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 ...

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 ...

While on shore leave on the planet Argelius II with Dr. McCoy and Captain Kirk, Chief Engineer Scott finds himself accused of murdering an exotic dancer he met in a night ...

Rapid aging afflicts all six colonists on Gamma Hydra IV and five members of Kirk's six-man landing party - all but Chekov. With the Neutral Zone so close, suspicion fall ...

The Federation is in competition with the Klingons for an alliance with the inhabitants of Capella IV. The Capellans are a warrior tribe and there is dissension among the ...

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 ...

Kirk and a landing party beam down to what seems to be an ideal, Eden-like planet. They soon find however that the planet is ruled by a powerful computer that keeps its l ...

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 ...

The Enterprise receives an old style SOS signal and finds on arrival a planet that is virtually identical to Earth. Kirk, Spock, McCoy and Yeoman Rand beam down to the pl ...

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 ...