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

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

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

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

Cyrano Jones introduces tribbles that cannot reproduce.

The Enterprise finds a long-lost explorer.

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

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

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.

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

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

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

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