Alien Invasion Science Fiction
What is Alien Invasion Science Fiction?
A straightforward title for this sub-genre that is about aliens invading Earth (usually). This is a classic sub-genre of Sci Fi in which most stories (not all) show humans triumphing over the alien invaders eventually. Aliens invade for varying reasons, but usually the invasion is an attempt to gain resources, enslave humans, or very simply to kill all humans. The aliens invading Earth scenario is often a way to comment on military hegemony or contemporary social ills. Alien invasion itself may be the guns blazing type or the infiltration type.
Alien Invasion in Science Fiction can be a First Contact scenario or can be more invidious, a hidden infiltration covered up by governments (Alien Conspiracy) who might secretly be at war or at least trying to capture alien technology.
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Level of Real Science
High/Mystery. Aliens tend to invade Earth once it has reached a technological threshold—humans can build nuclear weapons and warp drives (or faster-than-light transportation). So, human technology is well thought out and understandable to the reader. Alien technology is often left a mystery though. In fact, humans trying to figure out alien technology is frequently a key plot point in Alien Invasion story plots.
Level of Grand Ideas/Social ImplicationsHigh. Alien Invasions are rarely straight forward action stories. Usually, the invasion is used as a vehicle for commenting on other social issues like the military, government control, occupation, and what it means to be human.
Level of Characterization
High. An Alien Invasion means there must be heroes! A good hero has motivations, emotions, and a certain drive—all things that make a well groomed character.
Level of Plot Complexity
High. Plot is well developed in Alien Invasion Sci Fi. These stories tend to be action driven and so the plot is well developed.
Level of Violence
Yes. Violence is fairly prominent—it's an alien invasion after all.
Apocalypse—alien apocalypse to be exact. Sometimes the Earth and its inhabitants don't fare so well against alien invaders and the resulting story is about the aftermath of an apocalypse.
Alien Conspiracy. For obvious reasons
Comic Science Fiction—because the alien invasion trope has been floating around the Sci Fi community for so long it now unfolds in comedic Sci Fi stories and parodies.
You don't like stories depicting the strength of the human spirit. If you are scared of aliens and are gullible like the listener's of a certain famous 1938 radio show. Or if you like stories where the phrase 'we come in peace' is uttered.