Kirk and the Enterprise must combat parasitic aliens.

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

The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates a humble planet caught in the middle – Organia, inhabited by pacifists

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

The Enterprise crew is trapped in paradise when they come to rescue colonists who have fallen to pacifying alien spores and become infected themselves.

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

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

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.

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

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

Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.

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 encounters a vast alien ship that sets out to test them.

The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.

A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.

Captain Kirk must learn the limits to the power of a 17-year-old boy with the psychic ability to create anything and destroy anyone.