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The Man TrapThe Man TrapOpen episodeDoctor Leonard “Bones” McCoy meets a former girlfriend when the enterprise brings supplies to a remote archaeological survey group. Still attractive to McCoy, the woman's current appearance hides a dark and deadly secret.
Charlie XCharlie XOpen episodeRaised from boyhood by non-corporeal beings, 17 year old Charles Evans is picked up and transferred to the Enterprise. On board the ship, the teenager proves dangerously unable to wield his enormous psionic powers with maturity.
Where No Man Has Gone BeforeWhere No Man Has Gone BeforeOpen episodeWhen Enterprise encounters a Force Field at the edge of the Galaxy, one of the crew members psionic abilities are accelerated to God like proportions causing him to become a powerful murderous being.
The Naked TimeThe Naked TimeOpen episodeAn alien virus strips the enterprise crew of their inhibitions, causing chaos as each crew member is overcome by hidden emotions. Meanwhile, the Enterprise is being pulled inexorably into a nearby planet's gravity well.
The Enemy WithinThe Enemy WithinOpen episodeSplit by a transporter malfunction into two beings with very different personalities, the resulting twin Captain Kirk proves that neither a purely evil nor a sweetly good captain can survive without the missing half.
Mudd's WomenMudd's WomenOpen episodeRescuing the crew of a ship from an asteroid belt, the Enterprise plays host to conman extraordinaire, the cunning Harry Mudd and his cargo: three beautiful women looking for suitors.
What Are Little Girls Made Of?What Are Little Girls Made Of?Open episodeHelping nurse Christine Chapel search for her fiancé, the Enterprise finds a detached Dr. Korby working on a plan to create Android duplicates of key figures, beginning with James Kirk.
MiriMiriOpen episodeOn a planet populated by children whose aging process has been slowed artificially. Kirk’s landing party members contract a virus that kills adults. Despite their violent attacks, Kirk is determined to help the children.
Dagger of the MindDagger of the MindOpen episodeWhen a wild eyed maniac escaping from the Tantalus Penal Colony turns out to be one of the psychiatric staff, Kirk investigates the institution and discovers a chilling exercise in mind control.
The Corbomite ManeuverThe Corbomite ManeuverOpen episodeThreatened by the sinister captain of a powerful alien vessel, Kirk claims that the Enterprise carries a powerful explosive which will destroy both ships. The move produces unexpected actions from the alien adversary.
The Menagerie (1)The Menagerie (1)Open episodeApparently summoned to Star Base 11, Kirk, Spock and McCoy visit a former Enterprise Commander, the paralyzed and horribly disfigured Christopher Pike. Uncharacteristically, Spock commandeers the Enterprise, then turns himself in for court martial.
The Menagerie (2)The Menagerie (2)Open episodeSpock's court martial reveals the actions of Captain Pike on his previous visit to Talos IV, where the powerful Talosians tried to persuade Pike to breed with women provided for the purpose.
The Conscience of the KingThe Conscience of the KingOpen episodeContacted by one of the other two witnesses to the crimes of mass murderer “Kodos the Executioner,” Kirk is persuaded that the criminal may be disguising himself as an actor in a traveling theatrical troupe.
Balance of TerrorBalance of TerrorOpen episodeDespite the earlier Romulan war, the Romulans have never been seen in person. The Enterprise, in pursuit of a Romulan aggressor, makes a discovery that causes suspicion about a senior crew member.
Shore LeaveShore LeaveOpen episodeWhen McCoy sees the White Rabbit from Alice in Wonderland, the crew begins to realize that the planet they are visiting seems to have the dangerous power to turn any thought into reality.
The Galileo SevenThe Galileo SevenOpen episodeCrash landing on a planet populated by hostile giants, the 7-man crew of the shuttlecraft Galileo find themselves unable to communicate with the enterprise or to escape the planet's atmosphere.
The Squire of GothosThe Squire of GothosOpen episodeEncountering an uncharted planet in an empty region of space, Kirk and his crew are entertained by Trelane, a playful being who lacks the self-control to wield his great psionic powers with discipline.
ArenaArenaOpen episodeWith both their ships held captive by powerful beings, Kirk and the captain of the alien vessel are placed on an asteroid to fight for their lives and the lives of their crews.
Tomorrow Is YesterdayTomorrow Is YesterdayOpen episodeIn a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.
Court MartialCourt MartialOpen episodeCaptain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.
The Return of the ArchonsThe Return of the ArchonsOpen episodeThe Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.
Space SeedSpace SeedOpen episodeThe Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.
A Taste of ArmageddonA Taste of ArmageddonOpen episodeThe Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.
This Side of ParadiseThis Side of ParadiseOpen episodeThe Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.
The Devil in the DarkThe Devil in the DarkOpen episodeKirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.
Errand of MercyErrand of MercyOpen episodeThe Federation and the Klingon Empire teeter on the brink of war as Kirk investigates Organia, a humble planet, inhabited by pacifists, that is unwittingly caught in the middle.
The Alternative FactorThe Alternative FactorOpen episodeKirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
The City on the Edge of ForeverThe City on the Edge of ForeverOpen episodeKirk and Spock must travel into the past in order to correct a change that will alter history.
Operation: Annihilate!Operation: Annihilate!Open episodeKirk and the Enterprise must combat parasitic aliens threatening the lives of millions.
Amok TimeAmok TimeOpen episodeFirst Officer Spock returns to his home world for a brutal Vulcan mating ritual.
Who Mourns for Adonais?Who Mourns for Adonais?Open episodeThe crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.
The ChangelingThe ChangelingOpen episodeThe crew of the USS Enterprise deals with an indestructible planet-destroying space probe.
Mirror, MirrorMirror, MirrorOpen episodeA transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.
The AppleThe AppleOpen episodeThe crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.
The Doomsday MachineThe Doomsday MachineOpen episodeThe starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.
CatspawCatspawOpen episodeTwo powerful aliens threaten the well-being of the Enterprise and her crew.
I, MuddI, MuddOpen episodeCaptain Kirk has a second run-in with the conman, Harry Mudd. Mudd is now the supreme ruler of a planet of androids who cater to his every whim.
MetamorphosisMetamorphosisOpen episodeA shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.
Journey to BabelJourney to BabelOpen episodeThe Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.
Friday's ChildFriday's ChildOpen episodeThe crew of the Enterprise become entangled in a planet's tribal power struggle.
The Deadly YearsThe Deadly YearsOpen episodeStrange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
ObsessionObsessionOpen episodeCaptain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.
Wolf in the FoldWolf in the FoldOpen episodeA series of bizarre murders points to Mr. Scott as the prime suspect.
The Trouble With TribblesThe Trouble With TribblesOpen episodeThe Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.
The Gamesters of TriskelionThe Gamesters of TriskelionOpen episodeCaptain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.
A Piece of the ActionA Piece of the ActionOpen episodeThe Enterprise visits a planet with an Earth-like 1920s gangster culture.
The Immunity SyndromeThe Immunity SyndromeOpen episodeThe crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.
A Private Little WarA Private Little WarOpen episodeThe crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and is forced to help maintain a balance of power.
Return to TomorrowReturn to TomorrowOpen episodeAncient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.
Patterns of ForcePatterns of ForceOpen episodeThe crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.
By Any Other NameBy Any Other NameOpen episodeBeings from another galaxy commandeer the Enterprise in an attempt to return home.
The Omega GloryThe Omega GloryOpen episodeCaptain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.
The Ultimate ComputerThe Ultimate ComputerOpen episodeA skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.
Bread and CircusesBread and CircusesOpen episodeThe Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.
Assignment: EarthAssignment: EarthOpen episodeWhile back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.
Spock's BrainSpock's BrainOpen episodeAn alien female beams aboard the ship and, after incapacitating the rest of the crew, surgically removes Spock's brain. Kirk and the crew have just hours to locate and replace it before Spock's body dies.
The Enterprise IncidentThe Enterprise IncidentOpen episodeThe crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.
The Paradise SyndromeThe Paradise SyndromeOpen episodeAn alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.
And the Children Shall LeadAnd the Children Shall LeadOpen episodeOn a distant planet, Kirk, Spock and McCoy find a scientific team dead, and their children who, unknown to the crew, have great powers at their disposal.
Is There in Truth No Beauty?Is There in Truth No Beauty?Open episodeThe Enterprise travels with an alien ambassador whose appearance induces madness.
Spectre of the GunSpectre of the GunOpen episodeHaving been found trespassers into Melkotian space, Captain Kirk and his companions are sent to die in a re-enactment of the gunfight at the O.K. Corral.
Day of the DoveDay of the DoveOpen episodeAn alien force drives the crew of the Enterprise into brutal conflict with the Klingons.
For the World Is Hollow and I Have Touched the SkyFor the World Is Hollow and I Have Touched the SkyOpen episodeThe crew of the Enterprise rush to stop an asteroid from colliding with a Federation world, but discover the asteroid is actually an inhabited generation ship.
The Tholian WebThe Tholian WebOpen episodeCaptain Kirk is caught between dimensions while the crew of the Enterprise works to retrieve him. All the while, the Tholians demand that the Enterprise leave their space.
Plato's StepchildrenPlato's StepchildrenOpen episodeThe crew of the Enterprise encounters an ageless and sadistic race of humanoids with the power of telekinesis and who claim to have organized their society around Ancient Greek ideals.
Wink of an EyeWink of an EyeOpen episodeInvisible "time-accelerated" aliens take over the Enterprise and attempt to abduct the crew for use as "genetic stock".
The EmpathThe EmpathOpen episodeWhile visiting a doomed planet, the landing party is subject to torturous experiments by powerful aliens.
Elaan of TroyiusElaan of TroyiusOpen episodeThe USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.
Whom Gods DestroyWhom Gods DestroyOpen episodeCaptain Kirk faces off with a demented shape-shifting starship captain determined to control the universe.
Let That Be Your Last BattlefieldLet That Be Your Last BattlefieldOpen episodeThe Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.
The Mark of GideonThe Mark of GideonOpen episodeA race of overpopulated aliens abduct Captain Kirk to solve their problem.
That Which SurvivesThat Which SurvivesOpen episodeKirk, McCoy, and Sulu are stranded on a barren planet where a mysterious woman attempts to kill them one at a time, while the Enterprise must travel halfway across the galaxy to rescue them.
The Lights of ZetarThe Lights of ZetarOpen episodeStrange incorporeal aliens threaten the Memory Alpha station and the Enterprise.
Requiem for MethuselahRequiem for MethuselahOpen episodeThe crew of the Enterprise encounter an immortal human in this science fiction variation on Shakespeare's The Tempest.
The Way to EdenThe Way to EdenOpen episodeThe Enterprise picks up a group of space "hippies" looking for Eden.
The Cloud MindersThe Cloud MindersOpen episodeCaptain Kirk races against time to acquire plague-fighting minerals from a world in the midst of a civil uprising against a grievous social class disparity.
The Savage CurtainThe Savage CurtainOpen episodeAliens force Captain Kirk and First Officer Spock to join forces with "Abraham Lincoln" and "Surak" to battle villains in a contest of good vs. evil.
All Our YesterdaysAll Our YesterdaysOpen episodeKirk, Spock and McCoy are trapped in two parts of another planet's past - a world threatened with destruction when its sun goes supernova.
Turnabout IntruderTurnabout IntruderOpen episodeThe Enterprise is in danger when Janice Lester, one of Kirk's former lovers, steals his body.