Captain Pike is captivated by the Talosians and put into a world of illusions.

When the Enterprise is attacked by a vessel of the First Federation, Kirk has to put all his eggs in one basket.

Harry Mudd is beamed to the Enterprise, accompanied by three beautiful women who are intended to become the wifes of miners.

A transporter accident doubles Captain Kirk, who now exists twice - as a "good Kirk" and a "bad Kirk".

McCoy meets his former love which turns out to be an alien being nourishing from human body salts.

A landing party is infected with a virus that soon makes the entire crew let out their latent attitudes and emotions.

An orphan comes aboard, causing severe damage with his mental abilities he learned from the Thasians.

Outposts along the Neutral Zone are attacked by the Romulans, which look exactly like the Vulcans.

Visiting Exo II, the crew discovers that Christine Chapel's ex-fiancee, Dr. Korby, has learned to produce perfect androids.

In the penal colony Tantalus, a new decive originally developed to heal mental disorders is used to control the hostages through violence.

A landing party beams to a planet where all adults have been killed by a virus and only the children survived.

When a group of actors performs a play aboard the Enterprise, a dark secret is revelead that concerns both Kirk and the leading actor Karidian.

The Galileo is forced to land on an inhospitable planet where the shuttle crew has to fight for survival.

On Starbase 12, Kirk is accused of having negliciently caused the death of Ben Finney during an ion storm.

To help his crippled former captain to live a normal life, Spock disobeys all orders, taking the Enterprise to Talos IV.

The shore leave on an idyllic planet gets problematic when the wishes of the crew become reality.

A seemingly uninhabited planet emerges as the playground of a omnipotent being with a childlike character.

Kirk and a Gorn captain are brought to a planet where they are forced to fight against each  other until one of them is killed.

The crew discovers a man whose counterpart from a parallel dimension pursues the annihilation of the universe.

The Enterprise is hurled back in time to the Earth of the 1960s, where  an Air Force Pilot mistakes the ship for an UFO.

Kirk, Spock and McCoy encounter a planet where individual and autonomous actions are porohibited by the sovereign.

On Eminiar VII, the crew of the Enterprise becomes involved in a computer simulated, but still deadly war.

After supermen frozen and banished from Earth centuries ago have been revived, they take over the Enterprise.

Alien spores make humans on a certain planet live a paradisic, blissful, but unsubstantial life.

A creature that has killed more than 50 miners on Janus turns out to be a mother protecting her unborn offsprings.

The open war between the Federation and the Klingons is stopped by the omnipotent Organians.

To rescue McCoy, Kirk and Spock return to the 1930s where the captain has to sacrifice his love to restore the future.

Investigating on the outbreak of mass insanity on Deneva, Spock is infected by an alien parasite.