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.

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

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

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

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

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

Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.

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 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.

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

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

Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.

Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.

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

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

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

The Enterprise encounters a vast alien ship that threatens the Enterprise with destruction.

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

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

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

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