This second book in the series centers on an attack from another universe led by an alien who had slipped into our universe eons before and had created havoc. He had been deported, supposedly back to his own universe but had been dumped into a different one by mistake. He has been plotting his revenge ever since.
Our aliens have developed a space fighter to end all wars but found that only humans can utilize it to the full.
Silly Alien Space War Stories for Bigger Kids is a story of how one man saved the universe and returned to tell the tale.