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Season guide

Star Trek: Season 1

29 episodes Premiered Sep 8, 1966 Updated Jul 18, 2026
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Episodes

S1·E1

The Man Trap

Sep 8, 1966 · 50 min

Doctor Leonard “Bones” McCoy meets a former girlfriend when the enterprise brings supplies to a remote archaeological survey group. Still attractive to McCoy, the woman's current a

S1·E2

Charlie X

Sep 15, 1966 · 51 min

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

S1·E3

Where No Man Has Gone Before

Sep 22, 1966 · 51 min

When Enterprise encounters a Force Field at the edge of the Galaxy, one of the crew members psionic abilities are accelerated to God like proportions causing him to become a powerf

S1·E4

The Naked Time

Sep 29, 1966 · 51 min

An alien virus strips the enterprise crew of their inhibitions, causing chaos as each crew member is overcome by hidden emotions. Meanwhile, the Enterprise is being pulled inexorab

S1·E5

The Enemy Within

Oct 6, 1966 · 50 min

Split by a transporter malfunction into two beings with very different personalities, the resulting twin Captain Kirk proves that neither a purely evil nor a sweetly good captain c

S1·E6

Mudd's Women

Oct 13, 1966 · 50 min

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 suito

S1·E7

What Are Little Girls Made Of?

Oct 20, 1966 · 50 min

Helping nurse Christine Chapel search for her fiancé, the Enterprise finds a detached Dr. Korby working on a plan to create Android duplicates of key figures, beginning with James

S1·E8

Miri

Oct 27, 1966 · 50 min

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,

S1·E9

Dagger of the Mind

Nov 3, 1966 · 50 min

When a wild eyed maniac escaping from the Tantalus Penal Colony turns out to be one of the psychiatric staff, Kirk investigates the institution and discovers a chilling exercise in

S1·E10

The Corbomite Maneuver

Nov 10, 1966 · 50 min

Threatened by the sinister captain of a powerful alien vessel, Kirk claims that the Enterprise carries a powerful explosive which will destroy both ships. The move produces unexpec

S1·E11

The Menagerie (1)

Nov 17, 1966 · 49 min

Apparently summoned to Star Base 11, Kirk, Spock and McCoy visit a former Enterprise Commander, the paralyzed and horribly disfigured Christopher Pike. Uncharacteristically, Spock

S1·E12

The Menagerie (2)

Nov 24, 1966 · 50 min

Spock's court martial reveals the actions of Captain Pike on his previous visit to Talos IV, where the powerful Talosians tried to persuade Pike to breed with women provided for th

S1·E13

The Conscience of the King

Dec 8, 1966 · 50 min

Contacted by one of the other two witnesses to the crimes of mass murderer “Kodos the Executioner,” Kirk is persuaded that the criminal may be disguising himself as an actor in a

S1·E14

Balance of Terror

Dec 15, 1966 · 50 min

Despite the earlier Romulan war, the Romulans have never been seen in person. The Enterprise, in pursuit of a Romulan aggressor, makes a discovery that causes suspicion about a sen

S1·E15

Shore Leave

Dec 29, 1966 · 50 min

When McCoy sees the White Rabbit from Alice in Wonderland, the crew begins to realize that the planet they are visiting seems to have the dangerous power to turn any thought into r

S1·E16

The Galileo Seven

Jan 5, 1967 · 50 min

Crash landing on a planet populated by hostile giants, the 7-man crew of the shuttlecraft Galileo find themselves unable to communicate with the enterprise or to escape the planet'

S1·E17

The Squire of Gothos

Jan 12, 1967 · 50 min

Encountering an uncharted planet in an empty region of space, Kirk and his crew are entertained by Trelane, a playful being who lacks the self-control to wield his great psionic po

S1·E18

Arena

Jan 19, 1967 · 51 min

With both their ships held captive by powerful beings, Kirk and the captain of the alien vessel are placed on an asteroid to fight for their lives and the lives of their crews.

S1·E19

Tomorrow Is Yesterday

Jan 26, 1967 · 50 min

In a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.

S1·E20

Court Martial

Feb 2, 1967 · 50 min

Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.

S1·E21

The Return of the Archons

Feb 9, 1967 · 50 min

The Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.

S1·E22

Space Seed

Feb 16, 1967 · 50 min

The Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.

S1·E23

A Taste of Armageddon

Feb 23, 1967 · 50 min

The Enterprise arrives at a planet to establish diplomatic relations and finds itself in the middle of a "peaceful" war that threatens to destroy the ship.

S1·E24

This Side of Paradise

Mar 2, 1967 · 50 min

The Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.

S1·E25

The Devil in the Dark

Mar 9, 1967 · 50 min

Kirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.

S1·E26

Errand of Mercy

Mar 23, 1967 · 50 min

The Federation and the Klingon Empire teeter on the brink of war as Kirk investigates Organia, a humble planet, inhabited by pacifists, that is unwittingly caught in the middle.

S1·E27

The Alternative Factor

Mar 30, 1967 · 51 min

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

S1·E28

The City on the Edge of Forever

Apr 6, 1967 · 50 min

Kirk and Spock must travel into the past in order to correct a change that will alter history.

S1·E29

Operation: Annihilate!

Apr 13, 1967 · 50 min

Kirk and the Enterprise must combat parasitic aliens threatening the lives of millions.