Doctor 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.

Raised 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.

An 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.

Split 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.

Rescuing 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.

Helping nurse Christine Chapel search for her fiancé the enterprise finds a detached Dr. Kirby working on a plan to create Android duplicates of key figures, beginning with James Kirk.

On 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.

When 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.

Threatened 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.

Apparently 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.

Contacted 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.

Despite 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.

Crash 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.

Encountering 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.

In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.

Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.

The Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.

The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.

The 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.

The Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.

Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.

The 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.

Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.

Kirk and Spock must travel into the past in order to correct a change that will alter history.

Kirk and the Enterprise must combat parasitic aliens threatening the lives of millions.

First Officer Spock returns to his home world for a brutal Vulcan mating ritual.

The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.

The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.

A 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 crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.

The 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.

Two powerful aliens threaten the well-being of the Enterprise and her crew.

Captain 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.

A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.

The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.

The crew of the Enterprise become entangled in a planet's tribal power struggle.

Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.

Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.

A series of bizarre murders points to Mr. Scott as the prime suspect.

The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.

Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.

The Enterprise visits a planet with an Earth-like 1920s gangster culture.

The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.

The 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.

Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.

The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.

Beings from another galaxy commandeer the Enterprise in an attempt to return home.

Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.

A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.

The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.

While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.

An 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 crew of the Enterprise are on a secret mission to steal a Romulan cloaking device.

An alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.

On 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.

The Enterprise travels with an alien ambassador whose appearance induces madness.

Having 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.

An alien force drives the crew of the Enterprise into brutal conflict with the Klingons.

The 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.

Captain 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.

The 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.

Invisible "time-accelerated" aliens take over the Enterprise and attempt to abduct the crew for use as "genetic stock".

While visiting a doomed planet, the landing party is subject to torturous experiments by powerful aliens.

The USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.

Captain Kirk faces off with a demented shape-shifting starship captain determined to control the universe.

The Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.

A race of overpopulated aliens abduct Captain Kirk to solve their problem.

Kirk, 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.

Strange incorporeal aliens threaten the Memory Alpha station and the Enterprise.

The crew of the Enterprise encounter an immortal human in this science fiction variation on Shakespeare's The Tempest.

The Enterprise picks up a group of space "hippies" looking for Eden.

Captain 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.

Aliens 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.

Kirk, Spock and McCoy are trapped in two parts of another planet's past - a world threatened with destruction when its sun goes supernova.

The Enterprise is in danger when Janice Lester, one of Kirk's former lovers, steals his body.