Seeing that Simon can destroy the earth by using all of the artificially created storms at once, General Brainley convinces the leaders of the world that they have no choice but to surrender to Simon. But Underdog will not allow this villain to get away with his mad scheme. He takes his super energy pill and then he spins around at top speed until he becomes invisible and flies right to the moon. Once there, he confuses Simon and Cad, and they start fighting. They end up knocking each other unconscious. Underdog frees Polly, destroys the weather machine and returns Polly, the spaceship and the two villains to earth.