Aired: 9/20/1968
The crew of the Enterprise pursues a mysterious woman who has abducted Spock's brain.
Aired: 9/27/1968
An apparently insane Capt. Kirk has the Enterprise deliberately enter the Romulan Neutral Zone where the ship is immediately captured by the enemy.
Aired: 10/4/1968
Trapped on a planet whose inhabitants are descended from Northwestern Native Americans, Kirk loses his memory and is proclaimed a God while the crippled Enterprise races back to the planet before it is destroyed by an asteroid.
Aired: 10/11/1968
The Enterprise reaches a Federation colony where the adults have all killed themselves but the children play without care.
Aired: 10/18/1968
Lovely telepath Miranda is aide to Ambassador Kollos, in a box to stop insanity when humans see Medusans. She rejects Larry, a designer of Enterprise, and senses murderous intent nearby.
Aired: 10/25/1968
As punishment for ignoring their warning and trespassing on their planet, the Melkot condemn Capt. Kirk and his landing party to the losing side of a surreal recreation of the 1881 historic gunfight at the OK Corral.
Aired: 11/1/1968
Both humans and Klingons have been lured to a planet by a formless entity that feeds on hatred and has set about to fashion them into a permanent food supply for itself.
Aired: 11/8/1968
The Enterprise discovers an apparent asteroid that is on a collision course with a planet is actually an ancient populated generation ship.
Aired: 11/15/1968
With Capt. Kirk and the derelict USS Defiant apparently lost, the Enterprise grapples with an insanity causing plague and an attack by the Tholians.
Aired: 11/22/1968
After Dr. McCoy helps the leader of a planet populated by people with powerful psionic abilities, they decide to force him to stay by torturing his comrades until he submits.
Aired: 11/29/1968
A group of aliens who exist in a state of incredible acceleration invade the Enterprise and abduct Capt. Kirk.
Aired: 12/6/1968
Trapped in an alien laboratory, Kirk, Spock and McCoy meet an empath and are involved in a series of experiments.
Aired: 12/20/1968
While transporting an arrogant, demanding princess for a political marriage, Captain Kirk must cope both with her biochemical ability to force him to love her, as well as sabotage on his ship.
Aired: 1/3/1969
Kirk and Spock are taken prisoners by a former starship captain named Garth, who now resides at, and has taken over, a high security asylum for the criminally insane.
Aired: 1/10/1969
The Enterprise encounters two duo-chromatic and mutually belligerent aliens who put the ship in the middle of their old conflict.
Aired: 1/17/1969
Kirk beams down to the planet Gideon and appears to find himself trapped on a deserted Enterprise. Spock on the real Enterprise must use his diplomatic skills to deal with the uncooperative inhabitants of Gideon and find the Captain.
Aired: 1/24/1969
After the Enterprise landing party beams down to investigate a geologically interesting planet, their ship is hurled across the galaxy. Kirk and company find a deserted outpost guarded by the deadly image of a beautiful woman.
Aired: 1/31/1969
A mysterious, twinkling mass of sapient energy ravages an important archive and Scotty's new girlfriend may be linked to it.
Aired: 2/14/1969
On a planet, looking for an urgent medicinal cure, Kirk, Spock and McCoy come across a dignified recluse living privately but in splendor with his sheltered ward and a very protective robot servant.
Aired: 2/21/1969
A group of idealistic hippies, led by an irrational leader, come aboard the U.S.S. Enterprise.
Aired: 2/28/1969
Kirk and Spock are caught up in a revolution on a planet where intellectuals and artists live on a utopian city in the sky while the rest of the population toils in mines on the barren surface below.
Aired: 3/7/1969
Kirk, Spock, Abraham Lincoln and Vulcan legend Surak are pitted in battle against notorious villains from history for the purpose of helping a conscious rock creature's understanding of a concept he does not understand, "good vs. evil".
Aired: 3/14/1969
When Kirk, Spock and McCoy investigate the disappearance of a doomed planet's population, they find themselves trapped in different periods of that world's past.
Aired: 6/3/1969
Captain Kirk's insane ex-lover Dr. Janice Lester forcibly switches bodies with him in order to take command of the Enterprise.
