Canontypicalgore Stories

*This is a Challenge fic/story, not an actual story.* Humanity was always curious about the unknown. It's why they launched expeditions into space and explored the depths of the ocean. It was curiosity and a thirst for knowledge that lead these actions. They wanted to know if they were alone on Earth or in the galaxy - was there life beyond them? Or where they truly alone in this vast universe? The answer to that question came one day, but with it came disaster. Monsters from other worlds. Can Humanity survive these beast? Or is the apocalypse neigh? *Further challenge details as well as an optional summary for use will be contained inside.*