. McCoy gets in instants the painless brain-implant, a wedding, kisses and the promise the people will at arrival read the book of revelation written by the Creator. Starfleet orders the Enterpise to leave; when McCoy contacts them about the book, the instrument smites him in pain: Kirk and Spock beam back down...
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Day of the Dove

Having found a Federation colony of...
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Having found a Federation colony of 100 people completely destroyed, Kirk and the Enterprise have to deal with a nearby Klingon vessel which they believe must be responsible for the colony's destruction. There is obvious tension between the Enterprise crew and its Klingon enemies. When the Klingon ship is disabled, they too assume they were attacked by the Enterprise. Unbeknown to Kirk and his Klingon counterpart, Kang, this is the work of an alien being that gets its energy from the friction and emotions between sentient beings. The natural animosities between the two parties feed its appetites. When the creature is beamed aboard the Enterprise, it purposely creates tension among the crew, to its benefit. The situation eventually forces Kirk and Kang to work together to defeat it.
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Spectre of the Gun

When the Enterprise trespasses into...
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When the Enterprise trespasses into uncharted territory, Kirk, Spock, McCoy, Scotty and Chekov are transported to a planet that has all of the trappings of the Old West. It's 1881 and Kirk soon realizes exactly where they are: in Tombstone, Arizona on the day of the famed gunfight at the OK Corral between the Clanton gang and the Earps. The only problem is that Kirk and company represent the Clantons and if history is to be repeated, they will all be killed. They use whatever resources are available to them to defeat the enemy but the solution, and the only way of escape, lies within them.
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Is There in Truth No Beauty?

The Enterprise transports the Medusan...
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The Enterprise transports the Medusan Ambassador Kollos; his telepathic interpreter, Dr Miranda Jones; and Engineer Laurence Marvick. Only Vulcans and those trained in Vulcan self-control can handle the horrible sight of a Medusan (and then only with eye protection). Attempting to kill Kollos, Marvick (jealous of Miranda's interest in Kollos) goes insane at the sight of the Mudasan ambassador. Before dying Marvick, one of the designers of the Enterprise, takes the ship outside the galaxy where it is hopelessly lost. Once it is discovered that Miranda is blind (she had fooled them with a complicated neural sensor in her dress) and cannot guide the Enterprise, Spock mind-melds with the navigationally proficient ambassador who quickly gets the Enterprise back in known galactic space. However, while severing the mind-meld, he forgets the visor, sees Kollos, and goes insane. Because of her jealousy of Spock's relationship with Kollos, Miranda hesitates to give help, but with Kirk's urging reconsiders and helps Spock take control of his mind.
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And the Children Shall Lead

The Enterprise responds to a distress...
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The Enterprise responds to a distress call from the scientific colony on Triacus and arrives to find that all of the adults are dead. Oddly, the children seem unaffected by the deaths and continue to play as if nothing had happened. When questioned, they show no remorse whatsoever and express a dislike for parental authority. Expedition logs reveal that the expedition had discovered an ancient civilization and that there might be one survivor. In fact, the Gorgon thrives on the innocence of the children and the adults self-doubt.
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The Paradise Syndrome

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The Enterprise Incident

The Enterprise deliberately crosses...
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The Enterprise deliberately crosses the Neutral Zone, on Kirk's orders, into Romulan space and is promptly surrounded by Romulan warships, each equipped with a "cloaking device" that renders it undetectable. Spock betrays the apparently irrational and paranoid Kirk to the Romulan commander, a woman who is obviously attracted to Spock. A deadly game between Kirk, Spock and the Romulans risks not only the Enterprise but the tenuous cease-fire between the Romulans and the Federation.
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Assignment: Earth

When the Enterprise is assigned to...
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When the Enterprise is assigned to observe earths history in 1968, suddenly it intercepts a transporter beam which originates at least a thousand light-years from Earth, bringing aboard a humanoid alien 'agent Gary Seven' holding a black cat called Isis, who warns them to step back and let him go to accomplish his mission to save earth; initially phaser-struck down, he manages to beam himself away, actually on a mission to prevent a nuclear rocket being launched at McKinley base because earth is socio-politically not ready for its technological progress. He assumes a classified identity to override a powerful computer, and hits the wrong girl, Miss Lincoln, he mistook for another agent; the computer reports both other agents he seeks are deceased in an accident. Meanwhile Kirk and Spock beam down to investigate if the alien isn't hostile, realizing the risk of changing their own past. When they get on his trail, the girl sees Spock's ears, calls the police and Seven gets away; they must first beam back aboard, then down to the base looking for Seven who overpowers security and sabotages the missile; however they get caught before Scotty locates Seven and beams him up, but he beams himself back grumbling he wasn't finished...
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Bread and Circuses

While searching for the crew of a...
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While searching for the crew of a destroyed spaceship, the Enterprise discovers a planet whose oppressive government is a 20th-century version of Earth's Roman empire. Kirk, Spock, and McCoy meet the rebels, seemingly sun worshipers, but are quickly kidnapped by the regime. The missing Captain Merrick is revealed as the "First Citizen" and pawn of the regime, but he and the rebels ultimately help Kirk and company to escape. Back on the Enterprise, Uhura observes that the crew's understanding that the rebels are sun worshipers was not completely accurate.
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The Ultimate Computer

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The Omega Glory

As the Enterprise approaches the...
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As the Enterprise approaches the planet Omega IV, they find another starship, the USS Exeter in orbit. Kirk, Spock and McCoy beam aboard the Exeter to find that the ship has been abandoned. They also find the last log entry from the ship's surgeon telling them that they have been infected with a deadly virus brought aboard from a returning landing party. They beam down to the planet's surface to find there is one Exeter survivor: its Captain, Ron Tracy. He has apparently ignored the Prime Directive and has taken sides in a local dispute supporting the Kohms against their arch-rivals, the Yangs. As McCoy tries to find a cure for the virus, Spock and Kirk try to make sense of the situation. They soon realize there is an odd parallel with Earth's own history.
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By Any Other Name

Kirk, Spock, McCoy and a couple of...
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Kirk, Spock, McCoy and a couple of red shirts beam down to the surface of a planet in answer to a fake distress call. There they are overpowered by a small group of human-looking aliens from the Andromeda galaxy, led by Rojan. Their galaxy will be uninhabitable within a few thousand years, so they intend to conquer ours, to give themselves a new home. The aliens' spacecraft has been damaged by the energy barrier around the galaxy, and need the Enterprise to return home, enhancing its engines so that the journey will "only" take 300 years. They take over the Enterprise using their two main weapons - a paralyzing beam, and a ray that can reduce a person to a grey block of material - revival only being possible if the block is not damaged. After successfully negotiating the energy barrier, the aliens reduce all the crew into the grey blocks, with the exception of Kirk, Spock, McCoy and Scott, who must somehow overcome the aliens, revive the crew and return home.
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Patterns of Force

The Enterprise tracks the missing...
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The Enterprise tracks the missing Federation's cultural observer, professor John Gill, to the reportedly primitive and peaceful planet of Acos. When Kirk and Spock beam down, they find the Acosians have turned into a Nazi society and are at war with the Zeon people, with Gill as its F?hrer. They steal uniforms to enter the headquarters but when Spock is forced to remove his helmet his ears betray them and they are led straight to the torture chamber. After a flogging as 'Zeon spies' they manage to escape with the Zeon prisoner Eneg who takes them to the Zeon resistance. The resistance tests them, and plots with an Acosian defector to get to Gill, posing as a Nazi propaganda film crew. Inside they discover things are not quite as they appear.
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Return to Tomorrow

From a planet bereft of life for half...
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From a planet bereft of life for half a million years, the Enterprise hears the voice of Sargon, who is able to control the ship and tells them transport to specific coordinates which target them to a subterranean chamber. THe away party consisted of Kirk, Spock and McCoy and astro-geologist Ann Mulhall; the security guard they planned to take along was prevented from de-materializing. Sargon is one of only three survivors of the planets intelligent race -pure energy, matter without form. They tell the away party that they once started life on Earth and many other places. Suddenly Sargon possesses Kirk's body, saying he requires Spock and Ann Mulhall's bodies too in order to give the only other survivors of his race new life. He promises the bodies will be returned after they build superior mechanical robots as their definitive bodies, then leaves Kirk's and allows them to beam up and freely make up their minds. Only McCoy isn't tempted enough by curiosity and potential benefits, but Kirk convinces him to re-think his veto. However the human bodies need a metabolic reduction injection; the alien in Spock's body uses Vulcan mind control to make nurse Christine Chapel give Kirk, Sargon's host, an injection that would kill Sargon (and also Kirk). Sargon's wife emplores Sargon to leave Kirk's body before they both die - can Kirk be revived, as his mind is still in Sargon's mind-receptacle from the planet. The aliens have more surprises in store.
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A Private Little War

Kirk returns to the planet Neural...
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Kirk returns to the planet Neural which he had spent time 13 years before. A friend of his from his previous visit is now leader of his people. While trying to uphold the Federation's prime directive, the Klingons are providing more advanced technology to their enemies.
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The Immunity Syndrome

The Enterprise is sent to investigate...
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The Enterprise is sent to investigate the disruption of the Gamma VII-A solar system and the destruction of the USS Intrepid, staffed solely by Vulcans. When they arrive they find a large dark mass floating in space that is draining energy from everything around it, including the Enterprise. Drawn into the mass, they find a huge amoeba-like creature and Kirk must decide which of his two friends, McCoy or Spock, to send into the creature aboard a shuttle craft on a mission of no return.
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A Piece of the Action

The Enterprise is investigating a...
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The Enterprise is investigating a planet visited 100 years ago by the USS Horizon. Kirk, Spock, and McCoy beam down and find themselves in a culture similar to Earth gangs of the 1920's. They are quickly taken prisoner by men in the employ of a mob boss named Bela Oxmyx. He wishes them to give him phasers in exchange for "a piece of the action", and when they refuse Oxmyx puts them under guard. Kirk creates a diversion with a card game called "fizzbin". Without their equipment, the trio must find a way to unite the planet and escape to the Enterprise.
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The Gamesters of Triskelion

Kirk, Uhura and Chekov find...
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Kirk, Uhura and Chekov find themselves suddenly transported light years across the galaxy to the planet Triskelion. There, they learn they are to be trained as thralls, slaves who engage in gladiatorial combat for the pleasure of The Protectors, who amuse themselves by wagering on the outcomes. Outfitted with obedience collars that inflict pain if they disobey, the thralls are submissive and pliant. Kirk eventually challenges The Protectors to wager that will either result in freedom for all of them, or a lifetime of slavery.
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The Trouble with Tribbles

Having received a priority one...
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Having received a priority one distress call from an outlying space station, the Enterprise arrives to find that they have been summoned there by a Federation Commissioner to protect a shipment of seeds meant to sow wheat on Sherman's planet. The planet is also coveted by the Klingons who are taking shore leave on the station. The trouble arises with tribbles - small furry creatures that seem to multiply without end. Their rapid growth reveals a problem with the wheat however and a traitor on the space station.
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Wolf in the Fold

While on shore leave on the planet...
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While on shore leave on the planet Argelius with Dr. McCoy and Captain Kirk, Chief Engineer Scotty finds himself accused of murdering an exotic dancer he met in a nightclub. He has no recollection of the incident but is found standing over the girl with a bloody knife in his hand. For Mr. Hengist, the chief administrator, the case is cut and dried but Jaris, the planet's leader, suggests that his wife chair a s?ance to identify the killer. Tragedy strikes again, still pointing to Scotty as the culprit. Kirk suggests that they retire to the Enterprise where they could use the Enterprise computers to determine if Scott is lying and who the real culprit may be.
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Obsession

Captain Kirk is haunted by a creature...
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Captain Kirk is haunted by a creature from his past when conducting a mining survey on a planet. He first encountered the creature as a Lieutenant aboard the USS Faragut and blames himself for freezing in a moment of crisis causing the death of many crewmen. The creature is a cloud-like, gaseous being that lives on the red blood cells found in humans. Obsessed by his desire for revenge and to erase the memory of 11 years ago, he pursues the creature relentlessly putting in jeopardy an assignment to collect essential medical supplies.
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The Deadly Years

After beaning down to Gamma Hydra IV,...
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After beaning down to Gamma Hydra IV, Kirk, McCoy, Spock and the rest of the landing party suffer from radiation poisoning that induces rapid aging. As they are near the neutral zone with the Romulan Empire, they investigate the possibility of their involvement. Soon, the members of the landing party begin to lose their faculties - they become forgetful and lose concentration. Ensign Chekov is the only member of the landing party who seems unaffected. Unable to effectively perform and with Mr. Spock also affected by the radiation, command falls to Commodore Stocker en route to take command of Star Base 10, but with no experience commanding a star ship. When the Romulans attack, the Enterprise is in grave danger.
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Friday's Child

The Federation is in competition with...
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The Federation is in competition with the Klingons for an alliance with the inhabitants of Capella IV. The Capellans are a warrior tribe and there is dissension among them as to who to sign the mining rights treaty with. McCoy is familiar with their customs having once spent several months there. When a Capellan, who clearly favors the Klingons, stages a coup, Kirk, Spock and McCoy flee with the now dead leader's wife, who is about to give birth. Meanwhile, the Enterprise receives a distress call from a Federation vessel under attack and, with Scotty in command, leaves orbit.
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Journey to Babel

The Enterprise is transporting...
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The Enterprise is transporting several diplomatic delegations to a conference on the future of the mineral-rich planet Babel. Among the passengers are Spock's parents, Ambassador Sarek and Amanda. There is obviously a chill between father and son owing to Spock's choice of pursuing a career in Starfleet. Unknown to Spock or his mother is the fact that Sarek is seriously ill. There is also much tension among the delegations and a spy on board is transmitting coded messages to a ship that attacks the Enterprise. With Captain Kirk wounded in an earlier knife attack, Spock is in temporary command just as his father needs a transfusion that only he can provide.
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Metamorphosis

The Enterprise, carrying a critically...
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The Enterprise, carrying a critically ill Federation Ambassador Nancy Hedford, encounter a mysterious energy cloud which pulls them down to planet Gamma Canaris N, where they meet a castaway. This young man purports to be Zefram Cochrane, the inventor of the Warp Drive over 100 years ago. But in history he had lived to be 80 years of age before disappearing somewhere in space. Apparently the same energy cloud which brought the Enterprise to the planet also rejuvenated Cochrane, making him effectively immortal. Can Kirk get the Enterprise released on time to get the ambassador the medical help she needs, or is there something else in this situation which might be a solution?
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I, Mudd

When an android takes control of the...
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When an android takes control of the Enterprise, Kirk and his crew spend four days traveling at warp speed to an uncharted planet. When they beam down they find none other that Harry Mudd, the apparent ruler of the planet made up entirely of androids. It turns out there is one major problem with Harry's idyllic existence: the androids who serve him hand and foot simply won't allow him to leave. Kirk and Spock devise a way to disable the androids but have their own special plans for Harry.
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Catspaw

When Kirk and his landing party...
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When Kirk and his landing party arrive on the planet below, they are met by eerie mists, a dark castle, witches, goblins and a black cat. They soon learn that they are under the influence of a wizard, Korob, who tries to bend them to his will. They also soon learn that the black cat they saw is more than she appears and is in fact a powerful witch in her right. It is left to Kirk and Spock to find a means to escape their grasp.
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The Doomsday Machine

The U.S.S. Constellation and its crew...
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The U.S.S. Constellation and its crew were destroyed by a giant robot ship which consumes planets for fuel, leaving only a guilt-ridden Commodore Decker aboard the crippled ship. Kirk beams over to begin repairs while Decker beams aboard the Enterprise. After Kirk loses radio contact with the Enterprise, the obsessed Commodore seizes command of the starship, determined to destroy the planet-killer, even at the cost of Kirk's ship and the entire crew.
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The Apple

Kirk and a landing party beam down to...
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Kirk and a landing party beam down to what seems to be an ideal, Eden-like planet. They soon find however that the planet is ruled by a powerful computer that keeps its local inhabitants - primitive and simple tribesmen - happy and healthy. With the Enterprise locked in a tractor beam and slowly being dragged into the planet's atmosphere, Kirk and Spock must find a way to disable to computer. Realizing the threat to its existence, the computer orders the tribesmen to kill the visitors.
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Mirror, Mirror

Beamed up during an ion storm, which...
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Beamed up during an ion storm, which causes a transporter malfunction, the landing party of Kirk, McCoy, Scotty and Uhura find themselves in a mirror universe aboard a parallel Enterprise run by ruthless barbarians. The ion storm also caused their malicious counterparts to beam to the real starship. Kirk and the others must find a way home before they are discovered and exposed by their parallel crew members, who use treachery, back-stabbing and seduction to get what they want.
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The Changeling

The Enterprise encounters a powerful...
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The Enterprise encounters a powerful energy force that has apparently killed all human life in a solar system with over one billion inhabitants. They identify the culprit as a small space probe that had its origins on Earth. Called Nomad, it has merged with another and as a result it has taken a new mission to destroy all biological being as being imperfect. It believes Captain Kirk to be its creator and as such, has spared the Enterprise and its crew, at least temporarily.
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Who Mourns for Adonais?

The Enterprise is stopped dead in its...
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The Enterprise is stopped dead in its tracks by a powerful energy force that appears in the form of a human hand. Soon a being claiming to be Apollo orders Kirk and several others down to the planet below. Apollo claims to have visited Earth 5,000 years ago and Kirk theorizes that he may be telling the truth. Apollo's demand for unquestioned servitude however doesn't give the crew much choice and it becomes imperative that they locate and destroy his power supply.
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Operation - Annihilate!

The Enterprise traces a virus-like...
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The Enterprise traces a virus-like outbreak that seems to be traveling in a direct line across a planetary system. The next planet is home to Kirk's brother Sam, his sister-in-law and their young son. The Enterprise arrives too late however for Sam. They find flying jellyfish-like creatures that attach themselves to humans. They take over the victims nervous system forcing them to bend to their will. Spock finds a weapon to use against the creatures but it leaves him hopelessly blind.
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The City on the Edge of Forever

When a gas accident causes McCoy to...
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When a gas accident causes McCoy to go temporarily insane, he escapes to strange planet. There the search party discovers a device left by a superior, vanished civilization, a time portal which plays the history of earth for them- but then Bones jumps through it into the past, causing a change in history important enough to make the Enterprise vanish. Kirk and Spock, who fortunately made a tricorder recording, must attempt to go through to just before McCoys arrival and stop him changing history in the US during the Great Depression, where they have no advanced technology available.
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The Alternative Factor

While investigating and scanning an...
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While investigating and scanning an uncharted planet the Enterprise and their quadrant of space has been subjected to a violent force which seems to have caused a 'blinking out' of everything near them. When the scan is resumed where once there was no life now there is a life sign on the planet and Kirk, Spock and a security force beam down to investigate and find a man named Lazarus who collapses and is brought aboard Enterprise for treatment. To complicate things further the phenomenon has almost totally drained their dilithium crystals. Starfleet and Kirk suspect that the phenomenon could be a prelude to invasion. While interrogating Lazarus he tells Kirk that he is locked in a struggle with another being who is 'anti life' and is behind the phenomenon. The disruptions continue to occur and the ship's situation grows worse.
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Errand of Mercy

War! The Klingons and the Federation...
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War! The Klingons and the Federation are poised on the brink, and then war is declared. Kirk and Spock visit the planet Organia. Organia, inhabited by simple pastoral folk, lies on a tactical corridor likely to be important in the coming conflict. Whichever side controls the planet has a significant advantage. But the Organians are a perplexing people, apparently unconcerned by the threat of the Klingon occupation or even the deaths of others in their community. Finally, Kirk and the Klingon commander Kor learn why, and the reason will change Federation/Klingon relations for decades to come.
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The Devil in the Dark

The Enterprise travels to the planet...
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The Enterprise travels to the planet Janus 6 to assist the mining colony there. Kirk, Spock and McCoy beam down to the planet where Chief Engineer Vanderberg tells there is a creature loose in the mine tunnels killing some of his men. The monster seems to appear out nowhere and disappears just as quickly. Finding that the creature, known as a Horta, lives in a newly opened part of the underground mining complex, Spock uses the Vulcan mind meld to determine why it is killing the miners.
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This Side of Paradise

The Enterprise is ordered to Omicron...
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The Enterprise is ordered to Omicron Ceti III, believed to be under constant irradiation from deadly Berthold Rays, in order to evacuate all the colonists. Upon arrival, however, it seems that the colonists are in perfect health and furthermore have no desire to leave their home. They are in fact under the influence of plant spores which are keeping them in good health, and which simultaneously keep them in a placid state of happiness and contentment. Mr Spock meets Leilani, an old friend who had been in love with him. Spock is affected by the spores, and is for the first time able to express his love for her in return. Eventually the entire ship is affected, and Kirk is left alone trying to return his crew to sanity.
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A Taste of Armageddon

On a mission to establish diplomatic...
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On a mission to establish diplomatic relations, Kirk and Spock beam down to the planet to learn that its inhabitants have been at war with a neighboring planet for over 500 years. They can find no damage however and no evidence of destruction. They soon learn that the war is essentially a war game where each planet attacks the other in a computer simulation with the victims voluntarily surrendering themselves for execution after the fact. When the Enterprise becomes a victim of the computer simulation and ordered destroyed, Kirk decides it's time to show them exactly what war means.
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Space Seed

The Enterprise finds a 20th century...
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The Enterprise finds a 20th century spaceship which contains dozens of people in suspended animation. While investigating, one of the people is revived automatically. His name is Khan, a strikingly handsome Sihk who charms the Enterprise's historian, Lt. McGivers. While recovering, Khan reads up on the nearly 300 years of history he's missed, plus a lot of technical information on the Enterprise. Through research, Kirk discovers that he's a genetic superman that escaped after the Eugenics Wars of Earth's 20th century. But he's too late: Khan and McGivers have gone back to his ship, revived Khan's crew, and returned to commandeer the Enterprise. Before he's successful, the crew manages to lock out some controls of the ship. Khan attempts to coerce the bridge crew to give him the controls by torturing Kirk in a pressure chamber. They don't relent, and Kirk is believed to have died. However, McGivers had a change of heart and rescued Kirk. Together they initiate an gas attack on Khan's crew, disabling them. Once revived, Kirk realized that Khan's people would be a danger to 23rd century society. He then allows them to colonize a planet, which Lt. McGivers chooses to join them on rather than face a court martial.
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The Return of the Archons

The Enterprise travels to Beta 2 to...
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The Enterprise travels to Beta 2 to learn the fate of the U.S.S. Archon, gone missing a century earlier. One member of the landing party disappears, and one returns in a strangely blissful state. Kirk beams down with another landing party; amidst the chaos of "Festival" their hosts asks if they are "Archons." To learn more, Kirk must convince Betan citizens to disobey Landru, the man who has ruled them for 6,000 years - or find those who already resist. But with the Lawgivers everywhere, that task is going to be difficult...
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Court Martial

The Enterprise goes to a star base...
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The Enterprise goes to a star base after encountering an ion storm for repairs. While there, Kirk files a report about the death of a crewman, LCDR Finney, who was taking scientific readings in an externally mounted instrument pod before Kirk needed to jettison it for the safety of the ship. However, the computer log recorded that Kirk jettisoned the pod before there was a danger, thus indicating perjury and negligence in the death of Finney.
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Tomorrow Is Yesterday

When the Enterprise is flung back in...
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When the Enterprise is flung back in time while trying to escape the gravitational pull of a black star, they find themselves in orbit around a 1960's Earth. When they are seen by a U.S. Air Force pilot, they beam him aboard but then face the dilemma of what to do with him as he learns more and more about the future. They have to review their initial decision to just keep him when historical records show that his yet-to-be-born son will lead Earth's first successful mission to probe Saturn. Spock devises a plan to do so while also erasing any memory of recent events.
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Arena

When an alien race known as the Gorn...
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When an alien race known as the Gorn destroys an Earth colony, the Enterprise pursues the fleeing Gorn vessel until another race of powerful aliens intervene and force Captain Kirk and the Gorn captain to face off in one on one combat in which the winner will be released and the loser, his ship and his crew destroyed.
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The Squire of Gothos

When Kirk and Sulu vanish into thin...
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When Kirk and Sulu vanish into thin air from the bridge of the Enterprise, Spock leads a landing party to the planet below to locate them. What they find is an 18th century castle and a rather foppish man, Trelane, who seems to know a great deal about the Earth - even if it is the wrong time period. If truth be told, Trelane acts like a spoiled little boy and it's obvious Kirk and the others are there to keep him company. They soon realize that if they are to overcome Trelane and free themselves, they must locate and destroy his power source.
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The Galileo Seven

A shuttle craft under Mr. Spock's...
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A shuttle craft under Mr. Spock's command is forced to land on a hostile planet. His emotionless approach to command does not sit well with some crew members, particularly Mr. Boma who challenges Spock at every opportunity. The Enterprise and Captain Kirk meanwhile have only a short time to find the lost shuttle craft as they must deliver urgent medical supplies to Markus III in only a few days.
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Shore Leave

The past three months has left the...
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The past three months has left the crew of the Enterprise exhausted and in desperate need of a break, but does this explain McCoy's encounter with a human-sized white rabbit or Kirk crossing paths with the prankster who plagued his days at Starfleet Academy?
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Balance of Terror

The Enterprise answers a distress...
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The Enterprise answers a distress call from Federation Outpost #4, a monitoring station on the Federation side of the neutral zone with the Romulan Empire. The outposts were established over a century ago and no one has actually seen a Romulan. The Romulan vessel seems to have some type of high energy explosive device as well as a cloaking device to make the ship invisible. When it appears that Romulans bear a strong resemblance to Vulcans, Kirk must deal with a rebellious crew member. He must also engage in a dangerous cat and mouse game with a very intelligent Romulan commander.
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The Conscience of the King

Capt Kirk is informed by an old...
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Capt Kirk is informed by an old friend, a colonial governor, that a Shakespearean acting troupe on his world is led by man once known as Kodos the Executioner. Kodos had most of his colony killed when food supplies ran short rather than have so many starve. The only living witnesses to his actual appearance are Kirk, his friend, and a young crewman on the Enterprise. Kirk dismisses his friend's accusations until his friend is murdered, and his crewman nearly so. But Kodos (now Karidian) denies his identity. Is he telling the truth, and if so, who is behind the murders?
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The Menagerie: Part II

Spock's court martial views the video...
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Spock's court martial views the video stream from Talos IV of Captain Pike's imprisonment 13 years earlier and the Enterprise's attempts to rescue him. Using their powers mind-reading and illusion, the Talosians place Pike in worlds from both his memory and his imagination. The one constant is Vina, the beautiful blonde survivor of a crashed Earth ship, the other half of the Talosians' intended captive Adam and Eve. Number One's attempts to liberate Pike result in herself and another woman captured as additional breeding stock. But when the humans and the Talosians learn more of each other, the situation takes a turn neither side expects. As they watch the past unfold, and as the Enterprise approaches Talos IV once again, Kirk and the court learn the real reason for Spock's mutiny.
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The Menagerie: Part I

While visiting a Starbase 11, the...
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While visiting a Starbase 11, the Enterprise is hijacked by Mr. Spock leaving Captain Kirk but abducting the recently crippled Captain Christopher Pike, former commander of the Enterprise. The destination: Talos IV, off limits by Federation order since the Enterprise first visited the planet thirteen years earlier while then under the command of Captain Pike. After Kirk and Commodore Mendez, the Starbase commander, intercept the Enterprise, a court martial against Spock's apparent treachery is convened. Spock's only defense is the ship's log showing Pike's capture and imprisonment by the inhabitants of Talos IV.
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The Corbomite Maneuver

In a section of unexplored space, the...
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In a section of unexplored space, the Enterprise comes across a marker of sorts that will not let it pass. They destroy the marker and move on but soon find themselves in conflict with an unknown alien who accuses them of trespassing and tells them they have only 10 minutes to live. Kirk decides it's time to play a little poker and literally bluff his way out of the situation by telling the alien that the Enterprise has a device on board that will destroy the alien as well as the Enterprise. The bluff works but the alien turns out to be something quite unexpected.
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Dagger of the Mind

When a psychologically disturbed...
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When a psychologically disturbed member of the staff of the Tantalus penal colony, Dr. Marcus Van Gelder, manages to escape on to the Enterprise, Captain Kirk and Dr. Helen Noel beam down to the planet to see exactly what is going on there. The head of the prison is a renowned penologist, Dr. Tristan Adams, greatly admired for the advances he has made in treating criminals. While Dr. Noel can find no fault with Dr. Adams or the practices at the colony, Kirk isn't so sure. Mr. Spock must use the Vulcan mind meld on Van Gelder to get too the truth.
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Miri

The Enterprise receives an old style...
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The Enterprise receives an old style SOS signal and finds on arrival a planet that is virtually identical to Earth. Kirk, Spock, McCoy and Yeoman Rand beam down to the planet only to find that it is inhabited solely by children. Kirk befriends one of the older children, Miri but they soon learn that experiments to prolong life killed all of the adults and that the children will also die when they reach puberty. They also learn that the children are in fact, very old. Soon, the landing party contracts the virus and have seven days to find a cure.
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What Are Little Girls Made Of?

The crew of the Enterprise arrive at...
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The crew of the Enterprise arrive at the planet EXO-III with some trepidation and great anticipation. They are there to see if hey can locate the renowned scientist Dr. Roger Korby. The man hasn't been heard of for 5 years and the general belief is that he is dead. For Nurse Christine Chapel however, a reunion with Corby will be a reunion with her fiancé. They find Korby alive but when Kirk and Chapel beam down to the planet, they find a man obsessed who is using alien technology to reproduce the humans around him in the form of androids.
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Mudd's Women

After stopping a vessel in space,...
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After stopping a vessel in space, Kirk and the crew find a very odd captain and a very strange cargo. The captain of the vessel is Harcourt Fenton Mudd - known as Harry to his friends - and the cargo are three lovely women he is transporting as brides for lonely men on distant planets. Kirk has a major problem in that while trying to rescue Mudd and his women from his disintegrating ship the Enterprise's lithium crystals used to power the engines were destroyed. They travel to a nearby mining colony where Mudd sets about to arrange marriages for the women and interfering with Kirk's plan to buy the crystals. All the time, the ship's orbit is deteriorating and risks burning up in the atmosphere.
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The Enemy Within

While beaming back aboard the...
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While beaming back aboard the Enterprise, a transporter malfunction results in two vastly different Captains being beamed aboard. His personality has in effect been split into two. One Captain Kirk is weak and indecisive, fearful of making any kind of decision. The other is a mean-spirited and violent man who likes to swill brandy and force himself on female crew members. Meanwhile, the landing party is stuck on the planet below and temperatures are falling rapidly and Scotty is unable to repair the transporter.
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The Naked Time

When Lieutenant Junior Grade Tormolen...
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When Lieutenant Junior Grade Tormolen brings aboard an infection that killed the science team on Psi 2000, the crew of the Enterprise soon find themselves unable to control their most pre-dominant emotions. Soon the entire starship is in a shambles and plummeting toward the self destructing planet.
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Where No Man Has Gone Before

When the Enterprise attempts to...
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When the Enterprise attempts to penetrate a space barrier, it is damaged and creates a potentially worse problem. Two crew members, including Kirk's best friend, gain psionic powers that are growing at a geometric rate. That leaves Captain Kirk with the difficult choice of either marooning them or killing before they get so powerful that they lose their humanity and become truly dangerous.
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Charlie X

The space vessel Antares rescues...
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The space vessel Antares rescues Charles Evans from the forbidding surface of the planet Thasus, and then hurriedly hands him off to the Enterprise. Soon, mysterious happenings dog the boy, who cannot seem to learn certain vital lessons of adulthood. Finally the humiliated teen reveals prodigious psionic powers that could even threaten the survival of the Federation. Who is Charlie, really, and where did he get these abilities?
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The Man Trap

In the series premiere, the...
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In the series premiere, the Enterprise visits planet M-113 where scientist Dr Crater and his wife Nancy, an old girl-friend of Dr McCoy, are studying the remains of an ancient civilization. The Enterprise is charged with resupplying the couple, and Dr McCoy must give them medical exams. Shortly after their arrival, however, crewmen start turning up dead, drained of salt, and left with unusual red marks on their faces. Someone is not who they appear to be, and Kirk and Spock must unravel the clues to discover why, how, and who is responsible.
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