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

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

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.

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

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

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 USS Enterprise deals with an indestructible planet-destroying space probe.

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

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