Prime Chronology: 2266

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  • Stardate 2712.4 (approx. 23 June): In search of Nurse Chapel's fiancé, renowned exobiologist Roger Korby, the Enterprise visits the icy planet Exo III, where Korby has discovered an ancient machine which allows him to duplicate any living person with an android replacement. Korby plans to use the machine to spread controlled androids throughout the Federation, and replaces Captain Kirk with such a duplicate in an effort to take over the Enterprise. (TOS 09)
  • Stardate 2713.5 (approx. 23 June): After discovering what appears to be a duplicate of the planet Earth, Captain Kirk and his landing party find a population ravaged by a strange disease, which only children appear to have survived. (TOS [Miri (Episode)|11]])
  • Stardate 2715.1 (approx. 23 June): While on a re-supply mission to a rehabilitation colony for the criminally insane, the Enterprise crew discovers that the chief doctor has been using a device which destroys the human mind. Captain Kirk and Dr. Helen Noel, down on the planet, must deal with the problem up close and personal. (TOS 10)


  • Stardate 2817.6 (approx.11 July): While visiting an old friend, Kirk suspects a Shakespearean actor may actually be the murderous former governor of Tarsus IV. Kirk invites the acting troupe aboard the Enterprise in order to investigate, but soon assassination attempts are made on Kirk and another crewman who were eyewitnesses to the murders. (TOS 12)
  • Stardate 2821.5 (approx. 12 July): Spock and a scientific party are sent to study the Murasaki 312 quasar aboard the shuttlecraft Galileo. During the survey, the Galileo is forced to make an emergency landing on the planet Taurus II, where the crew fights the planet's dangerous inhabitants. As the crew begins to make repairs, Scotty determines that the shuttle does not have enough fuel to reach orbit carrying all seven passengers, and Spock must contemplate leaving some of his fellow crew behind. (TOS 13)


  • Stardate 2947.3 (approx. 3 August): Captain Kirk is placed on trial for negligence after a crewman is killed during a severe ion storm. Kirk maintains that his actions were proper and should not have led to the officer's death, but the evidence seems strong against him. (TOS 14: "Court Martial")
Christopher Pike (TOS 16)
  • Stardate 3012.4 (approx. 15 August): Spock hijacks the Enterprise to take his crippled former captain, Christopher Pike, to the forbidden world of Talos IV. He then demands a court martial, which he uses to tell the tale of Pike's captivity on the planet years earlier. After witnessing the Talosians' capabilities of mental illusion, Captain Kirk realizes that Spock intends to return Pike to the planet to live a life of illusion, unencumbered by his crippled condition. (TOS 15-16)
  • Stardate 3018.2 (approx. 16 August): Two powerful aliens threaten the well-being of the Enterprise and her crew with their apparently magical powers. (TOS 30)
  • Stardate 3025.3 (approx. 17 August): Captain Kirk orders shore leave for the Enterprise crew on a seemingly uninhabited planet in the Omicron Delta system. The landing parties begin to see strange sights, such as a White Rabbit a la Alice in Wonderland, Don Juan, and a sword-wielding samurai. Also, Kirk sees (and fights) an image of Finnegan, a rival from his Starfleet Academy days. Spock discovers that the planet seems to be drawing a large amount of energy from the ship's engines, placing the Enterprise in danger. (TOS 17)
Gorn captain (TOS 19)
  • Stardate 3045.6 (approx. 20 August): The Enterprise comes under attack by unknown aliens while investigating the near destruction of the Cestus III colony. While chasing the aliens into unexplored space, both ships are captured by the powerful Metrons, who force Kirk and the Gorn captain to trial by combat: the winner's vessel will be set free, while the loser's ship will be destroyed. (TOS 19)
  • Stardate 3087.6 (approx. 28 August): While orbiting an apparently dead planet, the Enterprise seems to experience a strange moment of "nonexistence". Captain Kirk discovers a man named Lazarus on the planet below, who claims the effect was caused by his "enemy", later revealed to be an insane version of Lazarus from an alternate dimension. The sane version of Lazarus asks for Kirk's help in defeating his counterpart. (TOS 20)


  • Stardate 3113.2 (approx. 1 September): After accidentally traveling back in time to 1969, the Enterprise rescues U.S. Air Force Captain John Christopher from his crippled fighter jet. The crew struggles to return to their own time, while simultaneously returning Christopher to his, removing his knowledge of the future and all record of contact with the Enterprise. (TOS 21)
  • Stardate 3134.0 (approx. 5 September): After accidentally overdosing on a powerful stimulant, Dr. McCoy becomes unbalanced and disappears through the Guardian of Forever, a newly discovered time portal on a remote planet. Kirk and Spock follow after learning that McCoy somehow changed history. Arriving in the 1930s, the duo meet Edith Keeler, a New York social worker who gives them a place to stay. As the days pass, and McCoy is nowhere to be seen, Kirk finds himself falling in love with Keeler... but Spock discovers that Keeler must die to restore the timeline. (TOS 28)
Khan (TOS 24)
  • Stardate 3141.9 (approx. 6 September): The Enterprise discovers an ancient sleeper ship, the S.S. Botany Bay, which escaped from Earth's Eugenics Wars in the late 20th century. The genetically engineered passengers, led by Khan Noonien Singh, attempt to seize control of the Enterprise. Khan and his followers—including Lieutenant Marla McGivers, the Enterprise's historian, who colluded with Khan in his attempt to seize the ship—are left to colonize Ceti Alpha V, in lieu of court martial or formal rehabilitation. (TOS 24)
  • Stardate 3156.2 (approx. 9 September): The Enterprise discovers a population on planet Beta III that is controlled by a powerful being called Landru. While investigating, Captain Kirk and his landing party are taken captive and discover that the Enterprise crew will be the next to be "absorbed" into Landru's control. (TOS 22)
  • Stardate 3192.1 (approx. 15 September): On Eminiar VII, the Enterprise finds a civilization at war with its planetary neighbor, Vendikar. Unable to discern any signs of battle from orbit, Captain Kirk and Ambassador Robert Fox lead a landing party to the surface where he discovers the entire war is fought by computer. Even though the war is simulated, citizens who are listed as virtual casualties still report to termination booths to be killed in reality. After the Enterprise is "destroyed" in an attack simulation, Kirk must fight to keep his crew from death. (TOS 23)
  • Stardate 3196.1 (approx. 16 September): Dispatched to the mining colony on Janus VI, the Enterprise is tasked to investigate rumors of a strange, subterranean creature responsible for destruction of equipment and the deaths of fifty miners. Kirk and Spock discover a silicon-based life form, a Horta, which lives in the surrounding rock. After Kirk and his Vulcan first officer find the strange creature, Spock performs a mind meld, discovering the reason behind the Horta's attacks. (TOS 26)
  • Stardate 3198.4 (approx. 16 September): When representatives from the United Federation of Planets and the Klingon Empire fail to reach a peaceful resolution to their differences, Klingon warships invade Federation space. The Enterprise is ordered to protect Organia, a peaceful planet located near the Klingon border. Captain Kirk and Commander Spock beam to the surface to warn the Organians about the Klingons, but soon thereafter, a Klingon battle group led by Commander Kor seizes the planet, forcing the Enterprise to abandon the Kirk and Spock on the planet. The natives protect the two, even as Kor orders mass executions of the Organian people. As both Federation and Klingon fleets converge above the planet, Kirk and Spock execute a daring raid on the Klingon headquarters in an effort to destabilize their control over the planet. The Organians suddenly intervene, immobilizing all Federation and Klingon ships throughout the galaxy. They impose the Organian Peace Treaty, thus averting another war between the two powers. (TOS 27)
  • Stardate 3211.7 (approx. 19 September): Captain Kirk, Chekov and Uhura are kidnapped by powerful disembodied aliens and forced to fight in gladiatorial contests for the aliens' gambling entertainment. (TOS 46)
  • Stardate 3219.4 (approx. 20 September): A shuttle crew from the Enterprise encounters a castaway who appears to be Zefram Cochrane, the inventor of warp drive and his mysterious alien companion. (TOS 31)


  • Stardate 3287.2 (approx. 2 October): The Enterprise arrives at Deneva—the home of Captain Kirk's brother, Sam and his family—and discovers that the entire planet has been infested with large, amoeba-like aliens that have attacked and killed much of the Human population. One of these aliens attaches itself to Spock, who volunteers to become a subject in Dr. McCoy's medical tests. McCoy and Kirk rush to find a cure in time to save Spock and the remainder of the Denevan population. (TOS 29)
  • Stardate 3372.3 (approx. 17 October): An energy-based life form that feeds on negative emotions drives the crew of the Enterprise into brutal conflict with the Klingons. (TOS 66)
  • Stardate 3372.7 (approx. 17 October): When Mr. Spock begins to behave aggressively, Kirk discovers his first officer must return to Vulcan to take a mate, or he will die. (TOS 34)
  • Stardate 3417.3 (approx. 25 October): Despite exposure to fatal radiation, the Federation colony on Omicron Ceti III appears to be thriving. A landing party from the Enterprise investigates, finding the colony's population to be healthy beyond explanation. Leila Kalomi, an old friend of Mr. Spock, shows the landing party strange flowers that seem to impose a state of pure bliss on all exposed to its spores, but at the cost of ambition and self-discipline. (TOS 25)


  • Stardate 3468.1 (approx. 3 November): The crew of the Enterprise are held captive by an alien who claims to be the Greek god Apollo. (TOS 33)
  • Stardate 3478.2 (approx. 4 November): Strange radiation exposes a landing party from the Enterprise to the effects of rapid aging. (TOS 40)
  • Stardate 3497.2 (approx. 8 November): The crew of the Enterprise becomes entangled in a planet's tribal power struggle. (TOS 32)
  • Stardate 3541.9 (approx. 15 November): The crew of the Enterprise deals with Nomad—an indestructible, planet-destroying space probe that thinks Kirk is its creator. (TOS 37)
  • Stardate 3614.9 (approx. 28 November): Mr. Scott is implicated in a series of bizarre murders. (TOS 36)
  • Stardate 3619.2 (approx. 29 November): Captain Kirk becomes obsessed with destroying an entity that killed many of the crew of his old ship. (TOS 47)


  • Stardate 3715.3 (approx. 16 December): The crew of the Enterprise visits a mysterious and deadly paradise planet which they discover is controlled by a machine called Vaal. (TOS 38)


Using the stardate given in "Charlie X" (1533.1), coupled with the calendar date given in that episode ("Thanksgiving," which falls on 23 November in 2265), a range of stardates for 2266 was devised: 1718-3796, which results in 5.7 stardates per 24 hours. Using this range as a guide, the following ranges were calculated per month for 2266:

  • January: 1718-1894
  • February: 1895-2050
  • March: 2051-2227
  • April: 2228-2398
  • May: 2399-2575
  • June: 2576-2746
  • July: 2747-2923
  • August: 2924-3100
  • September: 3101-3271
  • October: 3272-3448
  • November: 3449-3619
  • December: 3620-3796

These date ranges are, of course, approximate; calendar dates on other entries have been calculated based upon these ranges, except where explicitly given in the original story.

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