Pilot. The Cage  

Production Code: 001

Captain Pike of the Enterprise is kidnapped by aliens who have mastered illusion.

1. The Man Trap  

First aired: 9/8/1966    Production Code: 6149-06

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.

2. Charlie X  

First aired: 9/15/1966    Production Code: 6149-08

The Enterprise's newest passenger is a young man - what they don't know is that he has the power to make anything he thinks of happen.

3. Where No Man Has Gone Before  

First aired: 9/22/1966    Production Code: 6149-02

While exploring the edge of the galaxy, the Enterprise encounters an energy barrier that gives two crewmen godlike powers.

4. The Naked Time  

First aired: 9/29/1966    Production Code: 6149-07

A strange alien substance causes the crew to act out their deepest inhibitions, while the ship plummets out of orbit.

5. The Enemy Within  

First aired: 10/6/1966    Production Code: 6149-05

A transporter malfunction causes Captain Kirk to split into his "good" and "evil" selves, and a landing party will freeze to death if the crew is unable to find a way to merge the two Kirks back together.

6. Mudd's Women  

First aired: 10/13/1966    Production Code: 6149-04

The Enterprise picks up a intergalactic conman, Harry Mudd, and three incredibly beautiful women who harbor a dark secret.

7. What Are Little Girls Made Of?  

First aired: 10/20/1966    Production Code: 6149-10

Nurse Christine Chapel is reunited with her old fiance on Exo III, but the scientist has plans for Captain Kirk and the Federation.

8. Miri  

First aired: 10/27/1966    Production Code: 6149-12

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.

9. Dagger of the Mind  

First aired: 11/3/1966    Production Code: 6149-11

Kirk investigates an experimental facility for holding prisoners and finds a sinister scheme.

10. The Corbomite Maneuver  

First aired: 11/10/1966    Production Code: 6149-03

The Enterprise encounters a vast alien ship that sets out to test them.

11. The Menagerie (1)  

First aired: 11/17/1966    Production Code: 6149-16A

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.

12. The Menagerie (2)  

First aired: 11/24/1966    Production Code: 6149-16B

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.

13. The Conscience of the King  

First aired: 12/8/1966    Production Code: 6149-13

Kirk is one of the last survivors who can identify a mass killer, who lurks among a Shakespearean troupe aboard the Enterprise.

14. Balance of Terror  

First aired: 12/15/1966    Production Code: 6149-09

Kirk pits the Enterprise against an invisible spaceship testing the Federation's defenses.

15. Shore Leave  

First aired: 12/29/1966    Production Code: 6149-17

The Enterprise crew take shore leave on a peaceful, pastoral planet... where their dreams and fantasies come to life.

16. The Galileo Seven  

First aired: 1/5/1967    Production Code: 6149-14

Spock commands a stranded away team when their shuttlecraft is stranded on a planet with hostile natives.

17. The Squire of Gothos  

First aired: 1/12/1967    Production Code: 6149-18

The Enterprise finds itself at the mercy of a seemingly omnipotent being who fancies himself a 18th century Englishman.

18. Arena  

First aired: 1/19/1967    Production Code: 6149-19

When a mysterious alien race destroys an Earth colony, the Enterprise pursues. However, powerful aliens soon immobilize both ships and force Kirk and the alien captain to fight each other to the death.

19. Tomorrow is Yesterday  

First aired: 1/26/1967    Production Code: 6149-21

The Enterprise narrowly avoid a collision with a black hole and is thrown back to Earth in the 20th century, where they must find a way back and erase any trace of their presence. Matters become complicated when they rescue an Air Force pilot and cannot return him without changing history...but if he disappears that will change history as well.