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The Man Trap
Sep 08, 1966
A shape-shifting, salt-craving creature terrorizes the crew of Enterprise
Sep 15, 1966
A powerful teenage boy wreaks havoc aboard the Enterprise
Where No Man Has Gone Before
Sep 22, 1966
While exploring the energy barrier at galaxy's edge that crippled an earlier ship, Kirk's long-time friend and crewmate Gary Mitchell begins mutating into a god-like entity disdainful of the "mortals" around him.
The Naked Time
Sep 29, 1966
The Enterprise crew catch a virus that removes their inhibitions
The Enemy Within
Oct 06, 1966
A transporter malfunction creates an evil Kirk
Oct 13, 1966
The Enterprise rescues con artist Harry Mudd and his "beautiful" female cargo
What are Little Girls Made Of
Oct 20, 1966
Nurse Chapel's long-lost fiance is found - along with his androids.
Oct 27, 1966
A strange group of children are discovered on an Earth-like planet.
Dagger of the Mind
Nov 03, 1966
A new treatment for the criminally insane has deadly results
The Corbomite Maneuver
Nov 10, 1966
While exploring an uncharted area of space, the Enterprise is outmatched and taken in tow by a massive spherical spaceship
The Menagerie, Part I
Nov 17, 1966
Spock hijacks the Enterprise to return an injured Captain Pike to Talos IV
The Menagerie, Part II
Nov 24, 1966
The Talosians force Kirk to view Captain Pike's original mission to their world
The Conscience of the King
Dec 08, 1966
Kirk suspects Shakespearean actor Anton Karidian as a mass murderer.
Balance of Terror
Dec 15, 1966
After attacking an outpost, Romulans battle the Enterprise
Dec 29, 1966
While on shore leave, the crew's thoughts mysteriously come to life
The Galileo Seven
Jan 05, 1967
Seven Enterprise crew members go on a shuttle mission with Spock in command
The Squire of Gothos
Jan 12, 1967
A powerful entity known as Trelane torments the crew of the Enterprise.
Jan 19, 1967
Mysterious aliens pit Kirk against a Gorn in a barehanded duel.
Tomorrow Is Yesterday
Jan 26, 1967
A time accident leaves the Enterprise a UFO over 20th century Earth.
Feb 02, 1967
Kirk is recalled for a potential court-martial
The Return of the Archons
Feb 08, 1967
A world run by a computer named Landru traps the Enterprise crew.
Feb 15, 1967
Kirk meets Khan, a leader of Earth's Eugenics Wars of the 1990s.
A Taste of Armageddon
Feb 22, 1967
A computerized war fought by two planets ensnares the Enterprise.
This Side of Paradise
Mar 01, 1967
The Enterprise visits a colony where floral spores bring peaceful contentment.
The Devil in the Dark
Mar 08, 1967
An unknown monster threatens a critical mining operation.
Errand of Mercy
Mar 22, 1967
Kirk and Spock battle Klingons to free Organia.
The Alternative Factor
Mar 29, 1967
An alien being fights himself across two realities.
The City on the Edge of Forever
Apr 05, 1967
Kirk and Spock go back in time to save McCoy -- and their own universe.
Apr 12, 1967
The Enterprise crew must rid planet Deneva -- and Spock -- of deadly parasites.