Aliens existed already. They are called humans.
They are illegal aliens on earth, and are proven to be hostile to anything, each other, other species and even mother earth herself.
So far they have done absolutely nothing to the well-being of this planet and are better off wiped out.
Oh the horrors! I don't know what to do when I encounter this alien species.
They are illegal aliens on earth, and are proven to be hostile to anything, each other, other species and even mother earth herself.
So far they have done absolutely nothing to the well-being of this planet and are better off wiped out.
Oh the horrors! I don't know what to do when I encounter this alien species.