Star Trek (1966–1969) 
Captain James T. Kirk and the crew of the Starship Enterprise explore the Galaxy and defend the United Federation of Planets.
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Star Trek: Operation: Annihilate! Rewatch Season 1, Episode 30
The Enterprise crew attempts to exterminate a plague of amoeba-like creatures from possessing human hosts at a federation colony. The crew must stop the creatures from spreading throughout the galaxy. This is the final episode of Season 1. [more inside]
Star Trek: The City on the Edge of Forever Rewatch Season 1, Episode 29
The crew of the Enterprise finds itself exploring a "temporal disturbance" near an unknown planet. After accidentally injecting himself with "super adrenaline" McCoy loses his mind and beams to the planet where he finds a portal in time. Kirk and Spock must travel into the past in order to prevent a deranged McCoy from altering history... and eradicating their own past. [more inside]
Star Trek: The Alternative Factor Rewatch Season 1, Episode 28
While investigating and scanning an uncharted planet, the Enterprise and its quadrant of space are subjected to a violent force that seems to cause a 'blinking out' of everything near them. The crew goes to the planet's surface and encounters Lazarus, a reality jumping madman. [more inside]
Star Trek: Errand of Mercy Rewatch Season 1, Episode 27
Kirk and Spock beam down to the surface of planet Organia to negotiate for the erection of a Federation base. Hostilities between the nearby Klingon Empire and the Federation have reached alarming heights and it is feared that the medieval culture of the Organians will not be able to withstand a Klingon attack. However, the Organian Council, comprised of five seemingly pleasant, benign elderly men, insist that they prefer to stay with their more primitive culture. [more inside]
Star Trek: The Devil in the Dark Rewatch Season 1, Episode 26
The Enterprise is called to a mining planet, where the personnel are being killed by an invisible creature. Said creature turns out to have a point of view too; she is 'the Horta' the mother of her race and the human miners have been carelessly destroying her eggs - thinking they are nothing but a curious mineral formation. [more inside]
Star Trek: This Side of Paradise Rewatch Season 1, Episode 25
The Enterprise crew is trapped in paradise when they come to rescue colonists who have fallen to pacifying alien spores and become infected themselves. [more inside]
Star Trek: A Taste of Armageddon Rewatch Season 1, Episode 24
The crew of the USS Enterprise visits a planet whose people fight a computer-simulated war against a neighboring planet. Although the war is fought via computer simulation, the citizens of each planet have to submit to real executions inside "disintegration booths" to meet the casualty counts of the simulated attacks. The crew of the Enterprise is caught in the middle and are told to submit themselves voluntarily for execution after being "killed" in an "enemy attack". [more inside]
Star Trek: Space Seed Rewatch Season 1, Episode 23
Captain Kirk and his crew find and inadvertently revive a genetically augmented world conqueror (Ricardo Montalbán as KHAN!!!!) and his compatriots from Earth's 20th century. [more inside]
Star Trek: The Return of the Archons Rewatch Season 1, Episode 22
The Enterprise travels to Beta III to learn the fate of the U.S.S. Archon, gone missing a century earlier. One member of the landing party disappears, and one returns in a strangely blissful state. Kirk beams down with another landing party; amidst the chaos of "Festival" their hosts asks if they are "Archons." To learn more, Kirk must convince Betan citizens to disobey Landru, the man who has ruled them for 6,000 years - or find those who already resist. But with the Lawgivers everywhere, that task is going to be difficult... [more inside]
Star Trek: Court Martial Rewatch Season 1, Episode 21
Captain Kirk's career is at stake when he is put on trial for the loss of a crewman during an ion storm. [more inside]
Star Trek: Tomorrow is Yesterday Rewatch Season 1, Episode 20
The Enterprise narrowly avoids a collision with a black hole and is thrown back to Earth in the 20th century, where they must find a way back and erase any trace of their presence. Matters become complicated when they rescue an Air Force pilot and cannot return him without changing history...but if he disappears that will change history as well. [more inside]
Star Trek: Arena Rewatch Season 1, Episode 19
For bringing hostility into their solar system, a superior alien race pits Captain Kirk in single combat against the murderous reptilian captain of an alien ship he was pursuing. [more inside]
Star Trek: The Squire of Gothos Rewatch Season 1, Episode 18
On stardate 2124.5, the USS Enterprise is snagged by an unknown force near a barren planet, and Sulu and the captain are kidnapped. Upon beaming down to search for them, the landing party finds itself the unwilling guests of the quirky Trelane (William Campbell), a strange lifeform with unusual powers and particular tastes for being amused. [more inside]
Star Trek: The Galileo Seven Rewatch Season 1, Episode 17
The Galileo, under Spock's command, crash-lands on a hostile planet. As the Enterprise races against time to find the shuttlecraft, Spock's strictly logical leadership clashes with the fear and resentment of his crew. [more inside]
Star Trek: Shore Leave Rewatch Season 1, Episode 16
The USS Enterprise has been through a grueling three months, when they discover a lush planet in the Omicron Delta region that promises the kind of shore leave they desperately need. The crew encounter strange illusions and discover a caretaker who explains that the planet is a playground where the crew's imagination can become reality. [more inside]
Star Trek: Balance of Terror Rewatch Season 1, Episode 15
The Enterprise must decide on its response when a Romulan ship sends an armed probe into Federation territory. The Romulans, using their cloaking capabilities, force the Enterprise into neutral territory to stop the threat. [more inside]
Star Trek: The Conscience of the King Rewatch Season 1, Episode 14
While Captain Kirk investigates whether an actor is actually a presumed dead mass murderer, a mysterious assailant is killing the people who could identify the fugitive. [more inside]
Star Trek: The Menagerie Part 2 Rewatch Season 1, Episode 13
At Spock's court martial, he defends himself with mysterious footage which retells an ailing Capt. Pike's kidnapping by powerful illusion casting aliens thirteen years prior. [more inside]
Star Trek: The Menagerie Part 1 Rewatch Season 1, Episode 12
While visiting Starbase 11, the Enterprise is hijacked by Mr. Spock, leaving Captain Kirk behind while abducting the recently crippled Captain Christopher Pike, former commander of the Enterprise. [more inside]
Star Trek: The Corbomite Maneuver Rewatch Season 1, Episode 11
Traveling into uncharted space, the Enterprise encounters a mysterious alien probe. When the probe poses a threat, Kirk is forced to destroy it, much to the ire of the apparently superior alien race that created it. The alien commander, Balok, subsequently sentences the Enterprise to destruction for trespassing in their space. [more inside]
Star Trek: Dagger of the Mind Rewatch Season 1, Episode 10
While on a routine cargo drop to the Tantalus Penal Colony, Kirk and psychiatrist Helen Noel are trapped on a maximum security penal colony that experiments with mind control and Spock must use the Vulcan mind-meld to find a way to save them. [more inside]
Star Trek: Miri Rewatch Season 1, Episode 9
The Enterprise discovers an exact duplicate of Earth, where the only survivors of a deadly man-made plague are some of the planet's impossibly old children. [more inside]
Star Trek: What Are Little Girls Made of? Rewatch Season 1, Episode 8
While searching planet EXO-III to learn the fate of Dr. Roger Korby after his last communication 5 years prior, the Enterprise finally receives a transmission from Korby and Nurse Chapel is ecstatic that her fiancé has been found. [more inside]
Star Trek: Mudd's Women Rewatch Season 1, Episode 7
The Enterprise is damaged chasing down a cargo ship and the crew picks up untrustworthy entrepreneur Harry Mudd accompanied by three beautiful women. In order to repair the damage, the crew desperately needs to find "lithium" crystals but are hindered by the beauty of the women. [more inside]
Star Trek: The Enemy Within Rewatch Season 1, Episode 6
The Enterprise investigates planet Alpha 177 and while a crewman returns a problem with the transporter is discovered. Captain Kirk is then beamed back and subsequently split into two psyche's which the crew must recognize and ultimately resolve. [more inside]
Star Trek: The Naked Time Rewatch Season 1, Episode 5
The Enterprise investigates planet psi 2000 to relocate a science team from a dying planet. After finding the team has been killed, Lt. Joe Tormelon brings back a mysterious infection that removes people's emotional inhibitions. The crew of the Enterprise soon find themselves unable to control their most pre-dominant emotions. Soon the entire starship is in a shambles and plummeting toward the self destructing planet. [more inside]
Star Trek: Where No Man Has Gone Before Rewatch Season 1, Episode 4
When the Enterprise attempts to penetrate a space barrier, it is damaged and creates a potentially worse problem. Two crew members, including Kirk's best friend, gain psionic powers that are growing at an exponential rate. That leaves Captain Kirk with the difficult choice of either marooning them or killing before they get so powerful that they lose their humanity and become truly dangerous. [more inside]
Star Trek: Charlie X Rewatch Season 1, Episode 3
Captain Kirk must learn the limits of a 17-year-old boy with the psychic ability to create anything and destroy anyone. [more inside]
Star Trek: The Man Trap Rewatch Season 1, Episode 2
The starship Enterprise arrives at planet M-113 for routine medical exams of archaeologist Professor Robert Crater and his wife Nancy. [more inside]
Star Trek: The Cage Rewatch Season 1, Episode 1
Capt. Pike is held prisoner and tested by aliens who have the power to project incredibly lifelike illusions. [more inside]