2266 (Columbia)
January
- Stardate 1672.1 (approx. 13 January): While beaming up from planet Alfa 117, a transporter accident splits Captain Kirk into two beings: one "good", who is weak and indecisive, and one "evil", who is overly aggressive and domineering. (TOS 04)
- Stardate 1699.0 (approx. 23 January): (TOS: B&B1, "The First Artifact")
- Stardate 1704.2 (approx. 25 January): A strange, intoxicating infection, which lowers the crew's emotional inhibitions, spreads throughout the Enterprise. As the madness spreads, the entire ship is endangered. (TOS 06)
- Stardate 1709.1/Reference Stardate 2/0710.21 (approx. 26 January): The vast buildup of Klingon military might reported by Starfleet Intelligence has diverted attention from the long-dormant Romulan Star Empire. While investigating a series of destroyed outposts, the Enterprise discovers a lone Romulan vessel with a cloaking device and a powerful new plasma torpedo. The Enterprise pursues the Romulan bird of prey into the Romulan Neutral Zone, where it picks up images from the Romulan ship's bridge. The Romulans, having never before been seen by Humans, are revealed to visually resemble Vulcans, casting doubt from some on Mr. Spock's loyalty. After taking heavy damage, the Romulan ship self-destructs. (TOS 08)
February
- Stardates 6394.55-6394.75/Reference Stardate 2/0802.11 (11 February): The U.S.S. Republic NCC-1371 investigates a crashed spacecraft on planet BWCC98-IV. The landing party is infected with neural parasites, and the Edoan science officer, Lieutenant Commander Xepesna, destroys all of the ship's astrogation records to prevent the organisms from spreading further. (FASA 2214, "Lost and Presumed Dead")
May
- Stardate 2124.5 (approx. 27 May): The U.S.S. Enterprise NCC-1701 discovers a rogue planet drifting through space, inhabited by an eccentric being named Trelane who uses his apparently unlimited power over matter and form to manipulate the crew. (TOS 18)
November
- Stardate 2534.0 (approx. 23 November): The crew of the Enterprise visits Ekos, a planet dominated by a Nazi culture and at war with its planetary neighbor, Zeon, while searching for missing Federation historian John Gill. (TOS 52)
Notes
Captain Kirk's five-year mission was established to have begun in 2265 in the Star Trek: Voyager episode "Q2". The Star Trek] episode "The Menagerie, Part I" further establishes that Spock served under Captain Pike for 11 years, and that it had been 13 years since the events of "The Cage," meaning that Stardate 3012.4 fell in either the end of the second or beginning of the third year of Kirk's command. The episode "Charlie X" further added weight to this, establishing both Stardate 1533.1 and the Earth date of Thanksgiving, which falls on 23 November in 2265. As the stardates ranged from the mid-1000s to the low 3000s in the first season and continued to increase at approximately 1000 per season afterward, it seems logical to conclude that the first season spanned nearly two years, and later seasons one each, with the second season chronicling the 3000s, the third season the 4000s, and the Animated Series the 5000s. If Captain Kirk's command began on or about Stardate 1000, this would put the end of the five year mission on or about Stardate 6000, shortly after the end of the Animated Series. Using these dates as a reference point, the following can be established:
- Stardate 1000 fell on 13 May 2265.
- The range for Stardates each year is from X636 to Y635 (e.g., 1636 to 2635)
- This places "The Menagerie" (Stardate 3012.4) on 18 May 2267, at the beginning of Kirk's second year in command of the Enterprise
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