Show	Stardate	Episode
	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. (original air date: 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. (original air date: 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. (original air date: 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 (original air date: 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. (original air date: 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. (original air date: September 28, 1974)
	5329.4	More Tribbles, More Troubles
	The Enterprise encounters Cyrano Jones, the Klingons, and a new breed of the popular pest. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: December 1, 1973)
	5501.2	The Eye of the Beholder
	The disappearance of a scientific team lures the Enterprise to investigate near Lactra VII. (original air date: 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. (original air date: 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. (original air date: October 20, 1973)
	557?.?	That Which Survives
	As a landing party prepares to beam down to a previously unexplored Class M planet, a beautiful woman, Losira, appears. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: October 18, 1968)
	566?.?	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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: 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. (original air date: March 14, 1969)
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