First aired September 8, 1966. The Enterprise is ravaged by a creature that sucks the salt from its victims' bodies, and that is capable of assuming any identity.
First aired September 15, 1966. A teenager, raised by aliens and possessing some of their unusual powers, proves incapable of adjusting to human society and emotions.
First aired September 22, 1966. In passing through an energy barrier at the edge of the galaxy, some Enterprise crew members find their ESP powers enormously heightened.
[Note: although this was the third episode aired, it was actually filmed before the others and was the 2nd pilot made for the show. The first, "The Cage" was later made into the two-part episode, "The Menagerie"]
First aired September 29, 1966. A strange malady strikes the crew of the Enterprise, causing them to succumb to their innermost desires.
First aired October 6, 1966. A transporter malfunction splits Kirk into two personalities, one brutal and incapable of control, the other gentle and incapable of command.
First aired October 13, 1966. Jack-of-all-illegal-trades Harry Mudd is transported aboard the Enterprise along with his cargo, three irresistibly beautiful women.
First aired October 20, 1966. Nurse Chapel's long-lost fiance turns up in control of a mechanism capable of producing android replicas of live beings.
First aired October 27, 1966. The landing party contracts a disease that strikes after puberty, while the children still alive on the planet refuse to let them contact the ship for help.
First aired November 3, 1966. A deranged escapee from a penal planet causes Kirk to investigate the psychiatric treatments being administered there.
First aired November 10, 1966. To stave off an attack by an alien vessel, Kirk concocts the now-famous "Corbomite" bluff.
First part aired November 17, 1966; second part aired November 24, 1966. Spock risks the death penalty by hijacking his old commander, Captain Pike, to Talos IV. Court-martial testimony (actually scenes taken from "The Cage", Star Trek's original pilot episode) recreates the story of Pike's earlier encounter with the Talosians.
First aired December 8, 1966. The star of a Shakespearean acting company may be the infamous "Kodos the Executioner".
First aired December 15, 1966. Kirk matches wits against a Romulan commander in the first encounter between the species to occur in several decades.
First aired December 29, 1966. The crew of the Enterprise takes shore leave on a planet where their every thought is immediately converted to reality.
First aired January 5, 1967. Spock finds himself in command of the shuttlecraft Galileo, stranded on a hostile planetoid.
First aired January 12, 1967. The crew of the Enterprise are made unwilling guests of the powerful but capricious General Trelane (retired).
First aired January 19, 1967. Kirk and a reptilian alien must duel to the death to determine whose ship will survive.
First aired January 26, 1967. The Enterprise is accidentally flung back to the year 1967, where they find they must take desperate measures in an attempt to avoid changing history.
First aired February 2, 1967. Kirk is placed on trial when the ship's record tapes show he committed an error that cost a man's life.
First aired February 9, 1967. An entire planet is under the total mental control of a mysterious being known as "Landru".
First aired February 16, 1967. The Enterprise runs across a "sleeper ship" full of supermen fleeing their defeat in the Eugenics Wars.
First aired February 23, 1967. The Enterprise and its crew are declared casualties in an interplanetary war entirely simulated by computers.
First aired March 2, 1967. Strange spores cause the entire crew of the Enterprise to mutiny and beam down to a planet where all work is done in unity and contentment.
First aired March 9, 1967. A mining operation is ravaged by a monster that dissolves men's bodies.
First aired March 23, 1967. Kirk and Spock, stranded on Organia, attempt to interfere with the Klingon occupation of the planet, despite the Organians' insistence upon the non-necessity of violence.
First aired March 30, 1967. A schizophrenic personality named Lazarus seems to be the key to an anomaly in the space-time fabric of the universe.
First aired April 6, 1967. McCoy, suffering from an overdose of cordrazine, vanishes through a time portal and somehow changes the past. Kirk and Spock follow in an effort to rectify whatever it is that McCoy has done.
First aired April 13, 1967. The Enterprise faces an onslaught by parasitic creatures that invade the nervous system to take control of their hosts.
First aired September 15, 1967. Spock is forced by the instinctive Vulcan mating cycle to return to his home planet and take a wife.
First aired September 22, 1967. The Enterprise is seized by a being claiming to be the god Apollo, who requires their worship to survive.
First aired September 29, 1967. Nomad, an ancient Earth probe, has combined with an alien probe to form an incredibly powerful mechanism that is determined to destroy all "imperfect" life forms.
First aired October 6, 1967. Kirk, McCoy, Scott, and Uhura are accidentally exchanged with their counterparts in a parallel universe, where instead of the Federation they find a violent, dictatorial Empire.
First aired October 13, 1967. The Enterprise finds itself under attack by Vaal, a machine that guides the actions and even the environment of a primitive populace.
First aired October 20, 1967. The starships Enterprise and Constellation battle an enormous machine that destroys planets and consumes them for fuel.
First aired October 27, 1967. Amidst an atmosphere of witches and dungeons, a pair of aliens use seemingly magical powers in an attempt to trick further scientific information from the people of the Enterprise.
First aired November 3, 1967. The Enterprise is forced to a planet populated by androids and ruled by their old nemesis, Harcourt Fenton Mudd.
First aired November 10, 1967. A shuttlecraft is forced down to a planet as company for a stranded spaceman, who has been kept young by a gaseous alien called the "Companion".
First aired November 17, 1967. Crisis piles atop crisis when the Enterprise is in charge of transporting a volatile cargo of Federation diplomats, including Spock's parents.
First aired December 8, 1967. Kirk is relieved of command when he and other officers contract a disease that results in senility and death by old age within days.
First aired December 15, 1967. Kirk disregards all other responsibilities in an effort to destroy a gaseous cloud that absorbs red corpuscles from human bodies.
First aired December 22, 1967. Scotty appears to be the only logical suspect in a bizarre series of murders.
First aired December 29, 1967. Kirk must put up with Federation bureaucrats and hordes of hungry tribbles while protecting a shipment of quadrotriticale (wheat) against Klingon sabotage.
First aired January 5, 1968. Kirk, Uhura, and Chekov are captured for use in gambling conflicts.
First aired January 12, 1968. Kirk must figure out a way to counteract the effects of an earlier expedition, which caused a planet's civilization to pattern itself after the Chicago mobs of the Twenties.
First aired January 19, 1968. A gigantic single-celled creature, which feeds on the energy necessary to our form of life, invades our galaxy.
First aired February 2, 1968. When the Klingons hasten the arms development of one faction on a hitherto peaceful planet, Kirk must arm the other side in order to maintain a balance of power.
First aired February 9, 1968. Highly advanced alien minds "borrow" bodies, including those of Kirk and Spock, in order to build permanent android bodies. One of them, however, does not wish to leave his borrowed body.
First aired February 16, 1968. A Federation historian ignores the Prime Directive and reshapes a planet's society along the lines of Nazi Germany.
First aired February 23, 1968. A group of aliens from the Andromeda galaxy commandeer the Enterprise to make the journey back home.
First aired March 1, 1968. Captain Tracy, believing he has found a planet containing the secret of eternal youth, interferes in the struggle between the two planetary cultures, the Yangs and the Kohms.
First aired March 8, 1968. The Enterprise is put under total control of a new type of computer, which then refuses to relinquish control.
First aired March 15, 1968. The Enterprise encounters a civilization that combines the features of the Roman Empire with 20th-century technology.
First aired March 22, 1968. Negotiations over mining rights become a battle for survival when McCoy unintentionally violates a tribal taboo.
First aired March 29, 1968. On a historical fact-finding mission to 1969, the Enterprise accidentally intercepts an interplanetary agent out to sabotage an orbiting nuclear platform.
Kirk et al. find themselves on the losing side of the gunfight at the OK Corral.
The Enterprise's task of transporting an imperious woman to another planet for marriage is complicated by Kirk's falling in love with her.
In a state of amnesia, Kirk marries and finds happiness with Miramanee, an Indian maiden. Meanwhile, Spock must find a way to save her planet from an impending meteor collision.
Kirk goes mad and Spock turns traitor in an attempt to steal an improved cloaking device from the Romulans.
A group of children, under alien domination, play on the crew members' secret fears in order to gain control of the ship.
A mysterious woman surgically removes Spock's brain.
Miranda, a telepath, is jealous of Spock's greater abilities in forming a mind-link with Kollos, an alien so ugly that the very sight of him can drive a man insane.
Kirk, Spock, and McCoy are manipulated by aliens who use them to teach compassion to a girl capable of absorbing the pain and injuries of others.
The Tholians entrap the Enterprise, not believing that the crew is merely trying to save Kirk from a hyperspace warp.
McCoy, suffering from a fatal disease, finds himself romantically entangled with the priestess governing a planetoid/spaceship on a collision course with another planet.
Klingons and the Enterprise crew must unite to overcome an alien who feeds on the hatred between them.
The dwarf Alexander's lack of mind-over-matter abilities may be the only clue to aid Kirk in defeating a band of telekinetics.
The Enterprise is invaded by beings who move too fast for human eyes to detect.
A mysterious woman whose touch is death threatens the landing party.
Two two-toned beings try to get Kirk to take sides in their racial disputes.
Captain Garth, having taken over the penal planet where he was being treated, uses his ability to change shape in an attempt to get aboard the Enterprise.
Kirk is decoyed into a replica of the Enterprise. While Spock searches for him through a maze of diplomatic red tape, the people of Gideon are using him as a source of alien infection.
An electrical cloud formed by the life-essences of the long-dead Zetarians seeks to possess the body of Scotty's new-found sweetheart.
Kirk's attempt to pick up a shipment of a vital mineral embroils him in the demands of the oppressed miners against the rulers.
A group of space hippies are searching for the legendary planet of Eden.
Flint, an immortal, uses Kirk to rouse emotions in an android, so that she will become fully human and can be a suitable, immortal mate.
Lincoln of Earth and Surak of Vulcan join Kirk and Spock in battle against a group of villains, while alien observers examine the distinctions between good and evil.
A rescue mission to a planet whose sun is about to nova results in Kirk, Spock, and McCoy being sent to various eras in the planet's past.
A woman bitterly jealous of Kirk uses an alien device to exchange her consciousness with his, and then attempts to kill her body and thus Kirk's mind.
|½||The best part is the opening credits.|
|*||Poor, scientifically-unsound plot, with mediocre acting.|
|*½||Mediocre plot and acting, scientifically sound but highly implausible.|
|**||Average Star Trek, typical acting, not especially intriguing.|
|**½||A two-star show with some novel twist added.|
|***||A minimal "entertaining" episode.|
|***½||Fair, scientifically-sound plot, good acting. Usually has at least one outstanding scene.|
|****||Good plot, damned good acting, no major flaws. To see such an episode, a hard-core Trekkie would be willing to miss a midterm in a non-departmental course.|
|****½||Excellent, well-developed plot, unparalleled acting. Only flaw is in falling slightly short of full development of the theme, or containing a minor error important to the plot. A Trekkie would be willing to miss any midterm to see it.|
|*****||To see a 5-star episode, a Trekkie would be willing to skip a final, to suffer the slings and arrows of outrageous fortune, to cross into the Romulan Neutral Zone, to boldly go where no man has gone before.|
|The various classifications of the Star System were assigned between stardates 1974.3 and 1975.5 by a general consensus among members of the Bridge Crew, the regular Trek-watchers of Stevenson Hall, at Princeton University.|
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