- According to a speech given by John Gill, the Zeon colony on Ekos was established shortly after this year. A half a century later, this colony is wiped out virtually overnight by a genocide purge ordered by Gill who was then under the influence of his deputy Melakon. (TOS: "Patterns of Force")
- According to the Star Trek Chronology (? ed., p. ?) and the Star Trek Encyclopedia (2nd ed., p. 690), 2218 was the year in which the Federation made "first contact with the Klingon Empire. The incident is a disaster, leading to nearly a century of hostilities between the Klingons and the Federation." The date is apparently supported by a line of dialogue written for Doctor McCoy in the first draft of the script for Star Trek: The Original Series episode "Day of the Dove" – when Kang was still written as Kor. According to McCoy's line, which did not explicitly state "first contact", he stated: "Fifty years-- Eyeball to eyeball with the Klingon Empire." The lines were rearranged and rewritten with the equivalent line changed to state: "The Klingons claim to have honored the truce..." A similar statement, noted in the entry at 2223, was given by Spock in Star Trek VI: The Undiscovered Country, however, both instances were later disproved in the Star Trek: Enterprise premiere "Broken Bow".
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