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, or in some cases, to use humans as food or fuel.
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SF Sub-Genre Definitions
RandomAre you a budding sci-fi author? Do you need the many different sub genres of SF defined? A lot of people do so if you're one of them... this is where you need to look!
