Show Stardate Episode Title
5027.3 The Enterprise Incident
Seeming tense and erratic, Captain Kirk takes the Enterprise into Romulan space and the ship is immediately surrounded by Romulan warships. (released September 27, 1968)
5027.3 And the Children Shall Lead
When the Enterprise finds that all the adults in the Starnes expedition to Triacus have killed themselves, they beam to the planet's surface to investigate. (released October 11, 1968)
5121.5 The Empath
The Enterprise goes to pick up research personnel on the second planet of the star, Minara. While Kirk, Spock and McCoy are on the surface, a radiation storm endangers the starship and Scotty takes the Enterprise out of orbit. (released December 6, 1968)
5143.3 The Survivor
Carter Winston, a long-lost philanthropist, is discovered on board a damaged one-man vessel and is reunited with his fianc (released October 13, 1973)
5267.2 The Time Trap
While exploring the Delta Triangle, where many starships have disappeared, the Enterprise is attacked by several Klingon vessels. (released November 24, 1973)
5275.6 Albatross
The Enterprise arrives at Dramia I to deliver medical supplies when Dr. McCoy is arrested for mass slaughter and imprisoned. (released September 28, 1974)
5329.4 More Tribbles, More Troubles
The Enterprise encounters Cyrano Jones, the Klingons, and a new breed of the popular pest. (released October 6, 1973)
5371.3 One of Our Planets is Missing
The Enterprise crew learns that a massive, planet-destroying, extragalactic entity has entered Federation space and threatens every planet in the galaxy. (released September 22, 1973)
5373.4 Yesteryear
By using the Guardian of Forever, Kirk, Spock, and the historian Erikson explore the planet Orion's past. When they return, there is no record of Spock. (released September 15, 1973)
5423.4 The Mark of Gideon
The United Federation of Planets sends the Enterprise to Gideon, in the hope that the Gideons will accede and become a member. (released January 17, 1969)
5431.4 Spock's Brain
The Enterprise is on a routine mission in deep space when a beautiful young woman beamed onto the bridge. Without a word, she touches a band on her wrist and everyone is rendered unconscious. (released September 20, 1968)
5476.3 For the World is Hollow and I Have Touched the Sky
At the same time McCoy discovers that he has a year to live, the Enterprise encounters the asteroid Yonada which is determined to be artificially propelled. (released November 8, 1968)
5483.7 The Lorelei Signal
The Enterprise enters an uncharted sector of space where Federation and Klingon vessels have been reported missing every 27 years. (released September 29, 1973)
5499.9 The Ambergris Element
The Enterprise arrives to study the planet Argo, a water-based planet where earthquakes caused the land masses to sink. (released December 1, 1973)
5501.2 The Eye of the Beholder
The disappearance of a scientific team lures the Enterprise to investigate near Lactra VII. (released January 5, 1974)
5521.3 Beyond the Farthest Star
The Enterprise is dragged off course by Questar M-17, an imploded negative star mass, and meets a strange shapeless being. (released September 8, 1973)
5554.4 The Infinite Vulcan
While visiting a new planet, Sulu is poisoned and Spock becomes cloned by the Phylosians, a plant-like species. (released October 20, 1973)
none given That Which Survives
As a landing party prepares to beam down to a previously unexplored Class M planet, a beautiful woman, Losira, appears. (released January 24, 1969)
5577.3 The Terratin Incident
A strange flash of light paralyzes the entire Enterprise crew and all organic matter begins to shrink. (released November 17, 1973)
5591.2 Once Upon a Planet
The Enterprise returns to the amusement planet where the crew had once taken shore leave, but this time things go wrong. (released November 3, 1973)
5630.7 Is There In Truth No Beauty
In an attempt to adapt Medusan technology to Federation use, and vice versa, the Enterprise picks up Medusan ambassador Kollos, instrument specialist Lawrence Marvick and telepath Dr. Miranda Jones. (released October 18, 1968)
none given Day of the Dove
A Enterprise landing party beams to a human-colonized planet in answer to a distress call. A Klingon ship, apparently damaged, is detected and a group of Klingons accuse Kirk of having damaged their ship. (released November 1, 1968)
5683.1 The Jihad
On Vedala, Kirk and Spock are summoned to learn about a stolen religious artifact that could ignite a galaxy-wide holy war. (released January 12, 1974)
5693.2 Tholian Web
The Enterprise arrives in an uncharted area of space to answer a distress call from the Defiant. The starship is visible on their viewscreen, but sensors on board the Enterprise say that it is not. (released November 15, 1968)
5710.5 Wink of an Eye
The Enterprise responds to a distress call from the planet Scalos; the call shows several Scalosians asking for assistance. Arriving at Scalos, however, the crew find only an empty city, with no life forms registering on tricorder scans. (released November 19, 1968)
5718.3 Whom Gods Destroy
Elba II, a planet with a poisonous atmosphere, also has a facility beneath its surface for the incurably, criminally insane. The Enterprise is bringing a new medicine with which they hope to eliminate mental illness forever. (released January 3, 1969)
5725.3 The Lights of Zetar
The Enterprise's mission is to take Lt. Mira Romaine to Memory Alpha, the central library for the United Federation of Planets. While in orbit, an energy storm destroys all the inhabitants of Memory Alpha. (released January 31, 1969)
5730.2 Let That Be Your Last Battlefield
The Enterprise intercepts a stolen Federation shuttlecraft which contains a humanoid named Lokai. Taken aboard the ship, Lokai tells the crew he is from the planet Cheron, and asks for asylum on the Enterprise. (released January 10, 1969)
5784.2 Plato's Stepchildren
When the Enterprise receives a distress call from the planet Platonius, Kirk, Spock and McCoy beam down to the planet's surface. The Platonians, while powerful psycho kinetics, have no resistance against physical injury. (released November 22, 1968)
5818.4 The Cloud Minders
The Enterprise comes to the planet Ardana to acquire zienite, a rare mineral needed to stop a planet-wide plague. The zienite is not available, however, because the miner class Troglytes are rebelling against the rulers of Ardana, who live in the cloud-city of Stratos. (released February 28, 1969)
5832.3 The Way to Eden
Chasing the stolen vessel Aurora, the Enterprise rescues the thieves just before the Aurora is destroyed. The group is led by Dr. Sevrin in a search for a mythological planet named Eden, a planet reputed to be a paradise. (released February 21, 1969)
5843.7 Requiem For Methuselah
Rigellian fever, an extremely deadly plague, strikes the Enterprise crew. Kirk, Spock and McCoy beam down to a supposedly uninhabited planet, Holberg 917-G, in search of the only known antidote, ryetalyn. (released February 14, 1969)
5906.4 The Savage Curtain
The Enterprise is scanned by a powerful energy source coming from the planet Excalbia. The starship had been sent to survey the planet, but it was thought to consist of nothing but a lavalike surface without inhabitants. (released March 7, 1969)
5928.5 Turnabout Intruder (series finale)
On their way to Beta Aurigae, the Enterprise receives a call for help from Camus II. The landing party finds only Janice Lester and Dr. Coleman, who claim that the everyone else was killed by celebium radiation. (released June 3, 1969)
5943.7 All Our Yesterdays
The crew of the Enterprise investigate the planet Sarpeidon whose sun is soon to go nova. Upon beaming to the surface, Kirk, Spock, and McCoy discover the inhabitants gone and a library containing the planet's accumulated knowledge. (released March 14, 1969)