How about...

Earth was just an obstacle in the great quest to form the intergalactic highway. The only people that knew of the impending danger was Mr. Prefet and the dolphins. But what purpose did the earth serve in the whole intergalactic business? It seems that the earth was a very elaborate computer designed to find the question to the ultimate answer, 42, but now with earth gone and only one human left, Arthur Dent, there had to be another way.

I know I'm a geek.