On a distant planet, Kirk, Spock and McCoy find a scientific team dead, and their children who, unknown to the crew, have great powers at their disposal.

The Enterprise picks up a group of space "hippies" looking for Eden.

Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.

An alien female beams aboard the ship and, after incapacitating the rest of the crew, surgically removes Spock's brain. Kirk and the crew have just hours to locate and replace it before Spock's body dies.

Captain Kirk must find the cure to a deadly disease and put an end to another Starfleet captain's cultural interference.

Two powerful aliens threaten the well-being of the Enterprise and her crew.

Strange incorporeal aliens threaten the Memory Alpha station and the Enterprise.

The crew of the Enterprise visits a mysterious paradisical planet controlled by a computer that is served by the local inhabitants.

The crew of the Enterprise encounters an ageless and sadistic race of humanoids with the power of telekinesis and who claim to have organized their society around Ancient Greek ideals.

While visiting a doomed planet, the landing party is subject to torturous experiments by powerful aliens.

A race of overpopulated aliens abduct Captain Kirk to solve their problem.

Kirk, McCoy, and Sulu are stranded on a barren planet where a mysterious woman attempts to kill them one at a time, while the Enterprise must travel halfway across the galaxy to rescue them.

Aliens force Captain Kirk and First Officer Spock to join forces with "Abraham Lincoln" and "Surak" to battle villains in a contest of good vs. evil.

Rescuing the crew of a ship from an asteroid belt, the Enterprise plays host to conman extraordinaire, the cunning Harry Mudd and his cargo: three beautiful women looking for suitors.

The crew of the Enterprise become entangled in a planet's tribal power struggle.

An alien device on a primitive planet erases Captain Kirk's memory, and he begins a new life with the planet's indigenous people.

The crew of the Enterprise discovers Klingon interference in the development of a formerly peaceful planet and is forced to help maintain a balance of power.

The Enterprise is in danger when Janice Lester, one of Kirk's former lovers, steals his body.

On a planet populated by children whose aging process has been slowed artificially. Kirk’s landing party members contract a virus that kills adults. Despite their violent attacks, Kirk is determined to help the children.

The Enterprise travels with an alien ambassador whose appearance induces madness.

Captain Kirk faces off with a demented shape-shifting starship captain determined to control the universe.

Raised from boyhood by non-corporeal beings, 17 year old Charles Evans is picked up and transferred to the Enterprise. On board the ship, the teenager proves dangerously unable to wield his enormous psionic powers with maturity.

Captain Kirk and his companions are abducted into slavery and trained to fight as gladiators for the gambling entertainment of three disembodied beings.

The Enterprise crew investigates the disappearance of a ship's crew on a planet that is a modern version of the Roman Empire.

The USS Enterprise ferries a spoiled princess whose betrothal to a royal Troyian is hoped will bring peace to a star system at war.