Charlie Evans, the sole survivor of a transport crash, is transferred to the Enterprise from a different ship. Why are they so eager to rid themselves of him, though? There's more to Charlie than meets the eye...

A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if they don't merge the two back together.

Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.

The Enterprise crew take shore leave on a peaceful, pastoral planet... where their dreams and fantasies come to life.

When a mysterious alien race destroy an Earth colony, the Enterprise pursues, but Kirk and the alien captain are forced to fight each other by powerful aliens.

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

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

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

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

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

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

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

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

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 are on a secret mission to steal a Romulan cloaking device.

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.

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.

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.

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

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