When the Enterprise’s first captain travels aboard the ship to his retirement ceremony, the crew is pulled into a universe where time works backwards and everyone grows younger.

(more…)

An ancient alien astronaut who visited Earth and was worshipped as a god takes Kirk as a specimen for a collection of species he’s influenced.

(more…)

Dr. McCoy is charged with causing a plague nineteen years earlier, and the Enterprise crew contracts the illness while looking for evidence to use in his defense.

(more…)

After Romulans chase the Enterprise through an energy cloud, the ship is plagued by a series of silly pranks.

(more…)

When visiting Commander Bem of Pandro is imprisoned by aliens, Kirk is threatened by a local god during a rescue attempt.

(more…)

Spock contracts an illness that is fatal to Vulcans, but the treatment is stolen by pirates looking for dilithium.

(more…)

An ancient race of spacefarers asks Kirk and Spock to help them prevent a holy war by retrieving the soul of a dead peacemaker.

(more…)

Kirk, Spock, and McCoy are imprisoned in a zoo by slug-like creatures who do not believe the Enterprise crewmembers are intelligent.

(more…)

Spock, Uhura and Sulu are captured by the Kzinti, a dangerous enemy trying to collect the ancient technology of the Slavers.

(more…)

On a planet covered almost completely by oceans, Kirk and Spock are turned into water-breathing creatures from a species distrustful of air-breathers.

(more…)

The Enterprise is trapped in the Delta Triangle with a Klingon ship, where they find other vessels and their crews all living in harmony.

(more…)

Everyone on the Enterprise begins to shrink after being hit by a mysterious energy surge that shatters the ship’s dilithium crystals.

(more…)

No one is more surprised than Harry Mudd when the love potion he’s been selling causes Spock to fall in love with Christine Chapel.

(more…)

The crew returns to the “Shore Leave” planet, only to find that the computer, resenting its role as a servant, has made fantasy run amok.

(more…)

The Enterprise enters the center of the galaxy, where magic has more power than technology.

(more…)