The alien invasion is a common theme in science fiction stories and film, in which a technologically-superior extraterrestrial society invades Earth with the intent to replace human life, or to enslave it under a colonial system. The invasion scenario has been used as an allegory for a protest against military hegemony and the societal ills of the time. Wells' The War of the Worlds is often viewed as an indictment of European colonialism and its "gunboat diplomacy" —setting a common theme for future alien invasion stories, that force audiences in modern societies (U.S., UK) to em ...

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The most well-known alien invasion scenarios involve the aliens landing on Earth, destroying or abducting people, fighting and defeating Earth's military forces, and then destroying Earth's major cities. Usually the bulk of the story follows the battles between the invaders and Earth's armies, as in The War of the Worlds. However, not all alien invasion stories follow this plot. In some accounts, the alien invaders will covertly subvert human society using disguises, shapechanging, or human allies. In other depictions, the aliens scor ...

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Alien invasion, Alien invasion - Variations, Alien invasion - Notable examples, Alien invasion - External link

Read more here: » Alien invasion: Encyclopedia II - Alien invasion - Variations

The classic treatment was The War of the Worlds by H.G. Wells. Other treatments have posited biological invasions (Invasion of the Body Snatchers), or cultural invasion (The Uplift Wars by David Brin). The 1988 cult film They Live uses its own alien infiltration backstory as a satire on what some perceived as Reagan's America and the 1980s as an era of conspicuous consumption, in which the hidden aliens and human members of the elite oppress po ...

See also:

Alien invasion, Alien invasion - Variations, Alien invasion - Notable examples, Alien invasion - External link

Read more here: » Alien invasion: Encyclopedia II - Alien invasion - Notable examples