Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.

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 strange alien substance causes the crew to lose their inhibitions.

Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.

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

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.

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.

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

Spock commands a stranded away team when their shuttlecraft is stranded on a planet with hostile natives.

The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself an 18th century Englishman.

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.

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

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

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.

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.

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.

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

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.

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.

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