The Negative Zone is a universe parallel to Earth's. The two have many similarities, but a few noteworthy differences include: all matter in the Negative Zone is negatively charged; the Negative Zone is entirely filled with a pressurized, breathable atmosphere; and near the center of the Negative Zone is a deadly vortex of unspeakable power. Since the Negative Zone is largely uninhabited, several would-be conquerors have attempted to bridge the gap to Earth and take over its population.