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Captain Kirk and the crew of the U.S.S. Enterprise boldly go where no man has gone before, exploring strange new worlds and discovering new civilizations.
- The Cage
The Cage
Christopher Pike and the U.S.S. Enterprise investigate a crash site on Talos IV, where the captain is imprisoned by powerful telepathic aliens and studied.
- The Man Trap
The Man Trap
Captain Kirk and the Enterprise deliver supplies to planet M-113, where McCoy is reunited with an old flame. A salt-sucking shapeshifter begins attacking the crew. - Charlie X
Charlie X
The Enterprise brings aboard a young, undisciplined man with unimaginable powers -- which he uses against the crew to get what he wants.
- Where No Man Has Gone...
Where No Man Has Gone Before
One of the Enterprise's own crew threatens the ship when an alien energy force gives him god-like powers. Kirk must sacrifice his friend for the good of the galaxy -- if he can. - The Naked Time
The Naked Time
The Enterprise crew is infected by an alien virus, which accentuates their wildest emotions and desires. - The Enemy Within
The Enemy Within
A transporter accident separates Kirk into two people -- a kind and gentle Kirk, and a strong and unscrupulous Kirk. The crew must reunite the two and restore their captain. - Mudd's Women
Mudd's Women
The Enterprise welcomes a freighter captain and three beautiful women, who turn the heads of every man on board -- but who are using a powerful drug to maintain their appearances. - What Are Little Girls...
What Are Little Girls Made Of?
Nurse Chapel is reunited with her long-lost fiancée, who has created a colony of android clones and plans to take over the Enterprise -- and the Federation. - Miri
Miri
The Enterprise finds a world ravaged by disease, where the only survivors are a group of children -- who themselves suffer and die upon reaching adulthood. - Dagger of the Mind
Dagger of the Mind
Kirk and the Enterprise crew investigate a penal colony, where the facility's reputable director gives the captain a first-hand look at his neural neutralizer device.
- The Corbomite Maneuver
The Corbomite Maneuver
When the Enterprise is caught in a deadly conflict with an unknown alien vessel, Kirk must use all his wits to escape. - The Menagerie, Part I
The Menagerie, Part I
Spock kidnaps his former captain and commandeers the Enterprise, prompting a court martial where he presents the story of Christopher Pike's fateful mission to the planet Talos IV. - The Menagerie, Part II
The Menagerie, Part II
The fate of Spock and Christopher Pike hang in the balance as Kirk and Commodore Mendez watch the story of Pike's alien incarceration years before. - The Conscience of the King
The Conscience of the King
Captain Kirk grows suspicious that a respected actor from a visiting theatrical troupe was once a notorious mass-murderer. - Balance of Terror
Balance of Terror
Kirk and crew battle an invisible enemy -- a Romulan warbird that has crossed the Neutral Zone and attacked Federation outposts. Spock's loyalties are questioned when the first Romulan visual transmission is intercepted. - Shore Leave
Shore Leave
The crew find an idyllic world where their wildest dreams -- and darkest nightmares -- come true. - The Galileo Seven
The Galileo Seven
Spock, McCoy, Scott and four crewmen crash land on a hostile alien planet, and Kirk must choose between looking for them or delivering desperately-needed medical supplies to a plague-stricken world. - The Squire of Gothos
The Squire of Gothos
The Enterprise crew is captured by an impetuous and eccentric being with tremendous powers, and Kirk must challenge him to a duel if they hope to escape. - Arena
Arena
Powerful aliens transport Kirk to a barren planet, forcing him to fight to the death with an unstoppable Gorn enemy.
- Tomorrow is Yesterday
Tomorrow is Yesterday
The Enterprise is thrown back into the past, where Kirk and his crew must prevent a military sighting of the ship from changing Earth's history. - Court Martial
Court Martial
Captain Kirk is accused of violating procedure and blamed for the death of an officer and friend, leading to his court martial. - The Return of the Archons
The Return of the Archons
The Enterprise investigates a world where a Federation starship disappeared more than a century before, and find a civilization controlled by a group of "law givers" and the enigmatic Landru. - Space Seed
Space Seed
The crew finds a sleeper ship from the 20th century, and revive a genetically-altered military leader who attempts to take over the ship: the cunning and powerful Khan.
- A Taste of Armageddon
A Taste of Armageddon
Kirk acts to stop the slaughter of thousands of people when the crew finds a civilization fighting a virtual war with computers. - This Side of Paradise
This Side of Paradise
The crew attempt to evacuate a human colony, but spores from a local plant alter their minds, leading to an all-out mutiny. Spock explores his emotional side. - The Devil in the Dark
The Devil in the Dark
An alien creature kills workers in a Federation mining colony, and the Enterprise crew must discover its shocking motives. - Errand of Mercy
Errand of Mercy
Kirk and Spock come face-to-face with the Klingon Empire during a mission to establish a Federation presence on the planet Organia, and find that the local people have no desire to defend themselves from the Klingons. - The Alternative Factor
The Alternative Factor
The Enterprise finds the pilot of a space-time ship struggling with an evil version of himself from an alternate dimension -- and must stop the destruction of the entire universe. - The City on the Edge...
The City on the Edge of Forever
Dr. McCoy inadvertantly changes history, wiping the Federation from existence. Kirk and Spock must follow him through a portal to Earth's 20th century to set things right. - Operation: Annihilate!
Operation: Annihilate!
An alien organism attacks Spock, and the only way to kill the parasite may be deady to the Vulcan officer.
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The adventures of the Enterprise crew continue, as the ship encounters alien lifeforms and a few familiar faces.
- Amok Time
Amok Time
Spock falls victim to the Vulcan mating drive, Pon Far, and must travel to his home planet to end his struggle -- in a death match with Captain Kirk. - Who Mourns for Adonais?
Who Mourns for Adonais?
The crew is held captive by a powerful being who manifests himself in the form of the Greek god Adonais -- and demands that the crew worship him. - The Changeling
The Changeling
The Enterprise crew encounters a 200-year-old Earth probe, believed to be responsible for the destruction of an entire star system -- and brings it on board the ship. - Mirror, Mirror
Mirror, Mirror
A transporter accident sends Kirk, Scott, Uhura and McCoy to an alternate dimension, where the unscrupulous crew advance in rank through assassination, and the Enterprise is poised to destroy a world.
- The Apple
The Apple
The crew finds a seemingly peaceful world controlled by a super-computer, where the very environment around them reveals itself to be deadly. - The Doomsday Machine
The Doomsday Machine
The Enterprise faces an ancient planet killer that has entered our galaxy, and an unstable Federation commander tries to use the ship to stop it. - Catspaw
Catspaw
The Enterprise is threatened by a pair of aliens bent on conquest, who use a powerful device to instill terror in their victims.
- I, Mudd
I, Mudd
The crew finds galactic scoundrel Harry Mudd on an unnamed planet, where a group of androids cater to his every whim. - Metamorphosis
Metamorphosis
Kirk and crew discover a legendary Federation scientist -- believed to be long-dead, but kept alive for centuries by a formless alien entity. - Journey to Babel
Journey to Babel
The Enterprise ferries a group of Federation diplomats to a peace conference, including Spock's father -- who falls deathly ill, forcing the Vulcan first officer to weigh the importance of his duty. - Friday's Child
Friday's Child
Kirk, Spock and McCoy arrive on an alien world to negotiate a mining treaty, but must protect the pregnant widow of the planet's murdered leader from a coup attempt. The Enterprise comes face-to-face with a Klingon war ship in orbit. - The Deadly Years
The Deadly Years
The crew of the Enterprise is stricken with an illness that causes rapid aging, incapacitating even the command staff -- and leaving the ship vulnerable to Romulan attack. - Obsession
Obsession
Captain Kirk defies orders to pursue a blood-sucking cloud creature he believes to be responsible for the deaths of half his crew 11 years ago. - Wolf in the Fold
Wolf in the Fold
Multiple murders lead to an investigation by the Enterprise crew, with all evidence pointing to Scotty as the perpetrator. - The Trouble With Tribbles
The Trouble With Tribbles
The Enterprise crew arrives on a space station to defend it from a possible Klingon attack -- but find that the biggest threat may come from a mass of gentle, furry creatures. - The Gamesters of Triskelion
The Gamesters of Triskelion
Kirk is forced to fight a group of alien prisoners in an arena, while those who enslave them -- and his crew -- gamble on the outcome. - A Piece of the Action
A Piece of the Action
The crew find a civilization that has modeled itself after mobsters of 1920's Earth, and Kirk and Spock must play their roles in order to end a lifestyle of constant violence. - The Immunity Syndrome
The Immunity Syndrome
The Enterprise encounters a giant space amoeba believed to be responsible for the destruction of a Federation starship -- and an entire solar system. Kirk must choose between Spock and McCoy for a suicide mission. - A Private Little War
A Private Little War
Kirk returns to a primitive, peaceful world he visited once before, only to discover that the Klingons have armed a tribe in conflict with his friend's. - Return to Tomorrow
Return to Tomorrow
The Enterprise picks up a group of disembodied aliens, who are allowed to assume the bodies of three of the crew in order to construct new forms of their own -- though they may not be willing to give them up. - Patterns of Force
Patterns of Force
The Enterprise investigates the disappearance of a Federation historian, and the crew discovers that the world he is on has shaped itself in the oppressive image of Nazi Germany. - By Any Other Name
By Any Other Name
The Enterprise is hijacked by a group of explorers from another galaxy, who intend to use the ship to make the long journey back home -- and turn most of the crew into small mineral blocks. - The Omega Glory
The Omega Glory
Kirk and Spock find themselves in the middle of a civil war, perpetuated by a rogue Federation captain. - The Ultimate Computer
The Ultimate Computer
The Enterprise is chosen to be the test ship for a new, highly-advanced computer -- which proceeds to take control of the vessel and lead it into a deadly war games scenario. - Bread and Circuses
Bread and Circuses
Kirk, Spock and McCoy are captured by a Romanesque civilization while investigating the destruction of a Federation ship, and are forced to fight in a gladiator arena for the local population's entertainment. - Assignment: Earth
Assignment: Earth
The Enterprise travels back to 20th century Earth, and finds a man from an alien world attempting to manipulate human history -- who claims to be preventing Earth from destroying itself.
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The Enterprise's five-year mission continues, as Kirk, Spock and crew fight Romulans, Klingons, and the occasional beautiful but deadly woman.
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Spock's Brain
Spock's Brain
An alien invader steals Spock's brain to operate her civilization's central control system, and the crew must locate it and find a way to return it to his body before Spock dies.
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The Enterprise Incident
The Enterprise Incident
Captain Kirk takes the ship on a dangerous, secret mission into Romulan space, in an attempt to acquire a cloaking device. Spock's loyalties are tested by a beautiful Romulan commander.
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The Paradise Syndrome
The Paradise Syndrome
Kirk is stranded on a primitive world when an alien device strikes him with amnesia. As the captain falls in love and becomes a part of the natives' world, the Enterprise searches for a way to save the planet from an asteroid collision.
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And the Children Shall Lead
And the Children Shall Lead
The Enterprise finds a group of children who have survived a mass-suicide, with help from a powerful alien entity -- who leads them in taking over the ship to find a new planet for him to control.
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Is There In Truth No Beauty?
Is There In Truth No Beauty?
The Enterprise hosts a Medusan ambassador, whose physical appearance causes madness in humans. But when a distraught scientist maroons the ship beyond our galaxy, Spock must mind-meld with the alien to find the way home.
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Spectre of the Gun
Spectre of the Gun
After trespassing into Melkotian space, Kirk and four of the crew find themselves in an alien-created reinactment of the deadly battle at the OK Corral.
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Day of the Dove
Day of the Dove
Captain Kirk is forced to bring a group of angry Klingons on board, which quickly escalates into a battle for control of the ship -- with both groups being manipulated by a malevolent alien entity.
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For the World Is Hollow
For the World Is Hollow and I Have Touched the Sky
The crew rushes to save from destruction a civilization made inside an asteroid, as Dr. McCoy faces a terminal illness with no known cure.
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The Tholian Web
The Tholian Web
The Enterprise investigates a starship that is phasing out of existence, and Captain Kirk is lost. A pair of Tholian ships attack as a mysterious illness threatens to drive the crew insane.
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Plato's Stepchildren
Plato's Stepchildren
A group of super-powerful aliens take control of the crew for their own amusement. Kirk and the others must discover the source of their amazing powers if they are to counter them.
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Wink of an Eye
Wink of an Eye
An alien species attempts to use the Enterprise crew to save their dying race, drawing Captain Kirk into their own rapidly-accelerated state of existence.
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The Empath
The Empath
Kirk, Spock and McCoy are captured and brought to an alien laboratory, where they are tortured one-by-one in order to test a beautiful, empathic healer's capacity for self-sacrifice.
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Elaan of Troyius
Elaan of Troyius
When the Enterprise ferries a reluctant bride to her wedding with the leader of a warring planet, Kirk attempts to educate her in the ways of her new culture. But a Klingon attack threatens the peace her marriage would bring.
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Whom Gods Destroy
Whom Gods Destroy
Kirk and Spock deliver a new medicine to a subterranean prison for the criminally insane, only to find out that one of the prisoners -- once a starship captain -- has taken over.
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Let That Be Your Last...
Let That Be Your Last Battlefield
Two alien men come on board the Enterprise, bringing their war of racial bigotry with them. Kirk tries to mediate the conflict, but his patience runs out when one of them attempts to seize control of the ship.
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The Mark of Gideon
The Mark of Gideon
While on a diplomatic mission to a world free of disease -- but plagued by over-population -- Kirk finds himself alone with a woman on a precise replica of the Enterprise.
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That Which Survives
That Which Survives
Kirk and his crew must defend the ship -- and their very lives -- from the touch of a mysterious woman bent on their destruction.
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The Lights of Zetar
The Lights of Zetar
The Federation's central library facility is wiped out by non-corporeal entities, who seek out the Enterprise and take the body of a young lieutenant as a host.
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Requiem for Methuselah
Requiem for Methuselah
The crew is infected with a deadly plague, and seek the antidote from a world inhabited solely by an enchanting woman and a man straight out of Earth's history.
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The Way to Eden
The Way to Eden
The Enterprise pursues a vessel stolen by a group searching for a mythical paradise world, and bring them aboard when their ship is destroyed.
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The Cloud Minders
The Cloud Minders
Seeking the cure to a planet-wide plague, Captain Kirk and his crew find themselves in the middle of a conflict between the miners of Ardana and the ruling class, who live in a city in the clouds.
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The Savage Curtain
The Savage Curtain
An alien creature locks the Enterprise crew in combat with history's most notorious villains in a test of good versus evil, conjuring great heroes from the past to fight along side them.
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All Our Yesterdays
All Our Yesterdays
The Enterprise discovers a massive library on a deserted world where the sun is about to go nova, and Kirk, Spock and McCoy are accidentally sent into dangerous periods in the planet's history.
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Turnabout Intruder
Turnabout Intruder
Kirk's jealous former lover secretly exchanges bodies with the captain, allowing her to finally command a starship -- and trapping him in her radiation-stricken body.