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Admiral Cartwright replaces Harry Morrow as Commander of Starfleet. (Star Trek IV: The Voyage Home)
An alien probe, dubbed the 'Whale Probe', disables Starfleet and Klingon ships, and causes serious damage to Earth's atmosphere. It is discovered that the probe was sent to contact the species Megaptera novaeangliae or humpback whale, which had, however, been hunted to extinction in the 21st century. Admiral James T. Kirk is able to retrieve two members of the species from the year 1986, and avert further catastrophe. The probe leaves Federation space, and the disabled ships are restored. (Star Trek IV: The Voyage Home)
Due to the Whale Probe threat, Earth enters a state of emergency, a state that won't be utilized again until the Borg threat of 2366/2367. (DS9: "Homefront")
After spending three months in exile on Vulcan, James T. Kirk and his crew are put on trial for their actions during the Genesis incident. All charges but one are dismissed, and Kirk is demoted to the rank of captain in punishment for the remaining charge. (Star Trek IV: The Voyage Home)
The USS Enterprise-A is launched under the command of Captain James Tiberius Kirk. (Star Trek IV: The Voyage Home)
Butler, Kirk's dog, dies. (Star Trek Generations)
On Acamar III, the Tralesta clan is almost exterminated by their arch-enemies from the Lornak clan in the Tralesta Massacre. (TNG: "The Vengeance Factor")