Space. The Final Frontier. The U.S.S. Enterprise embarks on a five year mission to explore the galaxy. The Enterprise is under the command of Captain James T. Kirk with First Officer Mr. Spock, from the planet Vulcan. With a determined crew, the Enterprise encounters Klingons, Romulans, time paradoxes, tribbles and genetic supermen led by Khan Noonian Singh. Their mission is to explore strange new worlds, to seek new life and new civilizations, and to boldly go where no man has gone before.
Amok Time (Episode 1) 8.3
Writer: Theodore Sturgeon
Air date: 1967-09-15
Runtime: 50 min
Overview: First Officer Spock returns to his home world for a brutal Vulcan mating ritual.
Who Mourns for Adonais? (Episode 2) 6.6
Writer: Gene L. Coon
Air date: 1967-09-22
Runtime: 51 min
Overview: The crew of the Enterprise are held captive by an alien who turns out to be the Greek god Apollo.
The Changeling (Episode 3) 7.6
Writer: John Meredyth Lucas
Air date: 1967-09-29
Runtime: 50 min
Overview: The crew of the USS Enterprise deals with an indestructible planet-destroying space probe.
Mirror, Mirror (Episode 4) 8.5
Writer: Jerome Bixby
Air date: 1967-10-06
Runtime: 50 min
Overview: A transporter mishap swaps Captain Kirk and his companions with their evil counterparts in a parallel universe. In the so-called Mirror Universe, the Enterprise is a ship of the Terran Empire, an organization as evil as the United Federation of Planets is benevolent.
The Apple (Episode 5) 6.7
Writer: Gene L. Coon
Air date: 1967-10-13
Runtime: 50 min
Overview: The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.
The Doomsday Machine (Episode 6) 8.1
Writer: Norman Spinrad
Air date: 1967-10-20
Runtime: 51 min
Overview: The starship Enterprise and its heavily-damaged sister ship, the USS Constellation, must work together to stop an alien planet-killing machine headed for the heart of Federation territory.
Catspaw (Episode 7) 6.3
Writer: D.C. Fontana
Air date: 1967-10-27
Runtime: 50 min
Overview: Two powerful aliens threaten the well-being of the Enterprise and her crew.
I, Mudd (Episode 8) 7.3
Writer: Gene Roddenberry
Air date: 1967-11-03
Runtime: 51 min
Overview: Captain Kirk has a second run-in with the conman, Harry Mudd. Mudd is now the supreme ruler of a planet of androids who cater to his every whim.
Metamorphosis (Episode 9) 7.1
Writer: Gene L. Coon
Air date: 1967-11-10
Runtime: 50 min
Overview: A shuttle crew from the USS Enterprise encounters a man out of history and his mysterious alien companion.
Journey to Babel (Episode 10) 8.1
Writer: D.C. Fontana
Air date: 1967-11-17
Runtime: 50 min
Overview: The Enterprise must transport dignitaries to a peace conference, with an assassin on the loose.
Friday's Child (Episode 11) 6.7
Writer: D.C. Fontana
Air date: 1967-12-01
Runtime: 50 min
Overview: The crew of the Enterprise become entangled in a planet's tribal power struggle.
The Deadly Years (Episode 12) 7.5
Writer: David P. Harmon
Air date: 1967-12-08
Runtime: 50 min
Overview: Strange radiation exposes the command crew of the Enterprise to the effects of rapid aging.
Obsession (Episode 13) 7.0
Writer: Art Wallace
Air date: 1967-12-15
Runtime: 50 min
Overview: Captain James T. Kirk becomes obsessed with destroying a deadly entity he once encountered in his youth.
Wolf in the Fold (Episode 14) 7.0
Writer: Robert Bloch
Air date: 1967-12-22
Runtime: 51 min
Overview: A series of bizarre murders points to Mr. Scott as the prime suspect.
The Trouble With Tribbles (Episode 15) 8.3
Writer: David Gerrold
Air date: 1967-12-29
Runtime: 50 min
Overview: The Enterprise must protect a very important shipment of grain from both Klingons and some adorable creatures called tribbles.
The Gamesters of Triskelion (Episode 16) 7.1
Writer: Margaret Armen
Air date: 1968-01-05
Runtime: 50 min
Overview: Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.
A Piece of the Action (Episode 17) 7.4
Writer: Gene L. Coon
Air date: 1968-01-12
Runtime: 50 min
Overview: The Enterprise visits a planet with an Earth-like 1920s gangster culture.
The Immunity Syndrome (Episode 18) 7.5
Writer: Robert Sabaroff
Air date: 1968-01-19
Runtime: 50 min
Overview: The crew of the Enterprise encounters an energy-draining field which may be able to destroy the galaxy.
A Private Little War (Episode 19) 6.9
Writer: Gene Roddenberry
Air date: 1968-02-02
Runtime: 51 min
Overview: The crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and is forced to help maintain a balance of power.
Return to Tomorrow (Episode 20) 7.4
Writer: John T. Dugan
Air date: 1968-02-09
Runtime: 50 min
Overview: Ancient alien minds are given control of Captain Kirk's and First Officer Spock's bodies.
Patterns of Force (Episode 21) 7.6
Writer: John Meredyth Lucas
Air date: 1968-02-16
Runtime: 50 min
Overview: The crew of the Enterprise tracks down a Federation observer on a planet dominated by a "Naziesque" regime.
By Any Other Name (Episode 22) 7.6
Writer: D.C. Fontana
Air date: 1968-02-23
Runtime: 50 min
Overview: Beings from another galaxy commandeer the Enterprise in an attempt to return home.
The Omega Glory (Episode 23) 6.3
Writer: Gene Roddenberry
Air date: 1968-03-01
Runtime: 50 min
Overview: Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.
The Ultimate Computer (Episode 24) 7.8
Writer: D.C. Fontana
Air date: 1968-03-08
Runtime: 50 min
Overview: A skeleton Enterprise crew are assigned to test a revolutionary computer system that is given total control of the ship.
Bread and Circuses (Episode 25) 6.9
Writer: Gene L. Coon
Air date: 1968-03-15
Runtime: 50 min
Overview: The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.
Assignment: Earth (Episode 26) 7.2
Writer: Gene Roddenberry
Air date: 1968-03-29
Runtime: 50 min
Overview: While back in time observing Earth in 1968, the Enterprise crew encounters the mysterious Gary Seven who has his own agenda on the planet.
