Episodes: 29 / 29
E1Sep 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 appearance hides a dark and deadly secret.
E2Sep 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 wield his enormous psionic powers with maturity.
E3Sep 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 powerful murderous being.
E4Sep 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 inexorably into a nearby planet's gravity well.
E5Oct 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 can survive without the missing half.
E6Oct 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 suitors.
E7Oct 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 Kirk.
E8Oct 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, Kirk is determined to help the children.
E9Nov 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 mind control.
E10Nov 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 unexpected actions from the alien adversary.
E11Nov 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 commandeers the Enterprise, then turns himself in for court martial.
E12Nov 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 the purpose.
E13Dec 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 traveling theatrical troupe.
E14Dec 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 senior crew member.
E15Dec 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 reality.
E16Jan 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's atmosphere.
E17Jan 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 powers with discipline.
E18Jan 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.
E19Jan 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.
E20Feb 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.
E21Feb 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.
E22Feb 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.
E23Feb 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.
E24Mar 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.
E25Mar 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.
E26Mar 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.
E27Mar 30, 1967 · 51 min
Kirk and Spock encounter an alien named Lazarus who claims to be from an anti-matter universe.
E28Apr 6, 1967 · 50 min
Kirk and Spock must travel into the past in order to correct a change that will alter history.
E29Apr 13, 1967 · 50 min
Kirk and the Enterprise must combat parasitic aliens threatening the lives of millions.
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