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

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

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.

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

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

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.

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

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.

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

Spock'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.

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

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.

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

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.

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.

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.

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

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

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

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

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.

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

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

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

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.

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

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.

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

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

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.

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

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.

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.

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

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

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.

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

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

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

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.

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

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

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.