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.
The Man Trap (Episode 1) 7.0
Writer: George Clayton Johnson
Air date: 1966-09-08
Runtime: 50 min
Overview: Kirk and his crew are at deadly risk from an alien creature that feeds on the salt in a human body and can take on any form.
Charlie X (Episode 2) 6.7
Writer: D.C. Fontana
Air date: 1966-09-15
Runtime: 51 min
Overview: Charlie Evans, the sole survivor of a transport crash, is transferred to the Enterprise from a different ship. Why are they so eager to rid themselves of him, though? There's more to Charlie than meets the eye...
Where No Man Has Gone Before (Episode 3) 7.1
Writer: Samuel A. Peeples
Air date: 1966-09-22
Runtime: 51 min
Overview: While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives some crewmen strange powers.
The Naked Time (Episode 4) 7.2
Writer: John D. F. Black
Air date: 1966-09-29
Runtime: 51 min
Overview: A strange alien substance causes the crew to lose their inhibitions.
The Enemy Within (Episode 5) 7.2
Writer: Richard Matheson
Air date: 1966-10-06
Runtime: 50 min
Overview: A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if they don't merge the two back together.
Mudd's Women (Episode 6) 6.5
Writer: Gene Roddenberry
Air date: 1966-10-13
Runtime: 50 min
Overview: The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.
What Are Little Girls Made Of? (Episode 7) 7.2
Writer: Robert Bloch
Air date: 1966-10-20
Runtime: 50 min
Overview: Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.
Miri (Episode 8) 6.9
Writer: Adrian Spies
Air date: 1966-10-27
Runtime: 50 min
Overview: Kirk and a landing party are stranded on a planet due to a disease that causes any adult to die a painful death, and must deal with the local children who have survived.
Dagger of the Mind (Episode 9) 6.9
Writer: Shimon Wincelberg
Air date: 1966-11-03
Runtime: 50 min
Overview: Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.
The Corbomite Maneuver (Episode 10) 7.5
Writer: Jerry Sohl
Air date: 1966-11-10
Runtime: 50 min
Overview: The Enterprise encounters a vast alien ship that threatens the Enterprise with destruction.
The Menagerie (1) (Episode 11) 7.7
Writer: Gene Roddenberry
Air date: 1966-11-17
Runtime: 49 min
Overview: Spock kidnaps his former captain, the crippled Christopher Pike, and heads for a quarantined planet, putting his career and Kirk's life on the line.
The Menagerie (2) (Episode 12) 7.8
Writer: Gene Roddenberry
Air date: 1966-11-24
Runtime: 50 min
Overview: Spock's court-martial continues as he attempts to justify his abduction of Pike, the theft of the Enterprise, and his heading for a planet declared forbidden by Starfleet.
The Conscience of the King (Episode 13) 6.7
Writer: Barry Trivers
Air date: 1966-12-08
Runtime: 50 min
Overview: Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.
Balance of Terror (Episode 14) 8.3
Writer: Paul Schneider
Air date: 1966-12-15
Runtime: 50 min
Overview: Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.
Shore Leave (Episode 15) 6.7
Writer: Theodore Sturgeon
Air date: 1966-12-29
Runtime: 50 min
Overview: The Enterprise crew take shore leave on a peaceful, pastoral planet... where their dreams and fantasies come to life.
The Galileo Seven (Episode 16) 7.3
Writer: Oliver Crawford
Air date: 1967-01-05
Runtime: 50 min
Overview: Spock commands a stranded away team when their shuttlecraft crash lands on a planet with hostile natives.
The Squire of Gothos (Episode 17) 7.0
Writer: Paul Schneider
Air date: 1967-01-12
Runtime: 50 min
Overview: The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself an 18th century Englishman.
Arena (Episode 18) 7.3
Writer: Gene L. Coon
Air date: 1967-01-19
Runtime: 51 min
Overview: When a mysterious alien race destroy an Earth colony, the Enterprise pursues, but Kirk and the alien captain are forced to fight each other by powerful aliens.
Tomorrow Is Yesterday (Episode 19) 7.4
Writer: D.C. Fontana
Air date: 1967-01-26
Runtime: 50 min
Overview: In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.
Court Martial (Episode 20) 7.3
Writer: Don Mankiewicz
Air date: 1967-02-02
Runtime: 50 min
Overview: Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.
The Return of the Archons (Episode 21) 7.2
Writer: Gene Roddenberry
Air date: 1967-02-09
Runtime: 50 min
Overview: The Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.
Space Seed (Episode 22) 8.4
Writer: Gene L. Coon
Air date: 1967-02-16
Runtime: 50 min
Overview: The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.
A Taste of Armageddon (Episode 23) 7.9
Writer: Gene L. Coon
Air date: 1967-02-23
Runtime: 50 min
Overview: The Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.
This Side of Paradise (Episode 24) 7.7
Writer: D.C. Fontana
Air date: 1967-03-02
Runtime: 50 min
Overview: The Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.
The Devil in the Dark (Episode 25) 7.9
Writer: Gene L. Coon
Air date: 1967-03-09
Runtime: 50 min
Overview: Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.
Errand of Mercy (Episode 26) 8.0
Writer: Gene L. Coon
Air date: 1967-03-23
Runtime: 50 min
Overview: The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates Organia, a humble planet, inhabited by pacifists, that is unwittingly caught in the middle.
The Alternative Factor (Episode 27) 5.6
Writer: Don Ingalls
Air date: 1967-03-30
Runtime: 51 min
Overview: Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
The City on the Edge of Forever (Episode 28) 8.6
Writer: D.C. Fontana
Air date: 1967-04-06
Runtime: 50 min
Overview: Kirk and Spock must travel into the past in order to correct a change that will alter history.
Operation: Annihilate! (Episode 29) 7.1
Writer: Steven W. Carabatsos
Air date: 1967-04-13
Runtime: 50 min
Overview: Kirk and the Enterprise must combat parasitic aliens threatening the lives of millions.
