Invasion
For the series of novels, see Star Trek: Invasion! For the PlayStation game, see Star Trek: Invasion

An invasion is an action undertaken by one government where its military entered the territory of another government for the purpose of controlling such territory or the people there.

According to Sub-commander T'Pol, Andorians believed Vulcans tend to mount an invasion of their homeworld. ()

Captain Jonathan Archer suggested that an invasion by the Borg was postponed until the 24th century following the subspace message they sent into the Delta Quadrant in 2153. () 

In the 23rd century, the Code Factor 1 designation on a message indicated that it concerned an invasion of the United Federation of Planets. Commodore Barstow issued such a message in 2267. ()

In 2366, the Borg launched an invasion of Earth. They assimilated Captain Picard into the collective and he became Locutus of Borg, forcing him to help them destroy the 39 starships sent to intercept the Borg, by using his knowledge about Starfleet at the Battle of Wolf 359. The crew of the  was able to use Locutus' connection to the Borg to defeat the invading Borg cube. ()

After the Antwerp Conference bombing of 2372 and fluctuations of the Bajoran wormhole indicating a possible Dominion invasion, Admiral Leyton and Captain Sisko convinced the President of the United Federation of Planets Jaresh-Inyo to declare a state of emergency. The incident turned out to be staged by Leyton to attempt a coup d'état'' of the Federation. This was exposed by Sisko, forcing Leyton to resign his commission. () 

In 2373, the Borg again attempted to invade Earth by traveling back to April 4, 2063 to prevent First Contact by assimilating a post-World War III Earth. They were defeated by the crew of the . ()

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