The Original Series

Season One

The Man Trap

In the form of archeologist Robert Crater, a creature that needs salt to survive beams aboard the Enterprise and begins killing crew members for the salt in their bodies.

Charlie X

Seventeen year old Charlie Evans, last survivor of a colony on Thasus, is rescued by the Enterprise and begins causing trouble with his psychic powers.

Where No Man Has Gone Before (Second Pilot)

The Enterprise encounters a force field at the edge of the galaxythat intensifies the latent psychic powers of Lt. Commander Gary Mitchell and Dr. Elizabeth Dehner.

The Naked Time

On the planet Psi 2000, a rescue team picks up a virus that removes the crew members' inhibitions, causing chaos on the Enterprise.

The Enemy Within

A transporter malfunction splits Kirk into his two inate halves -- one good but weak-willed and the other evil.

Mudd's Women

Interstellar smuggler Harry Mudd is brought aboard the Enterprise with three women who get their beauty from an illegal drug given to them by Mudd.

What Are Little Girls Made Of?

In search of exobiologist Dr. Roger Kirby, Nurse Chapel's ex-fiancee, the Enterprise finds that he has constructed androids and given himself an android body in a plan to replace key Federation leaders with android duplicates.

Miri

The Enterprise encounters an Earth-like planet where a virus has killed all of the adults by causing them to age rapidly, while the aging process in children is slowed.

Dagger of the Mind

A maniac who escapes from the Tantalus V penal colony uses a brainwashing device in an attempt to gain control of the Enterprise.

The Corbomite Maneuver

The Enterprise encounters the evil-looking Balok and his huge spherical ship, the Fesarius, but later discover that Balok is really a small, friendly alien who has been testing the Enterprise crew.

The Menagerie (Part 1)

Spock commandeers the Enterprise to take Captain Christopher Pike to the off-limits planet Talos IV.

The Menagerie (Part 2)

Enroute to Talos IV with Captain Pike, Spock faces a court-martial, during which the story of the first contact with the Talosians (The Cage) is revealed.

The Conscience of the King

The Enterprise crew discovers that the leader of a traveling theater group is really Kodos the Executioner, who murdered most of the population of Tarsus IV 20 years earlier.

Balance of Terror

A Romulan Bird of Prey attacks the Federation outposts near the Neutral Zone, starting a cat-and-mouse confrontation with the Enterprise.

Shore Leave

The Enterprise crew takes shore leave on a planet where their thoughts are brought to life by underground machinery of an advanced race.

The Galileo Seven

The shuttlecraft Galileo and its seven occupants crash-land on a hostile planet, and Spock must assume command to give them a chance at being rescued.

The Squire of Gothos

Four Enterprise crew members are kidnapped by Trelane, an arrogant, impetuous alien who turns out to be a child using the crew members as play things.

Arena

After chasing a Gorn ship into an uncharted sector of space, Kirk and the Gorn commander are transported to a desert planet, where they are forced to duel to the death.

Tomorrow Is Yesterday

The Enterprise is thrown back in time to 20th Century Earth after a close encounter with a black star, and is reported as a UFO by an Air Force pilot.

Court-Martial

Kirk is charged with negligence in the death of an Enterprise creman, but is later acquitted when Spock discovers that the crewman isn't really dead.

The Return of the Archons

The Enterprise crew beams down to a planet where the zombie-like inhabitants are controlled by a super computer known as Landru.

Space Seed

The Enterprise finds the S.S. Botany Bay, a 1990's sleeper ship carrying a group of genetically bred supermen led by Khan Noonian Singh.

A Taste of Armageddon

After the Enterprise is declared a victim of an interplanetary war fought only in the memory banks of opposing computers, Kirk and Spock force the warring planets to face the destruction of real war or settle their dispute.

This Side of Paradise

All of the Enterprise crew, except Captain Kirk, are exposed to spores that induce a feeling of euphoria and a desire to remain on the planet.

The Devil in the Dark

A mining colony on Janus VI is faced with death and destruction caused by a rock-like creature, the Horta, which turns out to be a mother trying to protect her eggs from the miners' equipment.< P>

Errand of Mercy

The Organians intervene in a conflict between the Federation and the Klingons by imposing a peace treaty that will be enforced by the power of the Organians' minds.

The Alternative Factor

The Enterprise finds Lazarus on a deserted planet, and soon discovers that he is in a life-and-death struggle with an evil duplicate from a parallel anti-matter universe.

The City on the Edge of Forever

After an accidental overdose of the stimulant cordazine, Dr. McCoy jumps through a time portal on a deserted planet and ends up on Earth in the 1930's.

Operation: Annihilate

While investigating the death of Kirk's brother and other colonists on Deneva, Spock is attacked by a flying creature that attaches itself to its victim's nervous system.