1. Beyond the Farthest Star

7.214

. 8 September 1973. 24 min

Stardate: 5521.3 In orbit around a dead star, the Enterprise comes across a huge starship inhabited by a parasitic life form that threatens the entire ship.

2. Yesteryear

7.917

. 15 September 1973. 24 min

Stardate: 5373.4 Spock travels back in time to prevent his death as a young Vulcan.

3. One of Our Planets Is Missing

7.111

. 22 September 1973. 24 min

Stardate: 5371.3 The crew of the Enterprise races to find a way to stop a cloud from destroying inhabited planets.

4. The Lorelei Signal

7

. 29 September 1973. 24 min

Stardate: 5483.7 Female crew members must take over the Enterprise when the men are incapacitated by a race of sirens.

5. More Tribbles, More Troubles

7.7

. 6 October 1973. 24 min

Stardate: 5392.4 Cyrano Jones introduces tribbles that cannot reproduce.

6. The Survivor

7.2

. 13 October 1973. 24 min

Stardate: 5143.3 The Enterprise finds a long-lost explorer.

7. The Infinite Vulcan

6.7

. 20 October 1973. 24 min

Stardate: 5554.4 A race of plant people, and their master, have a plan to force peace onto the galaxy.

8. The Magicks of Megas-tu

7.2

. 27 October 1973. 24 min

Stardate: 1254.4 At the center of the galaxy, the Enterprise discovers a race of powerful aliens.

9. Once Upon a Planet

6.8

. 3 November 1973. 24 min

Stardate: 5591.2 Kirk returns to the "shore leave" planet, but it's not as peaceful as it was when they last saw it.

10. Mudd's Passion

7.2

. 10 November 1973. 24 min

Stardate: 4978.5 Space con artist Harry Mudd returns, selling a fake love potion.

11. The Terratin Incident

7.2

. 17 November 1973. 24 min

Stardate: 5577.3 The Enterprise crew begins to shrink after radiation exposure.

12. The Time Trap

7

. 24 November 1973. 24 min

Stardate: 5267.6 The Enterprise crew must work with Klingons to escape from a pocket universe.

13. The Ambergris Element

7.5

. 1 December 1973. 24 min

Stardate: 5499.9 While exploring the planet Argo, Kirk and Spock are turned into water breathers.

14. The Slaver Weapon

7

. 15 December 1973. 24 min

Stardate: 4187.3 Spock, Sulu, and Uhura discover a time capsule from an ancient and technologically advanced race. However, it draws some unwanted attention.

15. The Eye of the Beholder

8.2

. 5 January 1974. 24 min

Stardate: 5501.2 Telepathic aliens put Kirk, Spock and McCoy in a zoo.

16. The Jihad

6.8

. 12 January 1974. 24 min

Stardate: 5683.1 Kirk and Spock are recruited for a heist to recover a stolen relic, which if not recovered could spark an galactic jihad.