Season 1
29 episodes · Sep 8, 1966
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S1E1The Man Trap
Sep 8, 196650mDoctor 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 appearance hides a dark and deadly secret.
S1E2Charlie X
Sep 15, 196651mRaised 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.
S1E3Where No Man Has Gone Before
Sep 22, 196651mWhen 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 powerful murderous being.
S1E4The Naked Time
Sep 29, 196651mAn 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 inexorably into a nearby planet's gravity well.
S1E5The Enemy Within
Oct 6, 196650mSplit 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 can survive without the missing half.
S1E6Mudd's Women
Oct 13, 196650mRescuing 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.
S1E7What Are Little Girls Made Of?
Oct 20, 196650mHelping 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 Kirk.
S1E8Miri
Oct 27, 196650mOn 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.
S1E9Dagger of the Mind
Nov 3, 196650mWhen 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 mind control.
S1E10The Corbomite Maneuver
Nov 10, 196650mThreatened 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 unexpected actions from the alien adversary.
S1E11The Menagerie (1)
Nov 17, 196649mApparently summoned to Star Base 11, Kirk, Spock and McCoy visit a former Enterprise Commander, the paralyzed and horribly disfigured Christopher Pike. Uncharacteristically, Spock commandeers the Enterprise, then turns himself in for court martial.
S1E12The Menagerie (2)
Nov 24, 196650mSpock'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 the purpose.
S1E13The Conscience of the King
Dec 8, 196650mContacted 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 traveling theatrical troupe.
S1E14Balance of Terror
Dec 15, 196650mDespite 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 senior crew member.
S1E15Shore Leave
Dec 29, 196650mWhen 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 reality.
S1E16The Galileo Seven
Jan 5, 196750mCrash 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's atmosphere.
S1E17The Squire of Gothos
Jan 12, 196750mEncountering 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 powers with discipline.
S1E18Arena
Jan 19, 196751mWith 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.
S1E19Tomorrow Is Yesterday
Jan 26, 196750mIn a freak accident the Enterprise is sent back to 20th century Earth, and must find their way back without changing history.
S1E20Court Martial
Feb 2, 196750mCaptain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm.
S1E21The Return of the Archons
Feb 9, 196750mThe Enterprise encounters a seemingly peaceful civilization run by a "benevolent" being named Landru... who intends for them to join his people.
S1E22Space Seed
Feb 16, 196750mThe Enterprise picks up a crew of genetic supermen from the 20th century... and their leader, Khan, plans to create a new empire.
S1E23A Taste of Armageddon
Feb 23, 196750mThe 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.
S1E24This Side of Paradise
Mar 2, 196750mThe Enterprise crew try to rescue colonists from deadly radiation, but instead encounter strange alien spores that seem to offer paradise.
S1E25The Devil in the Dark
Mar 9, 196750mKirk investigates a series of grisly murders on a mining planet that are the work of a seemingly hostile alien creature.
S1E26Errand of Mercy
Mar 23, 196750mThe 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.
S1E27The Alternative Factor
Mar 30, 196751mKirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
S1E28The City on the Edge of Forever
Apr 6, 196750mKirk and Spock must travel into the past in order to correct a change that will alter history.
S1E29Operation: Annihilate!
Apr 13, 196750mKirk and the Enterprise must combat parasitic aliens threatening the lives of millions.