| ShortSummary | - 8.520552E8
- While the USS Enterprise escorts two robot cargo ships carrying quintotriticale, a new seed grain, to famine stricken Sherman's Planet, it encounters a Klingon battlecruiser pursuing a Federation scout ship. When the Enterprise rescues the pilot, the Klingons attack with a new energy weapon and demand that the pilot be handed over to them.
- On board the Enterprise, Uhura has taken command due to Scotty's irrational behavior. Uhura orders an all-female landing party to transport down to rescue the men.
- Kirk and Spock manage to counter the Klingon weapon. Now at a disadvantage, the Klingons offer to settle for just the glommer. Kirk agrees and returns it—along with several well-fed tribbles that scare it away. McCoy injects the remaining tribbles on the Enterprise with a serum to slow down their metabolic rate. They are finally "safe".
- A giant clone of Keniclius, named Keniclius Five, kidnaps Mr. Spock in order to clone him and create an intergalactic peacemaker, at the expense of the original Spock's life.
- While exploring the Delta Triangle, where many starships have disappeared, the USS Enterprise is attacked by several Klingon vessels. During the battle they are caught in an ion storm. The Enterprise and one Klingon battlecruiser are drawn into a spacetime vortex and end up in a timeless dimension.
- The entity is still alive and it beams aboard the Enterprise. Captain Kirk must find a way to get rid of the invader, without destroying his ship in the process.
- A mysterious being threatens to destroy the Enterprise if the crew is unable to solve an ancient puzzle.
- While exploring on the outermost rim of the galaxy the USS Enterprise is pulled into the orbit of a dead star. Trapped there, the crew discovers that there is an ancient derelict pod ship trapped with them as well.
- A strange energy field causes the Enterprise computer to play practical jokes on the crew, but the humor soon turns to danger.
- Patrolling near the Romulan Neutral Zone, the USS Enterprise finds a ship manned by Carter Winston, a Federation citizen and philanthropist who has been missing for five years.
- While exploring near the center of the galaxy, the USS Enterprise is caught inside an energy/matter vortex and all her computer systems fail. A being named Lucien appears on the bridge, repairs the ship's systems and takes the crew to explore his planet, Megas-Tu.
- While observing a burnt-out supernova, the USS Enterprise picks up a strange message transmitted in a two-hundred-year-old code.
- After arriving on the planet they are taken prisoner by the Taurean women. The landing party begins to age rapidly as a result of life-draining headbands they are forced to wear.
- The USS Enterprise receives orders to arrest Federation outlaw Harry Mudd, who is accused of selling fake love crystals. Intercepting Harry on the mining colony of Motherlode, they bring him aboard the Enterprise.
- The Enterprise crew beams down to discover a series of unusual environments. On the planet the crew meets the Lactrans, a group of twenty foot slugs with intelligent capacities far beyond their own. The team is captured by the Lactrans to be made part of a zoo collection.
- Doctor McCoy is arrested for allegedly causing a deadly plague which once ravaged the planet Dramia.
- An unusual spaceship pulls the Enterprise into a "negative universe" where time seems to flow backwards.
- While in the Taurean system signals begin to affect the male crew, causing them to hallucinate. Captain Kirk, Spock, Doctor McCoy, and Lieutenant Carver beam down to the source of the signals.
- The crew discover the planet's Keeper is now dead and the untended machinery is constructing dangerous images from the crew members' thoughts. Lt. Uhura is captured by the planet's master computer, who in the wake of the Keeper's death, resents being made to serve humans. After a number of unpleasant adventures and narrow escapes, Kirk succeeds in interviewing the angry computer. He convinces it that its best course is to resume business as usual, as it will be rewarded with social contact by the many guests attracted by the planet's facilities and can, in time, learn everything it could possibly want to without even being put to the inconvenience of leaving its home planet.
- The Enterprise encounters a giant cloud creature that feeds on the energy of the planets that lie in its path. They determine it is heading for Mantilles, home to a Federation colony governed by former Starfleet officer Bob Wesley ".
- Spock must travel to the past to rescue his younger self from danger.
- The Enterprise crew is taken captive by a race of primitives on a newly discovered planet.
- While visiting the newly discovered planet Phylos, Lt. Sulu picks up a walking plant, called a Retlaw, and is poisoned. The alien species that inhabit the planet, who are plantlike beings, approach and save Sulu's life.
- Jones is now selling tribbles genetically engineered to omit their ordinarily unrestrained multiplicative proclivities. Dr. McCoy discovers that although Jones' "new" tribbles don't reproduce, they still have ravenous appetites. Instead of reproducing, they now grow hugely fat.
- The USS Enterprise arrives at the Vedala asteroid, where Captain Kirk and Mr. Spock have been summoned to learn about a stolen religious artifact, the "Soul of the Skorr", whose theft could ignite a galactic holy war.
- In the shuttlecraft Copernicus, Mr. Spock, Uhura, and Sulu are en route to Starbase 25 to deliver a stasis box—a rare artifact of the Slaver culture when the Kzinti intervene.
- The pilot turns out to be Cyrano Jones, an intergalactic trader well known to Kirk and crew from "The Trouble With Tribbles". The Klingons desperately want Jones for introducing the tribble to Klingon planets where it has become a major pest, and for stealing a glommer, an animal the Klingons were breeding to prey on the tribble.
- Kirk and crew beam aboard the huge starship and learn it was once home to an insect race. They also learn that the ship's crew self-destructed rather than carry a malevolent entity to other worlds.
- In the shuttlecraft Copernicus, Mr. Spock, Uhura, and Sulu are en-route to Starbase 25 to deliver a stasis box—a rare artifact of the Slaver culture when the Kzinti intervene.
- While exploring the water planet Argo, Captain Kirk and Mr. Spock are transformed into water breathers by the planet's undersea inhabitants, the Aquans. In order to return to their normal selves, they must enlist the help of the Aquans to capture a giant sur-snake, whose venom holds the antidote.
- The Enterprise crew revisits the "amusement park" planet first seen in the Classic Trek episode "Shore Leave" hoping for some rest and relaxation.
- Kirk expresses sympathy for the Klingons' plight but refuses to hand over Jones, a Federation citizen.
- Spock contracts a fatal illness, and the cure can only be found with dangerous Orion pirates.
- On this planet, magic and witchcraft are quite normal. The Megans are an ageless species that had, at one time, lived on Earth, and were responsible for the legends about witches. Lucien, their guide, is in reality the Lucifer of Earth mythology.
- The disappearance of a scientific team lures the USS Enterprise to investigate near Lactra VII. The starship Ariel is located there, abandoned, with its captain having transported to the planet's surface.
- From them the crew discovers that most of the Phylosians were wiped out by a plague brought to the planet by Dr. Keniclius, a Terran scientist who survived Earth's Eugenics Wars.
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