Notable Examples
The classic treatment was The War of the Worlds by H. G. Wells, which was made into movies in 1953 and 2005, as well as numerous radio adaptations and a TV series. Another early version is The Germ Growers (1892), by Robert Potter. 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 back story as a satire on what some perceived as Ronald Reagan's America and the 1980s as an era of conspicuous consumption, in which the hidden aliens and human members of the elite oppress poverty-stricken humans and a shrinking middle class.
In Doctor Who, alien invasions are sometimes the centerpiece of Earth-set episodes.
The beginning of Half-Life 2 reveals an Earth that was invaded and overrun by a hostile alien empire, the Combine, via a portal. The game's protagonist later joined the human resistance effort.
The beginning half of the popular video games Halo 2 and Halo 3 deals with the defense of Earth against a genocidal alien empire, the Covenant. The protagonist of the game along with Earth's military force, the UNSC, and a group of former Covenant who rebelled, the Covenant Separatists, eventually repel the invasion and topple the Covenant.
In the A.R. Curtis short story Best an invasion is portrayed more as a refuge accident, where aggressive cast-offs fight for supremacy against local police and civilians.
Read more about this topic: Alien Invasion
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