Earth's conventional space fleet has been crushed; the planet must use its most secret weapon, the Bari-Arm. The Bari-Arm is a living, fighting machine. It must protect Earth from the androids of planet Zias who are trying to destroy the blue planet. You can upgrade your arsenal to get advanced firepower from the Thundercracker, Burning Wave, or Chase Cannon. You must try and kill off all the bosses, as you travel through amazing moonscapes and fighting sequences.