Memes

I want to make a short film / animation where aliens are approaching earth, the only thing we know about the aliens is that they plan to destroy all life and replace it with their own twisted creation. A few minutes of typical story follows, heroes assemble, go to fight, etc. The heroes lose and the ending scene shows that the aliens have succeeded and replaced all the diverse life on Earth with a perfectly manicured lawn that covers the entire planet. A biological wasteland.