The Enterprise shuttlecraft, carrying Kirk, Spock, Dr. McCoy and critically ill Federation Ambassador Nancy Hedford, encounters a mysterious energy cloud which pulls them ...

When an android takes control of the Enterprise, Kirk and his crew spend four days traveling at warp speed to an uncharted planet. When they beam down they find none othe ...

When Captain Kirk and his landing party arrive on Pyrus VII, they are met by eerie mists, a dark castle, wailing witches, zombies and a black cat. They soon learn that th ...

The U.S.S. Constellation and its crew were destroyed by a giant robot ship which consumes planets for fuel, leaving only a guilt-ridden Commodore Decker aboard the crippl ...

Beamed up during an ion storm, which causes a transporter malfunction, the landing party of Kirk, McCoy, Scotty and Uhura find themselves in a mirror universe aboard a pa ...

The Enterprise encounters a powerful energy force that has apparently killed all human life in a solar system with over one billion inhabitants. They identify the culprit ...

The Enterprise is stopped dead in its tracks by a powerful energy force that appears in the form of a human hand. Soon, a being claiming to be Apollo orders Kirk (William ...

Lately, Spock's behavior has been increasingly and unprecedentedly erratic. When McCoy finds it to be a growing medical risk, Kirk drags the truth out of him: it is the ' ...

The Enterprise traces a virus-like outbreak that seems to be traveling in a direct line across a planetary system. The next planet is home to Kirk's brother Sam, his sist ...

When an accident causes Dr. McCoy to go temporarily insane, he escapes to a strange planet. There, the search party discovers a device left by a superior, vanished civili ...

War! The Klingons and the Federation are poised on the brink, and then war is declared. Kirk and Spock visit the planet Organia. Organia, inhabited by simple pastoral fol ...

The Enterprise is ordered to clean up the aftermath of a doomed colony on Omicron Ceti III, a planet under constant irradiation from deadly Berthold Rays. Upon arrival, h ...

When the Enterprise is flung back in time while trying to escape the gravitational pull of a black star, they find themselves in orbit around a 1960's Earth. When they ar ...

When a reptilian alien race known as the Gorn destroys an Earth colony, the Enterprise comes under attack by the Gorn vessel. Captain Kirk soon gives chase to the Gorn sh ...

When Kirk and Sulu vanish into thin air from the bridge of the Enterprise, Spock sends a landing party to the planet below to locate them. What they find is an 18th centu ...

A shuttle craft under Mr. Spock's command is forced to land on a hostile planet. His emotionless approach to command does not sit well with some crew members, particularl ...

The past three months has left the crew of the Enterprise exhausted and in desperate need of a break, but does this explain McCoy's encounter with a human-sized white rab ...

The Enterprise answers a distress call from Federation Outpost #4, a monitoring station on the Federation side of the neutral zone with the Romulan Empire. The outposts w ...

In a section of unexplored space, the Enterprise comes across a marker of sorts that will not let it pass. They destroy the marker and move on but soon find themselves in ...

After stopping a vessel in space, Kirk and the crew find a very odd captain with a very strange cargo. The captain of the vessel is Harcourt Fenton Mudd - known as Harry ...

While beaming back aboard the Enterprise, a transporter malfunction results in two vastly different Captain Kirks being beamed aboard. His personality has in effect been ...

When Lieutenant Junior Grade Tormolen brings aboard an infection that killed the science team on Psi 2000, the crew of the Enterprise soon find themselves unable to contr ...

When the Enterprise attempts to penetrate a space barrier, it is damaged and creates a potentially worse problem. Two crew members, including Kirk's best friend, gain psi ...

In the series premiere, the Enterprise visits planet M-113 where scientists Dr. Crater and his wife Nancy, an old girlfriend of Dr. McCoy, are studying the remains of an ...

The Enterprise is transporting its first captain, Robert April, to Babel where he will reluctantly accept his retirement. When the Enterprise attempts to stop an unidenti ...

When an alien probe self-destructs after scanning Earth, the Enterprise backtracks its trail. An alien ship comes along, encases the Enterprise in a force globe, and tran ...

When the Enterprise visits the planet Dramia, Dr. Leonard Bones McCoy is arrested on charges of genocide. Nineteen years ago, McCoy had visited the neighboring planet Dra ...

In the midst of a stand-off with the Rimulans, The Enterprise's computer systems, gain partial sentience, and with it, starts playing practical jokes upon the crew, which ...

An alien observer aboard the Enterprise, capable of detaching its body parts, chooses a dangerous mission to test Kirk and Spock's resourcefulness to deem them worthy of ...

An illness sweeps the Enterprise, easily treatable for all except Spock, for whom it is fatal. Kirk arranges a tight rendezvous to get strobolin, the cure, in time to sav ...

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 ...

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 ...