Original Star Trek Episode List

Season One

21. The Return of the Archons

Airdate: 9 Feb 1967
Stardate: 3156.2
The Return of the Archons The Enterprise journeys to the planet Beta III to investigate the disappearance of the U.S.S. Archon which went missing a century ago. A member of the landing party returns in an oddly blissful state, so Kirk and another landing party beams down to study the situation more closely. It appears that a mysterious being, Landru, has control over the populace.

22. Space Seed

Airdate: 16 Feb 1967
Stardate: 3141.9
Space Seed The Enterprise encounters a spaceship containing genetically enhanced humans from Earth's past lying in a state of suspended animation. When he is revived, the spaceship's leader, Khan, attempts to take over the Enterprise.

23. A Taste of Armageddon

Airdate: 23 Feb 1967
Stardate: 3192.1
A Taste of Armageddon On a diplomatic mission, Kirk and Spock beam down to the planet Eminiar and learn that it has been at war with the neighbouring planet, Vendikar, for 500 years. However, no sign of damage can be found. They learn that war here is waged by computer simulation, and that the Enterprise and crew have been marked for execution.

24. This Side of Paradise

Airdate: 2 Mar 1967
Stardate: 3417.3
This Side of Paradise The Enterprise is ordered to Omicron Ceti III to evacuate all the colonists, who are at danger from deadly Berthold rays. However, McKoy finds that they seem to be all in perfect health and have no desire to leave their home. Just what is keeping them so healthy?

25. The Devil in the Dark

Airdate: 9 Mar 1967
Stardate: 3196.1
The Devil in the Dark The Janus 6 mining colony is being terrorised by a mysterious monster that is killing men in the tunnels. Spock and Kirk investigate why the monster is acting the way it is, with Spock using the dangerous technique of the Vulcan mind-meld on one of the creatures.

26. Errand of Mercy

Airdate: 23 Mar 1967
Stardate: 3198.4
Errand of Mercy The Enterprise is ordered to protect the peaceful planet Organia when peace negotiations break down between the Federation and the Klingon Empire. Kirk and Spock beam down to warn the Organians about the Klingons, but when a Klingon fleet arrive, the Enterprise has to leave abandoning the two on the planet.

27. The Alternative Factor

Airdate: 30 Mar 1967
Stardate: 3087.6
The Alternative Factor While scanning an unchartered planet, Spock announces that a violent unknown force has caused a 'blinking out' of everything nearby. Resuming the scan, life is found on the planet where none was found before. A landing party finds a man named Lazarus, who tells them that he is locked in a struggle with an anti-version of himself.

28. The City on the Edge of Forever

Airdate: 6 Apr 1967
Stardate: 3134.0
The City on the Edge of Forever McKoy accidentally injects himself with Cordrazine, which brings on a paranoid insanity. He beams himself down to the planet they are orbiting and escapes through a time portal. Somehow, he changes the past obliterating the Enterprise. Kirk and Spock must travel through the time portal and intercept McKoy to undo the damage that he has done.

29. Operation: Annihilate!

Airdate: 13 Apr 1967
Stardate: 3287.2
Operation: Annihilate The Enterprise investigates an epidemic that seems to be travelling in a straight line engulfing all planets in its path. The next planet it will reach is home to Kirk's brother Sam and his family. The Enterprise arrives too late for Sam, however. Investigating further they find that small flying jellyfish-like entities are to blame.