Aired: 9/8/1973
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.
Aired: 9/15/1973
Stardate: 5373.4 Spock travels back in time to prevent his death as a young Vulcan.
Aired: 9/22/1973
Stardate: 5371.3 The crew of the Enterprise races to find a way to stop a cloud from destroying inhabited planets.
Aired: 9/29/1973
Stardate: 5483.7 Female crew members must take over the Enterprise when the men are incapacitated by a race of sirens.
Aired: 10/6/1973
Stardate: 5392.4 Cyrano Jones introduces tribbles that cannot reproduce.
Aired: 10/13/1973
Stardate: 5143.3 The Enterprise finds a long-lost explorer.
Aired: 10/20/1973
Stardate: 5554.4 A race of plant people, and their master, have a plan to force peace onto the galaxy.
Aired: 10/27/1973
Stardate: 1254.4 At the center of the galaxy, the Enterprise discovers a race of powerful aliens.
Aired: 11/3/1973
Stardate: 5591.2 Kirk returns to the "shore leave" planet, but it's not as peaceful as it was when they last saw it.
Aired: 11/10/1973
Stardate: 4978.5 Space con artist Harry Mudd returns, selling a fake love potion.
Aired: 11/17/1973
Stardate: 5577.3 The Enterprise crew begins to shrink after radiation exposure.
Aired: 11/24/1973
Stardate: 5267.6 The Enterprise crew must work with Klingons to escape from a pocket universe.
Aired: 12/1/1973
Stardate: 5499.9 While exploring the planet Argo, Kirk and Spock are turned into water breathers.
Aired: 12/15/1973
Stardate: 4187.3 Spock, Sulu, and Uhura discover a time capsule from an ancient and technologically advanced race. However, it draws some unwanted attention.
Aired: 1/5/1974
Stardate: 5501.2 Telepathic aliens put Kirk, Spock and McCoy in a zoo.
Aired: 1/12/1974
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.
