The Man Who Conquered Sound!
While returning to Earth from another mission in space, Hal flies over Europe and recalls that Pieface is missing a stamp from the kingdom of Modora, a small country in the Balkans. Going there to collect that stamp as a surprise for Pieface, Green Lantern learns that since people don't send mail out of the country stamps are very rare. Probing the mind of a clock maker, he learns of a Modorian named Bito Wladon, an inventor who has traveled to America, whom the clockmaker worries is up to no good.
Returning home, Green Lantern consults his ring to tell him about Wladon: Bito Wladon is a brilliant inventor who specializes in sound and has a hatred for larger countries, the United States in particular and had decided to become a criminal to boost awareness of his home land of Modora by committing fantastic crimes in America.