An invasion from the center of the Earth![1]

An invasion is an incident in which someone goes somewhere that they don't belong and "invades," in other words, comes without welcome. The term is often used to describe the action of terrorists or military forces who come from other countries with the intent to create fear or even conquer a country's government. The term "Alien Invasion" refers to an invasion in which beings from outer space come to Earth with the intention of conquering it.


  1. As seen in the 1981 episode The Lava Men (1981).

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