In the 22nd century, humanity's space development has made great progress. The moon is now habitable, and a colony on Pluto's Lagrange Point has been established as a stepping stone for further exploration of the universe. However, aliens from a far-off corner of the galaxy have other plans, invading planets and seeking to rule outer space.
The humans' Plutonian colony was invaded by the aliens, and their warship Gigantos had the colonists at its mercy. The aliens set their sights on Earth, and America's newly-formed Space Force was sent to stop them using a Hyperzone Drive-powered ship, known as Falsion.
You play as the pilot of Falsion, armed with a beam weapon and homing missiles. Your goal is to blast through six first-person levels of enemies and their leaders, while collecting red capsules to increase your missile supply and blue capsules to speed up your movement. The action becomes even more intense in 3D mode, where enemies will appear to leap out of the screen towards you.