Dimension Civil war (Multiple crossover story)

In the year 2020 where everything around the planet earth is peaceful and seems fine as people go around living their normal lives. But secretly there is someone who is gathering all the other evil figures of multiple worlds, times, and dimensions to invade earth to claim its resources and other mythical secrets that have yet to be discovered. But the earths militaries will have allies from those other worlds and dimensions who will help them against the threat of the villain's that will invade earth.
Will the earth powers succeed in stopping the evil forces or will they fail and die? Find out!