Simon Bar Sinister and Cad have reached the Moon and sent their ultimatum to General Brainley and to the world's leaders. Unless the world's leaders turn over their powers to Simon with the next few hours, he will destroy the earth with a artificially created storm from his Weather Machine. The General and the world leaders refuse to give in to Simon's demands. Seeing that they need a demonstration of his power, Simon sends a little sample. Simon's attempts to attack The Pentagon fail because Underdog is able to thwart the storms. Simon decides that he'll press every key on his weather machine to sends numerous storms to earth, destroying everyone and everything in one big storm! Not even Underdog can stop that storm!