The Enterprise finds a deserted starship orbiting a dead star.
Spock travels back in time to prevent his death as a young Vulcan.
A mysterious cloud destroys inhabited planets.
A race of beautiful women remains immortal by stealing the life force of men.
Cyrano Jones introduces tribbles that cannot reproduce.
The Enterprise finds a long-lost explorer (Ted Knight).
A mad scientist has developed a race of intelligent plant life.
At the center of the galaxy, the Enterprise discovers a race of powerful aliens.
A planet is less peaceful than Kirk remembers it to be.
Space con artist Harry Mudd returns, selling a fake love potion.
The Enterprise crew begins to shrink after radiation exposure.
The Enterprise crew must work with Klingons to escape from a pocket universe.
Kirk and Spock transform while exploring the planet Argo.
Spock, Sulu and Uhura are taken captive.
Telepathic aliens put Kirk, Spock and McCoy in a zoo.
Kirk leads a group trying to recover a stolen religious relic.