The Enterprise's sensor readings indicate a planet unsuitable for any carbon-based life at the level of a developed civilization. Suddenly they get an apparition in space ...

In order to save an inhabited planet from being destroyed by a botanical plague, the Enterprise goes to pick up zenite, the mineral cure, on the only known planet where i ...

When Kirk, Spock and McCoy beam down to a supposed uninhabited planet to gather the mineral ryetalyn to fight a plague of Rigelian fever on-board the Enterprise, they fin ...

The Enterprise is on course to install new equipment on Memory Alpha, the central library storage facility for the Federation. Chief Engineer Scott has been working close ...

After the Enterprise landing party beams down to investigate a geologically interesting planet, their ship is hurled across the galaxy. Kirk and company find a deserted o ...

While beaming down to the planet Gideon, Captain Kirk finds himself still in the transporter room. He can find no one on the ship, now apparently abandoned by the entire ...

While on a mission of mercy, the Enterprise comes across a shuttle craft stolen from Starbase 4. Its occupant is Lokai, a humanoid who is exactly half black and half whit ...

The Enterprise travels to the planet Elba II, home of the last asylum for the criminally insane, to deliver a serum that should cure all of its remaining inmates. Kirk an ...

The Enterprise transports Elaan, a member of the ruling dynasty of the warrior Elasians, to the planet of their enemy, the Troyians, so that her arranged marriage will ha ...

The Enterprise responds to a distress call from the planet Scalos, but when Kirk and a landing party beam down to the planet they find no living beings. It turns out that ...

On an urgent medical emergency, Kirk, Spock and McCoy encounter an alien society that had once flourished on earth during the time of Plato. Since reaching their current ...

Kirk and the derelict starship Defiant vanish into a spatial interphase between universes. To rescue him, Spock must maintain position despite a growing, violent hysteria ...

The Enterprise in attacked by a missile, launched from an asteroid on an independent collision course with highly populated planet, Darren 5, in 396 days, which has simpl ...

Having found a Federation colony of 100 people completely destroyed, Kirk and the Enterprise have to deal with a nearby Klingon vessel which they believe must be responsi ...

When the Enterprise trespasses into uncharted territory, Kirk, Spock, McCoy, Scott and Chekov are transported to a location that has all the trappings of the American Old ...

The Enterprise transports the Medusan Ambassador Kollos; his telepathic interpreter, Dr Miranda Jones; and Engineer Laurence Marvick. Only Vulcans and those trained in Vu ...

The Enterprise responds to a distress call from the scientific colony on Triacus and arrives to find that all of the adults are dead. Oddly, the children seem unaffected ...

The Enterprise deliberately crosses the Neutral Zone, on Kirk's orders, into Romulan space and is promptly surrounded by Romulan warships, each equipped with a cloaking d ...

The Enterpise is approached by an ion-propelled craft (much to Eng. Scott's liking); from it enters a female who renders everyone unconscious. When the crew wakes up, McC ...

When the Enterprise is assigned to observe Earth's history in 1968, suddenly it intercepts a transporter beam which originates at least a thousand light-years from Earth, ...

While searching for the crew of a destroyed spaceship, the Enterprise discovers a planet whose oppressive government is a 20th-century version of Earth's Roman Empire. Ki ...

Captain Kirk replies to an urgent (yet brief) message from Commodore Enright, which only tells him to report to the nearest space station. Once there, most of the crew is ...

As the Enterprise approaches planet Omega IV, they find another starship, the U.S.S. Exeter, in orbit. Kirk, Spock and McCoy beam aboard to find the ship abandoned but st ...

Kirk, Spock, McCoy and a couple of red shirts beam down to the surface of a planet in answer to a fake distress call. There they are overpowered by a small group of human ...

The Enterprise searches the reportedly primitive and warlike planet, Ekos, for the missing Federation cultural observer, Professor John Gill (David Brian). When Kirk (Wil ...

From a planet bereft of life for half a million years, the Enterprise hears the voice of Sargon, who is able to control the ship and tells them to transport to specific c ...

Kirk returns to the planet where he spent time 13 years before. A friend from his previous visit is now leader of his people. While trying to uphold the Federation's prim ...

The Enterprise is sent to investigate the disruption of the Gamma VII-A solar system and the destruction of the U.S.S. Intrepid, staffed solely by Vulcans. When they arri ...

The Enterprise investigates a planet visited 100 years ago by the U.S.S. Horizon. Kirk, Spock, and McCoy beam down and find themselves in a culture similar to Earth gangs ...

Kirk, Uhura and Chekov find themselves suddenly transported light years across the galaxy to the planet Triskelion. There, they are trained as thralls, slaves who engage ...

Having received a Priority One distress call from an outlying space station, the Enterprise arrives to find they have been summoned there by a Federation commissioner mer ...

Captain Kirk is haunted by a creature from his past when conducting a mining survey on a planet. He first encountered it as a lieutenant aboard the U.S.S. Farragut and bl ...