As a scientist, he had invented a shrink ray, and that would become the basis of his plan. He tested his shrink ray; the Sonic Microwave Reducer, which he used to shrink everyone at the United States Space Center, as well as an airplane pilot. At this point, it was clear that his machine was capable of shrinking anyone down to two-inches in height.
After shrinking and kidnapping the Justice League, he steals the Vanderbulge Star Sapphire, a rare sapphire; and reportedly the largest in the world, he used it to power his new shrinking machine. This time, his machine transmitted its' signal through television and radio broadcasts, causing virtually everyone on Earth to be shrunken.
After Green Arrow entered the case, he rescued the captured and shrunken Superfriends, he himself now a tiny man as well. He fashioned himself a small quiver and bow and arrow, and assaulted Gulliver's Castle. The man is defeated, and his plan foiled.