"Star Trek," the original TV series created by Gene Roddenberry, aired from 1966 to 1969. It follows the interstellar adventures of Captain James T. Kirk and the crew of the USS Enterprise, a starship of the United Federation of Planets.
Set in the 23rd century, the series explores new worlds and seeks new life and civilizations. It addresses social issues of the 1960s, such as war, race, and technology, through allegorical storytelling.
The diverse crew, including Mr. Spock, Dr. McCoy, and others, encounters various challenges and moral dilemmas during their space explorations.
The Man Trap: The crew of the USS Enterprise encounters a shape-shifting creature that drains the salt from human bodies
Charlie X: The crew must deal with a young man with god-like powers who has been stranded alone on a planet since childhood.
Where No Man Has Gone Before: An encounter with a mysterious energy barrier grants one of the crew members god-like abilities, endangering the ship.
The Naked Time: A mysterious infection causes the crew to lose their inhibitions, leading to dangerous and emotional consequences.
The Enemy Within: A transporter malfunction splits Captain Kirk into two beings, one good and one evil, causing chaos on the ship.
Mudd's Women: The crew encounters Harry Mudd and three women with mysterious beauty-enhancing drugs, leading to trouble.
What Are Little Girls Made Of?: Kirk and Nurse Chapel search for her fiancé on a mysterious planet with androids and a sinister scientist.
Miri: The crew discovers a parallel Earth inhabited by children who never age and a deadly disease that threatens them.
Dagger of the Mind: Dr. McCoy is sent to a penal colony where mind-altering experiments have dangerous consequences.
The Corbomite Maneuver: The crew faces off against an alien vessel and its enigmatic commander in a tense game of strategy.
The Menagerie, Part 1: Spock is put on trial after hijacking the Enterprise to take Captain Pike to a mysterious planet.
The Menagerie, Part 2: The true motives behind Spock's actions are revealed as the crew explores the planet Talos IV.
The Conscience of the King: Kirk suspects a Shakespearean actor of being a notorious war criminal from the past.
Balance of Terror: The Enterprise engages in a cat-and-mouse battle with a Romulan Bird-of-Prey on the edge of the Neutral Zone.
Shore Leave: The crew encounters a planet where their deepest desires and fears become reality.
The Galileo Seven: Spock and a landing party become stranded on a hostile planet, facing danger from both the environment and the natives.
The Squire of Gothos: The crew encounters a powerful and capricious being named Trelane who enjoys tormenting them.
Arena: Kirk is forced into a one-on-one battle with a powerful alien known as the Gorn by advanced beings called the Metrons.
Tomorrow is Yesterday: The Enterprise accidentally travels back in time to the 20th century and must find a way to return without altering history.
Court Martial: Captain Kirk is put on trial for the death of a crew member, and his career is on the line.
The Return of the Archons: The crew investigates a planet controlled by a computer that enforces a strict, emotionless way of life.
Space Seed: The crew discovers a group of genetically enhanced humans led by Khan Noonien Singh, who poses a threat to the ship.
A Taste of Armageddon: The Enterprise becomes involved in a simulated war between two planets where citizens willingly submit to "death by execution."
This Side of Paradise: Spores on a peaceful planet have a profound effect on the crew, making them abandon their duties and embrace blissful existence.
The Devil in the Dark: The crew must deal with a silicon-based life form that is killing miners on a remote planet.
Errand of Mercy: Kirk and Spock attempt to prevent the Klingon Empire from taking over a peaceful planet in the Organian Neutral Zone.
The Alternative Factor: The fabric of space-time is threatened when an enigmatic man named Lazarus claims to be in a battle with his antimatter counterpart.
The City on the Edge of Forever: A time portal leads Kirk and Spock to 1930s Earth, where they must make a heartbreaking decision to save the future.
Operation -- Annihilate!: The crew investigates a wave of madness and death caused by parasitic creatures that control their hosts.
In addition to the episodes listed above, in the original unaired pilot for the series, The Cage, Captain Christopher Pike and his crew encounter a telepathic species while exploring the planet Talos IV. This episode has since been shown on television and is considered now to be episode 0.
Spock's Brain: - The Enterprise crew pursues aliens who have stolen Spock's brain.
The Enterprise Incident: The crew attempts to steal a Romulan cloaking device.
The Paradise Syndrome: Kirk loses his memory and starts a new life with a Native American-like tribe on an alien planet.
And the Children Shall Lead: The Enterprise rescues children controlled by an evil entity on a deserted planet.
Is There in Truth No Beauty?: An alien ambassador who causes insanity in humans is transported by the Enterprise.
Spectre of the Gun: The crew is forced to re-enact the shootout at the O.K. Corral on an alien planet.
Day of the Dove: An alien entity incites hatred and violence between the Enterprise crew and Klingons.
For the World Is Hollow and I Have Touched the Sky: The Enterprise discovers a civilization living inside a hollow asteroid.
The Tholian Web: Kirk is trapped between dimensions while the Enterprise is ensnared by a Tholian web.
Plato's Stepchildren: The crew encounters a race of telekinetic humanoids who model their society on Ancient Greek ideals.
Wink of an Eye: Invisible, time-accelerated aliens take over the Enterprise.
The Empath: The crew encounters an empathic being while exploring a doomed planet.
Elaan of Troyius: The Enterprise transports a princess whose tears are biochemically potent.
Whom Gods Destroy: Kirk deals with an insane former starship captain in a mental facility.
Let That Be Your Last Battlefield: Two aliens from a war-torn planet continue their conflict aboard the Enterprise.
The Mark of Gideon: Kirk is abducted by aliens from an overpopulated planet.
That Which Survives: The Enterprise crew visits an outpost guarded by a mysterious computer.
The Lights of Zetar: Strange alien life forms threaten a memory storage facility and the Enterprise crew.
Requiem for Methuselah: The crew meets an immortal human who lives in seclusion on his own planet.
The Way to Eden: The Enterprise is hijacked by a doctor and his followers seeking paradise.
The Cloud Minders: Kirk tries to obtain vital minerals from a world with a class-based society.
The Savage Curtain: Kirk and Spock are forced to fight in an alien experiment on good versus evil.
All Our Yesterdays: The crew is trapped in the past of a planet about to be destroyed by a nova.
Turnabout Intruder: Kirk's consciousness is swapped with a woman seeking command of the Enterprise.
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