The word "monster" comes from the Latin monstrum, which refers to a warning or judgement that traumatically breaks into this world from the realm of the divine. It is in this sense that British director Gareth Edward's 2010 film Monsters is well-named.
In the tradition of movies like Gojira, Edwards uses a giant monster invasion as an allegory for serious real-world dangers. This allegory stands atop an ancient mythical subtext underlying all monster stories. If the allegory deserves interpretation, the subtext demands exegesis. Monsters is both a commentary on the violence inflicted by an imperial power on an impoverished nation and a depiction of the religious horror the violence unleashes upon the world.