If another world attacked us , it would be the end of the Earth for sure as we barely get to the moon and these Aliens can cross Universes so we wouldn't stand a chance against their weaponry
We'd all rally behind Bill Pullman who would be elected President of Earth and we'd really sock it to 'em. They might be technologically advanced but they ain't never run up against anything like a whole passel of snarky humans.
But, of course, Bill has already done the job, as everybody knows: