In orbit around a dead star, the Enterprise comes across a huge starship inhabited by a parasitic life form that threatens the entire ship.

24 min . 1973-09-08

Spock travels back in time to prevent his death as a young Vulcan.

24 min . 1973-09-15

The crew of the Enterprise races to find a way to stop a cloud from destroying inhabited planets.

24 min . 1973-09-22

Female crew members must take over the Enterprise when the men are incapacitated by a race of sirens.

24 min . 1973-09-29

Cyrano Jones introduces tribbles that cannot reproduce.

24 min . 1973-10-06

The Enterprise finds a long-lost explorer.

24 min . 1973-10-13

A race of plant people, and their master, have a plan to force peace onto the galaxy.

24 min . 1973-10-20

At the center of the galaxy, the Enterprise discovers a race of powerful aliens.

24 min . 1973-10-27

Kirk returns to the "shore leave" planet, but it's not as peaceful as it was when they last saw it.

24 min . 1973-11-03

Space con artist Harry Mudd returns, selling a fake love potion.

24 min . 1973-11-10

The Enterprise crew begins to shrink after radiation exposure.

24 min . 1973-11-17

The Enterprise crew must work with Klingons to escape from a pocket universe.

24 min . 1973-11-24

While exploring the planet Argo, Kirk and Spock are turned into water breathers.

24 min . 1973-12-01

Spock, Sulu, and Uhura discover a time capsule from an ancient and technologically advanced race. However, it draws some unwanted attention.

24 min . 1973-12-15

Telepathic aliens put Kirk, Spock and McCoy in a zoo.

24 min . 1974-01-05

Kirk and Spock are recruited for a heist to recover a stolen relic, which if not recovered could spark an galactic jihad.

24 min . 1974-01-12