The galaxy is in danger. An alien threat, robot in tow, wants to take over the technology that serves to safeguard interstellar balance and peace. Divided into 3 planets, Fungal, Pluvius, Darkon, this technology is protected inside Commodore containers. Omega, our hero, will fight against the enemies of humanity. A prowess galactic defender, he has the Commodore at his side, who will support him and help him in his battles. His weapons are the blaster armed with quantum energy bullets and the Commodore Engine, a miraculous space suit enhancement system that, thanks to the energy of the galactic crystals, will give him the power necessary to transform itself from Omega to Astro, and from Astro to Ultra, thus becoming stronger and stronger. His appearance will undergo changes, but his fearless heart will always beat for the sake of the galaxy. The game unfolds over 15 levels, five for each planet. Omega will continually clash with enemy robots by engaging in a massive battle against three very strong Bosses, on whose defeat will depend the progress of its mission and the future of all the planets threatened by the looming alien invasion.