The Enterprise finds an ancient abandoned starship with a malevolent entity aboard, eager to take over the Starfleet ship. ...

Upon his return from a journey through the Guardian of Forever Kirk realizes that history has been altered and no one remembers Spock. An Andorian is now his First Office ...

The crew of the Enterprise must stop a living planet-consuming cloud before it attacks an inhabited world. ...

A mysterious signal from an unexplored planet mesmerizes the male crewmen of the Enterprise into daydreaming of fantasy women. Female crewmen remain unaffected. Following ...

En route to Sherman's Planet with two robot ships stuffed with quintotriticale, Kirk veers off course to protect Cyrano Jones when a Kilingon ship fires upon his vessel. ...

Famous humanitarian Carter Winston, missing for five years, has been discovered and beamed aboard the Enterprise. As luck would have it, his fiancée, Anne Nored, current ...

On the unexplored planet Phylos, Kirk's landing party discovers as entirely plant-based civilization. The Phylosians claim to be peaceful, and readily cure Sulu of an acc ...

The USS Enterprise explores the center of the galaxy, looking for the heart of creation. When a matter-energy whirlwind grips the ship, a satyr calling himself Lucien app ...

With the crew in need of shore leave, Kirk directs the Enterprise for a return visit to the Amusement Park planet, but it shortly becomes evident that the planet is no lo ...

Once again, Kirk rounds up incorrigible miscreant Harcourt Fenton Mudd, this time trying to sell a love potion to miners. Once incarcerated aboard the Enterprise, Mudd in ...

While on a mapping mission, the Enterprise receives an outdated transmission from the star Cephas. A flash of light from its lone, volcanic planet passes through the ship ...

Sent to explore the vast Delta Triangle (a veritable Bermuda Triangle in space where vessels have disappeared for centuries), the Enterprise encounters three Klingon ship ...

The Enterprise investigates conditions on planet Argo, currently a water world whose previous dry world history matches events about to befall a nearly identical Federati ...

Spock, Uhura and Sulu are en route on a shuttlecraft to Starbase 25 to deliver a Slaver Stasis box - an artifact from a long-dead civilization inside of which time stands ...

Kirk takes the Enterprise to Lactra VII to investigate the disappearance of a Federation science team. While on Lactra, large slug-like aliens add them to their zoo (unit ...

Kirk and Spock accept a secret mission to a mad planet where they'll search, as two in a six-member team of specialists, for a stolen relic. Three previous expeditions ha ...